Letterpress printing mechanism of trademark rotary press capable of automatically inking

Abstract

The utility model relates to the technical field of rotary press equipment, in particular to an automatic inking letterpress printing mechanism of a trademark rotary press, which is characterized in that an inking unit is fixedly arranged on a rack, an inking roller is rotatably arranged on the inking unit through a bearing, an ink supply roller is arranged on the side of the inking unit and is rotatably arranged on the rack through a bearing, and the inking roller is arranged on the rack through a bearing. The two ink guide ducts are vertically arranged and fixed to the wall of the side, facing the ink supply roller, of the ink coating unit in a penetrating mode, the main ink transfer roller is movably arranged in one ink guide duct, the two supporting shafts are fixedly arranged on the rack in a front-back symmetry mode, and the two main supporting arms form a set and are rotationally arranged on shafts at the two ends of the main ink transfer roller through bearings correspondingly. The other end of the main supporting arm is rotationally arranged on the supporting shaft through a bearing; according to the ink supply device, the double-ink-transfer-roller structure is arranged, the two sets of ink transfer rollers are alternately pushed through the gear-adjustable driving structure to make contact with the ink supply roller, continuous ink supply to the inking structure is achieved, and therefore the problem of ink shortage is effectively solved.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary printing press equipment, specifically to a letterpress printing mechanism for a trademark rotary printing press with automatic inking capability. Background Technology

[0002] Rotary printing presses efficiently and quickly transfer ink to the printing medium through the rotation of the printing cylinder and its coordinated movement with the printing medium. Their high efficiency, speed, and precision make them commonly used for mass production of packaging and brochures. Currently, a type of letterpress rotary printing press, due to its mature and time-tested structure, is used in the low-profit, high-volume printing industry. One of the core components of a rotary printing press is its ink supply unit. Through the cooperation of multiple rollers, as well as the distribution roller and the transfer roller, it evenly transfers ink from the ink fountain to the letterpress cylinder in contact with the printing medium. However, this unit typically only has a single set of transfer rollers to transfer ink between the ink fountain and the distribution roller. The ink transfer is achieved through intermittent contact between the transfer roller and the ink supply roller, which can easily lead to ink interruptions when the machine's flow rate is not precisely adjusted. Therefore, this part of the structure needs improvement and optimization. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing an automatic ink supply mechanism for a rotary label printing machine. This mechanism utilizes a dual ink transfer roller structure and an adjustable drive structure to alternately push the two sets of ink transfer rollers to contact the ink supply rollers, thereby achieving continuous ink supply to the ink supply structure and effectively solving the problem of ink interruption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] It comprises a frame, an inking unit, an inking roller, and an inking supply roller. The inking unit is fixedly mounted on the frame, the inking roller is screwed onto the inking unit via bearings, and the inking supply roller is located to the side of the inking unit and screwed onto the frame via bearings. It also includes: two guide hoppers arranged vertically and fixedly mounted on the wall of the inking unit facing the inking supply roller; a main transfer roller movably mounted within one of the guide hoppers; two support shafts symmetrically fixed to the frame; two main support arms, each set of two and screwed onto the two ends of the main transfer roller via bearings, with the other end of each main support arm screwed onto a support shaft via bearings; and a stepper motor fixedly mounted on the frame and cooperating with the main support arms.

[0006] Preferably, a secondary ink transfer roller is provided on the side of the main ink transfer roller, and the secondary ink transfer roller is movably disposed in another ink guide hopper. Both ends of the secondary ink transfer roller are provided with secondary support arms through bearings, and the other end of the secondary support arm is provided with a support shaft through a bearing. The secondary support arm is disposed on the side of the main support arm.

[0007] Preferably, the frame is provided with two reset elastic plates on the wall located on the side of the support shaft, with one reset elastic plate in one group abutting against the main support arm and the other reset elastic plate in the other group abutting against the auxiliary support arm.

[0008] Preferably, a mounting bracket is fixedly installed on the output shaft of the stepper motor, and crankshafts are screwed onto both the front and rear ends of the mounting bracket. The two crankshafts are respectively located on the sides of the front and rear support shafts. A transmission arm is fixedly installed on the handle end of the crankshaft, and a transmission pin is fixedly installed on the transmission arm.

[0009] Preferably, a spline sleeve is screwed onto the mounting bracket via a bearing, a spline shaft is integrally formed on the crankshaft end, the spline shaft is movably inserted into the spline sleeve, a spring is sleeved on the spline shaft, one end of the spring is fixedly mounted on the spline sleeve, and the other end of the spring is fixedly mounted on the crankshaft, a drive motor is fixedly mounted on the mounting bracket, and the output shaft of the drive motor is connected to the spline sleeve via a spur gear set.

[0010] Preferably, a positioning pin is fixedly provided on the crankshaft shank end, and positioning holes are symmetrically opened on both sides of the spline sleeve on the mounting bracket, with the positioning pin cooperating with one of the positioning holes in a set.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This solution uses alternating main and auxiliary ink transfer rollers to deliver ink from the ink supply roller to the inking unit, ensuring continuous and uninterrupted ink application to the ink roller, thus guaranteeing printing quality and ensuring uninterrupted ink supply.

[0013] 2. This solution uses a switchable transmission pin to drive the main support arm or the auxiliary support arm to rotate. A set of stepper motors allows for switching and adjustment, driving the main or auxiliary ink transfer roller to contact the ink supply roller and transfer ink. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 yes Figure 1 The right-side view.

[0016] Figure 3This is a schematic diagram of the frame structure in this utility model.

[0017] Figure 4 This is a structural schematic diagram of the mounting bracket, spline sleeve, and crankshaft in this utility model.

[0018] Figure 5 yes Figure 4 The bottom side view.

[0019] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Inking unit; 3. Ink roller; 4. Ink supply roller; 5. Ink guide hopper; 6. Main ink transfer roller; 7. Support shaft; 8. Main support arm; 9. Stepper motor; 10. Secondary ink transfer roller; 11. Secondary support arm; 12. Reset elastic plate; 13. Mounting bracket; 14. Crankshaft; 15. Transmission arm; 16. Transmission pin; 17. Spline sleeve; 18. Spline shaft; 19. Drive motor; 20. Spring; 21. Positioning pin; 22. Positioning hole. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] like Figure 1-5 As shown, the specific implementation adopts the following technical solution:

[0022] This specific embodiment includes a frame 1, an inking unit 2, an inking roller 3, and an inking supply roller 4. The inking unit 2 is fixedly mounted on the frame 1. The inking roller 3 is screwed into the left port of the inking unit 2 via bearings. The inking roller 4 is located on the right side of the inking unit 2 and is screwed onto the frame 1 via bearings. Two ink guide hoppers 5 are arranged vertically on the right side wall of the inking unit 2. The upper ink guide hopper 5 houses the main ink transfer roller 6, and the lower ink guide hopper 5 houses the auxiliary ink transfer roller 10. The main ink transfer roller 6... Main support arms 8 are screwed onto the shafts at both ends via bearings. Secondary support arms 11 are screwed onto the shafts at both ends of the auxiliary ink transfer roller 10 via bearings. Support shafts 7 are fixedly installed on both the front and rear sides of the frame 1. The main support arms 8 and secondary support arms 11 on the front and rear sides are respectively screwed onto the support shafts 7 on the front and rear sides via bearings, with the secondary support arms 11 located inside the main support arms 8. A stepper motor rod 9 is fixedly installed on the frame 1. A mounting bracket 13 is fixedly installed on the output shaft of the stepper motor rod 9. The front and rear ends of the mounting bracket 13 are... A spline sleeve 17 is symmetrically screwed onto a bearing. A spline shaft 18 is movably inserted into the spline sleeve 17. A crankshaft 14 is fixedly mounted on the spline shaft 18. A drive motor 19 is fixedly mounted on a mounting bracket 13. The output shaft of the drive motor 19 is connected to the spline sleeve 17 via a spur gear set. A spring 20 is sleeved on the spline shaft 18, with one end of the spring 20 fixedly mounted on the spline sleeve 17 and the other end fixedly mounted on the crankshaft 14. A transmission arm 15 is fixedly mounted on the crankshaft 14. A transmission pin 16 is fixedly installed on the crankshaft 14, which is configured to cooperate with one of the main support arms 8 and the auxiliary support arms 11. A positioning pin 21 is coaxially installed on the crankshaft 14 and the transmission arm 15. A set of two positioning holes 22 are symmetrically opened on both sides of the spline sleeve 17 on the mounting bracket 13, and the positioning pin 21 is configured to cooperate with one of the positioning holes 22. Two reset elastic plates 12 are fixedly installed on the frame 1, and the two reset elastic plates 12 abut against the main support arm 8 and the auxiliary support arm 11 respectively.

[0023] When using this device, the ink supply roller 4 is engaged with the ink fountain, and an external power device drives the ink supply roller 4 to rotate, drawing ink from the ink fountain and adhering it to the surface of the ink supply roller 4. The ink then alternately contacts the main ink transfer roller 6 and the auxiliary ink transfer roller 10, transferring the ink from the ink supply roller 4 to the main ink transfer roller 6 or the auxiliary ink transfer roller 10. This ink is then fed into the inking unit 2 and evenly coated onto the inking roller 3, thereby applying ink to the printing cylinder via the inking roller 3. The main ink transfer roller 6 or the auxiliary ink transfer roller 10 is then pushed away from the ink fountain 5 and into contact with the ink supply roller 4. Upon contact, the drive motor 19 first rotates the spline sleeve 17, which in turn rotates the crankshaft 14 via the spline shaft 18. The crankshaft 14 then rotates the transmission arm 15, aligning the transmission pin 16 with either the main support arm 8 or the secondary support arm 11. The stepper motor 9 then moves the mounting bracket to the right, causing the mounting bracket 13 to move the spline sleeve 17. The spline sleeve 17, supported by the spring 20, propels the crankshaft 14 to the right. The transmission pin 16 then abuts against the corresponding main support arm 8 or secondary support arm 11, pushing it to rotate. The corresponding main ink transfer roller 6 or auxiliary ink transfer roller 10 is disengaged from the ink guide hopper 5 and rotates with the ink supply roller 4. The rotation of the ink supply roller 4 creates a shearing action between itself and the main ink transfer roller 6 or auxiliary ink transfer roller 10 to achieve ink loading. After the drive pin 16 pushes the main ink transfer roller 6 or auxiliary ink transfer roller 10 against the ink supply roller 4, as the mounting bracket 13 continues to move to the right, the spline shaft 18 slides into the spline sleeve 17 and presses the spring 20. After the ink loading of the ink supply roller 4 is completed, the mounting bracket 13 moves to the left to reset, and the reset elastic plate 12 pushes the corresponding main support arm. 8 or the auxiliary support arm 11 is reset, and the main ink transfer roller 6 or the auxiliary ink transfer roller 10, which has completed the ink application, is reset to the ink guide 5. The spline sleeve 17 is driven to reciprocate through the drive motor 19, so that the transmission pin 16 can reciprocate between the main support arm 8 and the auxiliary support arm 11. That is, the ink on the ink supply roller 4 is alternately sent into the ink coating unit 2 through the main ink transfer roller 6 and the auxiliary ink transfer roller 10. When the crankshaft 14 has completed its rotation and the spring 20 is compressed, the positioning pin 21 is inserted into the positioning hole 22 to prevent the crankshaft 14 from rotating, thereby preventing the transmission pin 16 from dislodging.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] 1. This solution sets two sets of main ink transfer rollers 6 and auxiliary ink transfer rollers 10 between the ink coating unit 2 and the ink supply roller 4, so that the ink is transferred alternately through the main ink transfer rollers 6 and auxiliary ink transfer rollers 10, thereby achieving uninterrupted ink supply to the ink coating unit 2 and maintaining continuous ink application on the ink roller 3.

[0026] 2. This solution uses a reciprocating mounting bracket 13, in conjunction with a reciprocating and alternating rotating transmission pin 16, to drive the main support arm 8 or the auxiliary support arm 11 to rotate, thereby driving the main ink transfer roller 6 or the auxiliary ink transfer roller 10 to cooperate with the ink supply roller 4 to transfer ink.

[0027] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A letterpress printing mechanism for a rotary label printing machine capable of automatic inking, comprising a frame (1), an inking unit (2), an inking roller (3), and an inking roller (4), wherein the inking unit (2) is fixedly mounted on the frame (1), the inking roller (3) is spun onto the inking unit (2) via bearings, and the inking roller (4) is disposed on the side of the inking unit (2) and is spun onto the frame (1) via bearings; characterized in that, It also includes: two ink guides (5), which are arranged vertically and fixed on the wall of the ink coating unit (2) facing the ink supply roller (4); a main ink transfer roller (6), which is movably disposed in one of the ink guides (5); a support shaft (7), which is two and fixedly disposed on the frame (1) in a symmetrical manner; a main support arm (8), which is two in a group and respectively screwed onto the two ends of the main ink transfer roller (6) by bearings, and the other end of the main support arm (8) is screwed onto the support shaft (7) by bearings; and a stepper motor (9), which is fixedly disposed on the frame (1) and is configured to cooperate with the main support arm (8).

2. The letterpress printing mechanism of a rotary label printing press with automatic inking capability according to claim 1, characterized in that: A secondary ink transfer roller (10) is provided on the side of the main ink transfer roller (6), and the secondary ink transfer roller (10) is movably disposed in another ink guide hopper (5). A secondary support arm (11) is screwed on both ends of the secondary ink transfer roller (10) through bearings, and the other end of the secondary support arm (11) is screwed on the support shaft (7) through bearings. The secondary support arm (11) is disposed on the side of the main support arm (8).

3. The letterpress printing mechanism of a rotary label printing press with automatic inking capability according to claim 2, characterized in that: On the frame (1), on the wall located on the side of the support shaft (7), there are two reset elastic plates (12) arranged in groups of two. One of the reset elastic plates (12) in one group abuts against the main support arm (8), and the other reset elastic plate (12) in the other group abuts against the auxiliary support arm (11).

4. The letterpress printing mechanism of a rotary label printing press with automatic inking capability according to claim 3, characterized in that: A mounting bracket (13) is fixedly installed on the output shaft of the stepper electric rod (9). A crankshaft (14) is screwed onto both the front and rear ends of the mounting bracket (13). The two crankshafts (14) are respectively located on the sides of the two support shafts (7). A transmission arm (15) is fixedly installed on the handle end of the crankshaft (14). A transmission pin (16) is fixedly installed on the transmission arm (15).

5. The letterpress printing mechanism of a rotary label printing press with automatic inking capability according to claim 4, characterized in that: The mounting bracket (13) is screwed with a spline sleeve (17) via a bearing. A spline shaft (18) is integrally formed on the shaft end of the crankshaft (14). The spline shaft (18) is movably inserted into the spline sleeve (17). A spring (20) is sleeved on the spline shaft (18). One end of the spring (20) is fixedly mounted on the spline sleeve (17), and the other end of the spring (20) is fixedly mounted on the crankshaft (14). A drive motor (19) is fixedly mounted on the mounting bracket (13). The output shaft of the drive motor (19) is connected to the spline sleeve (17) via a spur gear set.

6. The letterpress printing mechanism of a rotary label printing press with automatic inking capability according to claim 5, characterized in that: A positioning pin (21) is fixedly provided on the handle end of the crankshaft (14), and positioning holes (22) are symmetrically opened on both sides of the spline sleeve (17) on the mounting bracket (13). The positioning pin (21) is matched with one of the positioning holes (22) in a set.

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