An upper water control device for a printing press

Abstract

The application discloses a water feeding control device of a printing machine, which comprises a water tank rubber roller, a water feeding steel roller, a plate-approaching water roller, a water stringing roller, a first clutching mechanism, a second clutching mechanism, two first pressure adjusting mechanisms and two water tank rubber roller skew adjusting mechanisms. The first clutching mechanism comprises a first clutching pneumatic cylinder connected to the top rear part of the water feeding steel roller arm frame; the second clutching mechanism comprises a cam connecting rod hinged to the inner side of the water tank rubber roller arm frame and having a top surface in contact with the bottom surface of the rubber roller bearing and a second clutching pneumatic cylinder connected to the lower end of the cam connecting rod; the two first pressure adjusting mechanisms and the two water tank rubber roller skew adjusting mechanisms are respectively installed on the driving side and the operating side; each first pressure adjusting mechanism comprises a front limiting groove, a rear limiting groove, a worm and gear mechanism, a worm adjusting shaft and a pin shaft; and each water tank rubber roller skew adjusting mechanism comprises a pile head and a skew adjusting screw rod. The application can feed water more finely and quickly and can realize uniform water feeding for different plate formats.

Description

TECHNICAL FIELD

[0001] The present application relates to a printing machine, in particular to a water feeding control device of a printing machine. BACKGROUND

[0002] With the development of printing technology, the printing quality is also getting higher and higher. In order to meet the changing needs of the printing factory, the printing machine manufacturing enterprises need to design a control device which is more convenient to adjust, more precise to control water quantity, and can achieve different water feeding quantity requirements on both sides of the small water quantity and the different areas of the printed matter, so as to achieve good printing effect.

[0003] The existing water feeding device (see CN203046431 Water Feeding Device of a Offset Printing Machine) has the following defects:

[0004] 1. The water feeding quantity control is not uniform or cannot precisely control the water quantity;

[0005] 2. Cannot control the water thickness (i.e. water feeding quantity) in different areas of the printed matter. SUMMARY

[0006] The purpose of the present application is to overcome the defects of the prior art and provide a water feeding control device of a printing machine, which can not only feed water more precisely and quickly to achieve water ink balance, but also achieve uniform water feeding quantity on different pages.

[0007] The purpose of the present application is achieved by a water feeding control device of a printing machine, which comprises a water tank rubber roller, a water transmission steel roller, a page water roller and a water string roller, a first pressure release mechanism, a second pressure release mechanism, two first pressure adjusting mechanisms and two water tank rubber roller skew adjusting mechanisms; wherein,

[0008] The two ends of the water tank rubber roller are respectively installed in the top groove of the two water tank rubber roller arm frames through rubber roller bearings one by one in a corresponding manner;

[0009] The water transmission steel roller is arranged above the water tank rubber roller, and the two ends of the water transmission steel roller are respectively installed in the upper part of the two water transmission steel roller arm frames through steel roller bearings one by one in a corresponding manner; the two water transmission steel roller arm frames are located one by one on the outside of the two water tank rubber roller arm frames and on the inside of the driving side wall plate and the operating side wall plate of the printing machine, and the middle part of the two water transmission steel roller arm frames is respectively installed on the driving side wall plate and the operating side wall plate through arm frame bearing seats one by one in a corresponding manner;

[0010] The page water roller is arranged in front of the water transmission steel roller, and the two ends of the page water roller are respectively installed on the two water roller arm frames through shaft head bearings one by one in a corresponding manner, and the two water roller arm frames are hingedly connected to the inner side surface of the driving side wall plate and the inner side surface of the operating side wall plate;

[0011] The string water roller is tangentially arranged below the water roller, and two ends of the string water roller are respectively installed on the lower parts of the two water roller arm frames through shaft head bearings;

[0012] The first clutching mechanism comprises two first clutching cylinders which are connected to the top rear parts of the two water roller arm frames, and the cylinder bodies of the two first clutching cylinders are hingedly connected to the inner sides of the driving side wall plate and the operating side wall plate;

[0013] The second clutching mechanism comprises two cam connecting rods and two second clutching cylinders, the top surfaces of the two cam connecting rods are curved surfaces, the two cam connecting rods are hingedly connected to the installation grooves which are vertically communicated with the top grooves and are formed in the inner sides of the two water tank rubber roller arm frames, and the top surfaces of the two cam connecting rods are in contact with the bottom surfaces of the two rubber roller bearings, and the two second clutching cylinders are connected to the lower ends of the two cam connecting rods, and the cylinder bodies of the two second clutching cylinders are hingedly connected to the inner sides of the rear lower parts of the two water tank rubber roller arm frames;

[0014] The two first pressure adjusting mechanisms are installed on the driving side and the operating side of the printing machine, each first pressure adjusting mechanism comprises a front limiting groove, a rear limiting groove, a worm and gear mechanism, a worm adjusting shaft and a pin shaft, the front limiting groove is horizontally formed in the lower front end surface of the water tank rubber roller arm frame, the rear limiting groove is horizontally formed in the upper rear end surface of the water tank rubber roller arm frame, the worm of the worm and gear mechanism is arranged between the outer side of the water tank rubber roller arm frame and the inner side of the water roller arm frame, the worm is installed on an eccentric worm shaft, the inner end of the eccentric worm shaft is inserted into the rear limiting groove, the worm of the worm and gear mechanism is installed on the inner side of the water roller arm frame through a worm support and is engaged with the worm, the worm adjusting shaft is coaxially connected to the rear end of the worm, and the inner end of the pin shaft is inserted into the front limiting groove, and the outer end of the pin shaft is connected to the front lower end of the water roller arm frame;

[0015] The two water tank rubber roller skew adjusting mechanisms are installed on the driving side and the operating side of the printing machine, each water tank rubber roller skew adjusting mechanism comprises a stake and a skew adjusting screw, the stake is fixed to the inner side of the water roller arm frame, the head of the skew adjusting screw is screwed into a threaded hole which is formed in the lower rear end surface of the water tank rubber roller arm frame through the stake, and a stop washer is fixed to the front and rear of the stake.

[0016] The aforementioned water supply control device for a printing press further includes two second pressure regulating mechanisms installed one-to-one on the drive side and the operating side of the printing press; each second pressure regulating mechanism includes a nut seat and a water roller adjusting screw; the nut seat is fixed to the upper rear end face of the water conveying steel roller arm; the end of the water roller adjusting screw is screwed into the nut seat and a threaded through hole opened between the upper rear end face and the upper front end face of the water conveying steel roller arm, and then abuts against the rear end face of the water roller arm.

[0017] In the aforementioned water supply control device for the printing press, both the inner end of the eccentric worm gear shaft and the inner end of the pin shaft are provided with retaining rings.

[0018] The aforementioned water supply control device for a printing press further includes a drive mechanism comprising two drive shafts inserted one-to-one into the arm bearing seats on the drive side and the arm bearing seats on the operating side of the printing press, a drive gear mounted on the drive shaft on the drive side of the printing press, an external drive gear mounted on the outside of the drive side shaft head of the water transfer steel roller and meshing with the drive gear, an internal drive gear mounted inside the drive side shaft head of the water transfer steel roller, and a driven gear mounted on the drive side shaft head of the water tank rubber roller and meshing with the internal drive gear.

[0019] The water supply control device for the printing press of the present invention has the following characteristics:

[0020] 1) By setting up an independent first pressure adjustment mechanism on both the drive side and the operation side of the printing press, the present invention can adjust the linear contact pressure between the water tank roller and the water transfer steel roller in the vertical direction, thereby achieving more precise water volume adjustment and meeting the water volume requirements for printing more exquisite graphics.

[0021] 2) By setting up an independent second pressure adjustment mechanism on both the drive side and the operation side of the printing press, the present invention can adjust the pressure of the linear contact between the water transfer steel roller and the plate-mounting water roller, thereby achieving more precise water volume adjustment and meeting the water volume requirements for printing more exquisite graphics.

[0022] 3) This invention sets up an independent water trough roller tilt adjustment mechanism on both the drive side and the operation side of the printing press. This mechanism can adjust the axis of the water trough roller to be non-parallel to the axis of the water transfer steel roller and instead intersect it. This causes the pressure at the two ends of the water trough roller to change one-to-one with the two ends of the water transfer steel roller, thereby changing the amount of water transferred to meet the different requirements of the printed image.

[0023] 4) This invention can achieve more precise water volume adjustment, meeting the water volume requirements for printing more exquisite graphics and text. The technical structure adopted by this invention is mature, easy to use, and has low manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a rear view of the water control device of the printing machine of the present application;

[0025] Figure 1a is a view of A in Figure 1

[0026] Figure 1b is a view of B in Figure 1

[0027] Figure 2 is a perspective view of the rear side direction of the driving side of the water control device of the printing machine of the present application;

[0028] Figure 3 is a perspective view of the front side direction of the driving side of the water control device of the printing machine of the present application;

[0029] Figure 4 is a perspective view of the rear side direction of the operating side of the water control device of the printing machine of the present application;

[0030] Figure 5 is a perspective view of the front side direction of the operating side of the water control device of the printing machine of the present application.

[0031] Figure 6a is a principle structural view of the water trough rubber roller skew adjustment mechanism of the water control device of the printing machine of the present application when unadjusted;

[0032] Figure 6b is a principle structural view of the water trough rubber roller skew adjustment mechanism of the water control device of the printing machine of the present application when adjusted. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings.

[0034] Please refer to Figures 1 to 6b , the water control device of the printing machine of the present application, comprises a water trough rubber roller 1, a water transmission steel roller 2, a register water roller 3 and a water string roller 4, a first pressure release combination mechanism, a second pressure release combination mechanism, two first pressure adjustment mechanisms, two second pressure adjustment mechanisms, two water trough rubber roller skew adjustment mechanisms and a driving mechanism.

[0035] The two ends of the water trough rubber roller 1 are respectively and correspondingly installed in the top groove 11 in the middle of the top surface of the two water trough rubber roller arm frames 100 through the rubber roller bearing 10.

[0036] ​​The water transmission steel roller 2 is arranged above the water tank rubber roller 1, and the two ends of the water transmission steel roller 2 are respectively and correspondingly installed on the upper parts of the two water transmission steel roller arm frames 200 through steel roller bearings 20; the two water transmission steel roller arm frames 200 are respectively and correspondingly located outside the two water tank rubber roller arm frames 100 and inside the driving side wall plate and the operating side wall plate of the printing machine, and the middle parts of the two water transmission steel roller arm frames 200 are respectively and correspondingly installed on the driving side wall plate and the operating side wall plate through arm frame bearing seats 20A.

[0037] The plate water roller 3 is arranged in front of the water transmission steel roller 2, and the two ends of the plate water roller 3 are respectively and correspondingly installed on the two water roller arm frames 300 through shaft head bearings, and the two water roller arm frames 300 are respectively and correspondingly hinged on the inner side surfaces of the driving side wall plate and the operating side wall plate.

[0038] The string water roller 4 is tangentially arranged below the plate water roller 3, and the two ends of the string water roller 4 are respectively and correspondingly installed on the lower parts of the two water roller arm frames 300 through shaft head bearings.

[0039] The first disengaging and engaging mechanism is used for controlling the tangency or disengagement of the water transmission steel roller 2 and the plate water roller 3; the first disengaging and engaging mechanism comprises two first disengaging and engaging pneumatic cylinders 21 which are respectively and correspondingly connected to the top rear parts of the two water transmission steel roller arm frames 200, the cylinder bodies of the two first disengaging and engaging pneumatic cylinders 21 are respectively and correspondingly hinged on the inner side surfaces of the driving side wall plate and the operating side wall plate, and the two water transmission steel roller arm frames 200 are respectively and correspondingly driven to swing forward and backward with the corresponding arm frame bearing seats 20A as the rotation centers through the synchronous extension and contraction of the two first disengaging and engaging pneumatic cylinders 21, so as to make the water transmission steel roller 2 and the plate water roller 3 tangential or disengaged.

[0040] The second disengaging and engaging mechanism is used for controlling the tangency or disengagement of the water tank rubber roller 1 and the water transmission steel roller 2; the second disengaging and engaging mechanism comprises two cam connecting rods 12 and two second disengaging and engaging pneumatic cylinders 13; the top surfaces of the cam connecting rods 12 are curved surfaces, the middle parts of the two cam connecting rods 12 are respectively and correspondingly hinged on the installation grooves which are vertically communicated with the top grooves 11 and are arranged on the inner side surfaces of the two water tank rubber roller arm frames 100 through hinge pins, and the top surfaces of the two cam connecting rods 12 are respectively and correspondingly in contact with the bottom surfaces of the two rubber roller bearings 10; the two second disengaging and engaging pneumatic cylinders 13 are respectively and correspondingly connected to the lower ends of the two cam connecting rods 12, and the cylinder bodies of the two second disengaging and engaging pneumatic cylinders 13 are respectively and correspondingly hinged on the inner side surfaces of the rear lower parts of the two water tank rubber roller arm frames 100; the two cam connecting rods 12 are rotated through the synchronous extension and contraction of the two second disengaging and engaging pneumatic cylinders 13, and the top surfaces of the two cam connecting rods 12 respectively and correspondingly drive the two rubber roller bearings 10 to move upward or downward, so as to make the water tank rubber roller 1 and the water transmission steel roller 2 tangential or disengaged.

[0041] Two first pressure adjusting mechanisms are used to adjust the contact pressure between the water tank rubber roller 1 and the water conveying steel roller 2 in the up-down direction; the two first pressure adjusting mechanisms are installed one by one on the driving side and the operating side of the printing machine; each first pressure adjusting mechanism comprises a front limiting slot 31, a rear limiting slot 32, a worm and gear mechanism, a worm adjusting shaft 35 and a pin shaft 36; wherein the front limiting slot 31 is horizontally opened on the lower front end face of the water tank rubber roller arm support 100; the rear limiting slot 32 is horizontally opened on the upper rear end face of the water tank rubber roller arm support 100; the worm wheel 33 in the worm and gear mechanism is arranged between the outer side face of the water tank rubber roller arm support 100 and the inner side face of the water conveying steel roller arm support 200, the worm wheel 33 is installed on an eccentric worm wheel shaft 330, the inner end head of the eccentric worm wheel shaft 330 is inserted into the rear limiting slot 32, the inner end head of the eccentric worm wheel shaft 330 is provided with a retaining ring to prevent the eccentric worm wheel shaft 330 from being axially pulled out of the rear limiting slot 32; the worm 34 in the worm and gear mechanism is installed on the inner side face of the water conveying steel roller arm support 200 through a worm support 340 and is engaged with the worm wheel 33; the worm adjusting shaft 35 is coaxially connected to the rear end of the worm 34; the inner end head of the pin shaft 36 is inserted into the front limiting slot 31, the inner end head of the pin shaft 36 is also provided with a retaining ring to prevent the pin shaft 36 from being axially pulled out of the front limiting slot 31, the outer end head of the pin shaft 36 is connected to the front lower end of the water conveying steel roller arm support 200; rotating the worm adjusting shaft 35 drives the worm wheel 33 and the worm wheel eccentric shaft 330 to rotate, the rotation of the worm wheel eccentric shaft 330 makes the water tank rubber roller arm support 100 swing around the pin shaft 36 as the center of rotation, and then the water tank rubber roller arm support 100 moves upward or downward with the water tank rubber roller 1, thereby adjusting the contact pressure between the water tank rubber roller 1 and the water conveying steel roller 2 in the up-down direction. The two first pressure adjusting mechanisms are independently adjusted;

[0042] Two second pressure adjusting mechanisms are used to adjust the pressure between the water conveying steel roller 2 and the plate supporting water roller 3, the two second pressure adjusting mechanisms are installed one by one on the driving side and the operating side of the printing machine; each second pressure adjusting mechanism comprises a nut seat 41 and a water roller adjusting screw 40 and the nut seat 41; the nut seat 41 is fixed on the upper rear end face of the water conveying steel roller arm support 200 through a limiting block 42; the end head of the water roller adjusting screw 40 is successively screwed into the nut seat 41 and a threaded hole opened between the upper rear end face of the water conveying steel roller arm support 200 and the upper front end face of the water conveying steel roller arm support 200 and abuts against the rear end face of the water roller arm support 300; the front end of the nut seat 41 is also provided with a butterfly spring 43, the butterfly spring 43 makes the nut seat 41 abut against the rear end face of the water conveying steel roller arm support 200, at the same time the nut seat 41 is limited to rotate and axially move by the limiting block 42; by rotating the water roller adjusting screw 40, the water conveying steel roller arm support 200 swings forward and backward around the arm support bearing seat 20A as the center, and then the pressure between the water conveying steel roller 2 and the plate supporting water roller 3 is adjusted. The two second pressure adjusting mechanisms are independently adjusted.

[0043] Two water tank rubber roller skew adjustment mechanisms are installed on the driving side and the operating side of the printing machine respectively; each water tank rubber roller skew adjustment mechanism comprises a stake head 51 and a skew adjusting screw 50; the stake head 52 is fixed on the inner side of the water transmission steel roller arm frame 200; the head of the skew adjusting screw 50 is screwed into the threaded hole on the lower rear end face of the water tank rubber roller arm frame 100 after passing through the stake head 51, and the skew adjusting screw 50 is fixed with a stop ring 52 in front of and behind the stake head 51 respectively, so that the skew adjusting screw 50 can only rotate but cannot move axially; rotating the skew adjusting screw 50 can push or pull the rear limiting groove 32 and the front limiting groove 31 on the water tank rubber roller arm frame 100 to move forward or backward along the eccentric worm shaft 330 and the pin shaft 36 one by one, and the water tank rubber roller arm frame 100 drives the forward and backward movement of the rubber roller bearing 10, thereby adjusting the contact pressure and contact range between the water tank rubber roller 1 and the water transmission steel roller 2 in the front-rear direction. The two water tank rubber roller skew adjustment mechanisms are independently adjusted. If the water tank rubber roller skew adjustment mechanism arranged on the driving side adjusts the water tank rubber roller 1 to move backward, the water amount on the driving side can be increased; if the water tank rubber roller skew adjustment mechanism arranged on the operating side adjusts the water tank rubber roller 1 to move forward, the water amount on the operating side can be increased; the principle is that after the two ends of the water tank rubber roller 1 cross the two ends of the water transmission steel roller 2 one by one, the pressure of the contact surface between the two ends of the water tank rubber roller 1 and the two ends of the water transmission steel roller 2 changes one by one, thereby realizing the change of the water transmission amount.

[0044] Figure 6a As shown, when the water tank rubber roller skew adjustment mechanism is not adjusted, the water tank rubber roller 1 and the water transmission steel roller 2 are in a straight line full contact state, the center contact distance of the entire water tank rubber roller 1 and the water transmission steel roller 2 is consistent, and the nearest distance is 18 mm; when the driving side end and the operating side end of the water tank rubber roller 1 are adjusted one by one backward and forward after the adjustment of the two water tank rubber roller skew adjustment mechanisms, the center contact distance of the driving side end of the water tank rubber roller 1 and the driving side end of the water transmission steel roller 2 and the center contact distance of the operating side end of the water tank rubber roller 1 and the operating side end of the water transmission steel roller 2 will both increase, such as Figure 6b 18.2 mm, after the center contact distance increases, the contact pressure of the two water rollers will decrease, the water film of the water transmission will relatively become a little thicker, the water transmission amount will change to the large, if the center contact distance exceeds a certain limit, resulting in no pressure between the two water rollers and no contact, the driving side end and the operating side end of the water tank rubber roller 1 will have no water transmission phenomenon respectively, and the water transmission width range of the water tank rubber roller 1 will become narrow.

[0045] The driving mechanism comprises two driving shafts 60 which are inserted into the arm bearing seat 20 on the driving side of the printing machine and the arm bearing seat 20 on the operating side of the printing machine respectively, a driving gear 61 which is installed on the driving shaft on the driving side of the printing machine, an outer driving gear 62 which is installed on the outside of the driving shaft head of the water transmission steel roller 2 and is engaged with the driving gear 61, an inner driving gear 63 which is installed on the inside of the driving shaft head of the water transmission steel roller 2, and a driven gear 64 which is installed on the driving shaft head of the water tank rubber roller 1 and is engaged with the inner driving gear 63.

[0046] The water feeding control device of the printing machine of the present application drives the driving gear 61 to rotate by installing a driving motor on the driving shaft 60 on the driving side of the printing machine, drives the outer driving gear 62 and the inner driving gear 63 to rotate, and drives the driven gear 64 to rotate, thereby driving the water transmission steel roller 2 and the water tank rubber roller 1 to rotate. The rotation of the water tank rubber roller 1 transmits the water in the water tank to the water transmission steel roller 2, the water transmission steel roller 2 transmits the water to the dampening roller 3, the dampening roller 3 transmits the water to the plate cylinder 5, the dampening roller 3 is tangent to the string roller 4, the string roller 4 is used to even the water on the dampening roller 3, and thus the whole rotating and continuous contact water feeding mode is formed.

[0047] The above examples are only used to illustrate the present application and are not limited to the present application. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present application, and all equivalent technical solutions should belong to the scope of the present application, which is defined by the claims.

Claims

1. An upper water control device of a printing machine, comprising a water tank rubber roller, a water transmission steel roller, a register water roller and a string water roller, a first disengaging mechanism, a second disengaging mechanism, two first pressure adjusting mechanisms and two water tank rubber roller skew adjusting mechanisms. Two ends of the water tank rubber roller are respectively and correspondingly installed in top grooves of two water tank rubber roller arm frames through rubber roller bearings. The water transmission steel roller is arranged above the water tank rubber roller, two ends of the water transmission steel roller are respectively and correspondingly installed in upper portions of two water transmission steel roller arm frames through steel roller bearings, the two water transmission steel roller arm frames are respectively and correspondingly located outside the two water tank rubber roller arm frames and inside driving side wall plates and operating side wall plates of the printing machine, middle portions of the two water transmission steel roller arm frames are respectively and correspondingly installed on the driving side wall plates and the operating side wall plates through arm frame bearing seats. The register water roller is arranged in front of the water transmission steel roller, two ends of the register water roller are respectively and correspondingly installed on two water roller arm frames through shaft head bearings, the two water roller arm frames are respectively and correspondingly hinged on inner side surfaces of the driving side wall plates and the operating side wall plates. The string water roller is tangentially arranged below the register water roller, two ends of the string water roller are respectively and correspondingly installed in lower portions of the two water roller arm frames through shaft head bearings. The first disengaging mechanism comprises two first disengaging pneumatic cylinders which are respectively and correspondingly connected to top rear portions of the two water transmission steel roller arm frames, cylinder bodies of the two first disengaging pneumatic cylinders are respectively and correspondingly hinged on inner side surfaces of the driving side wall plates and the operating side wall plates. The second disengaging mechanism comprises two cam connecting rods and two second disengaging pneumatic cylinders. A top surface of the cam connecting rod is a curved surface, the two cam connecting rods are respectively and correspondingly hinged in installation grooves which are vertically communicated with the top grooves and are arranged on inner side surfaces of the two water tank rubber roller arm frames, and the top surfaces of the two cam connecting rods are respectively and correspondingly in contact with bottom surfaces of the two rubber roller bearings. The two second disengaging pneumatic cylinders are respectively and correspondingly connected to lower ends of the two cam connecting rods, cylinder bodies of the two second disengaging pneumatic cylinders are respectively and correspondingly hinged on inner side surfaces of rear lower portions of the two water tank rubber roller arm frames. Two first pressure adjusting mechanisms are installed on the driving side and the operating side of the printing machine respectively; each first pressure adjusting mechanism comprises a front limiting slot, a rear limiting slot, a worm gear mechanism, a worm adjusting shaft and a pin shaft; the front limiting slot is horizontally formed on the lower front end surface of the water tank rubber roller arm frame; the rear limiting slot is horizontally formed on the upper rear end surface of the water tank rubber roller arm frame; the worm gear in the worm gear mechanism is arranged between the outer side surface of the water tank rubber roller arm frame and the inner side surface of the water conveying steel roller arm frame, and the worm gear is installed on an eccentric worm shaft, the inner end of the eccentric worm shaft is inserted into the rear limiting slot; the worm in the worm gear mechanism is installed on the inner side surface of the water conveying steel roller arm frame through a worm support and is engaged with the worm gear; the worm adjusting shaft is coaxially connected to the rear end of the worm; the inner end of the pin shaft is inserted into the front limiting slot, and the outer end of the pin shaft is connected to the front lower end of the water conveying steel roller arm frame. Two water tank rubber roller skew adjusting mechanisms are installed on the driving side and the operating side of the printing machine respectively; each water tank rubber roller skew adjusting mechanism comprises a pile head and a skew adjusting screw; the pile head is fixed on the inner side surface of the water conveying steel roller arm frame; the head of the skew adjusting screw is screwed into a threaded hole formed on the lower rear end surface of the water tank rubber roller arm frame after passing through the pile head, and the skew adjusting screw is further fixed with a stop collar in front of and behind the pile head respectively.

2. The upper water control device of a printing press according to claim 1, characterized in that, The upper water control device further comprises two second pressure adjusting mechanisms installed on the driving side and the operating side of the printing machine respectively; each second pressure adjusting mechanism comprises a nut seat and a water roller adjusting screw; the nut seat is fixed on the upper rear end surface of the water conveying steel roller arm frame; the end of the water roller adjusting screw is screwed into the nut seat and a threaded hole formed between the upper rear end surface of the water conveying steel roller arm frame and the upper front end surface of the water conveying steel roller arm frame in sequence and abuts against the rear end surface of the water roller arm frame.

3. The upper water control device of a printing press according to claim 1, wherein The inner end of the eccentric worm shaft and the inner end of the pin shaft are both provided with a stop collar.

4. The upper water control device of a printing press according to claim 1, wherein The upper water control device further comprises a driving mechanism, which comprises two driving shafts inserted into the arm bearing seat on the driving side of the printing machine and the arm bearing seat on the operating side of the printing machine respectively, a driving gear installed on the driving shaft on the driving side of the printing machine, an outer driving gear installed on the outer part of the driving side shaft head of the water conveying steel roller and engaged with the driving gear, an inner driving gear installed on the inner part of the driving side shaft head of the water conveying steel roller, and a driven gear installed on the driving side shaft head of the water tank rubber roller and engaged with the inner driving gear.

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