A double-sided offset printing machine with variable printing specifications

Abstract

The present invention discloses a double-sided offset printing press with variable printing specifications, comprising an upper plate cylinder, an upper rubber cylinder, a lower rubber cylinder, and a lower plate cylinder arranged in sequence from top to bottom; the upper rubber cylinder and the lower plate cylinder are fixed cylinders; the upper plate cylinder is clutched and pressed with the upper rubber cylinder via an upper clutch mechanism; and the lower rubber cylinder is clutched and pressed with the upper rubber cylinder and the lower plate cylinder respectively via a lower clutch mechanism. The upper clutch mechanism includes a pair of slide rails, a pair of front arm frames, a pair of rear arm frames, an adjustment arm frame, a pair of inner swing arms, two transmission shafts, a pair of outer swing arms, and a pair of clutch cylinders. The structure of the lower clutch mechanism is identical to that of the upper clutch mechanism. The present invention simultaneously meets the requirements of variable printing specifications and double-sided printing, and is simple in structure, easy to adjust, and low in manufacturing cost.

Description

Technical Field

[0001] The invention relates to a double-sided offset printing machine with variable printing specifications. Background Art

[0002] When both sides of a paper need to be printed, the usual method is to print twice. After one side is printed on a single-sided printing press, the paper is manually turned over to print the other side. Another method is to use a double-sided printing press. The paper enters the double-sided printing press once to complete the printing on both sides. A color group of this double-sided printing press contains at least four printing rollers, namely the upper plate roller 11, the lower plate roller 12, the upper rubber roller 21 and the lower rubber roller 22. The graphic ink on the upper plate roller 11 and the lower plate roller 12 are transferred to the upper rubber roller 21 and the lower rubber roller 22 respectively. When the paper passes between the upper rubber roller 21 and the lower rubber roller 22, one color printing on each side of the front and back is completed at the same time (see Figure 1 To meet the ever-changing demands for printed product specifications, printing presses with various variable printing specifications are needed. When the cutting specifications (print size) of a printing press are required to be variable, the diameters of the four printing cylinders mentioned above must be changed, and therefore the center distance between the four printing cylinders must also be adjusted. The clutch mechanisms of the printing cylinders in existing printing presses are mostly implemented using cylinders, connecting rod mechanisms, and eccentric seats. These clutch mechanisms have the following disadvantages: 1. Low precision and cumulative errors; 2. Applicable only to single-sided printing presses; 3. Printing specifications cannot be changed. Summary of the Invention

[0003] The object of the present invention is to overcome the defects of the prior art and provide a double-sided offset printing machine with variable printing specifications, which meets the requirements of variable printing specifications and double-sided printing at the same time.

[0004] The object of the present invention is achieved as follows: A double-sided offset printing press with variable printing specifications comprises an upper plate cylinder, an upper rubber cylinder, a lower rubber cylinder and a lower plate cylinder arranged in sequence from top to bottom; the upper rubber cylinder and the lower plate cylinder are fixed cylinders; the upper plate cylinder is clutched and pressed with the upper rubber cylinder through an upper clutch mechanism; the lower rubber cylinder is clutched and pressed with the upper rubber cylinder and the lower plate cylinder respectively through a lower clutch mechanism; wherein,

[0005] The upper clutch mechanism includes a pair of slide rails, a pair of front arm frames, a pair of rear arm frames, an adjustment arm frame, a pair of inner swing arms, two transmission shafts, a pair of outer swing arms and a pair of clutch cylinders;

[0006] A pair of slide rails are installed in grooves on the inner side surfaces of the two side wall panels of the double-sided offset printing press in a one-to-one correspondence with the height position of the upper plate cylinder, and each slide rail is equipped with a front slider, a rear slider and an adjustment slider;

[0007] A pair of front arm frames are fixed on the two front sliders in a one-to-one correspondence; a pair of rear arm frames are fixed on the two rear sliders in a one-to-one correspondence, and the rear ends of the pair of front arm frames and the front ends of the pair of rear arm frames are fixed in a one-to-one correspondence to the two ends of the core shaft of the upper plate cylinder;

[0008] A pair of adjustment arms are fixed on the two adjustment slide blocks in a one-to-one correspondence; the front ends of the pair of adjustment arms are respectively connected to the rear ends of the pair of rear arms in a one-to-one correspondence through an adjustment screw;

[0009] The front portions of the pair of inner swing arms are respectively hinged to the rear portions of the pair of adjustment arm frames through a connecting rod;

[0010] Two transmission shafts are mounted on the two side wall panels of the double-sided offset printing machine in a one-to-one correspondence and are inserted into the shaft holes opened at the rear of a pair of inner swing arms in a one-to-one correspondence;

[0011] A pair of outer swing arms are provided on the outer sides of the wall panels on both sides of the double-sided offset printing machine in a one-to-one correspondence and are rotatably mounted on the two transmission shafts;

[0012] A pair of clutch cylinders are mounted on the outer sides of the wall panels on both sides of the double-sided offset printing machine in a one-to-one correspondence, and the piston rods of the pair of clutch cylinders are hinged to the pair of outer swing arms in a one-to-one correspondence;

[0013] The structure of the lower clutch mechanism is the same as that of the upper clutch mechanism.

[0014] The above-mentioned double-sided offset printing press with variable printing specifications, wherein the upper clutch mechanism also includes two limit piles which are installed one-to-one on the inner side surfaces of the two side wall panels of the double-sided offset printing press and are located below a pair of the inner swing arms, and each of the two limit piles is installed with a limit screw with the end facing upward.

[0015] The double-sided offset printing machine with variable printing specifications of the present invention has the following characteristics:

[0016] 1. By setting the upper rubber roller and the lower plate roller as fixed rollers, the upper plate roller is clutched and pressed with the upper rubber roller through the upper clutch mechanism, and the lower rubber roller is clutched and pressed with the upper rubber roller and the lower plate roller respectively through the lower clutch mechanism, and the structure of the upper clutch mechanism is the same as that of the lower clutch mechanism, and the clutch cylinder is used to push the outer swing arm and the inner swing arm, and the inner swing arm pushes the slider installed on the slide rail to move back and forth through the connecting rod, forming a crank slider mechanism, and the slider is connected to the arm fixed at both ends of the roller core shaft, while meeting the requirements of variable printing specifications and double-sided printing.

[0017] 2. The present invention is not only simple in structure and easy to adjust, but also has low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a double-sided offset printing machine of the prior art;

[0019] Figure 2 It is a side view of the arrangement structure of four printing cylinders of a double-sided offset printing press with variable printing specifications of the present invention;

[0020] Figure 3 This is a schematic structural diagram of a double-sided offset printing press with variable printing specifications according to the present invention (inside of a wall panel, in a closed-press state);

[0021] Figure 4 yes Figure 3 AA view in the;

[0022] Figure 5 This is a schematic structural diagram of a double-sided offset printing press with variable printing specifications according to the present invention (outside of the wall panel, in the pressed state);

[0023] Figure 6 It is a structural schematic diagram of a double-sided offset printing press with variable printing specifications of the present invention (inside of the wall panel, in the off-press state);

[0024] Figure 7 It is a structural schematic diagram of a double-sided offset printing press with variable printing specifications of the present invention (outside of the wall panel, in the off-press state); DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] See also Figures 2 to 7 The present invention provides a double-sided offset printing press with variable printing specifications, comprising an upper plate cylinder 11, an upper rubber cylinder 21, a lower rubber cylinder 22 and a lower plate cylinder 12 arranged in sequence from top to bottom; wherein,

[0027] The upper rubber cylinder 21 and the lower plate cylinder 12 are fixed cylinders;

[0028] The upper plate cylinder 11 is clutched and pressed with the upper rubber cylinder 21 through the upper clutch mechanism;

[0029] The lower rubber cylinder 22 is clutched and pressed with the upper rubber cylinder 21 and the lower plate cylinder 12 respectively through the lower clutch mechanism.

[0030] The upper clutch mechanism includes a pair of upper slide rails 1A, a pair of upper front arms 3A, a pair of upper rear arms 4A, an upper adjustment arm 5A, a pair of upper inner swing arms 6A, two upper transmission shafts 7A, a pair of upper outer swing arms 8A, a pair of upper clutch cylinders 9A and two upper limit pile heads 10A; wherein,

[0031] A pair of upper slide rails 1A are installed horizontally in grooves formed on the inner side surfaces of the side wall panels 100 of the perfect offset printing press, corresponding to the height position of the upper plate cylinder 11 and corresponding to each other. Each upper slide rail 1A is equipped with an upper front slider 21A, an upper rear slider 22A, and an upper adjustment slider 23A.

[0032] A pair of upper front arms 3A are fixed to the two upper front sliders 21A in a one-to-one correspondence; a pair of upper rear arms 4A are fixed to the two upper rear sliders 22A in a one-to-one correspondence, and the rear ends of the pair of upper front arms 3A and the front ends of the pair of upper rear arms 4A are fixed to the two ends of the core shaft of the upper plate cylinder 11 in a one-to-one correspondence.

[0033] A pair of upper adjustment arms 5A are fixed on the two upper adjustment sliders 23A in a one-to-one correspondence; the front ends of the pair of upper adjustment arms 5A are each connected to the rear ends of the pair of upper rear arms 4A in a one-to-one correspondence via an upper adjustment screw 50A;

[0034] The front portion of a pair of upper inner swing arms 6A is respectively hinged to the rear portion of a pair of upper adjustment arm brackets 5A via an upper connecting rod 60A;

[0035] The two upper transmission shafts 7A are mounted one-to-one on the two side wall panels 100 of the double-sided offset printing press and are inserted one-to-one into the shaft holes opened at the rear of the pair of upper inner swing arms 6A;

[0036] A pair of upper outer swing arms 8A are provided on the outer sides of the wall panels 100 on both sides of the double-sided offset printing machine in a one-to-one correspondence and are rotatably mounted on the two upper transmission shafts 7A;

[0037] A pair of upper clutch cylinders 9A are mounted one-to-one on the outer sides of the two side wall panels 100 of the double-sided offset printing press, and the piston rods of the pair of upper clutch cylinders 9A are hinged to the pair of upper outer swing arms 8A one-to-one.

[0038] Two upper limit pile heads 10A are mounted one-to-one on the inner side surfaces of the wall panels 100 on both sides of the double-sided offset printing machine and are located below a pair of upper inner swing arms 6A. A limit screw with its end facing upward is mounted on each of the two upper limit pile heads 10A.

[0039] The lower clutch mechanism includes a pair of lower rails 1B, a pair of lower front arms 3B, a pair of lower rear arms 4B, a lower adjustment arm 5B, a pair of lower inner swing arms 6B, two lower transmission shafts 7B, a pair of lower outer swing arms 8B, a pair of lower clutch cylinders 9B and two lower limit pile heads 10B; wherein,

[0040] A pair of lower rails 1B are installed horizontally in grooves on the inner side surfaces of the wall panels 100 on both sides of the double-sided offset printing press, corresponding to the height positions of the lower rubber cylinders 22B. Each lower rail 1B is equipped with a lower front slider 21B, a lower rear slider 22B and a lower adjustment slider 23B.

[0041] A pair of lower front arm frames 3 are fixed on the two lower front sliders 21B in a one-to-one correspondence; a pair of lower rear arm frames 4B are fixed on the two lower rear sliders 22B in a one-to-one correspondence, and the rear ends of the pair of lower front arm frames 3 and the front ends of the pair of lower rear arm frames 4B are fixed in a one-to-one correspondence to the two ends of the core shaft of the lower rubber roller 22;

[0042] A pair of lower adjustment arms 5B are fixed on the two lower adjustment sliders 23B in a one-to-one correspondence; the front ends of the pair of lower adjustment arms 5B are each connected to the rear ends of the pair of lower rear arms 4B in a one-to-one correspondence via a lower adjustment screw 50B;

[0043] The front portions of the pair of lower inner swing arms 6B are respectively hinged to the rear portions of the pair of lower adjustment arm brackets 5B via a lower connecting rod 60B;

[0044] The two lower transmission shafts 7B are mounted on the two side wall panels 100 of the double-sided offset printing press in a one-to-one correspondence and are inserted into the shaft holes opened at the rear of the pair of lower inner swing arms 6B in a one-to-one correspondence;

[0045] A pair of lower outer swing arms 8B are provided on the outer sides of the wall panels 100 on both sides of the double-sided offset printing machine in a one-to-one correspondence and are rotatably mounted on the two lower transmission shafts 7B;

[0046] A pair of lower clutch cylinders 9B are mounted one-to-one on the outer sides of the two side wall panels 100 of the double-sided offset printing press, and the piston rods of the pair of lower clutch cylinders 9B are hinged to the pair of lower outer swing arms 8B one-to-one.

[0047] The two lower limit pile heads 10B are correspondingly installed on the inner side surfaces of the two side wall panels 100 of the double-sided offset printing machine and are located below a pair of lower inner side swing arms 6B. A limit screw with the end facing upward is installed on each of the two lower limit pile heads 10B.

[0048] In the process of installing the clutch mechanism of the double-sided offset printing machine with variable printing specifications of the present invention, it is necessary to first extend the piston rods of a pair of upper clutch cylinders 9A to the maximum stroke, and make a pair of upper inner swing arms 6A and a pair of upper slide rails 1A in a straight line, and then adjust the limit screw on the upper limit pile head 10A so that the end of the limit screw is against the lower end surface of the upper inner swing arm 6A, and then tighten the nut on the limit screw to limit the upper inner swing arm 6A from rotating downward with the upper transmission shaft 7A as the rotation center, so that the upper inner swing arm 6A always maintains this state, and then use pins to fix the upper inner swing arm 6A and the upper outer swing arm 8A on the upper transmission shaft 7A. Because the diameters of the upper plate cylinder 11, upper rubber cylinder 21, lower rubber cylinder 22, and lower plate cylinder 12 are different when printing products of different specifications, the center positions of the upper plate cylinder 11, upper rubber cylinder 21, lower rubber cylinder 22, and lower plate cylinder 12 are also different. Therefore, a mechanism is required to adjust the center position of each cylinder. Specifically, an upper adjustment screw 50A is added between the upper rear slider 22A (upper rear arm 4A) and an upper adjustment slider 23A (upper adjustment arm 5A). By rotating the lower adjustment screw 50A, the position of the upper plate cylinder 11 and the pressure between the upper plate cylinder 11 and the upper rubber cylinder 21 are adjusted to achieve the desired printing pressure. After adjusting the pressure between the upper plate cylinder 11 and the upper rubber cylinder 21, the entire upper clutch mechanism is basically installed, and the upper clutch cylinder 9A can now be controlled. When the piston rod of the upper clutch cylinder 9A contracts, the upper plate cylinder 11 will drive the upper adjustment arm 5A, the upper rear arm 4A and the upper front arm 3A to move backward on the upper slide rail 1A along with the upper outer swing arm 8A and the upper inner swing arm 6A, thereby realizing the separation and pressure-releasing action with the upper rubber cylinder 21 (see FIG. Figure 5 and Figure 6 ); When the piston rod of the upper clutch cylinder 9A extends, the upper plate cylinder 11 will follow the upper outer swing arm 8A and the upper inner swing arm 6A to drive the upper adjustment arm 5A, the upper rear arm 4A and the upper front arm 3A to move forward on the upper slide rail 1A, thereby achieving a pressing action with the upper rubber cylinder 21 (see Figure 2 and Figure 4 ).

[0049] Similarly, when installing the upper clutch mechanism, the lower clutch mechanism must also be installed. It is also necessary to first extend the piston rods of a pair of lower clutch cylinders 9B to the maximum stroke, and make the pair of lower inner swing arms 6B and the pair of lower rails 1B in a straight line, then adjust the limit screw on the lower limit pile head 10B so that the end of the limit screw is against the lower end surface of the lower inner swing arm 6B, and then tighten the nut on the limit screw to limit the lower inner swing arm 6B from rotating downward with the lower transmission shaft 7B as the rotation center, so that the lower inner swing arm 6B always maintains this state, and then use the pin to fix the lower inner swing arm 6B and the lower outer swing arm 8B are fixedly mounted on the lower transmission shaft 7B, and then the lower adjusting screw 50B is rotated to adjust the position of the lower rubber roller 22 and the pressure between the lower rubber roller 22 and the upper rubber roller 21 and the lower plate cylinder 12, so that the lower rubber roller 22, the upper rubber roller 21 and the lower plate cylinder 12 obtain the required printing pressure. After adjusting the pressure between the lower rubber roller 22, the upper rubber roller 21 and the lower plate cylinder 12, the entire lower clutch mechanism is basically installed, and the lower clutch cylinder 9B can be controlled at this time. When the piston rod of the lower clutch cylinder 9B contracts, the lower rubber roller 22 will drive the lower adjustment arm frame 5B, the lower rear arm frame 4B and the lower front arm frame 3B to move backward on the lower rail 1B along with the lower outer swing arm 8B and the lower inner swing arm 6B, thereby realizing the pressure-releasing action with the upper rubber roller 21 and the lower plate cylinder 12 (see Figure 5 and Figure 6 ); When the piston rod of the lower clutch cylinder 9A extends, the lower rubber roller 22 will follow the upper outer swing arm 8B and the upper inner swing arm 6B to drive the upper adjustment arm 5B, the upper rear arm 4B and the upper front arm 3B to move forward on the lower rail 1B, realizing the pressing action with the upper rubber roller 21 and the lower plate cylinder 12 (see Figure 2 and Figure 4 ).

[0050] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A double-sided offset printing press with variable printing specifications, comprising an upper plate cylinder, an upper rubber cylinder, a lower rubber cylinder, and a lower plate cylinder arranged in sequence from top to bottom; the upper rubber cylinder and the lower plate cylinder are fixed cylinders; the upper plate cylinder is clutched and pressed with the upper rubber cylinder via an upper clutch mechanism; the lower rubber cylinder is clutched and pressed with the upper rubber cylinder and the lower plate cylinder respectively via a lower clutch mechanism; characterized in that: The upper clutch mechanism includes a pair of slide rails, a pair of front arm frames, a pair of rear arm frames, an adjustment arm frame, a pair of inner swing arms, two transmission shafts, a pair of outer swing arms and a pair of clutch cylinders; A pair of slide rails are installed in grooves on the inner side surfaces of the two side wall panels of the double-sided offset printing press in a one-to-one correspondence with the height position of the upper plate cylinder, and each slide rail is equipped with a front slider, a rear slider and an adjustment slider; A pair of front arm frames are fixed on the two front sliders in a one-to-one correspondence; a pair of rear arm frames are fixed on the two rear sliders in a one-to-one correspondence, and the rear ends of the pair of front arm frames and the front ends of the pair of rear arm frames are fixed in a one-to-one correspondence to the two ends of the core shaft of the upper plate cylinder; A pair of adjustment arms are fixed on the two adjustment slide blocks in a one-to-one correspondence; the front ends of the pair of adjustment arms are respectively connected to the rear ends of the pair of rear arms in a one-to-one correspondence through an adjustment screw; The front portions of the pair of inner swing arms are respectively hinged to the rear portions of the pair of adjustment arm frames through a connecting rod; Two transmission shafts are mounted on the two side wall panels of the double-sided offset printing machine in a one-to-one correspondence and are inserted into the shaft holes opened at the rear of a pair of inner swing arms in a one-to-one correspondence; A pair of outer swing arms are provided on the outer sides of the wall panels on both sides of the double-sided offset printing machine in a one-to-one correspondence and are rotatably mounted on the two transmission shafts; A pair of clutch cylinders are mounted on the outer sides of the wall panels on both sides of the double-sided offset printing machine in a one-to-one correspondence, and the piston rods of the pair of clutch cylinders are hinged to the pair of outer swing arms in a one-to-one correspondence; The structure of the lower clutch mechanism is the same as that of the upper clutch mechanism.

2. The double-sided offset printing machine with variable printing specifications according to claim 1, characterized in that: The upper clutch mechanism also includes two limit piles which are installed one by one on the inner side surfaces of the two side wall panels of the double-sided offset printing machine and are located below a pair of inner swing arms. Each of the two limit piles is installed with a limit screw with the end facing upward.

Images