An adjustable paper pressing and positioning mechanism for a printed product hot stamping machine

Abstract

An adjustable paper pressing and positioning mechanism for a hot stamping machine for printed materials includes an electric linear slide, a vacuum suction cup, a solenoid valve, a vacuum pump, a power module, a power switch, a PLC, an electric push rod, and also has a control circuit and a limit mechanism; the lower end of the support frame of the electric pressure plate of the hot stamping machine and the lower end of the electric push rod are respectively installed on the two sliding blocks of the electric linear slide, and the upper end of the movable rod of the electric push rod is installed with an air pipe, which is connected to the air intake pipe of the vacuum pump in series through the first solenoid valve, and one end of the second solenoid valve is connected in parallel with the side end of the air pipe; each set of limit mechanisms includes an electric push rod A, a force-sensitive resistor, a movable plate, and a guide shell installed together, and multiple sets of limit mechanisms are installed inside the hot stamping machine bearing plate, and the power module, the power switch, the PLC, the control circuit, and the limit mechanism are installed in the electric control box and electrically connected. The present invention brings convenience to the staff, improves work efficiency, and ensures the hot stamping effect. The present invention has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary equipment for hot stamping machines, in particular to an adjustable paper pressing and positioning mechanism for hot stamping machines for printed products. Background Art

[0002] The hot stamping machine is a special printing equipment that does not use ink. When working, it stamps the electrochemical aluminum foil onto the surface of the substrate (such as thicker paper such as calendar covers) at a certain temperature and pressure, which enhances the artistry of the printed product and plays a role in highlighting the theme of publicity; its brightness is much higher than that of gold and silver printing, making the product feel high-end and giving people a beautiful enjoyment. At the same time, because the electrochemical aluminum has excellent physical and chemical properties, it plays a role in protecting the printed product. The hot stamping process is widely used in high-end and exquisite packaging and decoration trademarks, calendars, book covers and other printed products. After the workpiece is stamped, it can be immediately packaged and transported. Therefore, the hot stamping technology is widely used, and the scope of application of hot stamping is still expanding.

[0003] Semi-automatic hot stamping machines are widely used in places with small production volumes due to their relatively simple structure, low cost and ease of use. Before the semi-automatic hot stamping machine performs hot stamping on an object, the object and the electroplated aluminum foil used for hot stamping need to be placed on a carrier plate, and then the staff manually or electrically presses the pressing plate (with a heating mechanism inside) to press the electroplated aluminum foil on the object (the electric pressing plate is generally controlled to rise or fall by an electric telescopic rod). Since the semi-automatic hot stamping machine needs to perform hot stamping on objects of different sizes and shapes, the area of ​​its carrier plate is much larger than that of the pressing plate, which requires the staff to place the object to be pressed in the center of the carrier plate. In the subsequent pressing of the electroplated aluminum foil by the pressing plate, the weight and heat of the pressing plate can effectively act on the electroplated aluminum foil to achieve a good pressing effect (if the object is not placed in the center of the carrier plate, the heat and pressure of the pressing plate cannot effectively act on the electroplated aluminum foil, so a good pressing effect cannot be achieved, which has an adverse effect on the quality of the finished product). Finally, the existing semi-automatic hot stamping machine manually transfers the object from the carrier plate to the finished product placement station after hot stamping, which not only brings inconvenience to the staff, but also is not conducive to improving work efficiency. Based on the above, it is particularly necessary to provide a collaborative semi-automatic hot stamping machine, which is particularly suitable for hot stamping control of paper with a certain thickness, etc., does not require the staff to repeatedly adjust the position of the object on the carrier plate, can ensure the hot stamping effect of the object, and can automatically transfer the positioning mechanism of the finished product after hot stamping. Summary of the invention

[0004] In order to overcome the problem that the existing semi-automatic hot stamping machine needs to repeatedly adjust the object to be located in the center position on the carrier plate due to structural limitations, which will bring inconvenience to the staff, is not conducive to improving work efficiency, and cannot effectively ensure the drawbacks of hot stamping effect, the present invention provides a collaborative semi-automatic hot stamping machine for pressing paper and the like. In application, under the joint action of relevant mechanisms and circuits, the staff only needs to put the paper and the like and the electrochemical aluminum foil on the carrier plate when working, and the three sets of limiting mechanisms can automatically adjust the paper and the like to the middle of the carrier plate, and the system can automatically perform hot stamping on the paper and the like. After the hot stamping is completed, the paper and the like can be transferred from the hot stamping station to the placing station through the suction cup, thereby bringing convenience to the staff, improving work efficiency, and ensuring the hot stamping effect. An adjustable paper pressing and positioning mechanism for a printed hot stamping machine.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] An adjustable paper pressing and positioning mechanism for a hot stamping machine for printed materials, comprising an electric linear slide, a vacuum suction cup, an electromagnetic valve, a vacuum pump, a power module, a power switch, a PLC, and an electric push rod, characterized in that it also has a control circuit and a limit mechanism; there are two electromagnetic valves, and there are multiple sets of control circuits and limit mechanisms; the electric linear slide has two sliding blocks, the lower end of the support frame of the hot stamping machine electric pressure plate and the lower end of the electric push rod are respectively installed on the two sliding blocks of the electric linear slide, the upper end of the movable rod of the electric push rod is installed with a fixed plate, and the front end of the fixed plate is installed with an air pipe, the upper end of the air pipe is connected to one end of the first electromagnetic valve, the other end of the first electromagnetic valve is connected to the air inlet pipe of the vacuum pump, the lower end of the air pipe is connected to the connecting pipe of the vacuum suction cup, and one end of the second electromagnetic valve is connected in parallel with the side end of the air pipe; each set of limit mechanisms comprises an electric push rod A, a force-sensitive resistor, a movable plate, and a guide shell, the force-sensitive resistor is installed on the inner side of the guide shell, the movable plate is elastically installed at the front and rear ends of the guide shell, and the outer end and the force-sensitive resistor are connected to the guide shell. The force-sensitive resistor is in contact with the force-bearing surface of the guide shell, and the lower end of the guide shell is installed together with the movable rod of the electric push rod A; among the multiple sets of limiting mechanisms, the electric push rods A of two sets of limiting mechanisms are respectively installed horizontally on the left and right sides of the inner middle part of the hot stamping machine bearing plate, and the electric push rod A of the third set of limiting mechanism is longitudinally installed on the middle part of the rear end of the bearing plate, and the middle part of the upper end of the bearing plate has guide grooves in the horizontal and longitudinal directions, and the rear end of the bearing plate is installed with a limiting plate; the power module, power switch, PLC, control circuit, and limiting mechanism are installed in the electric control box; the power output ends of the multiple sets of control circuits and the power input ends of the electric push rods A of the multiple sets of limiting mechanisms are electrically connected respectively, and the signal input and output ends of the multiple sets of control circuits are electrically connected; the two wiring terminals of the force-sensitive resistors of the multiple sets of limiting mechanisms are respectively electrically connected in series between the two trigger ends of the multiple sets of control circuits; the multi-channel power output end of the PLC is electrically connected to the power input ends of the electric telescopic rod, electric linear slide, electric push rod, and solenoid valve of the hot stamping machine.

[0007] Furthermore, the middle parts of the connecting rods of two of the limiting mechanisms are respectively located in the left and right side ends of the transverse distribution guide groove, and the middle part of the connecting rod of the third set of limiting mechanisms is located in the front side end of the longitudinal distribution guide groove.

[0008] Furthermore, the outer diameter of the middle portion of the connecting rod of the limiting mechanism is smaller than the width of the guide groove.

[0009] Furthermore, the inner sides of the guide shells of two of the limit mechanisms are in a face-to-face state, and when the two are respectively located at the left and right stop points, the distance between them is greater than the left and right widths of the paper to be stamped; the guide shell of the third set of limit mechanisms faces the rear end, and when it is located at the front stop point, the distance between it and the front end of the limit plate is greater than the front and rear widths of the paper to be stamped.

[0010] Furthermore, the electric push rod and the electric push rod A are reciprocating electric telescopic rods, and the solenoid valve is a normally closed valve core solenoid valve.

[0011] Furthermore, the front end of the limiting plate is positioned further back than the rear end of the pressing plate.

[0012] Furthermore, each set of control circuits includes an electrically connected first resistor, an adjustable resistor, an NPN transistor, and a relay; one end of the adjustable resistor is connected to one end of the first resistor, the positive power input end and the control power input end of the first relay, and the control power input end of the second relay; the normally closed contact end of the first relay is connected to the positive power input end of the second relay; the other end of the first resistor is connected to the base of the NPN transistor, the collector of the NPN transistor is connected to the negative power input end of the first relay, and the other end of the adjustable resistor is connected to the emitter of the NPN transistor and the negative power input end of the second relay.

[0013] Furthermore, the limiting plate is a fourth limiting mechanism, and the guide shell of the fourth limiting mechanism and the guide shell of the third limiting mechanism are in a front-to-back face-to-face state.

[0014] Furthermore, a finished product display frame is installed at the side end of the hot stamping machine.

[0015] The beneficial effects of the present invention are as follows: the present invention cooperates with a semi-automatic hot stamping machine to press paper, etc., and is suitable for hot stamping of paper with a relatively large thickness. In the application, the staff puts the paper and the electroplated aluminum foil to be stamped on the carrier plate (the electroplated aluminum foil is located on the paper), and then turns on the power switch and then no further operation is required; the three sets of control circuits will respectively control the three sets of limit mechanisms to gather the paper to the middle of the carrier plate, and when the appropriate position is reached, the limit mechanism stops working, and the subsequent PLC automatically controls the downward movement of the pressure plate to press the electroplated aluminum foil on the paper, and then the vacuum suction cup automatically transfers the pressed finished product to the finished product placement station. The present invention brings convenience to the staff, improves work efficiency, and ensures the hot stamping effect. Based on the above, the present invention has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the local structure of the present invention.

[0019] Figure 3 This is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0020] Figure 1 , 2As shown in Figure 3, an adjustable paper pressing and positioning mechanism for a hot stamping machine for printed materials includes an electric linear slide M4, a vacuum suction cup 1, solenoid valves DC and DC1, a vacuum pump (not shown in the figure), a power module U1, a power switch S, PLCU2, an electric push rod M5, and also has a control circuit 2 and a limit mechanism 3; there are two solenoid valves DC and DC1, and three sets of control circuits 2 and limit mechanisms 3 respectively; the electric linear slide M4 has two sliding blocks distributed at a certain distance, and the rear lower end of the support frame of the hot stamping machine electric pressing plate 41 (pressing plate mechanism) is installed on the sliding block at the left end of the electric linear slide M4 through a screw nut, and the lower end of the cylinder of the electric push rod M5 is vertical. The straight distribution is installed on the sliding block at the right end of the electric linear slide M4 through a screw nut. A fixed plate 5 is welded horizontally in front of the upper end of the movable rod of the electric push rod M5. An air pipe 6 is welded vertically in the middle of the front end of the fixed plate 5. The upper end of the air pipe 6 is connected to one end of the first solenoid valve DC through a threaded connection. The other end of the first solenoid valve DC is connected to the air inlet pipe of the vacuum pump in the workshop (the working mode is controlled by PLCU2, and the solenoid valve DC is powered and works at the same time) through a pipeline. The lower end of the air pipe 6 is connected to the connecting pipe at the upper end of the vacuum suction cup 1 through a threaded connection. One end of the second solenoid valve DC1 is connected to the middle part of the air pipe 6 in parallel through a pipeline; each set of limiting mechanisms includes an electric push rod AM1 (or M2, M3), force-sensitive resistor RT (or RT1, RT2), movable plate 32, guide shell 33, the upper end, lower end and inner end of the guide shell 33 are open structures, the force-sensitive resistor RT (or RT1, RT2) is installed on the circuit board, the circuit board is installed in the middle of the inner side of the guide shell 33, the outer end of the movable plate 32 is glued with an elastic rubber plate 34, the front and rear ends of the rubber plate 34 are glued to the inner side of the front and rear ends of the guide shell 33, and the outer end of the rubber plate 34 is in contact with the force-bearing surface of the force-sensitive resistor RT (or RT1, RT2), and a "└"-shaped connecting rod 35 is welded in the middle of the outer lower end of the guide shell 33, and the inner end of the connecting rod 35 is connected to the electric The movable rods of the push rods AM1 (or M2, M3) are welded together; among the three sets of limiting mechanisms 3, the cylinders of the electric push rods AM1 and M2 of two sets of limiting mechanisms are horizontally installed on the left and right sides of the inner middle part of the hollow bearing plate 42 of the hot stamping machine through screws and nuts, and the cylinder of the electric push rod AM3 of the third set of limiting mechanism is longitudinally installed on the middle part of the rear end of the bearing plate 42 through screws and nuts. The middle part of the upper end of the bearing plate 42 has a guide groove 43 (the connecting rod moves along the guide groove) in the horizontal and longitudinal directions, and a limiting plate 44 is welded on the rear end of the bearing plate; the power module U1, the power switch S, the PLCU2, and the control circuit 2 are installed in the electric control box of the hot stamping machine 4.

[0021] Figure 1 , 23, the middle parts of the connecting rods 35 of the two sets of limiting mechanisms (the outer diameter is smaller than the width of the guide groove) are respectively located in the left and right outer ends of the transverse distribution guide groove 43, and the middle part of the connecting rod 35 of the third set of limiting mechanisms is located in the front end of the longitudinal distribution guide groove 43. The outer diameter of the middle part of the connecting rod 35 of the limiting mechanism is smaller than the width of the guide groove 43, and the lower end height of the guide shell 33 is 0.5 mm higher than the upper end height of the bearing plate 42 (lower than the thickness of the paper to be stamped). The inner sides of the guide shells 33 of the two sets of limiting mechanisms are in a face-to-face state, and the distance between them when they are respectively located at the left and right dead points is greater than the left and right width of the paper to be stamped; the guide shell 33 of the third set of limiting mechanisms faces the rear end, and when it is located at the front dead point, the distance between it and the front end of the limiting plate 44 is greater than the front and rear width of the paper to be stamped. The power module U1 is a finished product of a 220V / 24V / 2KW AC 220V to DC 24V switch power module. The power switch S has two power input terminals and two power output terminals. The electric push rod M5 and the electric push rod AM1 (or M2, M3) are finished products of reciprocating electric telescopic rods. The solenoid valves DC and CDC1 are normally closed valve core solenoid valves with a working voltage of 24V DC and a power of 1W. The front end of the limit plate 44 is slightly behind the rear end of the pressure plate 41 by 1 mm. Each control circuit includes a resistor R (or R1, R2), an adjustable resistor RP (or RP1, RP2), an NPN transistor Q (or Q1, Q2), relays K and K3 (or K1, K4, K2 and K5) connected via circuit board wiring. One end of the adjustable resistor RP (or RP1, RP2) is connected to one end of the resistor R (or R1, R2), the positive power input end of the first relay K (or K1, K2) and the control power input end. The normally closed contact end of the first relay K (or K1, K2) is connected to the positive power input end of the first relay K (or K1, K2). The second relay K3 (or K4, K5) is connected to the positive power input terminal, the other end of the resistor R (or R1, R2) is connected to the base of the NPN transistor Q (or Q1, Q2), the collector of the NPN transistor Q (or Q1, Q2) is connected to the negative power input terminal of the first relay K (or K1, K2), and the other end of the adjustable resistor RP (or RP1, RP2) is connected to the emitter of the NPN transistor Q (or Q1, Q2) and the negative power input terminal of the second relay K3 (or K4, K5). The limit plate 44 can also be replaced by a fourth set of limit mechanisms, and the guide shell of the fourth set of limit mechanisms and the guide shell of the third set of limit mechanisms are in a front-to-back face-to-face state. The right end of the hot stamping machine 4 is equipped with a finished product placement frame (not shown in the figure) whose height is lower than the load plate, which is used to place the hot stamped finished products.

[0022] Figure 1 , 2As shown in Figure 3, the power input terminals 1 and 2 of the power module U1 are connected to the two poles of the AC 220V AC power supply via wires, the power output terminals 3 and 4 of the power module U1 are connected to the power input terminals 1 and 2 of the power switch S via wires, the first power output terminals 3 and 4 of the power switch S are connected to the positive and negative power input terminals of the electric push rods AM1 (or M2, M3) of the three sets of limit mechanisms via wires, and the power output terminals 5 and 6 of the power switch S are connected to the power input terminals of the three sets of control circuits, the positive power input terminals of the relays K (or K1, K2) and the emitters of the NPN transistors Q (or Q1, Q2) via wires. The normally closed contact end of the signal output end relay K3 of the first control circuit and the control power input end of the signal input end relay K4 of the second control circuit are connected through a wire, the normally closed contact end of the signal output end relay K4 of the second control circuit and the control power input end of the signal input end relay K5 of the third control circuit are connected through a wire, the normally closed contact end of the signal output end relay K6 of the third control circuit and the 4th pin of the power module U1 and the 1st and 2nd pins of the power input end of PLCU2 are connected through a wire respectively; the control power input end relay K3 of the signal input end of the first control circuit is connected to the 3rd pin of the power module U1. The normally closed contact end of the control power output end relay K of each control circuit and the emitter of the NPN transistor Q (or the normally closed contact end of the relay K1 and the emitter of the NPN transistor Q1, the normally closed contact end of the relay K2 and the emitter of the NPN transistor Q3) and the negative and positive power input ends of the electric push rod A M1 (or M2, M3) of each limit mechanism are connected through wires respectively. The two terminals of the force-sensitive resistor RT (or RT2, RT2) of the three limit mechanisms are connected in series through wires between the two trigger terminals of the three control circuits, the positive power input terminal of the relay K and one end of the adjustable resistor RP (or the positive power input terminal of the relay K1 and one end of the adjustable resistor RP1, the positive power input terminal of the relay K2 and one end of the adjustable resistor RP2). The eight power output terminals 3, 4, 5, 6, 7, 8, 9, 10 of PLCU2 and the positive and negative poles and the negative and positive poles power input terminals of the electric linear slide M4, the positive and negative poles and the negative and positive poles power input terminals of the electric push rod M5, the positive and negative poles and the negative and positive poles power input terminals of the electric telescopic rod M6 of the hot stamping machine, and the power input terminals of the two solenoid valves DC and DC1 are connected through wires.

[0023] Figure 1 , 2As shown in FIG. 3, after the 220V AC power enters the power input terminals 1 and 2 of the power module U1, the 3 and 4 pins of the power module U1 will output a stable DC 24V power supply to the power input terminal of the power switch S, so that the power switch S (the handle is located outside the electric control box) is powered on. The present invention cooperates with a semi-automatic hot stamping machine to press paper, etc., and is suitable for hot stamping of paper with a relatively large thickness. In the application, the staff puts the paper and the electroplated aluminum foil to be stamped on the carrier plate 42 (the electroplated aluminum foil is located on the paper hot stamping station), and turns on the power switch S, and then no further operation is required. When the staff turns the handle of the power switch S to the right, the 1st and 2nd pins and the 5th and 6th pins of the power switch S are connected respectively, so that the three sets of control circuits will be powered on and work. After the three sets of control circuits are powered on and work, the positive pole of the 24V power supply will enter the negative power input terminal of the electric push rod AM1 (or M2, M3) through the control power input terminal and the normally closed contact terminal of the relay K (or K1, K2), and the negative pole of the 24V power supply directly enters the positive power input terminal of the electric push rod AM1 (or M2, M3). Therefore, after the negative and positive poles of the electric push rod AM1 (or M2, M3) are energized, its movable rod drives the guide shell 33 to move toward the inner side end (the guide shell 33 of the left and right limit mechanisms moves toward the inner side end, and the guide shell of the front limit mechanism moves toward the rear side end), gradually approaching the left and right sides and the front side of the paper (the rear end of the paper contacts the front end of the limit plate), and at the same time, the three relays K3, K4, and K5 When energized, the control power input terminal and the normally closed contact terminal are open; when the inner side end of the movable plate 32 of the three sets of limit mechanisms does not contact the left side, right side or front side of the paper, the force acting on the force-bearing surface of the force-sensitive resistor RT (or RT21, RT2) is relatively small, its resistance value is large, and the voltage division between the adjustable resistors RP (or RP1, RP2) is large. In this way, the positive electrode of the 24V power supply enters the base voltage of the NPN transistor Q (or Q1, Q2) after current limiting and voltage reduction by the resistor R (or R1, R2), which is lower than the 0.7V starting voltage of the NPN transistor Q (or Q1, Q2). The NPN transistor Q (or Q1, Q2) is cut off, and the relay K (or K1, K2) continues to lose power. Then, the negative and positive poles of the electric push rod AM1 (or M2, M3) continue to be energized, and its movable rod drives the guide shell 33 to move toward the inner side, and continues to move closer to the left, right and front sides of the paper.When the inner ends of the movable plates 32 of the three sets of limit mechanisms contact the left end, right end or front end of the paper, the force acting on the force-bearing surface of the force-sensitive resistor RT (or RT1, RT2) is relatively large, its resistance value becomes relatively small, and the voltage divided between the adjustable resistors RP (or RP11, RP2) is small. In this way, the positive electrode of the 24V power supply enters the base voltage of the NPN transistor Q (or Q1, Q2) after the resistor R (or R1, R2) limits the current and reduces the voltage. It is higher than the base voltage of the NPN transistor Q (or Q1 , Q2) of 0.7V starting voltage, NPN transistor Q (or Q1, Q2) conducts collector output low level into the negative power input terminal of relay K (or K1, K2), so relay K (or K1, K2) is energized to close its control power input terminal and open the normally closed contact terminal, then the negative and positive poles of the electric push rod AM1 (or M2, M3) are no longer energized and its movable rod no longer drives the guide shell 33 to move toward the inner side, and no longer moves close to the left and right sides and the front side of the paper. Through the above, under the control of three sets of limit mechanisms and three sets of control circuits, when the left end, right end and front and rear ends of the paper to be stamped are squeezed together, that is, when the paper is located at the lower end of the pressure plate, the three sets of limit mechanisms will automatically stop working.

[0024] Figure 1 , 2 As shown in Figures 3 and 4, in the present invention, when the three sets of limit mechanisms fail to effectively gather the paper in the middle of the upper end of the carrier plate, as long as one relay K or K1, K2 is not energized to close its control power input terminal and the normally closed contact terminal, and one of the three relays K3, K4, and K5 is energized to close its control power input terminal and the normally closed contact terminal, then the positive electrode of the 24V power supply will not enter the positive power input terminal of PLCU2 through the control power input terminal and the normally closed contact terminal of relay K3, the control power input terminal and the normally closed contact terminal of relay K4, and the control power input terminal and the normally closed contact terminal of relay K5. Only when three sets of limit mechanisms are combined with the limit plate to gather the paper in the middle of the upper end of the carrier plate, all relays K or K1, K2 are energized to attract their control power input terminals and normally closed contact terminals to open the circuit, and the three relays K3, K4, and K5 are de-energized and no longer attract their control power input terminals and normally closed contact terminals to close, the positive pole of the 24V power supply will enter the positive power input terminal 1 of the PLC through the control power input terminal and normally closed contact terminal of relay K3, the control power input terminal and normally closed contact terminal of relay K4, and the control power input terminal and normally closed contact terminal of relay K5, and PLCU2 will be energized to work. Through the above, it can be said that only after the paper is effectively gathered in the middle of the upper end of the carrier plate, will PLCU2 be energized to work and the subsequent hot stamping process of the paper will be carried out, which effectively prevents the pressure plate from hot stamping the paper when the paper is not on the carrier plate, resulting in poor hot stamping effect.

[0025] Figure 1 , 2As shown in Figure 3, in the present invention, when PLCU2 is powered on, its 7th pin (with two power output terminals) outputs positive and negative power for a period of time (for example, 5 seconds) to enter the positive and negative power input terminals of the electric telescopic rod M6 of the hot stamping machine. In this way, the movable rod of the electric telescopic rod M6 moves downward to push the pressing plate 41 to press on the electroplated aluminum foil and then stops moving, pressing the electroplated aluminum foil on the paper. When PLCU2 is powered on, its 7th pin outputs power for a period of time. After an interval of 3 seconds, PLCU2's 8th pin (with two power output terminals) outputs positive and negative power for a period of time (for example, 5 seconds) to enter the negative and positive power input terminals of the electric telescopic rod M6 of the hot stamping machine. In this way, the movable rod of the electric telescopic rod M6 moves upward to drive the pressing plate to move upward for a distance and stops to return to the initial state, preparing for the next time to press the electroplated aluminum foil on the paper. Subsequently, the 3rd pin (with two power output terminals) of PLCU2 outputs the positive and negative power for a period of time (for example, 4 seconds) to enter the positive and negative power input terminals of the motor of the electric linear slide M4, so that the two movable blocks of the electric screw slide M4 respectively drive the pressing plate mechanism and the electric push rod M5 of the hot stamping machine to move a distance to the left and stop. At this moment, the pressing plate mechanism is located at the left end of the hot stamping machine, and the vacuum suction cup 1 is located at the upper end of the pressed paper; subsequently, the 5th pin of PLCU2 outputs the positive and negative power for a period of time (for example, 3 seconds) to enter the positive and negative power input terminals of the electric push rod M5, and the movable rod of the electric push rod M5 moves down a distance and stops, so that the lower end of the vacuum suction cup just touches the upper end of the paper. Then, the 9th pin of PLCU2 outputs power for a period of time (for example, 6 seconds) to the power input terminal of the solenoid valve DC, so that the vacuum pump that is energized at this moment draws out the air in the suction cup, and the lower end of the suction cup surface generates negative pressure suction on the upper end of the paper (the limiting force of the three sets of limit mechanisms on the paper is much smaller than the adsorption force of the vacuum suction cup); then, the 6th pin of PLCU2 outputs negative and positive power for a period of time (for example, 3 seconds) to enter the negative and positive power input terminals of the electric push rod M5, and the movable rod of the electric push rod M5 drives the paper after the stamping to move up a distance and stop. Then, the 4th pin of PLCU2 outputs power for a period of time (for example, 4 seconds) to the negative and positive power input terminals of the motor of the electric linear slide M4, so that the two movable blocks of the electric linear slide M4 respectively drive the pressure plate mechanism and the electric push rod M5 to move to the right end for a distance and stop, and the pressure plate mechanism will be located at the upper end of the carrier plate, and the suction cup and paper will be located at the finished product placement station. Subsequently, pin 9 of PLCU2 stops the power supply, and pin 10 of PLCU2 outputs power for a period of time (for example, 2 seconds) to the power input terminal of the solenoid valve DC1. Then, the solenoid valve DC is energized and its internal valve core opens. In this way, the external air will enter the vacuum suction cup, and the vacuum suction cup will no longer generate negative pressure suction on the paper. After hot stamping, the paper falls on the finished product station.Finally, the staff turns the handle of the power switch to the left, so that the 1, 2 and 3, 4 feet of the power switch S are connected respectively. In this way, the positive poles of the electric push rods M1, M2 and M3 of the three sets of limit mechanisms are energized, and their movable rods push the guide shell to the left, right outer ends and the front end for a distance and then stop. Then the staff puts the next piece of paper and anodized aluminum foil on the carrying plate, which is exactly the same as the above process, and then starts the hot stamping work of the next piece of paper. In the present invention, when the resistance of the adjustable resistor RP or RP1, RP2 is adjusted to be relatively small, its divided voltage is small, then in actual application, the pressure of the limit mechanism on the paper is relatively large, the force on the force-sensitive resistor RT is relatively large, the resistance value is relatively small, and the divided voltage between the adjustable resistors RP or RP1, RP2 is relatively small, the base voltage entering the NPN transistor Q or Q1, Q2 will be higher than 0.7V, and the relay K or K1, K2 will be electrically attracted, that is, the threshold value of the gathering pressure of the paper of the present invention becomes larger; when the resistance of the adjustable resistor RP or RP1, RP2 is adjusted to be relatively large, its divided voltage is large, then in actual application, the pressure of the limit mechanism on the paper is relatively small, the force on the force-sensitive resistor RT is relatively small, the resistance value is relatively large, and the divided voltage between the adjustable resistors RP or RP1, RP2 is relatively large, the base voltage entering the NPN transistor Q or Q1, Q2 will be higher than 0.7V, and the relay K or K1, K2 will be electrically attracted, that is, the threshold value of the gathering pressure of the paper of the present invention becomes smaller. Figure 3 Among them, relays K, K1, K2, K3, K4, and K5 are DC24V relays; NPN transistors Q, Q1, and Q2 are of model 9013; resistances R, R1, and R2 are 47K; force-sensitive resistors RT, RT1, and RT2 are resistive film pressure sensors of model FSR402; and adjustable resistors RP, RR1, and RP2 are of model 100K (adjusted to 13K respectively).

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0027] In addition, it should be understood that although the present specification is described according to the implementation mode, the implementation mode does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An adjustable paper pressing and positioning mechanism for a printed product hot stamping machine, comprising an electric linear slide, a vacuum suction cup, a solenoid valve, a vacuum pump, a power module, a power switch, a PLC, and an electric push rod, characterized in that It also has a control circuit and a limit mechanism; there are two solenoid valves, and there are multiple sets of control circuits and limit mechanisms; the electric linear slide has two sliding blocks, the lower end of the support frame of the hot stamping machine electric pressing plate and the lower end of the electric push rod are respectively installed on the two sliding blocks of the electric linear slide, and the upper end of the movable rod of the electric push rod is installed with a fixed plate, and the front end of the fixed plate is installed with an air pipe, the upper end of the air pipe is connected to one end of the first solenoid valve, the other end of the first solenoid valve is connected to the air inlet pipe of the vacuum pump, the lower end of the air pipe is connected to the connecting pipe of the vacuum suction cup, and one end of the second solenoid valve is connected in parallel with the side end of the air pipe; each set of limit mechanisms includes An electric push rod A, a force-sensitive resistor, a movable plate, and a guide shell, wherein the force-sensitive resistor is installed on the inner side of the guide shell, the movable plate is elastically installed at the front and rear ends of the guide shell, and the outer end is in contact with the force-bearing surface of the force-sensitive resistor, and the lower end of the guide shell and the movable rod of the electric push rod A are installed together; among the multiple sets of limit mechanisms, the electric push rods A of two sets of limit mechanisms are respectively installed horizontally on the left and right sides of the inner middle part of the hot stamping machine bearing plate, and the electric push rod A of the third set of limit mechanisms is longitudinally installed on the middle part of the rear end of the bearing plate, the middle part of the upper end of the bearing plate has guide grooves in the horizontal and longitudinal directions, and a limit plate is installed on the rear end of the bearing plate; the power module , power switch, PLC, control circuit, and limit mechanism are installed in the electric control box; the power output ends of the multiple control circuits and the power input ends of the electric push rods A of the multiple limit mechanisms are electrically connected respectively, and the signal input and output ends of the multiple control circuits are electrically connected; the two wiring ends of the force-sensitive resistors of the multiple limit mechanisms are electrically connected in series between the two trigger ends of the multiple control circuits; the multi-channel power output end of the PLC and the power input ends of the electric telescopic rods, electric linear slides, electric push rods, and solenoid valves of the hot stamping machine are electrically connected respectively; the middle parts of the connecting rods of the two limit mechanisms are respectively located in the transverse distribution guide grooves. The middle part of the connecting rod of the third set of limiting mechanisms is located in the front end of the longitudinally distributed guide groove; the outer diameter of the middle part of the connecting rod of the limiting mechanism is smaller than the width of the guide groove; the inner sides of the guide shells of the two sets of limiting mechanisms are in a face-to-face state, and the distance between them when they are respectively located at the left and right dead points is greater than the left and right widths of the paper to be stamped; the guide shell of the third set of limiting mechanisms faces the rear end, and when it is located at the front dead point, the distance between it and the front end of the limiting plate is greater than the front and rear widths of the paper to be stamped; the electric push rod and the electric push rod A are reciprocating electric telescopic rods, and the solenoid valve is a normally closed valve core solenoid valve; the front end of the limiting plate is located further back than the rear end of the pressure plate;Each set of control circuits includes an electrically connected first resistor, an adjustable resistor, an NPN transistor, and a relay. One end of the adjustable resistor is connected to one end of the first resistor, the positive power input end and the control power input end of the first relay, and the control power input end of the second relay. The normally closed contact end of the first relay is connected to the positive power input end of the second relay. The other end of the first resistor is connected to the base of the NPN transistor, the collector of the NPN transistor is connected to the negative power input end of the first relay, and the other end of the adjustable resistor is connected to the emitter of the NPN transistor and the negative power input end of the second relay. The limit plate is the fourth set of limit mechanisms, and the guide shell of the fourth set of limit mechanisms and the guide shell of the third set of limit mechanisms are in a front-to-back face-to-face state. The side end of the hot stamping machine is equipped with a finished product placement frame. ;

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