CN107097515B - Sheet-fed offset printing machine front gauge and sheet-fed offset printing machine - Google Patents

Abstract

The invention provides a front gauge of a sheet-fed offset press, which comprises a paper blocking block, a connecting rod, a short swing rod of the front gauge, a swing rod shaft, a pin shaft, a driving swing rod and a driving shaft, wherein the paper blocking block is arranged on the front gauge; the paper blocking block is fixedly arranged at the end part of the connecting rod, the other end of the connecting rod is movably connected with the driving swing rod through a pin shaft, the driving swing rod is fixedly arranged on the driving shaft, the front gauge short swing rod and the connecting rod are movably arranged on a swing rod shaft, and the front gauge short swing rod, the connecting rod and the driving swing rod are sequentially connected to form a four-bar mechanism. The four-bar mechanism is adopted for connection, so that the vibration problem caused by fixing the spring is avoided, the accuracy, reliability and stability of the front gauge positioning are improved, and the adjustment is more convenient.

Description

Sheet-fed offset printing machine front gauge and sheet-fed offset printing machine

technical field

The invention relates to the field of printing equipment, in particular to a front gauge of a sheet-fed offset printing machine and a sheet-fed offset printing machine.

Background technique

The front gauge is an indispensable mechanical part in the printing machine. Its function is to accurately position the upper and lower positions of the paper on the edge of the jaw during the printing process, so that each paper can be stopped at the same position and at the same angle. The front gauge then leaves and the paper is fed into the printing unit.

The front gauge is divided into up-swing type and bottom-swing type according to the structure and operation direction of the front gauge. Due to its structure, the top-swing front gauge takes a relatively long time to position the paper during operation, which makes the top-swing front gauge unable to meet the requirements of the front positioning speed in high-speed printing.

As shown in Figure 1 and Figure 2, the existing hem type front gauge, such as the Heidelberg

The front gauge used in the Speedaster CD-102 series printing machine has low positioning accuracy, large vibration and shock, The height and inclination angle of the front gauge are not easy to adjust, which will have a negative impact on the printing quality and equipment life.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a sheet-fed offset printing machine front gauge and a sheet-fed offset printing machine.

In order to achieve the above object, the present invention provides a front gauge of a sheet-fed offset printing machine, which includes a paper stopper, a connecting rod, a short swing rod of the front gauge, a swing rod shaft, a pin shaft, a driving swing rod and a drive shaft; the paper stopper is fixed Installed at the end of the connecting rod, the other end of the connecting rod is movably connected with the driving swing rod through the pin shaft, the driving swing rod is fixedly installed on the driving shaft, the front gauge short swing rod and the connecting rod are movably installed on the swing rod shaft, the front gauge The short swing link, the connecting rod and the driving swing link are sequentially connected to form a four-bar linkage.

The four-bar linkage mechanism does not need to use springs and other structures to keep the parts fixed and in contact like the traditional front gauge mechanism. The structure has fewer components, more flexible operation, and more convenient lubrication and maintenance, so the wear is slower and the service life is longer. At the same time, because the structure is simplified and the space becomes larger, it can skillfully avoid the interference between the front gauge structure and the gripper mechanism in the structural space. The contact between the link mechanisms is maintained by their own closed geometry, because they are all rigid structures, which avoids the problem of elastic vibration that may occur in the spring structure, ensures the accuracy of the previous positioning and release, and effectively reduces The vibration and impact caused by the rapid periodic movement of the front gauge mechanism in high-speed printing are reduced, and it can better adapt to the paper positioning requirements during high-speed printing. The power of the drive shaft comes from the cam structure fixedly connected to the end of the drive shaft. The cam and the cam swing rod drive the drive shaft to swing back and forth, which is transmitted to the connecting rod and the paper stop block, so as to realize the periodic paper stop and release of the front gauge. It is a prior art solution, so it is omitted and will not be described in detail.

In one embodiment of the present invention, it also includes a stop driving member, a support shaft, a stop arm and a stop swing bar; the stop swing bar is fixedly connected to the drive shaft and swings with the drive shaft; the stop arm is movably installed on the On the support shaft, the stop driving part is connected with the stop arm, and the stop drive part can drive the stop arm to rotate around the support shaft; the rotation track of the stop arm overlaps with the swing track of the stop swing bar.

The front gauge is driven by a four-bar linkage mechanism, and the structure is relatively simple. Because printing machines are usually very large, it takes time to completely start and stop the equipment. Therefore, during the printing process, the printing machine can be stopped quickly and effectively by interrupting the conveying of the paper. work. Stop from the driving end of the front lay structure, stop the departure of the front lay, the paper will be blocked by the front lay, and cannot be conveyed to the printing equipment, the structure is simple and easy to operate, and has good stability in use.

In one embodiment of the present invention, the stop driving member is an air cylinder.

When the front gauge is running at high speed, the brake arm suddenly turns into the motion of blocking the automatic swing rod, which is easy to generate a large impact force and impacts the stopper parts. When the cylinder is subjected to a large stress, the air volume in the cylinder can be compressed, which plays a certain buffering role and reduces the damage to the equipment during the stop process.

In one embodiment of the present invention, it also includes a height adjustment assembly, an eccentric sleeve is provided on the swing rod shaft, the eccentric sleeve is fixedly connected to the swing rod shaft, and the short front gauge swing rod and connecting rod are movably installed on the eccentric sleeve, The end of the swing rod shaft is in transmission connection with the height adjustment assembly.

Because there is no spring structure in this front gauge, the rod and the shaft are rigidly connected, and it is a separate structure compared to the wallboard of the offset printing machine. By adjusting the swing rod shaft which plays a supporting role, the entire front gauge structure can be adjusted. s position. Utilizing the characteristics of the fluctuation of the distance between the peripheral surface of the eccentric sleeve and the center of the sleeve to realize the adjustment of the front gauge structure can be more direct and accurate, which helps to improve the positioning accuracy of the equipment.

In one embodiment of the present invention, the height adjustment assembly includes a front height adjustment screw and a swing shaft gear, the swing shaft gear is fixedly mounted on the swing shaft, and the thread on the swing shaft gear and the front height adjustment screw Engagement transmission.

The positioning accuracy of the front gauge of the printing machine is quite high, and the adjustment range will not be too large. The screw and gear meshing structure are adopted. On the one hand, according to the principle of torque balance, although the equipment parts are quite heavy, it only needs to be used. Small force can be adjusted; on the other hand, even if the height adjustment screw of the front gauge rotates a large range, the driven swing rod shaft gear will only rotate a small range, and the adjustment range of the swing rod shaft is very slow, which can effectively Improve the accuracy when adjusting.

In one embodiment of the present invention, an inclination adjustment assembly is also included, the inclination adjustment assembly includes an eccentric bearing seat, and one end of the drive shaft is movably installed in the eccentric bearing seat.

In one embodiment of the present invention, the tilt adjustment assembly further includes a front gauge tilt adjustment screw and a transmission gear, the transmission gear is arranged between the eccentric bearing seat and the front gauge tilt adjustment screw, and the thread on the front gauge tilt adjustment screw It meshes with the transmission gear, and drives the eccentric bearing seat to rotate through the transmission gear.

An eccentric sleeve is arranged on the swing rod shaft, and when the swing rod shaft rotates, the undulation of the support surface is uniform, so that the height of the front gauge can be adjusted; while only one end of the drive shaft is set in the eccentric bearing seat, so when the eccentric bearing seat rotates , one end of the drive shaft is displaced, while the other end is fixed, so that the drive shaft is tilted relative to the original position. Because of the separate structure of the front gauge, the swing lever shaft that plays a supporting role is adjusted. , the position of the entire front gauge structure can be adjusted.

In one embodiment of the present invention, rollers are provided on the paper blocking block.

In the traditional front gauge, the end of the paper stop block is usually designed as an upturned paper guide plate, which guides the paper to be smoothly sent to the paper stop block of the front gauge, which is convenient for compaction and positioning. Change the paper guide plate at the end of the paper stop block to a roller, which can also play a guiding role when the paper is conveyed, but the sliding friction on the paper is changed to rolling friction, so that the resistance of the paper during conveying is reduced. It ensures that the paper has enough kinetic energy to reach the edge of the front gauge, which helps to increase the accuracy of positioning.

The present invention also provides a front rule of a sheet-fed offset printing machine, including the above-mentioned front rule of a sheet-fed offset printing machine.

Description of drawings

Figure 1 is a schematic structural view of the front gauge of the Heidelberg Speedaster CD-102 series printing press.

Figure 2 is a schematic diagram of the working principle of the front gauge of the Heidelberg Speedaster CD-102 series printing machine.

Fig. 3 is a schematic top view of the front lay of the sheet-fed offset printing machine of the present invention.

FIG. 4 is an enlarged schematic view of part A in FIG. 3 .

Fig. 5 is a left view structure schematic diagram of the front gauge of the sheet-fed offset printing machine of the present invention and its height adjustment structure and tilt adjustment structure.

FIG. 6 is an enlarged schematic diagram of part D in FIG. 5 .

FIG. 7 is an enlarged schematic view of part B in FIG. 3 .

FIG. 8 is an enlarged schematic view of part C in FIG. 3 .

Fig. 9 is a schematic left view of the stop structure of the front gauge of the sheet-fed offset printing press according to the present invention.

Each reference mark in the figure is:

1. Paper blocking block; 12. Roller; 2. Connecting rod; 21. Swing lever shaft; 22. Pin shaft; 3. Front gauge short swing lever; 41. Drive swing lever; 42. Drive shaft; 51. Stop drive 52, support shaft; 53, stop arm; 54, stop swing lever; 61, eccentric sleeve; 62, front regulation height adjustment screw; 63, swing lever shaft gear; 71, eccentric bearing seat; 72, front regulation Tilt adjustment screw rod; 73, transmission gear.

Detailed ways

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with accompanying drawings.

Please refer to Fig. 3, Fig. 4 and Fig. 5. The present invention provides a sheet-fed offset press front gauge, which includes a paper stop block 1, a connecting rod 2, a front gauge short swing rod 3, a swing rod shaft 21, a pin shaft 22, Drive pendulum 41 and drive shaft 42; paper blocking block 1 is fixedly installed on the end of connecting rod 2, the other end of connecting rod 2 is movably connected with driving pendulum 41 through pin shaft 22, and driving pendulum 41 is fixedly installed on drive shaft 42 Above, the front gauge short swing link 3 and the connecting rod 2 are movably installed on the swing link shaft 21, and the front gauge short swing link 3, the connecting rod 2 and the driving swing link 41 are connected in sequence to form a four-bar linkage mechanism.

The front gauge short fork 3, the connecting rod 2 and the drive fork 41 are connected in sequence to form a four-bar linkage, which does not need to use springs and other structures to keep the parts fixed and in contact like the traditional front gauge mechanism. The structure has fewer components, more flexible operation, and more convenient lubrication and maintenance, so the wear is slower and the service life is longer. At the same time, because the structure is simplified and the space becomes larger, it can skillfully avoid the interference between the front gauge structure and the gripper mechanism in the structural space. The contact between the link mechanisms is maintained by their own closed geometry, because they are all rigid structures, which avoids the problem of elastic vibration that may occur in the spring structure, ensures the accuracy of the previous positioning and release, and effectively reduces The vibration and impact caused by the rapid periodic movement of the front gauge mechanism in high-speed printing are reduced, and it can better adapt to the paper positioning requirements during high-speed printing. The power of the drive shaft 42 comes from the cam structure fixedly connected to the end of the drive shaft. The cam and the cam swing rod drive the drive shaft to swing back and forth, which is transmitted to the connecting rod and the paper stop block, so as to realize the periodic paper stop and release of the front gauge. This is a prior art solution, so it will not be described in detail.

Please refer to Fig. 3, Fig. 8 and Fig. 9, as a kind of embodiment, also comprise stop driver 51, support shaft 52, stop arm 53 and stop fork 54; Stop fork 54 and drive shaft 42 are fixed connected, following the drive shaft 42 to swing; the stop arm 53 is movably installed on the support shaft 52, the stop drive member 51 is connected to the stop arm 53, and the stop drive member 51 can drive the stop arm 53 to rotate around the support shaft 52; The rotation track of the stop arm 53 overlaps with the swing track of the stop swing bar 54 .

The front gauge is driven by a four-bar linkage mechanism, and the structure is simple and reliable. Because the printing machines are usually very large, it takes time to start and stop the equipment completely. Therefore, during the printing process, the printing machine can be stopped quickly and effectively by interrupting the conveying of the paper. work. Stop from the driving end of the front lay structure, stop the departure of the front lay, the paper will be blocked by the front lay, and cannot be conveyed to the printing equipment, the structure is simple and easy to operate, and has good stability in use.

As an embodiment, the stop driving member 51 is an air cylinder.

As shown in Figure 9, when the front gauge is running at high speed, the brake arm 53 suddenly turns to the movement of blocking the stop swing bar 54, which is easy to generate a large impact force, which will cause an impact on the stop component. When the cylinder is subjected to a large stress, the air volume in the cylinder can be compressed, which plays a certain buffering role and reduces the damage to the equipment during the stop process.

Please refer to Fig. 3 and Fig. 4, as an embodiment, it also includes a height adjustment assembly, an eccentric sleeve 61 is also provided on the swing rod shaft 21, and the eccentric sleeve 61 is fixedly connected with the swing rod shaft 21, and the front gauge short swing rod 3 and The connecting rod 2 is movably installed on the eccentric sleeve 61, and the end of the swing rod shaft 21 is connected with the transmission of the height adjustment assembly.

Because there is no spring structure in this front gauge, the rod and the shaft are rigidly connected, and it is a separate structure compared to the wallboard of the offset printing machine. By adjusting the swing rod shaft which plays a supporting role, the entire front gauge structure can be adjusted. s position. Utilizing the characteristics of the fluctuation of the distance between the peripheral surface of the eccentric sleeve and the center of the sleeve to realize the adjustment of the front gauge structure can be more direct and accurate, which helps to improve the positioning accuracy of the equipment.

Please refer to Fig. 3, Fig. 4 and Fig. 5, as an embodiment, the height adjustment assembly includes a front gauge height adjustment screw 62 and a swing shaft gear 63, the swing shaft gear 63 is fixedly installed on the swing shaft 21, and the swing Shaft gear 63 and the screw thread meshing transmission on the height adjusting screw rod 62 of front regulation.

The positioning accuracy of the front gauge of the printing machine is quite high, and the adjustment range will not be too large. The screw and gear meshing structure are adopted. On the one hand, according to the principle of torque balance, although the equipment parts are quite heavy, it only needs to be used. Small force can be adjusted; on the other hand, even if the front gauge height adjustment screw 62 rotates relatively large, the driven swing rod shaft gear 63 will only rotate a small range, and the adjustment range of the swing rod shaft 21 is very slow. , can effectively improve the adjustment accuracy.

Please refer to FIG. 3 and FIG. 7 , as an embodiment, an inclination adjustment assembly is also included. The inclination adjustment assembly includes an eccentric bearing seat 71 , and one end of the drive shaft 42 is movably installed in the eccentric bearing seat 71 .

As an embodiment, the inclination adjustment assembly also includes a front gauge tilt adjustment screw 72 and a transmission gear 73, the transmission gear 73 is arranged between the eccentric bearing seat 71 and the front gauge tilt adjustment screw 72, and the thread on the front gauge tilt adjustment screw 72 Mesh with transmission gear 73, drive eccentric bearing seat 71 to rotate by transmission gear 73.

An eccentric sleeve 61 is arranged on the swing shaft 21, and the undulation of the support surface is uniform when the swing shaft 21 rotates, so that the height of the front gauge can be adjusted; and only one end of the drive shaft 42 is arranged in the eccentric bearing seat 71, so When the eccentric bearing seat 71 rotates, one end of the drive shaft 42 is displaced, while the other end is fixed, so that the drive shaft 42 is inclined relative to the original position. The fork shaft 21 of supporting effect is regulated, and just can adjust the position of whole front gauge structure.

Please refer to FIG. 5 and FIG. 6 , as an embodiment, the paper stop block 1 is provided with rollers 12 .

In the traditional front gauge, the end of the paper stop block 1 is usually designed as an upturned paper guide plate, which guides the paper to be smoothly sent to the paper stop block of the front gauge, which is convenient for compaction and positioning. Changing the paper guide plate at the end of the paper blocking block 1 to the roller 12 can also play a guiding role when the paper is conveyed, but the sliding friction on the paper is changed into rolling friction, so that the resistance of the paper during the conveying process is reduced. The small size ensures that the paper has enough kinetic energy to reach the edge of the front gauge, which helps to increase the accuracy of positioning.

The present invention also provides a front rule of a sheet-fed offset printing machine, including the above-mentioned front rule of a sheet-fed offset printing machine.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can use the methods disclosed above and technical content to analyze the present invention without departing from the spirit and scope of the present invention. Possible changes and modifications are made in the technical solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention, which do not depart from the content of the technical solution of the present invention, all belong to the technical solution of the present invention. protected range.

Claims (7)

1. A front gauge of a sheet-fed offset printing machine, including a paper stop block, a connecting rod, a short front gauge swing rod, a swing rod shaft, a pin shaft, a driving swing rod and a drive shaft; the paper stop block is fixedly installed at the end of the connecting rod , the other end of the connecting rod is flexibly connected with the driving swing rod through the pin shaft, the driving swing rod is fixedly installed on the driving shaft, the front gauge short swing rod and the connecting rod are movably installed on the swing rod shaft, the front gauge short swing rod, the connecting rod It is sequentially connected with the drive swing rod to form a four-bar linkage mechanism, which also includes a stop drive member, a support shaft, a stop arm and a stop swing rod; the stop swing rod is fixedly connected with the drive shaft and swings with the drive shaft; The boom is movably installed on the support shaft, the stop driving part is connected with the stop arm, and the stop drive part can drive the stop arm to rotate around the support shaft; the rotation track of the stop arm overlaps with the swing track of the stop swing bar, The paper blocking block is provided with rollers. 2. The front layup of a sheet-fed offset printing machine according to claim 1, wherein the stop driving member is an air cylinder. 3. The front gauge of the sheet-fed offset printing machine according to claim 1, characterized in that it also includes a height adjustment assembly, an eccentric sleeve is arranged on the swing lever shaft, and the eccentric sleeve is fixedly connected with the swing lever shaft, and the front gauge The short swing rod and the connecting rod are movably installed on the eccentric sleeve, and the shaft end of the swing rod is connected with the transmission of the height adjustment assembly. 4. The front gauge of the sheet-fed offset printing machine according to claim 3, wherein the height adjustment assembly comprises a front gauge height adjustment screw and a swing shaft gear, the swing shaft gear is fixedly mounted on the swing shaft, The thread engagement transmission on the fork shaft gear and the front regulation height adjustment screw rod. 5. The front gauge of a sheet-fed offset printing machine according to claim 1, further comprising an inclination adjustment assembly, the inclination adjustment assembly includes an eccentric bearing seat, and one end of the drive shaft is movably installed in the eccentric bearing seat . 6. The front gauge of the sheet-fed offset printing machine according to claim 5, wherein the tilt adjustment assembly further includes a front gauge tilt adjustment screw and a transmission gear, and the transmission gear is arranged on the eccentric bearing seat and the front gauge tilt Between the adjusting screw rods, the screw thread on the front gauge tilt adjusting screw rod meshes with the transmission gear, and the eccentric bearing seat is driven to rotate by the transmission gear. 7. A sheet-fed offset printing machine, characterized in that it comprises the front gauge of a sheet-fed offset printing machine according to any one of claims 1-6.

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