A platemaking system for wide-area laser holographic master production

Abstract

The present invention provides a platemaking system for wide-surface laser holographic master production, comprising an upper steel platform and a lower steel platform arranged relatively up and down, and also comprising a mobile platform and a motion component, wherein the mobile platform comprises a single-column hydraulic press body and a platemaking component fixed to the lower end of the single-column hydraulic press body, the single-column hydraulic press body is movably suspended above the lower steel platform, the motion component is connected to the single-column hydraulic press body and can drive the single-column hydraulic press body to move along mutually perpendicular X-axis and Y-axis, the lower steel platform is used to fix the platemaking substrate, and the single-column hydraulic press body can drive the platemaking component to move downward and press against the platemaking substrate when it is started. The present invention not only solves the problem of relative error caused by the simultaneous movement of the substrate and the platemaking head of the ordinary platemaking machine, but also reduces the surface temperature of the plate substrate at this position, reduces thermal deformation, and is beneficial to the uniformity and stability of the quality of the holographic image.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-fine processing and laser holography, and in particular to a platemaking system for producing a wide-surface laser holographic master. Background Art

[0002] With the development of embossing holographic technology, laser holographic printing technology is widely used in the anti-counterfeiting of tobacco, salt, pharmaceutical and other industries, as well as the promotion and use of holographic packaging films in these industries. In order to improve production efficiency and meet the needs of wide-format materials, the wide-format platemaking technology in the field of laser holography has emerged. Platemaking technology is a technology that uses the principle of hot embossing transfer to transfer unit holographic images of various ultra-fine grooves to the substrate, and then repeatedly transfers them according to the required size, and finally splices them into a wide-format holographic master. The important equipment for realizing this technology is the wide-format platemaking machine.

[0003] Ordinary wide format platemaking machine (such as Figure 1 As shown in the figure, a four-column hydraulic press generally provides pressure, a heating plate b1 provides heat, a unit image working plate is pasted on a platemaking head b2, a b2 platemaking head is suspended on a transverse guide rail c and can move along the transverse guide rail c, a platemaking substrate a is fixed on a square frame e, a square frame e is placed on a longitudinal guide rail d fixed on a lower base and the square frame e can move along the longitudinal guide rail d, so that the platemaking substrate a is suspended relative to the lower base, while the platemaking head b2 can move left and right. When the hydraulic column contracts downward, the platemaking head b2 is squeezed with the lower base under the substrate a, thereby realizing the transfer of the unit image on the platemaking head b2 to the platemaking substrate a. Repeating the operation can transfer the unit image to the platemaking substrate a in a certain size arrangement to obtain a wide-format holographic master.

[0004] Ordinary wide format platemaking machine (such as Figure 1 Defects shown):

[0005] The four-column hydraulic press that provides pressure determines that the ordinary platemaking machine is an open-sided form, and the platemaking substrate a is directly exposed in the workshop. Dust particles flowing in the air are easy to adhere to the platemaking substrate a, affecting the image quality and reducing the qualified rate of finished products.

[0006] The imposition substrate a is suspended and fixed on the frame e, and it is very easy to expand and deform when heated. The holographic image is prone to position displacement and uneven heating during printing. Especially when the unit holographic image is large, it is more likely to have uneven pressure and heating, resulting in quality problems such as uneven brightness of the holographic image, resulting in waste.

[0007] When a common wide format platemaking machine is working, the platemaking head b2 must move left and right and up and down, and the platemaking substrate a must also move forward and backward along with the frame. This can easily lead to the problem of low position accuracy of the holographic image on the substrate a, which can seriously affect the product qualification rate. Summary of the invention

[0008] The object of the present invention is to provide a platemaking system for producing wide-surface laser holographic masters, which can produce holographic masters with better quality.

[0009] The present invention provides a platemaking system for producing a wide-surface laser holographic master, comprising an upper steel platform and a lower steel platform which are arranged relatively to each other, and also comprising a movable platform and a motion component, wherein the movable platform comprises a single-column hydraulic press body and a platemaking component fixed to the lower end of the single-column hydraulic press body, the single-column hydraulic press body is movably suspended above the lower steel platform, the motion component is connected to the single-column hydraulic press body and can drive the single-column hydraulic press body to move along an X-axis and a Y-axis which are perpendicular to each other, the lower steel platform is used to fix a platemaking substrate, and when the single-column hydraulic press body is started, the platemaking component can be driven to move downward and press toward the platemaking substrate.

[0010] Furthermore, it also includes an automatic cleaning device, which includes an air jet, an air tank and an air pipe connecting the air jet and the air tank, the air pipe is provided with a solenoid valve for controlling the air outlet and a pressure regulating valve for adjusting the wind force, the air jet is fixed to the mobile platform and faces the plate-making substrate, and is used for cleaning the plate-making substrate and reducing the temperature of the surface of the plate-making substrate.

[0011] Furthermore, the area between the upper steel platform and the lower steel platform is a working area, the mobile platform and the motion component are both located within the working area, dustproof barriers are provided around the working area, the dustproof barriers make the working area constitute a closed space, including support columns for supporting the upper steel platform and the lower steel platform and transparent windows and transparent doors embedded between the support columns, an illumination light source is installed in the working area, the illumination light source is arranged opposite to the transparent door, and the illumination light source is closer to the upper steel platform than the upper steel platform.

[0012] Furthermore, the motion component includes a mounting plate, and also includes an X-axis guide rail fixed to the upper steel platform and a Y-axis guide rail arranged on the mounting plate, the mounting plate can move along the X-axis guide rail, and the single-column hydraulic press body can move along the Y-axis guide rail on the mounting plate; the motion component also includes an X-axis ball screw, a Y-axis ball screw and a servo motor for driving the X-axis ball screw and the Y-axis ball screw to rotate respectively, the X-axis ball screw is connected to the mounting plate to drive it to move along the X-axis guide rail, and the Y-axis ball screw is connected to the single-column hydraulic press body to drive it to move along the Y-axis guide rail.

[0013] Furthermore, the single-column hydraulic press body includes a hydraulic cylinder, a cantilever and a lower piston rod, the cantilever is connected to the upper end of the hydraulic cylinder and the mounting plate, the upper end of the lower piston rod can slide up and down in the hydraulic cylinder, the lower end of the lower piston rod is connected to the plate assembly, the hydraulic cylinder is connected to the hydraulic pump, and the lower piston rod can move up and down as the hydraulic pump pumps oil into or out of the hydraulic cylinder.

[0014] Furthermore, the cantilever is an upper piston rod, the lower end of which can slide up and down in the hydraulic cylinder, and the upper end of which is a free end that can freely pass through the mounting plate. When hydraulic oil is pumped into the hydraulic cylinder, the free end of the upper piston rod can move upward and press against the upper steel platform.

[0015] Furthermore, the single-column hydraulic press body also includes a displacement plate, the hydraulic cylinder is fixed to the mounting plate, the displacement plate is fixed to the lower piston rod and can move up and down with the plate assembly, and a plurality of return springs connect the displacement plate and the mounting plate.

[0016] Furthermore, the displacement plate is located at the lower side of the hydraulic cylinder, a plurality of limit springs are connected between the plate assembly and the displacement plate, and the plurality of limit springs are evenly arranged around the lower piston rod.

[0017] Furthermore, two horizontal adjustment screws are provided at opposite ends of the displacement plate along the X-axis direction, and the end of the lower piston rod is a rotating unit with a micro-ball head, and the horizontal adjustment screws can adjust the rotating unit to tilt by 0° to 10°.

[0018] Furthermore, the platemaking assembly includes, from top to bottom, a base, a heat-insulating plate, a heating plate with a thermistor, and a detachable platemaking head. The lower piston rod is connected to the upper end of the base. When the lower top steel platform fixes the platemaking substrate, the platemaking substrate is fixed tightly against the lower top steel platform.

[0019] The beneficial effects of the present invention are:

[0020] (1) The present invention adopts a method in which the platemaking substrate is fixed on the lower top steel platform, without movement error. Only the platemaking head moves driven by a high-precision servo motor and a ball screw, thus solving the problem of relative error caused by the simultaneous movement of the substrate and the platemaking head of an ordinary platemaking machine.

[0021] (2) The invention has an automatic cleaning device. Before each pressing of the plate-making head, the clean nitrogen in the gas storage tank is sprayed from the air outlet to the position on the plate substrate to be pressed, which can blow away the dust on the surface of the plate substrate and reduce the surface temperature of the plate substrate at that position, thereby reducing thermal deformation, which is beneficial to the uniformity and stability of the quality of the holographic image.

[0022] (3) When the lower steel platform fixes the plate-making substrate, the plate-making substrate is fixed closely to the lower steel platform, so that the plate-making substrate as a whole is kept on the same horizontal plane, so that the pressure is stable and the heat is evenly distributed during operation, avoiding the method of fixing the substrate in the air on a moving frame in an ordinary plate-making machine, reducing the deformation of the substrate due to pressure and heat, and avoiding the position offset and uneven brightness of the holographic image.

[0023] (4) It is equipped with a dustproof barrier, and the transparent door can be closed during work, forming an independent and closed internal environment in the working area, reducing the generation of black spots on the holographic image caused by dust in the indoor air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of an existing common wide format imposition machine;

[0025] Figure 2 It is a schematic diagram of a plate imposition system for producing a wide-surface laser holographic master according to the present invention;

[0026] Figure 3 It is a schematic diagram of a mobile platform of a platemaking system for producing a wide-surface laser holographic master according to the present invention;

[0027] Figure 4 It is a schematic diagram of an automatic cleaning device of a platemaking system for manufacturing a wide-surface laser holographic master according to the present invention;

[0028] Figure 5 It is a schematic diagram of a main control system of a platemaking system for producing a wide-surface laser holographic master according to the present invention;

[0029] In the figure: 1. upper steel platform; 2. lower steel platform; 3. main body of single-column hydraulic press; 31. hydraulic cylinder; 32. cantilever; 33. lower piston rod; 34. displacement plate; 35. reset spring; 36. horizontal adjustment screw; 37. limit spring; 41. Y-axis ball screw; 42. X-axis ball screw; 43. servo motor; 5. lighting source; 6. plate substrate; 71. transparent window; 72. transparent door; 8. plate assembly; 81. base; 82. heat insulation board; 83. heating plate; 84. plate head; 91. air jet; 92. air pipe; 93. solenoid valve; 94. pressure regulating valve; 95. air tank; 101. emergency brake button; 102. emergency brake reset button; 103. hydraulic pressure regulator; 104. pressure test button; 105. main power switch; 106. temperature setting display screen. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0031] Please refer to Figures 2 to 5 The present invention provides a platemaking system for wide-surface laser holographic master production, comprising an upper steel platform 1 and a lower steel platform 2 arranged relatively to each other, and also comprising a moving platform and a motion component. The area between the upper steel platform 1 and the lower steel platform 2 is a working area, and the moving platform and the motion component are both located in the working area.

[0032] The working area is surrounded by dust barriers, which make the working area a closed space, including support columns for supporting the upper steel platform 1 and the lower steel platform 2, and transparent windows 71 and transparent doors 72 embedded between the support columns. In order to increase the brightness of the working area and make it easier for operators outside to observe, an illumination light source 5 is installed in the working area, and the illumination light source 5 is arranged opposite to the transparent door 72. The illumination light source 5 is closer to the upper steel platform 2 than the upper steel platform 1. Preferably, the illumination light source 5 is a horizontally arranged columnar or long strip lamp tube or light strip.

[0033] The mobile platform includes a single-column hydraulic press body 3 and a plate-making assembly 8 fixed to the lower end of the single-column hydraulic press body 3. The plate-making assembly 8 includes, from top to bottom, a base 81, a heat-insulating plate 82, a heating plate 83 with a thermal probe, and a detachable plate-making head 84. The lower top steel platform 2 fixes the plate-making substrate 6. When the plate-making substrate 6 is fixed, the plate-making substrate 6 is fixed close to the lower top steel platform 1.

[0034] The motion assembly includes a mounting plate, and also includes mutually perpendicular X-axis guide rails and Y-axis guide rails. The X-axis guide rail is fixed to the upper steel platform 1 or supported and suspended between the lower steel platform 2 and the upper steel platform 1. The Y-axis guide rail is arranged on the mounting plate. The mounting plate can move along the X-axis guide rail, and the single-column hydraulic press body 3 can move along the Y-axis guide rail on the mounting plate. The motion assembly also includes an X-axis ball screw 42, a Y-axis ball screw 41, and a servo motor 43 for driving the X-axis ball screw 42 and the Y-axis ball screw 41 to rotate respectively. The X-axis ball screw 42 is connected to the mounting plate to drive it to move along the X-axis guide rail, and the Y-axis ball screw 41 is connected to the single-column hydraulic press body 3 to drive it to move along the Y-axis guide rail. Through the operation of the two servo motors 43, the mounting plate can carry the mobile platform to perform planar motion (the motion direction includes the mutually perpendicular X-axis and Y-axis directions).

[0035] The single-column hydraulic press body 3 includes a hydraulic cylinder 31, a cantilever and a lower piston rod 33. The upper end of the lower piston rod 33 is slidable up and down in the hydraulic cylinder 31. The lower end of the lower piston rod 33 is connected to the base 81. The hydraulic cylinder 31 is connected to a hydraulic pump.

[0036] In embodiment 1, the cantilever is an upper piston rod 32, the mounting plate is located above the hydraulic cylinder 31 and has a through hole thereon, the lower end of the upper piston rod 32 can slide up and down in the hydraulic cylinder 31, and the upper end thereof is a free end that can freely pass through the through hole on the mounting plate. When hydraulic oil is pumped into the hydraulic cylinder 31 by a hydraulic pump, the free end of the upper piston rod 32 can move upward and press against the upper steel platform 1, and the lower piston rod moves downward and drives the platemaking assembly 8 to press down the platemaking substrate 6. At this time, the upper steel platform 1 presses downward against the upper piston rod 32 to provide a reaction force for the lower piston rod 33.

[0037] The single-column hydraulic press body 3 also includes a displacement plate 34, the hydraulic cylinder 31 is fixed to the mounting plate, the displacement plate 34 is fixed to the lower piston rod 33 and can move up and down with the plate assembly 8, and a plurality of return springs 35 connect the displacement plate 34 and the mounting plate. Preferably, a plurality of fixed columns are arranged on the mounting plate, and a fixed sleeve corresponding to the fixed columns is arranged on the displacement plate 34, and the lower end of the fixed column is inserted into the corresponding fixed sleeve and can slide up and down in the fixed sleeve, and the return spring 35 corresponds to the fixed column one by one, and each return spring 35 is sleeved on the corresponding fixed column, and the upper end of the return spring 35 is connected to the mounting plate, and the lower end is connected to the fixed sleeve. When the displacement plate 34 moves downward with the lower piston rod 33, the return spring 35 is stretched, and when the hydraulic pump withdraws the hydraulic oil in the hydraulic cylinder 31, the return spring 35 promotes the lower piston rod 33 to carry the plate assembly 8 to reset by pulling back the displacement plate 34. When the hydraulic pump draws back the oil in the hydraulic cylinder 31 to reset the lower piston rod 33 under the action of the pressure difference, the reset spring 35 assists the lower piston rod 31 in resetting, and also restricts the resetting speed and reduces the resetting damage.

[0038] The displacement plate 34 is located above the plate assembly 8, and preferably the displacement plate 34 is located at the lower side of the hydraulic cylinder 31. Two horizontal adjustment screws 36 are provided at opposite ends of the displacement plate 34 along the X-axis direction, and the end of the lower piston rod 33 is a rotating unit with a micro-ball head, and the lower piston rod 33 is connected to the plate assembly 8 through the rotating unit. The horizontal adjustment screw can adjust the rotating unit to tilt 0° to 10°, with a minimum adjustment angle of 0.1°, so that the plate assembly 8 can be rotated or tilted accordingly, so that the plate assembly 8 can be parallel to the plate substrate 6 under regulation.

[0039] A plurality of limit springs 37 are connected between the plate-making assembly 8 and the displacement plate 34, and the limit springs 37 are evenly arranged around the lower piston rod 33. The limit springs 37 are used for limiting and preventing shaking, so that the plate-making assembly 8 is more stable when pressing the plate-making substrate 6, and the plate-making assembly 8 will not deviate relative to the lower piston rod 33 when resetting.

[0040] The present invention also includes a main control system for control, including an emergency brake key 101, an emergency brake reset key 102, a hydraulic pressure regulator 103, a pressure test key 104, a main power switch 105, and a temperature setting display screen 106. The motion component is controlled by the emergency brake key 101 to achieve controllable emergency braking. The hydraulic pump is controlled by the hydraulic pressure regulator 103, and the pressure of the platemaking head 84 of the platemaking component 8 on the platemaking substrate 6 is controlled by the pressure test key 104. The temperature of the heating plate 83 is adjusted by the temperature setting display screen 106. The hydraulic pump is controlled by the emergency brake reset key 102 to make it emergency brake and reset the single-column hydraulic press body 3.

[0041] In embodiment one, the lower piston rod 33 can move up and down as the hydraulic pump pumps oil into or out of the hydraulic cylinder 31, the cantilever connects the upper end of the hydraulic cylinder 31 and the mounting plate, and the cantilever is fixed and does not move upward or downward, when the lower piston rod 33 carries the platemaking assembly 8 to press down the platemaking substrate 6, the mounting plate pushes down against the cantilever to provide a reaction force for the lower piston rod 33.

[0042] Embodiment 1 is a preferred embodiment of the present invention. Embodiment 2 is taken as an example to illustrate the working process of the present invention.

[0043] Step 1: Turn on the main power switch 105, prepare a unit holographic image working plate of moderate thickness, cut a suitable working plate with a cutting machine according to the pre-made platemaking head 84, stick it horizontally on the platemaking head 84 using the positioning groove, and then load the platemaking head 84 to the lower end of the heating plate 83; set an appropriate temperature through the temperature setting on the main control system and the display screen 106, and the heating plate 83 starts heating.

[0044] Step 2: Take a plate-making substrate test piece and fix it on the lower top steel platform 2. The plate-making application in the computer in the main control system moves the mobile platform along the ball screw to the top of the test piece, and adjusts the hydraulic pressure regulator 103 and the pressure test key 104 to the appropriate pressure. Press the test pressure key, the automatic cleaning device starts, the solenoid valve 93 opens, and the jet port 91 sprays nitrogen to clean the dust on the surface of the test piece. The solenoid valve 93 is closed, the cleaning is completed, and the hydraulic pump starts to output pressure. The upper piston rod 32 in the mobile platform moves upward relative to the hydraulic cylinder 31 and finally hits the upper top steel platform 1. The lower piston rod 33 runs downward until the plate-making head 84 prints the test piece and maintains the pressure for the set pressure holding time. After the grooves of the working plate on the plate-making head 84 are completely transferred to the test piece, the hydraulic pump stops outputting pressure, and the plate-making head 84 is lifted and reset to the initial position under the action of the reset spring 35, etc. The upper piston rod 32 also returns to the initial position under the action of gravity, completing the transfer of an image. Repeat the transfer of several images according to the required spacing. Remove the mobile platform and observe the transfer of the holographic image on the test piece. The level of the image can be adjusted by the level adjustment screw 36, and the pressure and temperature can be adjusted until a holographic image with a level, bright and uniform image and a light edge mark is printed on the test piece.

[0045] Step 3: Remove the test piece, clean the table, load the required imposition substrate 6, fix it on the lower top steel platform 2, close the transparent door 72, form an independent space inside the imposition system, preset the data on the computer, press the start button, and the imposition system starts working until the entire imposition process is completed, and finally a wide-format holographic master is obtained.

[0046] Step 4: Using the silver plating technology and electroforming technology well known in the holographic industry, the wide-format holographic master obtained above is made into a wide-format holographic metal master and a working plate.

[0047] The mobile platform includes a single-column hydraulic press body and a plate-making component fixed to the lower end of the single-column hydraulic press body. The single-column hydraulic press body is movably suspended on the upper steel platform. The motion component is connected to the single-column hydraulic press body and can drive the single-column hydraulic press body to move along mutually perpendicular X-axis and Y-axis. The lower steel platform is used to fix the plate-making substrate. When the single-column hydraulic press body is started, the plate-making component can be driven to move downward and press toward the plate-making substrate.

[0048] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A platemaking system for wide-area laser holographic master production, characterized by: It includes an upper steel platform and a lower steel platform which are arranged relatively up and down, and also includes a moving platform and a motion component. The moving platform includes a single-column hydraulic press body and a plate-making component fixed to the lower end of the single-column hydraulic press body. The single-column hydraulic press body is movably suspended above the lower steel platform. The motion component is connected to the single-column hydraulic press body and can drive the single-column hydraulic press body to move along the mutually perpendicular X-axis and Y-axis. The lower steel platform is used to fix the plate-making substrate. When the single-column hydraulic press body is started, the plate-making component can be driven to move downward and press toward the plate-making substrate. The plate-making system further includes an automatic cleaning device, which includes an air jet, an air tank, and an air pipe connecting the air jet and the air tank, the air pipe is provided with an electromagnetic valve for controlling the air outlet and a pressure regulating valve for adjusting the wind force, the air jet is fixed to the mobile platform and faces the plate-making substrate, and is used to clean the plate-making substrate and reduce the temperature of the surface of the plate-making substrate; The area between the upper steel platform and the lower steel platform is a working area, the mobile platform and the motion components are both located in the working area, dust barriers are arranged around the working area, the dust barriers make the working area form a closed space, including support columns for supporting the upper steel platform and the lower steel platform and transparent windows and transparent doors embedded between the support columns, an illumination light source is installed in the working area, the illumination light source is arranged opposite to the transparent door, and the illumination light source is closer to the upper steel platform than the upper steel platform; The motion assembly includes a mounting plate, an X-axis guide rail fixed to the upper steel platform, and a Y-axis guide rail arranged on the mounting plate, the mounting plate can move along the X-axis guide rail, and the single-column hydraulic press body can move along the Y-axis guide rail on the mounting plate; the motion assembly also includes an X-axis ball screw, a Y-axis ball screw, and a servo motor for driving the X-axis ball screw and the Y-axis ball screw to rotate respectively, the X-axis ball screw is connected to the mounting plate to drive it to move along the X-axis guide rail, and the Y-axis ball screw is connected to the single-column hydraulic press body to drive it to move along the Y-axis guide rail; The main body of the single-column hydraulic press includes a hydraulic cylinder, a cantilever and a lower piston rod. The cantilever is connected to the upper end of the hydraulic cylinder and the mounting plate. The upper end of the lower piston rod is slidable up and down in the hydraulic cylinder. The lower end of the lower piston rod is connected to the plate assembly. The hydraulic cylinder is connected to a hydraulic pump. The lower piston rod can move up and down as the hydraulic pump pumps oil into or out of the hydraulic cylinder.

2. The platemaking system for wide-surface laser holographic master production according to claim 1, characterized in that: The cantilever is an upper piston rod, the lower end of which can slide up and down in the hydraulic cylinder, and the upper end of which is a free end that can freely pass through the mounting plate. When hydraulic oil is pumped into the hydraulic cylinder, the free end of the upper piston rod can move upward and press against the upper steel platform.

3. The platemaking system for wide-surface laser holographic master production according to claim 2, characterized in that: The single-column hydraulic press body also includes a displacement plate, the hydraulic cylinder is fixed to the mounting plate, the displacement plate is fixed to the lower piston rod and can move up and down with the plate assembly, and a plurality of return springs connect the displacement plate and the mounting plate.

4. The platemaking system for wide-area laser holographic master production according to claim 3, characterized in that: The displacement plate is located at the lower side of the hydraulic cylinder, and a plurality of limit springs are connected between the plate assembly and the displacement plate. The plurality of limit springs are evenly arranged around the lower piston rod.

5. The platemaking system for wide-surface laser holographic master production according to claim 3, characterized in that: Two horizontal adjustment screws are arranged at opposite ends of the displacement plate along the X-axis direction. The end of the lower piston rod is a rotating unit with a micro-ball head. The horizontal adjustment screws can adjust the rotating unit to tilt by 0° to 10°.

6. The platemaking system for wide-surface laser holographic master production according to claim 1, characterized in that: The platemaking assembly includes, from top to bottom, a base, a heat-insulating plate, a heating plate with a thermistor, and a detachable platemaking head. The lower piston rod is connected to the upper end of the base. When the lower top steel platform fixes the platemaking substrate, the platemaking substrate is fixed tightly against the lower top steel platform.

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