Five-color offset press

Abstract

The invention relates to the technical field of offset presses, in particular to a five-color offset press which comprises five offset printing sets, a paint box is arranged above each offset printing set, a paint trolley used for adding paint into the paint boxes is arranged beside the paint boxes, and a lifting structure used for driving the paint trolley to ascend and descend is arranged beside each offset printing set. A guide rail is connected to the lower end of the lifting structure, the pigment vehicle can move along the guide rail, a pigment bin is arranged at the end, away from the lifting structure, of the guide rail, partition plates are arranged in the pigment bin to divide the pigment bin into five parts, and a feeding structure used for adding pigment in the pigment bin into the pigment vehicle is arranged above the pigment bin. The effect that pigment adding of the offset press is more convenient is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of offset printing presses, and in particular to a five-color offset printing press. Background Art

[0002] An offset press is a type of lithographic printing press. During printing, the printed image is first printed from the printing plate onto a rubber cylinder, and then transferred to the paper by the rubber cylinder. Offset presses can be divided into single-color, two-color, four-color and multi-color presses according to the number of colors printed in one pass. A five-color offset press is an offset press with five printing units.

[0003] The pigment box of the existing offset printing machine is generally arranged above the offset printing machine, and the pigment box of the five-color offset printing machine is divided into five. This results in that different pigments need to be added to the corresponding offset printing units manually when loading the offset printing machine. Moreover, since the pigment boxes are generally above the offset printing machine, workers need to lift the pigment higher when adding pigment, which makes the pigment addition of the offset printing machine more troublesome. Summary of the invention

[0004] In order to make the addition of pigment to an offset printing press more convenient, the present application provides a five-color offset printing press.

[0005] The above technical objectives of this application are achieved through the following technical solutions: A five-color offset printing machine comprises five offset printing groups, each of which is provided with a paint box above it, a paint cart for adding paint into the paint box next to the paint box, a lifting structure for driving the paint cart to lift up and down is provided next to each offset printing group, a guide rail is connected to the lower end of the lifting structure, the paint cart can move along the guide rail, a paint bin is provided at one end of the guide rail away from the lifting structure, a partition plate is provided inside the paint bin to divide the paint bin into five parts, and a loading structure for adding the paint in the paint bin into the paint cart is provided above the paint bin.

[0006] By adopting the above scheme, when it is necessary to add pigment to the offset printing group, the pigment cart moves with the lifting structure to the guide rail, and then moves along the guide rail to the feeding structure, and then the feeding structure adds the corresponding pigment in the pigment bin into the pigment cart, and then the pigment cart moves along the guide rail to the corresponding lifting structure, and rises to the pigment box with the lifting structure, and then the pigment in the pigment cart is introduced into the pigment box, thereby completing the addition of pigment, and the operator only needs to add the corresponding pigment to the pigment bin, and because the pigment bin is set at a lower position, it is more convenient for the operator to add pigment.

[0007] Optionally, a turntable is arranged between the guide rail and the feeding structure, the turntable is connected to a motor for driving the turntable to rotate, five parking slots are arranged at the edge of the upper surface of the turntable, and the five parking slots are respectively opposite to the five guide rails, and the paint truck can enter the parking slots along the guide rails.

[0008] By adopting the above solution, when the paint cart moves into the parking slot, the motor drives the turntable to rotate, so that the paint cart moves to a position facing the feeding structure, so that the feeding structure can feed the paint cart more accurately.

[0009] Optionally, the feeding structure includes a first liquid pump, a feed pipe and a discharge pipe, the first liquid pump is located in the pigment bin, the feed pipe is connected to the liquid inlet of the first liquid pump, and the feed pipe is located in the pigment bin, the discharge pipe is connected to the discharge port of the first liquid pump, the end of the discharge pipe facing away from the first liquid pump is located above the turntable, the pigment bin is a cylinder, and the pigment bin is connected to a bin rotating motor that drives the raw material bin to rotate.

[0010] By adopting the above scheme, the pigment bin rotates to rotate the part where the required pigment is located to face the turntable, and then the turntable rotates to rotate the pigment cart under the discharge pipe, and then the first liquid pump extracts the pigment in the pigment bin into the pigment cart, thereby realizing the loading of the pigment cart, and the pigment bin rotates, so that the operator only needs to add all the pigments in the pigment bin in one place.

[0011] Optionally, the paint cart includes an electric vehicle board and a paint box, a feed port is provided above the paint box, slide grooves are provided on opposite sides of the feed port, a door panel is slidably connected in the slide groove, the door panel is connected to a toggle block, and an elastic member is provided above the paint box, the two ends of the elastic member are respectively connected to the paint box and the toggle block, the discharge pipe is a hard pipe, when the paint cart is located on the turntable, the turntable rotates to drive the paint cart to move, and during the rotation process, the discharge pipe contacts the toggle block, so that the discharge pipe opens the door panel.

[0012] By adopting the above scheme, when the pigment bin adds pigment into the pigment box, first the cavity corresponding to the pigment bin is rotated to face the turntable, and then the turntable drives the pigment cart to rotate under the discharge pipe, and at the same time the toggle block contacts the discharge pipe, so that the discharge pipe blocks the rotation of the toggle block, thereby causing the discharge pipe to open the door panel, so that the pigment in the pigment bin can smoothly enter the pigment box along the discharge pipe, thereby making the loading of the five-color offset printing machine more convenient.

[0013] Optionally, the lifting structure includes a lifting bracket, a threaded rod is rotatably connected inside the lifting bracket, and a lifting motor is fixedly connected to one end of the threaded rod to drive the threaded rod to rotate, a lifting groove is opened on one side of the lifting bracket, a lifting frame is slidably connected in the lifting groove, one end of the lifting frame is connected to a threaded sleeve, the threaded sleeve is threadedly connected to the threaded rod, and a clamping structure for clamping the paint cart is connected to the end of the lifting frame away from the threaded sleeve.

[0014] By adopting the above scheme, when the paint cart moves to the position below the lifting bracket, the clamping structure clamps the paint cart, and then the lifting motor rotates, thereby driving the threaded rod to rotate, so that the threaded sleeve moves upward along the threaded rod, thereby driving the lifting bracket to move upward and driving the paint cart to move upward, making it easier to introduce the paint in the paint cart into the paint box.

[0015] Optionally, a plug rod is provided on one side of the lifting frame connected to the clamping structure, and a socket is provided on one end of the electric vehicle board close to the lifting frame. When the electric vehicle board moves to the position of the lifting frame, the plug rod is inserted into the socket.

[0016] By adopting the above solution, when the paint cart moves to the position of the lifting frame, the insertion rod is inserted into the insertion hole, so that the lifting frame provides support for the paint cart when it rises and limits the paint cart, thereby reducing shaking of the paint cart when it is lifted.

[0017] Optionally, the clamping structure includes a rotating motor fixedly connected to the lifting frame, the output shaft of the rotating motor is fixedly connected to a clamping plate, and a wing plate is arranged on the surface of the electric vehicle board close to the lifting frame. When the electric vehicle board contacts the lifting frame, the rotating motor drives the clamping plate to rotate, so that the clamping plate and the lifting frame clamp the wing plate in the middle.

[0018] By adopting the above scheme, when the electric vehicle board moves to the position of the lifting frame, the insertion rod is inserted into the insertion hole, and then the motor is rotated to drive the card plate to rotate, so that the card plate and the lifting frame clamp the wing plate in the middle, thereby preventing the electric vehicle board from being displaced in the horizontal direction during the lifting process.

[0019] Optionally, the wing plate is inclined at one end away from the lifting frame.

[0020] By adopting the above scheme, when the rotating motor drives the card plate to rotate, if the electric vehicle board has not moved into place, the card plate may be stuck by the wing plate. Therefore, the wing plate is set to an inclined surface away from the lifting frame. If the electric vehicle board has not moved into place, the card plate contacts the inclined surface, driving the electric vehicle board to move into place, so that the card plate can stick the wing plate more smoothly, and the wing plate is set to an inclined surface at one end away from the lifting frame to reduce the friction between the wing plate and the card plate.

[0021] Optionally, a material collection port is provided above the paint box, and a material collection door is hinged at the material collection port, and a torsion spring is connected to the hinge shaft of the material collection door. The paint box is connected to a second liquid pump, and the suction pipe of the second liquid pump is located directly above the material collection port. When the paint box reaches the highest point, the suction pipe of the second liquid pump pushes the material collection door open.

[0022] By adopting the above solution, when the paint box moves upward along the lifting structure, the suction pipe of the second liquid pump pushes open the material extraction door, so that the suction pipe is inserted into the paint box, thereby extracting the paint in the paint box into the paint box, thereby completing the addition of paint.

[0023] Optionally, a cover plate is hinged on the top of the pigment bin.

[0024] By adopting the above solution, dust in the air can be prevented from entering the pigment bin.

[0025] In summary, this application has the following technical effects: By setting up the paint cart, the paint bin and the lifting structure, when adding paint, the operator only needs to add the paint into the paint cart, and make the paint cart reach the paint box along the lifting structure, and add the paint in the paint cart into the paint box, so as to complete the addition of paint, thereby making the addition of paint to the offset printing machine more convenient; By setting a turntable, multiple paint carts can be moved more accurately under the feeding structure, making the feeding of the feeding structure smoother; By arranging a lifting motor and a threaded rod, the lifting frame can drive the paint cart to lift and lower, so that the paint cart can introduce the paint into the paint box. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of this application; Figure 2 This is a partial structural diagram of the structure of the pigment bin that this application intends to emphasize; Figure 3 This is a partial structural diagram of the structure on the turntable that this application intends to emphasize; Figure 4 yes Figure 3 A partial enlarged view of the structure at A in the middle; Figure 5 This is a partial structural cross-sectional view of the lifting structure intended to be emphasized in this application; Figure 6 This application intends to emphasize the partial structural diagram of the second liquid pump.

[0027] In the figure, 1, offset printing group; 2, paint box; 21, second liquid pump; 3, lifting structure; 31, lifting bracket; 32, threaded rod; 321, lifting motor; 33, lifting frame; 331, threaded sleeve; 332, plug rod; 4, clamping structure; 41, rotating motor; 42, card plate; 5, paint cart; 51, paint box; 512, door panel; 513, toggle block; 514, material taking door; 52, electric car board; 521, jack; 522, wing plate; 6, guide rail; 7, turntable; 71, parking slot; 8, feeding structure; 81, first liquid pump; 82, feed pipe; 83, discharge pipe; 9, paint bin; 91, cover plate. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the accompanying drawings.

[0029] Reference Figure 1 A five-color offset printing machine includes five offset printing groups 1, each of which is provided with a paint box 2 above, a paint cart 5 for adding paint into the paint box 51 next to the paint box 51, a lifting structure 3 for driving the paint cart 5 to rise and fall next to each offset printing group 1, a guide rail 6 is connected to the lower end of the lifting structure 3, the paint cart 5 can move along the guide rail 6, a paint bin 9 is provided at the end of the guide rail 6 away from the lifting structure 3, a partition plate is provided inside the paint bin 9 to divide the paint bin 9 into five parts, and a feeding structure 8 for adding the paint in the paint bin 9 into the paint cart 5 is provided above the paint bin 9. When it is necessary to add pigment to the offset printing group 1, the pigment cart 5 moves with the lifting structure 3 to the guide rail 6, and then moves along the guide rail 6 to the feeding structure 8. Then the feeding structure 8 adds the corresponding pigment in the pigment bin 9 into the pigment cart 5. Then the pigment cart 5 moves along the guide rail 6 to the corresponding lifting structure 3, and rises to the pigment box 2 with the lifting structure 3. Then the pigment in the pigment cart 5 is introduced into the pigment box 51, thereby completing the addition of pigment. The operator only needs to add the corresponding pigment to the pigment bin 9, and since the pigment bin 9 is set at a lower position, it is more convenient for the operator to add pigment.

[0030] Reference Figure 1 and Figure 2 The pigment bin 9 is a cylinder with a groove on the top, and a cover plate 91 is hinged on the top of the pigment bin 9 to prevent dust from entering the pigment bin 9 and polluting the pigment. The pigment bin 9 is connected to a bin rotating motor that drives the pigment bin 9 to rotate, so that the pigment bin 9 can rotate. When pigment needs to be added, the pigment bin 9 can be rotated to facilitate the addition of pigment. The feeding structure 8 is provided with five groups, and each group of feeding structures 8 corresponds to a pigment. The feeding structure 8 includes a first liquid pump 81, a feed pipe 82 and a discharge pipe 83. The first liquid pump 81 is located in the pigment bin 9, and the feed pipe 82 is connected to the liquid inlet of the first liquid pump 81, and the feed pipe 82 is located in the pigment bin 9. The discharge pipe 83 is connected to the discharge port of the first liquid pump 81, and the end of the discharge pipe 83 away from the first liquid pump 81 is located above the turntable 7. The pigment bin 9 is a cylinder, and the pigment bin 9 is connected to a bin rotating motor that drives the raw material bin to rotate. The pigment bin 9 rotates to rotate the portion where the required pigment is located to face the pigment cart 5 , and then the first liquid pump 81 extracts the pigment in the pigment bin 9 into the pigment cart 5 , thereby achieving the loading of the pigment cart 5 .

[0031] Reference Figure 1 and Figure 2 A receiving trough is rotatably connected to the outside of the pigment bin 9, and the receiving trough is connected to a waste collection box through a pipeline. Since the pigment has a certain viscosity, part of the pigment may stick to the inner wall of the discharge pipe 83 during loading and fall slowly. The receiving trough is provided to prevent the pigment from scattering and dripping, and to collect the pigment.

[0032] Reference Figure 3 A turntable 7 is provided between the guide rail 6 and the pigment bin 9, and the turntable 7 is connected to a motor for driving the turntable 7 to rotate. Five parking slots 71 are provided at the edge of the upper surface of the turntable 7, and the five parking slots 71 are respectively opposite to the five guide rails 6, so that the pigment cart 5 can enter the parking slots 71 along the guide rails 6. When the pigment cart 5 drives into the corresponding parking slot 71, the turntable 7 rotates, thereby driving the pigment cart 5 to move, so that the pigment cart 5 rotates to the right below the discharge pipe 83, and then the first liquid pump 81 adds the pigment in the pigment bin 9 into the pigment cart 5, making it more convenient to add pigment to the pigment cart 5.

[0033] Reference Figure 3 and Figure 4 The paint cart 5 includes an electric vehicle board 52 and a paint box 51. A feed port is provided above the paint box 51, and slide grooves are provided on opposite sides of the feed port. A door panel 512 is slidably connected in the slide groove, and a toggle block 513 is connected to the door panel 512. An elastic member is provided above the paint box 51, and both ends of the elastic member are respectively connected to the paint box 51 and the toggle block 513. The discharge pipe 83 is a hard pipe. When the paint cart 5 is located on the turntable 7, the turntable 7 rotates to drive the paint cart 5 to move, and during the rotation process, the discharge pipe 83 contacts the toggle block 513, so that the discharge pipe 83 opens the door panel 512. When the paint bin 9 adds paint to the paint box 51, first rotate the cavity corresponding to the paint bin 9 to face the turntable 7, then the turntable 7 drives the paint cart 5 to rotate to under the discharge pipe 83, and at the same time, the toggle block 513 contacts the discharge pipe 83, so that the discharge pipe 83 blocks the toggle block 513 from rotating, so that the discharge pipe 83 opens the door panel 512, so that the paint in the paint bin 9 can smoothly enter the paint box 51 along the discharge pipe 83, and after the paint is added, the door panel 512 is closed to prevent dust from entering the paint box 51.

[0034] Reference Figure 5 The lifting structure 3 includes a lifting bracket 31, a threaded rod 32 is rotatably connected inside the lifting bracket 31, and a lifting motor 321 for driving the threaded rod 32 to rotate is fixedly connected at one end of the threaded rod 32. A lifting slot is provided on one side of the lifting bracket 31, and a lifting frame 33 is slidably connected in the lifting slot. A threaded sleeve 331 is connected at one end of the lifting frame 33, and the threaded sleeve 331 is threadedly connected to the threaded rod 32. A clamping structure 4 for clamping the paint cart 5 is connected at one end of the lifting frame 33 away from the threaded sleeve 331. When the paint cart 5 moves to the position below the lifting bracket 31, the clamping structure 4 clamps the paint cart 5, and then the lifting motor 321 rotates, thereby driving the threaded rod 32 to rotate, so that the threaded sleeve 331 moves upward along the threaded rod 32, thereby driving the lifting frame 33 to move upward, thereby driving the paint cart 5 to move upward, so as to facilitate the introduction of the paint in the paint cart 5 into the paint box 2.

[0035] Reference Figure 5 and Figure 6 The clamping structure 4 includes a rotating motor 41 fixedly connected to the lifting frame 33, the output shaft of the rotating motor 41 is fixedly connected to the clamping plate 42, and a wing plate 522 is arranged on the surface of the electric vehicle plate 52 close to the lifting frame 33. The wing plate 522 is inclined on the side away from the lifting frame 33. When the electric vehicle plate 52 contacts the lifting frame 33, the rotating motor 41 drives the clamping plate 42 to rotate, so that the clamping plate 42 and the lifting frame 33 clamp the wing plate 522 in the middle. A plug rod 332 is provided on one side of the lifting frame 33 connected to the clamping structure 4, and a socket 521 is provided on the end of the electric vehicle board 52 close to the lifting frame 33. When the electric vehicle board 52 moves to the position of the lifting frame 33, the plug rod 332 is inserted into the socket 521, and then the rotating motor 41 rotates, driving the clamping plate 42 to rotate, so that the clamping plate 42 and the lifting frame 33 clamp the wing plate 522 in the middle, and the wing plate 522 is inclined away from the side of the lifting frame 33, so that the clamping plate 42 can clamp the wing plate 522 more smoothly, and reduce the friction between the wing plate 522 and the clamping plate 42, thereby avoiding displacement of the electric vehicle board 52 during the lifting process.

[0036] Reference Figure 6 A material taking port is provided above the paint box 51, and a material taking door 514 is hinged at the material taking port, and a torsion spring is connected to the hinge shaft of the material taking door 514. The paint box 2 is connected to a second liquid pump 21, and a suction pipe of the second liquid pump 21 is located directly above the material taking port. When the paint box 2 reaches the highest point, the suction pipe of the second liquid pump 21 pushes open the material taking door 514, so that the suction pipe is inserted into the paint box 51, thereby extracting the paint in the paint box 51 into the paint box 2, thereby completing the addition of paint.

[0037] The specific implementation principle of the present application is as follows: when the pigment in the paint box 2 needs to be added, the rotating bin motor drives the pigment bin 9 to rotate, so that the corresponding pigment rotates to the position facing the turntable 7, and then the corresponding pigment cart 5 moves to the corresponding parking slot 71 on the turntable 7, and then the motor drives the turntable 7 to rotate, so that the pigment cart 5 moves to the bottom of the discharge pipe 83, and at the same time the discharge pipe 83 abuts against the surface of the toggle block 513, driving the door panel 512 to open, and then the first liquid pump 81 draws the pigment in the pigment bin 9 into the pigment box 51, and then the turntable 7 rotates so that the pigment box 51 faces the corresponding guide rail 6, and then the pigment The trolley 5 moves along the guide rail 6 to the lifting structure 3, so that the insertion rod 332 is inserted into the slot, and then the rotating motor 41 rotates, thereby driving the clamping plate 42 to rotate, so that the clamping plate 42 and the lifting frame 33 clamp the wing plate 522 in the middle, thereby limiting the paint trolley 5, and then the lifting motor 321 drives the threaded rod 32 to rotate, so that the lifting frame 33 drives the paint trolley 5 to move upward, and then the suction pipe of the second liquid pump 21 is inserted into the feeding port, and the suction pipe of the second liquid pump 21 draws the liquid in the paint box 51 into the paint box 2, thereby completing the addition of paint, making the addition of paint more convenient.

[0038] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present application.

Claims

1. A five-color offset printing machine, comprising five offset printing groups (1), characterized in that: A paint box (2) is arranged above each offset printing group (1), a paint cart (5) for adding paint into the paint box (51) is arranged next to the paint box (51), a lifting structure (3) for driving the paint cart (5) to rise and fall is arranged next to each offset printing group (1), a guide rail (6) is connected to the lower end of the lifting structure (3), the paint cart (5) can move along the guide rail (6), a paint bin (9) is arranged at the end of the guide rail (6) away from the lifting structure (3), a partition plate is arranged inside the paint bin (9) to divide the paint bin (9) into five parts, and a loading structure (8) for adding the paint in the paint bin (9) into the paint cart (5) is arranged above the paint bin (9).

2. A five-color offset printing machine according to claim 1, characterized in that: A turntable (7) is arranged between the guide rail (6) and the feeding structure (8), and the turntable (7) is connected to a motor for driving the turntable (7) to rotate. Five parking slots (71) are arranged at the edge of the upper surface of the turntable (7), and the five parking slots (71) are respectively opposite to the five guide rails (6), and the paint vehicle (5) can enter the parking slots (71) along the guide rails (6).

3. A five-color offset printing machine according to claim 2, characterized in that: The feeding structure (8) comprises a first liquid pump (81), a feeding pipe (82) and a discharging pipe (83); the first liquid pump (81) is located in the pigment bin (9); the feeding pipe (82) is connected to the liquid inlet of the first liquid pump (81), and the feeding pipe (82) is located in the pigment bin (9); the discharging pipe (83) is connected to the discharging port of the first liquid pump (81); an end of the discharging pipe (83) facing away from the first liquid pump (81) is located above the turntable (7); the pigment bin (9) is a cylinder, and the pigment bin (9) is connected to a bin rotating motor for driving the pigment bin (9) to rotate.

4. A five-color offset printing machine according to claim 3, characterized in that: The paint cart (5) comprises an electric motor plate (52) and a paint box (51); a feed port is provided above the paint box (51); slide grooves are provided on opposite sides of the feed port; a door panel (512) is slidably connected in the slide groove; the door panel (512) is connected to a toggle block (513); an elastic member is provided above the paint box (51); two ends of the elastic member are respectively connected to the paint box (51) and the toggle block (513); a discharge pipe (83) is a hard pipe; when the paint cart (5) is located on the turntable (7), the turntable (7) rotates to drive the paint cart (5) to move; and during the rotation process, the discharge pipe (83) contacts the toggle block (513), so that the discharge pipe (83) opens the door panel (512).

5. A five-color offset printing machine according to claim 4, characterized in that: The lifting structure (3) comprises a lifting bracket (31), a threaded rod (32) is rotatably connected inside the lifting bracket (31), and one end of the threaded rod (32) is fixedly connected to a lifting motor (321) for driving the threaded rod (32) to rotate, a lifting slot is provided on one side of the lifting bracket (31), a lifting frame (33) is slidably connected in the lifting slot, one end of the lifting frame (33) is connected to a threaded sleeve (331), the threaded sleeve (331) is threadedly connected to the threaded rod (32), and a clamping structure (4) for clamping a paint vehicle (5) is connected to one end of the lifting frame (33) away from the threaded sleeve (331).

6. A five-color offset printing machine according to claim 5, characterized in that: A plug rod (332) is provided on one side of the lifting frame (33) connected to the clamping structure (4), and a plug hole (521) is provided on one end of the electric vehicle board (52) close to the lifting frame (33). When the electric vehicle board (52) moves to the position of the lifting frame (33), the plug rod (332) is inserted into the plug hole (521).

7. A five-color offset printing machine according to claim 6, characterized in that: The clamping structure (4) comprises a rotating motor (41) fixedly connected to the lifting frame (33); the output shaft of the rotating motor (41) is fixedly connected to a clamping plate (42); a wing plate (522) is arranged on the surface of the electric vehicle board (52) on one side close to the lifting frame (33); when the electric vehicle board (52) contacts the lifting frame (33), the rotating motor (41) drives the clamping plate (42) to rotate, so that the clamping plate (42) and the lifting frame (33) clamp the wing plate (522) in between.

8. A five-color offset printing machine according to claim 7, characterized in that: The wing plate (522) is an inclined wing plate (522) at one end facing away from the lifting frame (33).

9. A five-color offset printing machine according to claim 7, characterized in that: A material taking port is provided above the paint box (51), and a material taking door (514) is hinged at the material taking port, and a torsion spring is connected to the hinge shaft of the material taking door (514). The paint box (2) is connected to a second liquid pump (21), and a material suction pipe of the second liquid pump (21) is located directly above the material taking port. When the paint box (2) reaches the highest point, the material suction pipe of the second liquid pump (21) pushes the material taking door (514) open.

10. The five-color offset printing machine according to claim 1, characterized in that: A cover plate (91) is hingedly connected above the pigment bin (9).

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