Automatic paper changing rod device for sheet-fed printing press

Abstract

The present invention discloses an automatic paper changing plug-in rod device for a sheet-fed printing press, comprising a frame, a plug-in chain assembly and a lifting assembly for controlling the lifting of the plug-in chain assembly to continuously supply paper to the sheet-fed printing press, the plug-in chain assembly is connected to the lifting assembly and is located above the paper feed table, when performing a paper changing operation, the plug-in chain assembly extends out and inserts into the bottom of a paper pile on the paper feed table, the paper pile is lifted by the plug-in chain assembly, and after a new paper pile is provided by the device and stacked with the paper pile on the plug-in chain assembly, the plug-in chain assembly is withdrawn and reset, the reset plug-in chain assembly is located above the paper feed table, when the plug-in chain assembly is reset, the other parts stand on one side of the paper feed table, it occupies a small space, and does not affect the normal operation of the equipment. While the paper changing operation is in progress, the lifting of the plug-in chain assembly is also controlled by the lifting assembly, such as: consistent with the lifting frequency of the paper feed table, so as to meet the normal paper supply of the printing press during the paper changing process, thereby ensuring the normal operation of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of printing, in particular to an automatic paper changing rod insertion device of a sheet-fed printing press. Background Art

[0002] The paper feeding method of the sheet-fed printing press is feeder delivery. Since the birth of sheet-fed offset printing technology, paper loading and paper changing have always been done manually. In order to ensure that the upper and lower paper piles can be seamlessly connected without stopping the operation when changing the paper pile, the existing sheet-fed printing press non-stop paper feeding device is usually completed by the rod insertion method, that is, relying on manual insertion of several rods into the insertion holes of the special paper holding bottom plate to form a spaced rod row (the two ends of the rod row are placed on the cross bar / rod rack driven by the lifting chain) to support the bottom of the upper paper pile to continue to rise for continuous paper feeding, and then take out the paper holding bottom plate and push it into the paper holding bottom plate with the lower paper pile; after the lower paper pile rises to contact with the rods of the upper paper pile, the rods are pulled out one by one to achieve the connection between the upper and lower paper piles, thereby completing the paper changing work without stopping the machine.

[0003] Usually, when the equipment is stable, the printing speed is not less than 12,000 sheets / hour, and a bottom paper pile generally holds about 3,000 sheets of paper, and the printing time of a bottom paper pile is about 0.25 hours. Each time the paper is changed, the time for inserting and pulling the rod is about 3 minutes. Therefore, for the current non-stop paper changing device of the single-sheet printing press, the paper changing and inserting rod operation is frequent, cumbersome, time-consuming and labor-intensive. In order to better fit the intelligent manufacturing model of the Industrial 4.0 era, automatic non-stop paper changing has become an important and indispensable link in realizing the automated operation of the printing press, so it is imperative to provide a fully automatic paper changing and inserting rod device. In addition, every time the paper is changed, there is a problem of dirtying the surface of the printed product in the process of pulling the inserting rod out from the middle of the upper and lower paper piles. How to design and provide a paper changing inserting rod that can avoid the dirtying of the printed product surface caused by the extraction process is also a problem that needs to be solved urgently.

[0004] If you want to achieve full automation of paper loading and paper changing without stopping the machine, the first step in the technical solution is to solve the problem of paper changing rod operation. The most feasible method is the rod insertion robot, and its ideal behavior is to be integrated with the printing machine as a whole to avoid being an outsider. In addition, in order to ensure the accuracy of printing operations, it is necessary to use a static operation mode for operation. Accordingly, the invention patent with the authorization announcement number CN106335804A discloses a fully automatic paper changing rod device for an offset printing press, and the paper loading and changing work process is as follows: ① Pre-insertion of rods: the fully automatic paper changing rod device is arranged on the top of the upper paper rack of the printing press. When the paper loading and changing work is performed, it is driven by the control motor to turn 90° clockwise. At this time, the retractable motor turns the rectangular frame (with a rod push plate, a rod row, a rod hole plate and a rod moving screw, etc.) to the horizontal; ② Rod insertion: when the paper pile rises to the same height as the rod, the rod motor starts to rotate the left and right rod moving screws, driving the rod push plate and the rod row to move forward, and inserting them along the insertion hole of the paper bottom plate to support the upper paper pile; ③ Rod retracting: the lower paper pile rises to dock with the upper paper pile, the rod row retreats into the rectangular frame, the retractable motor reverses the rectangular frame 90°, and the control motor drives the device to continue to reverse 90° and return to its original position. Although the paper changing rod device can realize fully automatic paper changing operations, the rectangular frame and other devices need to be arranged on the outside of the paper supply table. When changing paper, the rectangular frame and the left and right rod moving screws are large in size, and the space occupied during the retracting and releasing of the device is large; in addition, the rod arrangement of the device described in the technical solution is in the process of being pulled out from between the upper and lower paper piles, and the problem of friction and scratching the surface of the paper in the lower paper pile or the surface of the printed semi-finished product cannot be effectively avoided.

[0005] Therefore the prior art still needs to be improved and enhanced. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an automatic paper changing rod insertion device for a sheet-fed printing press, which can automatically complete the paper changing operation.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] An automatic paper changing plug-in rod device for a sheet-fed printing press comprises a frame, on which a plug-in chain assembly is provided for extending to lift a paper pile on a paper feeding table of the sheet-fed printing press and resetting the paper pile so that the paper pile is stacked with a paper pile to be replaced, and a lifting assembly for controlling the lifting of the plug-in chain assembly to continuously supply paper to the sheet-fed printing press. The plug-in chain assembly is connected to the lifting assembly, and the reset end of the plug-in chain assembly is located above the paper feeding table.

[0009] In the automatic paper changing and inserting rod device of the sheet-fed printing press, the inserting chain assembly includes a plurality of rigid chains, a control slider, a reset mechanism and a rotating component. One end of the rigid chain is connected to the control slider, the reset mechanism is connected to the control slider to drive the control slider to reset, and the rotating component is connected to the rigid chain to drive the rigid chain to extend and hold up the paper pile.

[0010] In the automatic paper changing rod device of the sheet-fed printing press, the other end of the rigid chain is provided with a pointed plug-in portion for inserting into the groove on the paper pile rack of the paper feed table. When the plug-in chain assembly is reset, the pointed plug-in portion serves as a limiting portion when the rigid chain is reset.

[0011] In the automatic paper changing rod device of the sheet-fed printing press, the chain assembly also includes a ventilation hose arranged in the rigid chain, the ventilation hose is provided with a plurality of ventilation holes staggered on both sides of the rigid chain, air cushion beads are provided in the ventilation holes at the bottom, and a spring is provided in the ventilation hose to prevent it from being blocked when bent, one end of the ventilation hose is connected to the control slider, and the other end of the ventilation hose is a closed end and is connected to the other end of the rigid chain.

[0012] In the automatic paper changing and inserting rod device of the sheet-fed printing press, the inserting chain assembly also includes an upper horizontal axis, a middle horizontal axis and a lower horizontal axis, and gears are arranged on the upper horizontal axis, the middle horizontal axis and the lower horizontal axis, and the rigid chain is meshed with each gear. The middle horizontal axis extends out of the frame and is arranged at a preset angle with the upper horizontal axis and the lower horizontal axis. The reset mechanism is connected to the control slider to drive the control slider to reset, and the rotating member is connected to the lower horizontal axis to drive the lower horizontal axis to rotate.

[0013] In the automatic paper changing and inserting rod device of the sheet-fed printing press, the inserting chain assembly also includes a gear housing, which is covered on the gear, and a lower horizontal axis extends from its lower part to support the rigid chain. The upper and lower parts of the gear housing have through holes for the rigid chain to extend out.

[0014] In the automatic paper changing and insertion rod device of the sheet-fed printing press, the rigid chain includes a plurality of chain units, and the chain units include an inner chain plate, an outer chain plate, a pin, a first chain plate and a second chain plate. One end of the first chain plate is rotatably connected to the previous outer chain plate and one end of the previous inner chain plate through a pin, and the other end of the first chain plate is rotatably connected to the other end of the next outer chain plate, the other end of the next inner chain plate and the second chain plate through a pin. The bottom of the second chain plate extends to the middle of the next first chain plate and abuts against the next first chain plate. The bottom of the first chain plate extends to the middle of the next outer chain plate and abuts against the next second chain plate.

[0015] In the automatic paper changing and insertion rod device of the sheet-fed printing press, the first chain plate includes a first mounting portion, an extension portion of the second mounting portion located at the lower side of the first mounting portion, and a supporting recess located at one side of the extension portion, and the extension portion extends out of the outside of the first mounting portion; the second chain plate includes a third mounting portion, an abutment portion located at the lower side of the third mounting portion, and an abutment recess, and the abutment portion extends out of the outside of the third mounting portion, and the extension portion and / or the abutment portion have a through hole for exposing the air cushion beads.

[0016] In the automatic paper changing and insertion rod device of the sheet-fed printing press, the rigid chain includes an inner chain plate, an outer chain plate pin and a supporting chain plate, one end of the supporting chain plate is connected to the previous inner chain plate and the outer chain plate through a pin, and the other end of the supporting chain plate is connected to the next inner chain plate and the outer chain plate through a pin, the supporting chain plate extends to the middle part of the previous outer chain plate and abuts against the previous chain plate, and the supporting chain plate has a through hole for exposing the air cushion beads.

[0017] In the automatic paper changing and inserting rod device of the sheet-fed printing press, the inner chain piece and the outer chain piece both extend inwards and have supporting parts, and there is a gap between the two supporting parts for the gear to pass through.

[0018] Compared with the prior art, the automatic paper changing rod device of the sheet-fed printing press provided by the present invention adopts a chain plug assembly to replace the existing rod plug assembly to realize automatic paper changing operation. When the paper changing operation is performed, the chain plug assembly extends and inserts into the bottom of the paper pile on the paper feeding table. At this time, the paper feeding table descends, and the paper pile is lifted by the chain plug assembly. When the new paper pile is provided by the device and stacked with the paper pile on the chain plug assembly, the chain plug assembly is pulled out and reset, and the paper changing operation is completed. The reset chain plug assembly is located above the paper feeding table, and only a small part of it stands upright on the side of the paper feeding table, so that it does not affect the normal operation of the equipment and occupies a small space. While the paper changing operation is in progress, the lifting and lowering of the chain plug assembly is also controlled by the lifting assembly, such as: consistent with the lifting frequency of the paper feeding table, so as to meet the normal paper supply of the printing press during the paper changing process, thereby ensuring the normal operation of the equipment. In addition, the present invention has a simple structure and can realize automatic paper changing operation to improve the intelligence of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic structural diagram of the rigid chain of the automatic paper changing rod insertion device of the sheet-fed printing press when the rigid chain is extended.

[0020] Figure 2 The present invention is a schematic structural diagram of the rigid chain of the automatic paper changing and inserting rod device of the sheet-fed printing press after it is reset.

[0021] Figure 3 A schematic diagram of the meshing of a rigid chain and a gear of an automatic paper changing and inserting rod device of a sheet-fed printing press provided by the present invention.

[0022] Figure 4 A schematic structural diagram of a gear housing of an automatic paper changing and inserting rod device of a sheet-fed printing press provided by the present invention.

[0023] Figure 5 The present invention is a schematic cross-sectional structure diagram of a part of the rigid chain of the automatic paper changing and inserting rod device of the sheet-fed printing press provided by the present invention.

[0024] Figure 6 A schematic side structural diagram of a portion of a rigid chain of an automatic paper changing and inserting rod device of a sheet-fed printing press provided by the present invention.

[0025] Figure 7 A schematic diagram of the exploded structure of a portion of a rigid chain in an embodiment of an automatic paper changing rod insertion device for a sheet-fed printing press provided by the present invention.

[0026] Figure 8 A schematic diagram of the side structure of a portion of a rigid chain in another embodiment of the automatic paper changing and inserting rod device of a sheet-fed printing press provided by the present invention.

[0027] Fig. 9 A schematic top view of the structure of a portion of a rigid chain of an automatic paper changing and inserting rod device of a sheet-fed printing press provided by the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] It should be noted that when a component is referred to as being "mounted on", "fixed on" or "disposed on" another component, it may be directly on the other component or there may be a central component at the same time. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time.

[0030] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of the present invention are merely relative concepts or are based on the normal use status of the product and should not be considered as restrictive.

[0031] The automatic paper changing rod device of the sheet-fed printing press provided by the present invention is located above the paper feeding table of the sheet-fed printing press (such as the Heidelberg offset printing press). Figure 1 , Figure 2 , Figure 3 and Figure 4 The automatic paper changing rod insertion device comprises a frame 1, on which a chain insertion assembly 2 and a lifting assembly 3 are arranged.

[0032] The plug-in chain assembly 2 is used to extend and hold up the paper pile on the paper feed table of the sheet-fed printing press, and reset the paper pile to stack with the paper pile to be replaced. The lifting assembly 3 adopts a linear slide rail structure, which is used to control the lifting of the plug-in chain assembly 2 to continuously supply paper to the sheet-fed printing press, thereby realizing continuous paper supply without stopping. The plug-in chain assembly 2 is connected to the lifting assembly 3, and the reset end of the plug-in chain assembly is located above the paper feed table. When the plug-in chain assembly is reset, the other parts stand on one side of the paper feed table, and it occupies a small space.

[0033] Optionally, the chain assembly is slidably connected to the lifting assembly. When performing a paper changing operation, the chain assembly 2 slides to the right to extend its lower part and insert it into the bottom of the paper pile on the paper feed table. The sheet-fed printing press then lowers the paper feed table and holds up the paper pile. When a new paper pile is provided by the sheet-fed printing press equipment and stacked with the paper pile on the chain assembly 2, the chain assembly 2 is pulled out and reset to complete the paper changing operation. After the reset chain assembly 2 is located above the paper feed table, only a small part of it stands upright on the side of the paper feed table, so that it does not affect the normal operation of the equipment and occupies a small space. After the chain assembly 2 is reset, the lifting assembly 3 simultaneously descends and resets, so that the chain assembly 2 is located at the initial position of the operation, so as to facilitate the next paper changing operation, and repeat this process.

[0034] Furthermore, while changing paper, the lifting component 3 controls the lifting of the plug chain component 2, such as being consistent with the lifting frequency of the paper feed table, to ensure normal paper supply of the printing press during the paper changing process, thereby ensuring that the equipment can run without stopping while changing paper.

[0035] The insert chain assembly 2 includes a plurality of rigid chains 21, a control slider 22, a reset mechanism (not shown in the figure) and a rotating member (not shown in the figure). One end of the rigid chain 21 is connected to the control slider 22. The reset mechanism can be a servo motor or a cylinder, and its running part is connected to the control slider 22 to drive the control slider 22 to reset, thereby driving the rigid chain 21 to reset. The rotating member can be a stepping motor, which is connected to the rigid chain 21, drives the rigid chain 21 to extend from the lower part of the paper feed table to hold up the paper pile, and inserts the rigid chain 21 into the bottom of the paper pile through the rotating member. The rigid chain 21 acts as a plug rod to hold up the paper pile. When the paper changing action is completed, the reset mechanism is started to reset the rigid chain 21. In this embodiment, the number of the rigid chains 21 is at least 3, and multiple chains can be selected according to the size of the paper to reduce the load-bearing of a single rigid chain 21 and make the paper less likely to deform.

[0036] The other end of the rigid chain 21 is provided with a pointed plug-in portion 23 for inserting into a groove on a paper pile rack (not shown) of a paper feeding station, which plays a guiding role when inserting into the groove, so that the rigid chain 21 can be smoothly and quickly inserted into the groove.

[0037] Furthermore, when the plug chain assembly is reset, the pointed plug-in portion 23 can also serve as a limit portion when the rigid chain 21 is reset, that is, when the rigid chain 21 is reset, it prevents the rigid chain 21 from moving up excessively and causing the rigid chain 21 to fall out.

[0038] Please also read Figure 5 The plug-in chain assembly 2 also includes a ventilation hose 24 arranged in the rigid chain 21. The ventilation hose 24 is located on both sides of the rigid chain 21 and has a plurality of ventilation holes 241 staggered thereon. Air cushion beads 242 are arranged in the ventilation holes 241 at the bottom. The ventilation hose 24 is provided with a spring 243 to prevent it from being blocked when bent. One end of the ventilation hose 24 is connected to the control slider 22, and the other end of the ventilation hose 24 is a closed end and is connected to the other end of the rigid chain 21. The control slider 22 is connected to the fan device to allow ventilation inside the ventilation hose 24.

[0039] In this embodiment, the control slider 22 is provided with a vent hole (not shown in the figure), which is connected to an external blower or blower fan. The external blower or blower fan blows air through each vent hole to ventilate the vent hose 24, thereby exposing the air cushion beads 242, rolling contact with the lower paper pile, and blowing the paper pile upward to prevent the rigid chain 21 from rubbing or scratching the bottom surface of the upper paper pile and the top surface of the lower paper pile when changing paper. Among them, the present invention preferably uses an ion blower to eliminate static electricity generated by friction when changing paper by blowing ion wind outward.

[0040] When the rigid chain 21 holds up the paper pile, after the new paper pile on the paper feeding table is stacked with the held-up paper pile, the rigid chain 21 is reset, and at this time, air is ventilated through the ventilation hose 24, so that the air cushion beads 242 are moved down by air pressure to expose the outside of the ventilation hole 241 and fully contact the surface of the new paper pile. When the rigid chain 21 is pulled out, the air cushion beads 242 roll on the paper to avoid friction between the rigid chain 21 and the new paper pile, thereby protecting the cleanliness and integrity of the paper on the surface of the new paper pile.

[0041] Moreover, during ventilation, gas is simultaneously ejected from the vent hole 241 on the other side of the air cushion bead 242 to blow up the paper pile held up by the rigid chain 21, thereby preventing the paper at the bottom of the paper pile from being worn when the rigid chain 21 is pulled out, and also preventing static electricity problems that may be generated during the pulling out of the rigid chain 21.

[0042] Here, the ventilation holes 241 on both sides are staggered so that when the ventilation hose 24 is ventilated, air will not convect to ensure air pressure. The spring 243 plays a role in guiding the bending, which can avoid blockage caused by the ventilation hose 24 folding due to the bending of the rigid chain 21 when the rigid chain 21 is extended.

[0043] The present invention connects the external blower or blower fan to the control slider 22, which can save equipment space. In other embodiments, the external blower or blower fan can be connected to the pointed plug-in portion 23, so that one end of the hose is set as a closed end, and the other end of the hose is connected to the external blower or blower fan, and air is ventilated into the hose through the pointed plug-in portion 23. This method can ensure that the supporting part of the rigid chain has airflow, so that when the chain is bent, it will not affect the air volume in the supporting part of the hose, ensuring or reducing the chain from scratching the paper piles above and below.

[0044] Please continue reading Figure 1 , Figure 2 , Figure 3 and Figure 5 The insertion chain assembly 2 also includes an upper transverse axis 25, a middle transverse axis 26 and a lower transverse axis 27. The upper transverse axis 25, the middle transverse axis 26 and the lower transverse axis 27 are all provided with gears 28. The rigid chain 21 is meshed with the gears 28. The middle transverse axis 26 extends out of the frame 1 and is arranged at a preset angle with the upper transverse axis 25 and the lower transverse axis 27. The preset angle is an obtuse angle to avoid excessive bending of the rigid chain 21 during transmission, resulting in poor ventilation.

[0045] In this embodiment, the reset mechanism is connected to the control slider 22 to drive the control slider 22 to reset. The rotating member is coaxially connected to the lower horizontal shaft 27 to drive the lower horizontal shaft 27 to rotate clockwise. The gear 28 arranged on the lower horizontal shaft 27 rotates synchronously, so that the rigid chain 21 meshing with the gear 28 is driven to extend downward. The upper horizontal shaft 25 and the middle horizontal shaft 26 play the role of assisting the rigid chain 21 in turning. Since the middle horizontal shaft 26 extends out of the frame 1, when the rigid chain 21 is inserted into the bottom of the paper pile, it does not extend at a right angle or an acute angle, which can further prevent the ventilation hose 24 from being folded excessively and blocked. After the paper changing operation is completed, the reset mechanism drives the control slider 22 to reset, so that the rigid chain 21 is reset synchronously, and the other end of the rigid chain 21 is reset to one side of the frame. At the same time, the pointed plug-in portion 23 can also abut against the gear of the lower horizontal shaft 27 to prevent the rigid chain 21 from being pulled up excessively and disengaged from the gear of the lower horizontal shaft 27 when resetting, which plays a double limit role.

[0046] In this embodiment, the preset angle is 100-140 degrees, and the preset angle is an obtuse angle, which can further prevent the rigid chain 21 from being bent and causing the ventilation hose 24 to be bent and blocked, thereby ensuring smooth ventilation.

[0047] Please also read Figure 4The insert chain assembly 2 also includes a gear housing 29, which is covered on the gear 28, and the lower part of the gear housing 29 extends the lower horizontal axis 27 to support the rigid chain 21. The upper and lower parts of the gear housing 29 are provided with through holes (not shown in the figure) for the rigid chain 21 to extend out. When the rigid chain 21 extends out of the through hole through the gear housing 29 extending the lower horizontal axis 27, the gear housing 29 plays a role in supporting the rigid chain 21, so that the rigid chain 21 extends straight, and provides a horizontal extension support force to the rigid chain 21, so that the rigid chain 21 will not fall off, and the load of the rigid chain 21 can be reduced, so that it is not easy to deform, and its service life is extended. In addition, the gear housing 29 plays a role in dust prevention, and at the same time, it can prevent foreign matter from entering between the gear 28 and the rigid chain 21, and avoid the staff from being injured due to misoperation, which has a protective effect. Specifically, the gear housing 29 is arranged on the lifting assembly 3, so that it can be lifted and lowered synchronously with the insert chain assembly 2.

[0048] Furthermore, a support rod 11 for inserting the pointed plug-in portion 23 may be provided on the frame 1, and a socket 111 for inserting the pointed plug-in portion 23 may be provided on the support rod 11 to provide support for the rigid chain 21 to prevent the rigid chain 21 from being deformed due to the gravity of the upper paper pile when the rigid chain 21 lifts the upper paper pile. Specifically, the support rod is connected to the lifting assembly 3 so that it is lifted and lowered synchronously with the rigid chain 21 to ensure the balance of the paper pile, that is, to keep it in a horizontal paper feeding state.

[0049] Furthermore, an electromagnet 231 is provided on the pointed plug-in portion 23 and the gear housing 29. When the rigid chain 21 is reset, the electromagnet 231 is energized and attracted to prevent the rigid chain 21 from being separated from the gear after being reset. When the rigid chain 21 is extended to drag the paper pile (the lower horizontal axis serves as the main drive), the electromagnet is de-energized and the magnetic force disappears, so that the rigid chain 21 can be extended.

[0050] like Figures 1 to 4 As shown, in an optional embodiment, the linear slide rails located on the sides of the three horizontal axes are longer, so that the three horizontal axes can rise and fall synchronously with the long linear slide rails, and the linear slide rails located at the other end of the rigid chain are shorter to avoid interference between the linear slide rails and the paper pile to be replaced. Here, it is only necessary to ensure that the control slider 22 slides left and right on the horizontal plane.

[0051] Preferably, the diameter of the through hole in the upper portion of the gear housing 29 is smaller than the height of the control slider 22 , so that when the control slider 22 slides to the right, the gear housing 29 can also play a limiting role.

[0052] Please also read Figure 3 , Figure 6 and Figure 7In one embodiment, the rigid chain 21 is reset in the direction of the chain front end, and the rigid chain 21 includes an inner chain plate (not shown), an outer chain plate 212, a pin 213, a first chain plate 214 and a second chain plate 215. One end of the first chain plate 214 (such as Figure 6 , Figure 7 The left side end) is connected to the previous outer link 212' and one end of the previous inner link (such as Figure 6 , Figure 7 The right side end of the first chain plate 214 is rotatably connected, and the other end of the first chain plate 214 (such as Figure 6 , Figure 7 The right side end) is rotatably connected to the other end of the rear outer link plate 212", the other end of the rear inner link plate and the second chain plate 215 through a pin 213. The bottom of the second chain plate 215 extends to the middle of the rear first chain plate 214" and abuts against the bottom of the rear first chain plate 214". The bottom of the first chain plate 214 extends to the middle of the rear outer link plate 212 and abuts against the bottom of the rear second chain plate 215", so that one side of the rigid chain 21 has a bite engaged with the gear 28, and the matching structure of the first chain plate 214 and the second chain plate 215 makes the other side of the rigid chain 21 a plate surface. The bottoms of the first chain plate 214 and the second chain plate 215 abut each other, so that the rigid chain 21 can only bend and extend straight to the side engaged with the gear 28, so that the other end of the rigid chain 21 can be suspended to support the paper pile.

[0053] The first chain plate 214 includes a first mounting portion 2111, a second mounting portion 2112, an extension portion 2143 located at the lower side of the first mounting portion, and a support recess 2144 located at one side of the extension portion 2143. The extension portion 2143 is located at the lower side of the first mounting portion 2122 and extends out of the first mounting portion 2111. The support recess 2144 is located at the front side of the extension portion 2143.

[0054] The second chain plate 215 includes a third mounting portion 2151, an abutment portion 2152 located at the lower side of the third mounting portion, and an abutment recess 2153, wherein the abutment portion 2152 extends from the lower side of the third mounting portion 2151 and extends outside the third mounting portion 2151, and the abutment recess 2153 is located at the front side of the abutment portion 2152.

[0055] The abutment portion 2152 is matched with the supporting recess 2144 of the first chain plate 214, and the abutment recess 2153 is matched with the extending portion 2143 of the first chain plate 214, so that when the rigid chain 21 is extended, the extending portion 2143 of the first chain plate 214 abuts against the abutment recess 2153 of the second chain plate 215, and the abutment portion 2152 of the second chain plate 215 abuts against the supporting recess 2144 of the first chain plate 214. Due to the mutual abutment between the first chain plate 214 and the second chain plate 215, the rigid chain 21 will not turn outward, and play a supporting role to hold up the paper pile.

[0056] The upper and lower parts of the extension part 2143 and / or the abutment part 2152 are provided with through holes 2145 which are adapted to the position and size of the vent hole 241 of the hose, so as to allow the air cushion beads 242 to extend out of the rigid chain 21 and allow gas to be sprayed out, thereby preventing the rigid chain 21 from rubbing against the paper pile.

[0057] In another embodiment, if Figure 8 As shown, the rigid chain 21 includes an inner chain plate, an outer chain plate pin and a supporting chain plate 216, one end of the supporting chain plate 216 is connected to the previous inner chain plate and the outer chain plate through a pin, and the other end of the supporting chain plate 216 is connected to the next inner chain plate and the outer chain plate through a pin. The supporting chain plate extends to the middle of the previous outer chain plate and abuts against the previous chain plate, so that when the rigid chain 21 is extended, the mutual abutment between the chain plates prevents the rigid chain 21 from turning outward, thereby playing a supporting role to hold up the paper pile.

[0058] The upper and lower parts of the supporting chain plate 216 are both provided with through holes 2145 that match the position and size of the vent holes 241 to allow the air cushion beads 242 to extend out of the rigid chain 21 and for gas to be ejected, thereby preventing the rigid chain 21 from rubbing against the paper pile.

[0059] The above two rigid chains 21 can both support the paper pile, and the rigid chain 21 can be selected according to the needs. The bottom surface of the extension part 2143, the abutment part 2152 or the support chain plate 216 is a smooth surface, and the through hole wall of the gear housing 29 is a smooth surface, which reduces the friction between the bottom surface of the extension part 2143, the abutment part 2152 or the support chain plate 216 and the through hole wall.

[0060] Preferably, the inner wall of the through hole is provided with a ball 291, which rolls in contact with the bottom of the rigid chain 21, and while supporting the rigid chain 21, avoids hard contact between the rigid chain 21 and the gear housing 29 when the rigid chain 21 is extended and reset. While keeping the lower part of the rigid chain 21 extended in a horizontal direction, the rigid chain 21 will not be worn by friction with the gear housing 29.

[0061] Furthermore, the hose is retractably and movably arranged in the chain plate (such as the first chain plate 214, the second chain plate 215 or the supporting chain plate 216), that is, there is a certain moving space in the chain plate. When the rigid chain 21 is extended or reset, the chain plate of its bent part (such as the part of the rigid chain located in the gear housing) will have a certain distance from the inner and outer chain plates, so that the hose is exposed. However, since the lengths of the rigid chain 21 and the hose remain unchanged and the supporting effect of the spring does not affect the ventilation and the normal operation of the chain.

[0062] Of course, in other embodiments, the hose can also be placed between the inner and outer chain sheets and the chain plates, and the air cushion beads are embedded in the chain plates. The air cushion beads will not fall out when the chain is running. It is only necessary that the position of the vent holes on the hose correspond to the position of the air cushion beads on the chain plates to ensure that the air cushion beads can contact the paper pile below during ventilation.

[0063] Please also read Fig. 9 The inner chain piece and the outer chain piece 212 both extend inwardly and have a support portion 2111, and there is a gap between the two support portions 2111 for the gear 28 to pass through. The support portion 2111 is used to increase the contact surface between the inner chain piece and the outer chain piece 212 and the paper pile, increase the bearing capacity of the inner chain piece and the outer chain piece 212, and avoid indentations or scratches on the paper at the bottom of the paper pile.

[0064] In summary, the automatic paper changing plug-in rod device of the single-sheet printing press provided by the present invention, when performing a paper changing operation, is extended by the plug-in chain assembly and inserted into the bottom of the paper pile on the paper feeding table. At this time, the paper feeding table descends, and the paper pile is lifted by the plug-in chain assembly. When a new paper pile is provided by the device and stacked with the paper pile on the plug-in chain assembly, the plug-in chain assembly is pulled out and reset, and the paper changing operation is completed. The reset plug-in chain assembly is located above the paper feeding table, and only a small part of it stands upright on the side of the paper feeding table, so that it does not affect the normal operation of the equipment and occupies a small space. While the paper changing operation is in progress, the lifting and lowering of the plug-in chain assembly is also controlled by the lifting assembly, such as: consistent with the lifting frequency of the paper feeding table, so as to meet the normal paper supply of the printing press during the paper changing process, thereby ensuring the normal operation of the equipment.

[0065] Furthermore, the insert chain assembly also includes a ventilation hose arranged in the rigid chain, the ventilation hose is staggered with a plurality of ventilation holes on both sides of the rigid chain, and air cushion beads are arranged in the ventilation holes at the bottom, and a spring is arranged in the ventilation hose to prevent it from being blocked when it is bent. When the rigid chain holds up the paper pile, after the new paper pile on the paper feeding table is stacked with the held-up paper pile, the rigid chain is reset, and ventilation is performed through the ventilation hose at this time, so that the air cushion beads are moved downward by air pressure, and partially extend out of the ventilation holes to fully contact the surface of the new paper pile. When the rigid chain is pulled out, the friction between the rigid chain and the new paper pile can be avoided by the air cushion beads rolling on the paper, thereby protecting the cleanliness and integrity of the paper on the surface of the new paper pile. Moreover, during ventilation, gas is ejected from the ventilation holes on the other side of the air cushion beads at the same time to blow up the paper pile held up by the rigid chain, so as to avoid the paper at the bottom of the paper pile being worn when the rigid chain is pulled out, and the static electricity problem that may be generated during the process of pulling out the rigid chain can also be avoided.

[0066] The spring also plays a role in guiding the bending, so as to avoid the ventilation hose being blocked due to bending when the rigid chain is extended.

[0067] In addition, the present invention has a simple structure and can realize automatic paper changing operation to improve the intelligence level of the equipment.

[0068] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. An automatic paper changing rod insertion device for a sheet-fed printing press, characterized in that: The machine comprises a frame, on which a chain assembly is provided for extending and lifting a paper pile on a paper feeding table of a sheet-fed printing press and resetting the paper pile to stack with the paper pile to be replaced, and a lifting assembly for controlling the lifting of the chain assembly to continuously supply paper to the sheet-fed printing press. The lifting assembly adopts a linear slide rail structure, the chain assembly is slidably connected to the lifting assembly, and the reset end of the chain assembly is located above the paper feeding table; The insert chain assembly also includes a plurality of rigid chains and a ventilation hose arranged in the rigid chain, wherein the ventilation hose is provided with a plurality of ventilation holes staggered on both sides of the rigid chain, and an air cushion bead is provided in the ventilation hole at the bottom, and a spring is provided in the ventilation hose to prevent it from being blocked when being bent, one end of the ventilation hose is connected to the control slider and communicated with the ventilation hole of the control slider, and the other end of the ventilation hose is a closed end and connected to the other end of the rigid chain; The rigid chain includes a plurality of chain units, and the chain unit includes a first chain plate and a second chain plate, the first chain plate includes a first mounting portion and an extension portion located at the lower side of the first mounting portion, and the extension portion extends out of the first mounting portion; the second chain plate includes a third mounting portion, an abutment portion located at the lower side of the third mounting portion, and an abutment recess, the abutment portion extends out of the third mounting portion, and the extension portion and / or the abutment portion have through holes for exposing the air cushion beads; When performing a paper changing operation, the plug-in chain assembly slides to the right to extend its lower part and insert it into the bottom of the paper pile on the paper feeding table. The sheet-fed printing press then lowers the paper feeding table and holds up the paper pile. When a new paper pile is provided by the sheet-fed printing press equipment and stacked with the paper pile on the plug-in chain assembly, the plug-in chain assembly is pulled out and reset to complete the paper changing operation. The reset plug-in chain assembly is located above the paper feeding table and partially stands upright on the side of the paper feeding table. After the plug-in chain assembly is reset, the lifting assembly simultaneously descends and resets to place the plug-in chain assembly at the initial position of the operation, so as to facilitate the next paper changing operation, and repeat this process.

2. The automatic paper changing rod insertion device of a sheet-fed printing press according to claim 1, characterized in that: The insert chain assembly also includes a control slider, a reset mechanism and a rotating member. One end of the rigid chain is connected to the control slider. The reset mechanism is connected to the control slider to drive the control slider to reset. The rotating member is connected to the rigid chain to drive the rigid chain to extend and hold up the paper pile.

3. The automatic paper changing rod insertion device of a sheet-fed printing press according to claim 2, characterized in that: The other end of the rigid chain is provided with a pointed plug-in portion for inserting into a groove on a paper pile rack of a paper feeding station. When the insert chain assembly is reset, the pointed plug-in portion serves as a limiting portion for resetting the rigid chain.

4. The automatic paper changing rod insertion device of a sheet-fed printing press according to claim 2, characterized in that: The insertion chain assembly also includes an upper transverse axis, a middle transverse axis and a lower transverse axis, and gears are arranged on the upper transverse axis, the middle transverse axis and the lower transverse axis. The rigid chain is meshed with the gears. The middle transverse axis extends out of the frame and is arranged at a preset angle with the upper transverse axis and the lower transverse axis. The reset mechanism is connected to the control slider to drive the control slider to reset. The rotating member is connected to the lower transverse axis to drive the lower transverse axis to rotate.

5. The automatic paper changing rod insertion device of a sheet-fed printing press according to claim 4, characterized in that: The insert chain assembly also includes a gear housing, which is covered on the gear and has a lower horizontal axis extending from its lower part to support the rigid chain. The upper and lower parts of the gear housing are provided with through holes for the rigid chain to extend out.

6. The automatic paper changing rod insertion device of a sheet-fed printing press according to claim 4, characterized in that: The chain unit also includes an inner chain plate, an outer chain plate and a pin. One end of the first chain plate is rotatably connected to the previous outer chain plate and one end of the previous inner chain plate through a pin. The other end of the first chain plate is rotatably connected to the other end of the rear outer chain plate, the other end of the rear inner chain plate and the second chain plate through a pin. The bottom of the second chain plate extends to the middle of the rear first chain plate and abuts against the rear first chain plate. The bottom of the first chain plate extends to the middle of the rear outer chain plate and abuts against the rear second chain plate.

7. The automatic paper changing rod insertion device of a sheet-fed printing press according to claim 6, characterized in that: The first chain plate further includes a second mounting portion and a supporting recess located at one side of the extending portion, and the extending portion extends outwardly of the first mounting portion.

8. The automatic paper changing rod insertion device of a sheet-fed printing press according to any one of claims 6 to 7, characterized in that: The inner chain plate and the outer chain plate both have a support portion extending inwardly, and a gap is provided between the two support portions for the gear to pass through.

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