A luggage printing stable fixing device and printing method

Abstract

The present application relates to the technical field of luggage printing, and specifically relates to a luggage printing stable fixing device and a printing method, which comprises a base, two connecting seats are vertically and slidably connected to the base, a spring three is arranged between each connecting seat and the base, a floating placement plate is detachably connected to the top surfaces of the two connecting seats, two symmetrically distributed guide rods one are fixedly connected to the base, controlled lifting mounting columns are sleeved on the guide rods one, a positioning piece is arranged between the bottoms of the two mounting columns, a screen printing frame above the floating placement plate is embeddedly and slidably connected to the positioning piece, a shielding cover is connected between the tops of the two mounting columns, and an automatic reversing ink scraping mechanism is arranged at the bottom of the shielding cover. The automatic reversing ink scraping mechanism replaces manual handheld scraping plate operation, realizes automatic uniform-speed scraping and printing and automatic reversing back-and-forth printing, solves the problems of low printing precision, poor stability and low efficiency of manual printing, and improves the automation level and product quality consistency of luggage screen printing processing.

Description

Technical Field

[0001] This invention relates to the field of bag printing technology, specifically to a bag printing stabilizing and fixing device and printing method. Background Technology

[0002] Screen printing, also known as silkscreen printing, is a common surface decoration and labeling printing process in the bag and leather goods industry. It is widely applicable to various leather substrates such as PU artificial leather, PVC artificial leather, and genuine leather. This process uses a customized screen printing plate and a squeegee to force ink through pre-set patterns and text holes on the screen, precisely transferring it to the surface of the bag or leather piece. This creates printed content such as logos, patterns, size parameters, and safety warning labels. It boasts advantages such as good forming effect, wide compatibility with various leather materials, high color saturation, and low cost, making it the most widely used printing processing method in bag and leather goods production.

[0003] Currently, traditional leather bag screen printing processing mostly relies on manual operation, and the overall processing flow is cumbersome: before the operation, the surface of the leather bag or leather piece to be printed must be cleaned manually to remove surface oil, dust and impurities to ensure that the printing base is clean; then, a suitable leather-specific screen printing ink is selected, the screen and the leather printing position are manually aligned and the screen spacing is adjusted; then, the ink is poured onto one end of the screen, and the operator holds a squeegee to maintain a fixed tilt angle and pressing pressure to scrape the screen surface at a uniform speed, so that the ink can pass through the mesh and adhere to the leather surface; finally, the screen is lifted to complete a single screen printing operation.

[0004] Traditional manual screen printing has many inherent defects: it is difficult for manual hand-held squeegees to maintain constant pressure, tilt angle and moving speed throughout the process, which easily leads to uneven squeegee force and unstable speed, resulting in quality defects such as uneven printing thickness, blurry patterns, edge burrs, missing prints and ink accumulation. At the same time, for processes that require bidirectional squeegee printing and re-printing, manual hand-held squeegee printing is required to repeatedly change direction, reset and reprint, which is cumbersome, labor-intensive and time-consuming.

[0005] To address the aforementioned issues, there is an urgent need to develop a stable fixing device and printing method for bag printing. This equipment features an automatic reversing squeegee mechanism that replaces manual hand-held squeegee operation, enabling automatic uniform speed squeegee printing and automatic reversing printing. This solves the problems of low precision, poor stability, and low efficiency in manual printing, thereby improving the automation level and product quality consistency of bag screen printing. Summary of the Invention

[0006] In response to the problems raised in the background art, the present invention provides a stable fixing device and printing method for printing bags and luggage to solve these problems. The present invention will be further described below.

[0007] A stable fixing device for printing on bags includes a base with two vertically sliding connecting seats on the base. A spring is provided between each connecting seat and the base. A floating placement plate is detachably connected to the top surface of the two connecting seats. Two symmetrically distributed guide rods are fixed to the base. A controlled lifting mounting column is sleeved on the guide rod. An alignment component is installed between the bottom of the two mounting columns. A screen printing frame located above the floating placement plate is embedded in the alignment component. A shield is transferred between the top of the two mounting columns. An automatic reversing ink scraping mechanism is provided at the bottom of the shield.

[0008] Preferably, the automatic reversing ink scraping mechanism includes an electric slide rail on the bottom surface of the shield, a bracket mounted on the mounting column, a guide rod two mounted on the bracket, a slider slidably connected to the guide rod two, a movable mounting frame detachably connected between the two sliders, a support wheel rotatably connected to the top of the movable mounting frame, the support wheel slidably connected to the electric slide rail at the bottom of the shield, and an inclined push plate at the bottom of the movable mounting frame, the working end of the push plate being tightly fitted to the screen printing frame mesh.

[0009] Preferably, a guide frame is installed on the mounting column below the bracket, and the rear end of the guide frame is detachably connected to the rear end of the adjacent bracket.

[0010] Preferably, the guide frame is a hollow frame structure. Guide blocks are fixed at both the front and rear ends of the guide frame's inner cavity, and a one-way rotating plate is connected to the working end of each guide block. The movable mounting frame has two symmetrically distributed vertical slots, and a rotating shaft slides through both slots. The rotating shaft is connected to a push plate key. A slotted sleeve is connected to the middle of the rotating shaft, and a sliding rod is fixed to the slotted sleeve. The sliding rod slides through the movable mounting frame. A spring is wound around the sliding rod between the movable mounting frame and the slotted sleeve. Rollers and gears are keyed to both ends of the rotating shaft. The rollers slide through the adjacent inner cavity of the movable mounting frame. Inverted racks are fixed to both the front and rear ends of the guide frame's inner cavity, and the racks mesh with gears for transmission.

[0011] Preferably, a hydraulic cylinder is installed on the front side of the base, and the output shaft of the hydraulic cylinder is keyed to the side of the alignment component. A rotating rod is connected to the front end of the floating placement plate. A gear is keyed to the rotating rod. A rotating rod is connected between the two connecting seats. A gear is keyed to the rotating rod and gear 2. Gear 2 and gear 1 are connected by a transmission belt. A vertically arranged transmission rack is fixed to the base. The transmission rack and gear 3 mesh. A reciprocating screw is keyed to both ends of the rotating rod. A moving part is threaded to the reciprocating screw. An external support is installed on the outside of the moving part. A telescopic rod is installed on the outside of the external support. A support plate is fixed to the telescopic end of the telescopic rod. A spring is sleeved on the telescopic rod between the support plate and the external support.

[0012] A method for printing on bags, the specific steps of which are as follows:

[0013] Step 1: Initially, the support plate is in an inward-folding state, the floating placement plate has the smallest unfolded area, which is convenient for material nesting, the screen printing frame is in a high-level suspended state, and does not contact the leather bag. At the same time, the push plate of the automatic reversing ink scraping mechanism is in a standby position in front of the screen printing frame, and the entire equipment is in a state of non-interference material feeding.

[0014] Step 2: Place the bag or leather product to be processed onto the outside of the floating placement plate and support plate, so that the end of the bag to be printed is flat and facing upwards. Then push the screen printing frame in from the side of the alignment piece to complete the precise alignment and installation.

[0015] Step 3: Start the hydraulic cylinder. The hydraulic cylinder drives the alignment component, mounting column, and screen printing frame to move down as a whole, so that the screen printing frame fits and presses against the surface of the bag. During the pressing process, the floating placement plate is squeezed, which drives the connecting seats on both sides to move down. Spring 3 is compressed. The moving connecting seats drive rotating rod 2 and gear 3 to rotate along the transmission rack. In sequence, through gear 2, transmission belt, and gear 1, rotating rod 1 and reciprocating screw rotate, driving the moving parts on both sides, the outer support, and the telescopic rod to drive the support plate to expand outward synchronously, stretching the bag horizontally and evenly to completely eliminate surface wrinkles and ensure that the printing base is flat and tight.

[0016] Step 4: Manually pour leather-specific screen printing ink onto the front of the screen printing frame, start the electric slide rail at the bottom of the shield, drive the moving mounting frame and the tilted push plate to move backward at a constant speed, complete the positive constant pressure and uniform speed scraping. When it moves to the rear position of the guide frame, the roller is guided by the guide block, the unidirectional rotating plate is raised, the push plate is suspended to avoid the position, the four meshing gears at the rear rack realize the automatic flipping and reversal, then the equipment returns to the front, the push plate is pressed down to reset and tilts in the opposite direction to scrape, and moves to the front position to automatically reverse again. This cycle is repeated many times to complete the high-precision and high-uniformity screen printing operation.

[0017] Step 5: After the screen printing process is completed, the hydraulic cylinder is controlled to retract and lift, the screen printing frame moves upward to release the downward pressure limit, the spring three rebounds and drives the connecting seat and floating placement plate to move upward and reset as a whole, the gear three moves upward and meshes with the transmission rack in the opposite direction, driving the reciprocating screw to reverse, the support plate automatically retracts inward and resets, the equipment returns to the initial standby state, and the staff can quickly remove the finished leather bags and carry out the next batch of clamping and printing operations.

[0018] Beneficial effects: This device consists of an electric slide rail, supporting wheels, a movable mounting frame, a push plate, a guide frame, a guide block, a one-way rotating plate, a rack, four gears, a rotating shaft, and two springs, forming a purely mechanical automatic reversing squeegee mechanism. It replaces the traditional manual hand-held squeegee operation, ensuring uniform travel speed, constant squeegee pressure, and uniform tilt angle throughout the entire process. This solves the problems of uneven printing force, unstable speed, and large thickness and color differences in finished products caused by manual printing. At the same time, it can automatically complete the push plate lifting and avoidance, rotation reversal, and pressing and resetting actions at the front and rear travel endpoints without the need for separate motor control of flipping. It has strong structural linkage, low failure rate, and high degree of automation, achieving effective squeegeeing in both directions, meeting the needs of multiple overprinting processes, and making the pattern formation fuller and more complete.

[0019] A vertical linkage transmission system is formed by a transmission rack, gear three, rotating rod two, gear two, transmission belt, gear one, and rotating rod one. Utilizing the vertical displacement of the floating placement plate pressing down and resetting as the power source, the reciprocating screw can achieve forward and reverse rotation without the need for additional drive components. The reciprocating screw, moving parts, external support parts, telescopic rod, support plate, and spring one form an adaptive external support tensioning structure, which can automatically stretch and flatten the leather bag laterally before printing, eliminating problems such as looseness, wrinkles, and bulges, and fundamentally preventing printing defects such as pattern deformation, missing prints, and ghosting caused by wrinkles. At the same time, spring one has elastic compensation capabilities and can adaptively tighten, avoiding the stretching deformation and damage of the leather bag caused by rigid tension.

[0020] This device achieves a fully automated mechanical operation of "feeding, automatic tensioning, automatic uniform speed reversal printing, and automatic retraction and reset". The process is continuous, the operation is simple, and the manual intervention is minimal, which greatly reduces the intensity of manual labor and significantly improves the efficiency and consistency of bag screen printing. It is suitable for large-scale and standardized bag screen printing production conditions. Attached Figure Description

[0021] Figure 1 : A three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 : A schematic diagram of the structure of the guide rod, mounting post, alignment component, and other components of this invention;

[0023] Figure 3 : A structural schematic diagram of the connecting seat, floating placement plate, support plate, and other components of this invention;

[0024] Figure 4 : A structural schematic diagram of the external support, telescopic rod, support plate, and other components of this invention;

[0025] Figure 5 : A structural schematic diagram of the screen printing frame, movable mounting bracket, slider, and other components of this invention;

[0026] Figure 6: A schematic diagram of the structure of the rack, slotted sleeve, supporting wheel and other components of the present invention;

[0027] In the diagram: 1-Base, 2-Slider, 3-Connecting seat, 4-Floating placement plate, 5-Reciprocating lead screw, 6-Moving component, 7-Guide block, 8-Outer support component, 9-Telescopic rod, 10-Support plate, 11-Spring 1, 12-Gear 1, 13-Gear 2, 14-Transmission belt, 15-Gear 3, 16-Transmission rack, 17-Guide rod 1, 18-Mounting column, 19-Alignment component, 20-Silicone screen printing frame, 2 1-Hydraulic cylinder, 22-Vertical slot, 23-Moving mounting bracket, 24-Sliding rod, 25-Spring 2, 26-Rotating shaft, 27-Push plate, 28-Roller, 29-Gear 4, 30-Guide frame, 31-One-way rotating plate, 32-Rack, 33-Slotted sleeve, 34-Rotating rod 1, 35-Supporting rotating wheel, 36-Shielding cover, 37-Bracket, 38-Spring 3, 39-Guide rod 2, 40-Rotating rod 2. Detailed Implementation

[0028] Next, combine Figures 1-6 A specific embodiment of the present invention will be described in detail below.

[0029] refer to Figure 1 and Figure 2 A stable fixing device for printing on bags includes a base 1, on which two connecting seats 3 are vertically slidably connected. A spring 38 is provided between each connecting seat 3 and the base 1. A floating placement plate 4 is detachably connected to the top surface of the two connecting seats 3. The bags to be processed can be entirely fitted onto the outside of the floating placement plate 4, ensuring the end face to be screen-printed is flat and facing upwards. Two symmetrically distributed guide rods 17 are fixed to the base 1. Controlled lifting mounting columns 18 are sleeved on the guide rods 17. Alignment components 19 are installed between the bottoms of the two mounting columns 18. The alignment component 19 has an embedded sliding screen printing frame 20 located above the floating placement plate 4. The screen printing frame 20 can be inserted and removed from the side of the alignment component 19, which facilitates the replacement and alignment of the screen printing frame 20. A shield 36 is connected between the tops of the two mounting columns 18. The bottom of the shield 36 is equipped with an automatic reversing squeegee mechanism. The automatic reversing squeegee mechanism replaces the traditional manual hand-held squeegee operation, realizing uniform speed and constant pressure screen printing throughout the process. It effectively solves the problems of uneven pressure, unstable speed, cumbersome reversing, low printing accuracy, poor product consistency, and low production efficiency in manual printing.

[0030] refer to Figure 5 and Figure 6The automatic reversing ink scraping mechanism includes an electric slide rail on the bottom surface of the shield 36, a bracket 37 mounted on the mounting column 18, a guide rod 39 mounted on the bracket 37, a slider 2 slidably connected to the guide rod 39, a movable mounting frame 23 detachably connected between the two sliders 2, a support wheel 35 rotatably connected to the top of the movable mounting frame 23, the support wheel 35 slidably connected to the electric slide rail at the bottom of the shield 36, and the whole is driven to move laterally back and forth by the electric slide rail. The bottom of the movable mounting frame 23 is provided with an inclined push plate 27, the working end of the push plate 27 is closely attached to the screen printing frame 20, and is used to squeeze ink to complete the screen printing scraping operation.

[0031] In the initial state of the equipment, the bag or leather bag to be printed is placed on the surface of the floating placement plate 4. The screen printing frame 20 is pushed laterally into the alignment component 19 to achieve precise alignment. At this time, the movable mounting frame 23 and the push plate 27 are in the standby position in front of the screen printing frame 20. The operator can evenly pour leather-specific screen printing ink onto the front mesh surface of the screen printing frame 20. The electric slide rail is activated, driving the support roller 35 to slide backward at a uniform speed, which drives the movable mounting frame 23 and the tilted push plate 27 to move backward synchronously. The push plate 27 pushes and scrapes the ink at a constant angle and constant pressure at a uniform speed, so that the ink is evenly transferred through the screen pattern holes to the leather surface below, completing a single forward screen printing operation.

[0032] To ensure uniform ink application, full pattern formation, no missing prints, and no thickness deviations in screen printing, the screen printing process requires multiple back-and-forth scraping operations by the pusher plate 27 to achieve overprinting and re-printing. Therefore, the pusher plate 27 needs to automatically rotate and tilt during its return stroke to ensure effective ink scraping during both forward and reverse strokes. To meet this process requirement, this device is designed as follows.

[0033] refer to Figure 2 A guide frame 30 is installed on the mounting column 18, located below the bracket 37. The rear end of the guide frame 30 is detachably connected to the rear end of the adjacent bracket 37, thereby achieving the stability of the bracket 37 and the guide frame 30.

[0034] refer to Figure 6 The guide frame 30 adopts a hollow frame structure. The front and rear ends of the inner cavity of the guide frame 30 are fixed with oppositely arranged guide blocks 7. The working ends of the guide blocks 7 are all connected to a one-way rotating plate 31. The one-way rotating plate 31 can only be rotated upward in one direction and cannot be rotated downward, so that the guide blocks 7 and the one-way rotating plate 31 together form a one-way guide inclined surface structure, which is used to lift and guide the roller 28 to avoid positioning.

[0035] refer to Figure 6 and Figure 4The movable mounting frame 23 has two symmetrically distributed vertical slots 22, and a rotating shaft 26 is slidably connected in both vertical slots 22. The rotating shaft 26 is keyed to the push plate 27, which can synchronously drive the push plate 27 to rotate and change direction. A slotted sleeve 33 is slidably connected in the middle of the rotating shaft 26. A sliding rod 24 is fixedly connected to the slotted sleeve 33. The sliding rod 24 is slidably connected to the movable mounting frame 23. A second spring 25 is provided between the movable mounting frame 23 and the slotted sleeve 33 and is wound around the sliding rod 24. Under normal conditions, the pre-tightening force of the second spring 25 presses down on the slotted sleeve 33 and the rotating shaft 26, so that the lower end of the push plate 27 is always pressed tightly against the screen printing frame 20, ensuring constant printing pressure.

[0036] refer to Figure 3 and Figure 6 The left and right ends of the rotating shaft 26 are keyed with rollers 28 and gears 29. The rollers 28 are slidably connected to the inner cavity of the adjacent movable mounting frame 23. The front and rear ends of the inner cavity of the guide frame 30 are fixedly connected with inverted racks 32. The front and rear racks 32 can mesh with gears 29 respectively to provide power for the flipping and reversing of the push plate 27.

[0037] In the initial squeegee state, under the pre-tension of spring 25, the slotted sleeve 33 and the rotating shaft 26 are in a low position, and the push plate 27 maintains a fixed tilt angle to press the screen printing frame 20. The electric slide rail drives the support wheel 35 to move backward, which in turn drives the movable mounting frame 23, the rotating shaft 26, and the push plate 27 to move backward at a uniform speed, completing the forward uniform speed squeegee screen printing; during the movement, the roller 28 slides smoothly along the inner side of the movable mounting frame 23 until the gear 4 29 moves to the rear end position of the guide frame 30.

[0038] When roller 28 contacts the guide ramp formed by the rear one-way rotating plate 31 and the guide block 7, it is lifted by the pressure of the ramp. Roller 28, rotating shaft 26, slotted sleeve 33 and push plate 27 together overcome the elastic force of spring 25 and rise upward, so that push plate 27 is separated from the screen printing frame 20 and suspended in mid-air. At the same time, gear 4 29 moves upward and meshes with the rear rack 32. As the equipment continues to move backward, rack 32 drives gear 4 29 and rotating shaft 26 to rotate in a direction, causing the bottom push plate 27 to automatically flip and tilt, completing the automatic reversal of the ink scraping direction. At this time, spring 25 is compressed and deformed.

[0039] After the reversal is completed, the electric slide rail runs in the opposite direction, driving the support wheel 35 and the movable mounting frame 23 to move forward and back as a whole. During the return stroke, the roller 28 falls back along the rear one-way rotating plate 31, releasing the lifting limit. The spring 25 releases its elastic force and presses down to reset, driving the rotating shaft 26 and the push plate 27 after the reversal to move down synchronously, so that the push plate 27 presses the screen printing frame 20 screen surface again, scraping ink forward at a uniform speed in a reverse tilt state, realizing the return reverse screen printing operation.

[0040] When the mobile mounting frame 23 moves to the front end of the guide frame 30, the roller 28 contacts the guide ramp of the front one-way rotating plate 31 and the guide block 7 again, raising the roller 28, rotating shaft 26 and push plate 27 again. The gear 4 29 meshes with the front rack 32, driving the rotating shaft 26 and push plate 27 to automatically flip and change direction again, completing the second reversing action. This cycle repeats, achieving fully automatic, unmanned, uniform speed reciprocating squeegee printing and automatic reversing screen printing of the push plate 27. The squeegee printing pressure is constant throughout, the walking speed is uniform, and the tilt angle is standard. This solves the problems of cumbersome reversing, uneven speed, unstable pressure, and large color difference and thickness deviation in traditional manual screen printing, improving the accuracy of bag screen printing, the consistency of finished products, and production efficiency.

[0041] To ensure the complete, flat, and distortion-free formation of the screen-printed pattern, and to avoid defects such as missed printing, blurred printing, and pattern deformation caused by wrinkles on the leather bag surface, the bags and leather products to be processed, placed on the outside of the floating placement plate 4, must always remain flat and taut. Therefore, refer to... Figure 1 and Figure 3 and Figure 4 A hydraulic cylinder 21 is installed on the front side of the base 1. The output shaft of the hydraulic cylinder 21 is connected to the side key of the alignment component 19. The hydraulic cylinder 21 can drive the alignment component 19 to rise and fall vertically as a whole through extension and retraction, thereby synchronously driving the mounting column 18 and the screen printing frame 20 to move vertically, so as to realize the automatic falling and fitting of the screen printing frame 20 to the printing station and automatic lifting and resetting, thus meeting the requirements of automated alignment printing.

[0042] The floating placement plate 4 is connected to a rotating rod 34 at its front end. A gear 12 is keyed to the rotating rod 34. A rotating rod 40 is connected between the two connecting seats 3. A gear 15 and a gear 13 are keyed to the rotating rod 40. The gear 13 and the gear 12 are connected by a transmission belt 14. A vertically arranged transmission rack 16 is fixed to the base 1. The transmission rack 16 and the gear 15 are connected by a transmission belt 14.

[0043] Both ends of the rotating rod 34 are keyed to reciprocating screws 5. A moving part 6 is threaded onto the reciprocating screw 5. An outer support 8 is installed on the outside of the moving part 6. A telescopic rod 9 is installed on the outside of the outer support 8. A support plate 10 is fixed to the telescopic end of the telescopic rod 9. A spring 11 is provided between the support plate 10 and the outer support 8 and sleeved on the telescopic rod 9. The elastic preload of the spring 11 gives the support plate 10 an adaptive tension margin, ensuring a tight and stable fit without damaging the bag.

[0044] By simultaneously extending the left and right support plates 10 outwards, the leather products on the outside of the floating placement plate 4 can be stretched horizontally and evenly, making the leather products flat and extended as a whole, completely eliminating surface wrinkles, looseness, bulges and other problems, and providing a flat and tight processing base for the screen printing process.

[0045] In the initial standby state, the moving part 6 is at its inner limit position of the reciprocating screw 5, the support plate 10 retracts inward, and the floating placement plate 4 occupies the smallest area, making it easy for workers to quickly and smoothly attach the bags and leather products to be processed onto the floating placement plate 4 and the outer side of the support plate 10. At this time, the gear 3 15 is engaged at the top of the transmission rack 16, and the screen printing frame 20 is raised and suspended above the floating placement plate 4, without squeezing interference, facilitating loading, unloading, and assembly operations.

[0046] Once the material loading is complete and the screen printing frame 20 is aligned and installed, the hydraulic cylinder 21 is activated. The output shaft of the hydraulic cylinder 21 drives the alignment component 19, the mounting column 18, and the screen printing frame 20 to move vertically downwards in sync, so that the screen printing frame 20 can be smoothly pressed against the surface of the leather bag product to be printed below, and enter the screen printing operation station.

[0047] During the downward pressing of the screen printing frame 20, the floating placement plate 4 is squeezed, causing the floating placement plate 4 to be pressed and drive the two sets of connecting seats 3 on the left and right to slide downward synchronously. The spring 38 is compressed and stores energy. During the downward movement of the connecting seat 3, the rotating rod 40, gear 13 and gear 15 move downward as a whole. Gear 15 rotates vertically along the fixed transmission rack 16 and rotates in the forward direction.

[0048] Gear 3 15 drives rotating rod 2 40 and gear 2 13 to rotate synchronously. Gear 2 13 drives gear 1 12 and rotating rod 1 34 to rotate synchronously through transmission belt 14, which in turn drives the two sets of reciprocating screws 5 to rotate synchronously in the forward direction, driving the moving parts 6 on both sides to slide outward in a synchronous manner, and driving the outer support 8, telescopic rod 9 and support plate 10 to expand outward in a synchronous manner.

[0049] The two side support plates 10 expand outwards simultaneously, and with the elastic pre-tightening compensation of the spring 11, the leather bag is stretched and tightened laterally, so that the surface of the bag is completely flattened, eliminating loose wrinkles and ensuring that the screen printing base is flat and uniform. This provides a high-quality processing foundation for the subsequent uniform reciprocating screen printing operation of the automatic reversing ink scraping mechanism, effectively avoiding printing defects caused by wrinkles. After the bag is tightened in place, the automatic reversing ink scraping mechanism starts to reciprocate and scrape, completing the bag screen printing process.

[0050] After the screen printing process is completed, the hydraulic cylinder 21 retracts and resets, causing the alignment component 19, mounting column 18, and screen printing frame 20 to be lifted vertically as a whole, releasing the downward pressure restriction of the screen printing frame 20 on the floating placement plate 4. At this time, spring 38 releases its elastic potential energy, pushing the connecting seat 3 and the floating placement plate 4 to move upward and reset as a whole.

[0051] During the upward movement of the connecting seat 3, the rotating rod 40 and the gear 15 move upward synchronously. The gear 15 rotates in the opposite direction along the transmission rack 16, driving the rotating rod 40 and the gear 13 to rotate in the opposite direction. Through the transmission belt 14, the gear 12, the rotating rod 34 and the reciprocating screw 5 rotate in the opposite direction synchronously. This drives the left and right moving parts 6, the outer support parts 8, the telescopic rod 9 and the support plate 10 to retract and reset synchronously. The spring 11 returns to its original state, and the equipment returns to its initial retracted standby state, making it convenient to quickly remove the printed bags and proceed to the next round of work.

[0052] In summary, this device, composed of an electric slide rail, a support wheel 35, a movable mounting frame 23, a push plate 27, a guide frame 30, a guide block 7, a one-way rotating plate 31, a rack 32, a gear four 29, a rotating shaft 26, and a spring two 25, is a purely mechanical automatic reversing squeegee mechanism that replaces traditional manual hand-held squeegee operation. It maintains uniform travel speed, constant squeegee pressure, and consistent tilt angle throughout the entire process, solving the problems of uneven printing force, unstable speed, and large thickness and color differences in finished products caused by manual printing. Simultaneously, it can automatically complete the lifting, rotation, and resetting actions of the push plate 27 at the front and rear travel endpoints, eliminating the need for separate motor control of the flipping mechanism. The device features strong structural linkage, low failure rate, and high automation, enabling effective squeegeeing in both directions, meeting the requirements of multiple overprinting processes, and resulting in fuller and more complete patterns.

[0053] A vertical linkage transmission system is formed by transmission rack 16, gear 3 15, rotating rod 2 40, gear 2 13, transmission belt 14, gear 1 12, and rotating rod 1 34. The vertical displacement of the floating placement plate 4 pressing down and resetting is used as the power source. The reciprocating screw 5 can be rotated in both directions without the need for additional drive components. The reciprocating screw 5, moving part 6, external support part 8, telescopic rod 9, and support plate 10, together with spring 11, form an adaptive external support tensioning structure. It can automatically stretch and flatten the bag laterally before printing, eliminating problems such as looseness, wrinkles, and bulges in the bag. It can prevent printing defects such as pattern deformation, missing prints, and ghosting caused by wrinkles from the root. At the same time, spring 11 has elastic compensation capability and can adaptively tighten, avoiding the stretching deformation and damage of the bag caused by rigid tightening.

[0054] This device achieves a fully automated mechanical operation of "feeding, automatic tensioning, automatic uniform speed reversal printing, and automatic retraction and reset". The process is continuous, the operation is simple, and the manual intervention is minimal, which greatly reduces the intensity of manual labor and significantly improves the efficiency and consistency of bag screen printing. It is suitable for large-scale and standardized bag screen printing production conditions.

[0055] A method for printing on bags, the specific steps of which are as follows:

[0056] Step 1: Initially, the support plate 10 is in an inward-folding state, the floating placement plate 4 has the smallest unfolded area, which is convenient for material nesting, the screen printing frame 20 is in a high-level suspended state and does not contact the bag, and at the same time, the push plate 27 of the automatic reversing ink scraping mechanism is in a standby position in front of the screen printing frame 20, and the entire equipment is in a non-interference feeding state.

[0057] Step 2: Place the bag or leather product to be processed onto the outside of the floating placement plate 4 and the support plate 10, so that the end of the bag to be printed is flat and facing upwards. Then push the screen printing frame 20 into the alignment part 19 from the side to complete the precise alignment and installation.

[0058] Step 3: Start hydraulic cylinder 21. Hydraulic cylinder 21 drives the alignment component 19, mounting column 18, and screen printing frame 20 to move downward as a whole, so that the screen printing frame 20 fits and presses against the surface of the bag. During the downward pressing process, the floating placement plate 4 is squeezed, which drives the connecting seats 3 on both sides to move downward and the spring 38 to compress. The downward movement of the connecting seat 3 drives the rotating rod 40 and the gear 15 to mesh and rotate along the transmission rack 16. In turn, the rotating rod 34 and the reciprocating screw 5 are rotated through the gear 13, the transmission belt 14, and the gear 12, which drive the moving parts 6 on both sides, the outer support 8, and the telescopic rod 9 to drive the support plate 10 to expand outward synchronously, stretching and tightening the bag horizontally and evenly, completely eliminating surface wrinkles and ensuring that the printing base is flat and tight.

[0059] Step 4: Manually pour leather-specific screen printing ink onto the front end of the screen printing frame 20, start the electric slide rail at the bottom of the masking cover 36, drive the moving mounting frame 23 and the tilted push plate 27 to move backward at a uniform speed, complete the forward constant pressure and uniform speed scraping printing. When it moves to the rear end position of the guide frame 30, the roller 28 is lifted by the guide block 7 and the inclined surface of the one-way rotating plate 31, the push plate 27 is suspended to avoid the position, the gear 4 29 meshes with the rear rack 32 to realize automatic flipping and reversal of direction, then the equipment moves forward in the return stroke, the push plate 27 is pressed down to reset and tilts in the opposite direction to scrape, and moves to the front end position to automatically reverse direction again. This cycle is repeated many times to complete the high-precision and high-uniformity screen printing operation.

[0060] Step 5: After the screen printing process is completed, control the hydraulic cylinder 21 to retract and lift, the screen printing frame 20 to move upward and release the downward pressure limit, the spring 38 to rebound and drive the connecting seat 3 and the floating placement plate 4 to move upward and reset as a whole, the gear 3 15 to move upward and mesh with the transmission rack 16 in the opposite direction, drive the reciprocating screw 5 to reverse, the support plate 10 to automatically retract inward and reset, the equipment returns to the initial standby state, and the staff can quickly remove the finished leather bag and carry out the next batch of clamping and printing operations.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bag printing stabilizing and fixing device, comprising a base (1), characterized in that: Two connecting seats (3) are vertically slidably connected to the base (1). A spring three (38) is provided between each connecting seat (3) and the base (1). A floating placement plate (4) is detachably connected to the top surface of the two connecting seats (3). Two symmetrically distributed guide rods (17) are fixedly connected to the base (1). A controlled lifting mounting column (18) is sleeved on the guide rod (17). An alignment member (19) is installed between the bottom of the two mounting columns (18). A screen printing frame (20) located above the floating placement plate (4) is embedded and slidably connected to the alignment member (19). A shield (36) is connected between the top of the two mounting columns (18). An automatic reversing ink scraping mechanism is provided at the bottom of the shield (36).

2. The bag printing stabilizing and fixing device according to claim 1, characterized in that: The automatic reversing ink scraping mechanism includes an electric slide rail on the bottom surface of the shield (36), a bracket (37) on the mounting column (18), a guide rod (39) on the bracket (37), a slider (2) on the guide rod (39), a movable mounting frame (23) detachably connected between the two sliders (2), a support wheel (35) on the top of the movable mounting frame (23), the support wheel (35) slidingly connected to the electric slide rail at the bottom of the shield (36), and an inclined push plate (27) at the bottom of the movable mounting frame (23), the working end of the push plate (27) closely fitting the screen printing frame (20).

3. The bag printing stabilizing and fixing device according to claim 2, characterized in that: A guide frame (30) is installed on the mounting column (18) below the bracket (37), and the rear end of the guide frame (30) is detachably connected to the rear end of the adjacent bracket (37).

4. The bag printing stabilizing and fixing device according to claim 3, characterized in that: The guide frame (30) is a hollow frame structure. Guide blocks (7) are fixed at both the front and rear ends of the inner cavity of the guide frame (30). One-way rotating plates (31) are connected to the working ends of the guide blocks (7). Two symmetrically distributed vertical grooves (22) are opened on the movable mounting frame (23). A rotating shaft (26) slides within both vertical grooves (22). The rotating shaft (26) is keyed to the push plate (27). A slotted sleeve (33) is connected to the middle of the rotating shaft (26). A sliding rod is fixed to the slotted sleeve (33). 24), the sliding rod (24) and the movable mounting frame (23) are connected in a through-type sliding joint. A spring 2 (25) is provided between the movable mounting frame (23) and the slotted sleeve (33) and is wound around the sliding rod (24). Rollers (28) and gear 4 (29) are keyed to both ends of the rotating shaft (26). The rollers (28) and the inner cavity of the adjacent movable mounting frame (23) are slidably connected. The front end and rear end of the inner cavity of the guide frame (30) are fixedly connected to an inverted rack (32). The rack (32) and gear 4 (29) mesh and drive.

5. A bag printing stabilizing and fixing device according to any one of claims 1-4, characterized in that: A hydraulic cylinder (21) is installed on the front side of the base (1). The output shaft of the hydraulic cylinder (21) is connected to the side key of the alignment component (19). A rotating rod (34) is connected to the front end of the floating placement plate (4). A gear (12) is connected to the rotating rod (34) by a key. A rotating rod (40) is connected between the two connecting seats (3). A gear (15) and a gear (13) are connected to the rotating rod (40) by a key. The gear (13) and the gear (12) are connected by a transmission belt (14). The base ( 1) A vertically arranged transmission rack (16) is fixedly connected to the top. The transmission rack (16) and gear three (15) mesh and drive each other. Both ends of the rotating rod one (34) are keyed to a reciprocating screw (5). A moving part (6) is threadedly connected to the reciprocating screw (5). An outer support (8) is installed on the outside of the moving part (6). A telescopic rod (9) is installed on the outside of the outer support (8). A support plate (10) is fixedly connected to the telescopic end of the telescopic rod (9). A spring one (11) is sleeved on the telescopic rod (9) between the support plate (10) and the outer support (8).

6. A method for printing bags and luggage, employing the bag and luggage printing stabilizing and fixing device as described in claim 5, comprising the following steps: Step 1: Initially, the support plate (10) is in an inward-folding state, the floating placement plate (4) has the smallest unfolded area, which is convenient for material loading, the screen printing frame (20) is in a high-level suspended state and does not contact the bag, and at the same time the push plate (27) of the automatic reversing ink scraping mechanism stays in the standby position in front of the screen printing frame (20), and the whole equipment is in a non-interference loading state. Step 2: Place the bag or leather product to be processed on the outside of the floating placement plate (4) and the support plate (10), so that the end face of the bag to be printed is flat and facing upward. Then push the screen printing frame (20) from the side of the alignment piece (19) to complete the precise alignment and installation. Step 3: Start the hydraulic cylinder (21). The hydraulic cylinder (21) drives the alignment part (19), the mounting column (18), and the screen printing frame (20) to move down as a whole, so that the screen printing frame (20) fits and presses against the surface of the bag. During the pressing process, the floating placement plate (4) is squeezed, which drives the connecting seats (3) on both sides to move down. The spring three (38) is compressed, and the connecting seat (3) moves down, which drives the rotating rod two (40). The gear three (15) meshes and rotates along the transmission rack (16). It passes through the gear two (13), the transmission belt (14), and the gear one (12) in sequence, which drives the rotating rod one (34) and the reciprocating screw (5) to rotate, driving the moving parts (6) on both sides, the outer support (8), and the telescopic rod (9) to drive the support plate (10) to expand outward synchronously, stretching the bag horizontally and evenly, completely eliminating surface wrinkles, and ensuring that the printing base surface is flat and tight. Step 4: Manually pour leather-specific screen printing ink onto the front end of the screen printing frame (20), start the electric slide rail at the bottom of the shield (36), drive the moving mounting frame (23) and the inclined push plate (27) to move backward at a constant speed, complete the positive constant pressure and uniform speed scraping printing. When it moves to the rear end position of the guide frame (30), the roller (28) is guided by the guide block (7), the unidirectional rotating plate (31) is raised on the slope, the push plate (27) is suspended to avoid the position, the gear four (29) meshes with the rear rack (32) to realize automatic flipping and reversing direction, then the equipment moves forward in the return stroke, the push plate (27) is pressed down to reset and reverses the tilting scraping printing, moves to the front end position and automatically reverses direction again, repeating this cycle multiple times to complete the high-precision and high-uniformity screen printing operation; Step 5: After the screen printing process is completed, control the hydraulic cylinder (21) to retract and lift, the screen printing frame (20) moves upward to release the downward pressure limit, the spring three (38) rebounds and drives the connecting seat (3) and the floating placement plate (4) to move upward and reset as a whole, the gear three (15) moves upward and meshes with the transmission rack (16) in the opposite direction, drives the reciprocating screw (5) to reverse, the support plate (10) automatically retracts inward and resets, the equipment returns to the initial standby state, and the staff can quickly remove the finished leather bag and carry out the next batch of clamping and printing operations.

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