Small roll printing device

Abstract

The utility model relates to the technical field of roll printing devices, in particular to a small roll printing device which comprises a printing roller and a U-shaped support with a rightward opening, and the printing roller is rotatably mounted on the inner side of the right end of the U-shaped support. The printing device is reasonable and compact in structure and convenient to use, when the printing roller rotates forwards, stamp-pad ink in the ink box is evenly coated on a character die on the surface of the printing roller through the ink coating roller, then redundant stamp-pad ink on the surface of the printing roller and the character die is absorbed through the ink absorption roller, and therefore the printing efficiency is improved. Therefore, the stamp-pad ink adhered to the matrix pattern on the printing roller can be clearly printed on the printed surface without blooming, the influence on the quality of the printed matter due to excessive stamp-pad ink on the printing roller is avoided, and the printing roller has the characteristics of cleanness, labor saving, rapidness and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of roller printing devices and is a small roller printing device. Background Art

[0002] Printing is a technology that transfers printing ink (i.e., printing ink) to the surface of materials such as paper, textiles, plastics, leather, etc. through processes such as plate making, inking, and pressurization to copy the contents of the original manuscript in batches. In the prior art, for a small number of personalized printed products, it is impossible to use a production line to complete them due to the color matching of the design printing ink and other reasons. Workers usually use manually operated flat stamps and roller stamps (roller printers) for printing. The printing efficiency of flat stamps is low, and the quality of printed products is not high. The printing surface of the roller stamp is larger, so it has more space to set complex patterns. It realizes contact printing by pure rolling of the mold on the printing roller and the surface of the printed object. At the same time, it can also realize automatic inking of the mold on the printing roller through the ink wheel (roller), so it is used to mark characters or patterns on objects such as product outer packaging boxes and walls. However, in the process of inking the mold of the printing roller, the ink wheel is likely to cause too much printing oil on the printing surface of the printing roller, affecting the quality of the printed product. Summary of the invention

[0003] The utility model provides a small roller printing device, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the ink wheel of the existing roller printing device easily causes excessive printing oil on the printing surface of the printing roller during the process of inking the type mold, thereby affecting the quality of the printed product.

[0004] The technical scheme of the utility model is realized through the following measures: a small roller printing device comprises a printing roller and a U-shaped bracket opening to the right, the printing roller is rotatably mounted on the inner side of the right end of the U-shaped bracket; two lower support rods are arranged at intervals at the front and rear of the lower left side of the U-shaped bracket, an ink cartridge is fixedly mounted between the lower ends of the two lower support rods, an inking roller with its lower end located in the ink cartridge is rotatably mounted between the two lower support rods corresponding to the upper positions of the ink cartridge, the outer side of the right end of the inking roller contacts the outer side of the lower left part of the printing roller; two upper support rods are arranged at intervals at the front and rear of the upper left side of the U-shaped bracket, an oil suction roller is rotatably mounted between the two upper support rods, the outer side of the lower right part of the oil suction roller contacts the outer side of the upper left part of the printing roller.

[0005] The following are further optimizations and / or improvements to the above utility model technical solution:

[0006] The above-mentioned ink cartridge may include a box body, a baffle, a reinforcing rib plate, a front fixing part and a rear fixing part. A box body with an opening upward is provided between the lower parts of the two lower support rods. Baffles are detachably installed on the left and right upper ends of the box body. The gap between the two baffles is an ink dipping port, and the lower part of the inking roller is located in the ink dipping port. A reinforcing rib plate is provided between the middle part of the left side of the box body and the lower side of the left end of the U-shaped bracket. The front and rear sides of the box body are fixedly installed together with the corresponding lower support rods through the front fixing part and the rear fixing part respectively, and the front fixing part includes a fixing column and a fixing nut. A first notch opening downward and passing through the front and back is provided at the lower end of the support rod. A fixing rod is provided in the first notch. The rear end of the fixing rod is fixedly installed together with the middle part of the front side of the box body. A fixing nut whose rear end abuts against the front side of the corresponding lower support rod is screwed on the outer side of the front end of the fixing rod. The rear fixing part has the same structure as the front fixing part and is symmetrically arranged front and back.

[0007] The ink cartridge may further include an ink-dipping roller, which is rotatably mounted between the middle inner parts of the front side plate and the rear side plate of the cartridge body via a bearing seat, and the outer side of the upper end of the ink-dipping roller contacts the outer side of the lower part of the inking roller.

[0008] The front end and rear end of the printing roller can be rotatably installed together with the corresponding positions of the U-shaped bracket through the front rotating part and the rear rotating part respectively; the front rotating part includes a support shaft, a first bearing and a fastening nut, a first straight hole opening forward is provided in the middle of the front end of the printing roller, a second notch opening rightward and passing through the front and back is provided on the front side of the U-shaped bracket corresponding to the position of the first straight hole, a support shaft with a rear end located in the first straight hole is provided in the second notch, a first bearing is provided between the outer side of the rear end of the support shaft and the inner side of the first straight hole, and a fastening nut with the rear end abutting against the front side of the U-shaped bracket is screwed on the outer side of the front end of the support shaft; the rear rotating part has the same structure as the front rotating part and is symmetrically arranged front and back.

[0009] The front end and rear end of the inking roller can be rotatably installed together with the corresponding lower support rod through the first rotating part and the second rotating part respectively. The first rotating part may include a first fixed shaft, a second bearing and a lower locking nut. A second straight hole opening forward is provided in the middle of the front end of the inking roller. A third notch opening to the left and passing through front and back is provided on the lower support rod corresponding to the position in front of the second straight hole. The first fixed shaft with a rear end located in the second straight hole is provided in the third notch. A second bearing is provided between the outer side of the rear end of the first fixed shaft and the inner side of the second straight hole. A lower locking nut with a rear end abutting against the front side of the lower support rod is screwed on the outer side of the front end of the first fixed shaft. The second rotating part has the same structure as the first rotating part and is symmetrically arranged front to back.

[0010] The front end and rear end of the oil suction roller can be rotatably installed with the corresponding upper support rod through the third rotating part and the fourth rotating part respectively. The third rotating part may include a second fixed shaft, a third bearing and an upper locking nut. A third straight hole opening forward is provided in the middle of the front end of the oil suction roller. A fourth notch opening upward and penetrating front to back is provided on the upper support rod corresponding to the position in front of the third straight hole. A second fixed shaft with a rear end located in the third straight hole is provided in the fourth notch. A third bearing is provided between the outer side of the rear end of the second fixed shaft and the inner side of the third straight hole. An upper locking nut with a rear end abutting against the front side of the upper support rod is screwed on the outer side of the front end of the second fixed shaft. The fourth rotating part has the same structure as the third rotating part and is symmetrically arranged front to back.

[0011] The above may also include a rolling handle, and the rolling handle is fixedly installed on the left end of the U-shaped bracket.

[0012] The utility model has a reasonable and compact structure and is easy to use. When the printing roller rotates forward, the printing oil in the ink cartridge is evenly coated on the character mold on the surface of the printing roller by the ink coating roller, and then the excess printing oil on the surface of the printing roller and the character mold is absorbed by the oil absorption roller, so that the printing oil adhered to the character mold pattern on the printing roller can be printed on the printed surface clearly without smudge, so as to avoid affecting the quality of the printed product due to excessive printing oil on the printing roller. The utility model has the characteristics of being clean, labor-saving, fast and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 This is a schematic diagram of the main structure of Example 1 of the utility model.

[0014] Attached Figure 2 For attachment Figure 1 Schematic diagram of the three-dimensional structure.

[0015] Attached Figure 3 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the U-shaped bracket and the handle.

[0016] The codes in the accompanying drawings are: 1 is a printing roller, 2 is a U-shaped bracket, 3 is a lower support rod, 4 is an inking roller, 5 is an upper support rod, 6 is an oil absorption roller, 7 is a box body, 8 is a baffle, 9 is a reinforcing rib plate, 10 is an ink-dipping port, 11 is a fixing column, 12 is a fixing nut, 13 is a first notch, 14 is an inking roller, 15 is a supporting shaft, 16 is a first bearing, 17 is a fastening nut, 18 is a second notch, 19 is a first fixed shaft, 20 is a second bearing, 21 is a lower locking nut, 22 is a third notch, 23 is a second fixed shaft, 24 is a third bearing, 25 is an upper locking nut, 26 is a fourth notch, 27 is a rolling handle, and 28 is a mold. DETAILED DESCRIPTION

[0017] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0018] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0019] The present invention is further described below in conjunction with the embodiments and drawings:

[0020] Embodiment 1: As attached Figure 1-3 As shown, the small roller printing device includes a printing roller 1 and a U-shaped bracket 2 with an opening facing right, and the printing roller 1 is rotatably installed on the inner side of the right end of the U-shaped bracket 2; two lower support rods 3 are arranged at intervals on the front and back of the lower left side of the U-shaped bracket 2, and an ink cartridge is fixedly installed between the lower ends of the two lower support rods 3, and an inking roller 4 with the lower end located in the ink cartridge is rotatably installed between the two lower support rods 3 corresponding to the upper positions of the ink cartridge, and the outer side of the right end of the inking roller 4 contacts with the outer side of the lower left part of the printing roller 1; two upper support rods 5 are arranged at intervals on the front and back of the upper left side of the U-shaped bracket 2, and an oil suction roller 6 is rotatably installed between the two upper support rods 5, and the outer side of the lower right part of the oil suction roller 6 contacts with the outer side of the upper left part of the printing roller 1.

[0021] During use, the printing staff supports the left part of the U-shaped frame and pushes the printing roller 1 forward along the printed surface, so that the printing roller 1 can drive the inking roller 4 and the oil absorption roller 6 to rotate synchronously at the same time. The inking roller 4 can dip the printing ink from the ink cartridge during the rotation and evenly apply the printing oil to the type mold 28 on the surface of the printing roller 1, and the oil absorption roller 6 can automatically absorb the excess printing oil on the surface of the printing roller 1 and the type mold 28 during the rotation, so that the pattern of the type mold 28 on the printing roller 1 can be printed on the printed surface continuously, quickly, neatly, cleanly, clearly and without smudging.

[0022] According to the requirements, a character mold 28 is provided on the surface of the printing roller 1, and the shape of the character mold 28 is consistent with the characters or patterns to be rolled on the printed surface (on objects such as outer packaging or walls); the above-mentioned fixed installation can be achieved by the detachable installation method or non-detachable installation method commonly used in the prior art, and the rotating installation can be achieved by the bearing seat or rotating bearing in the prior art; the oil absorption roller 6 can be achieved by a sponge roller or a felt roller or a non-woven fabric roller or a brush roller in the prior art.

[0023] The above-mentioned small roller printing device can be further optimized and / or improved according to actual needs:

[0024] Embodiment 2: As attached Figure 1-3As shown, the ink cartridge includes a box body 7, a baffle 8, a reinforcing rib plate 9, a front fixing portion and a rear fixing portion. A box body 7 with an opening upward is provided between the lower portions of the two lower support rods 3. The baffle 8 can be detachably installed on the left and right upper ends of the box body 7. The gap between the two baffles 8 is an ink dipping port 10, and the lower portion of the inking roller 4 is located in the ink dipping port 10; a reinforcing rib plate 9 is provided between the middle portion of the left side of the box body 7 and the lower side of the left end of the U-shaped bracket 2; the front and rear sides of the box body 7 are fixedly installed together with the corresponding lower support rod 3 through the front fixing portion and the rear fixing portion respectively, and the front fixing portion includes a fixing column 11 and a fixing nut 12, and the lower end of the support rod is provided with a first notch 13 that opens downward and passes through front and back, and a fixing rod is provided in the first notch 13, and the rear end of the fixing rod is fixedly installed together with the middle portion of the front side of the box body 7, and the outer side of the front end of the fixing rod is screwed with a fixing nut 12 whose rear end abuts against the front side of the corresponding lower support rod 3, and the rear fixing portion has the same structure as the front fixing portion and is symmetrically arranged front and back.

[0025] By such an arrangement, without preventing the ink roller 4 from being stained with ink, the detachably installed baffle 8 changes the current situation of the ink cartridge being completely open, reduces the gap between the cartridge body 7 and the ink roller 4, and effectively prevents the printing oil in the cartridge body 7 from volatilizing and drying, so as to save printing oil. At the same time, it can also keep the printing oil in the best ratio at all times, greatly reduce the volatilization of volatile components in the printing oil, so as to improve the printing quality.

[0026] The reinforcing rib plate 9 together with the two lower support rods 3 can form a stable triangular support for the ink cartridge on the lower side of the U-shaped bracket 2, reduce the vibration of the ink cartridge, and effectively prevent the box body 7 from shaking or shifting; in addition, when the box body 7 and the reinforcing rib plate 9 are detachably installed, the ink cartridge can be quickly replaced and the color of the printing ink in the ink cartridge can be adjusted through the fixing nut 12 and the first notch 13.

[0027] During use, after loosening the fixing nut 12, the relative position between the ink cartridge and the ink-sucking roller 14 in the left-right direction can be quickly adjusted by moving the fixing rod left-right along the first notch 13, so that the ink-sucking roller 4 is aligned with the ink-sucking port 10.

[0028] Embodiment 3: As attached Figure 1-2 As shown, the ink cartridge also includes an ink-dipping roller 14, which is rotatably mounted between the middle inner part of the front side plate and the middle inner part of the rear side plate of the cartridge body 7 via a bearing seat, and the outer side of the upper end of the ink-dipping roller 14 contacts the outer side of the lower part of the inking roller 4.

[0029] During use, the inking roller 4 drives the ink-dipping roller 14 to rotate synchronously, so that the printing ink in the ink cartridge can be evenly applied to the inking roller 4. Especially when the amount of printing ink in the ink cartridge is small, the ink-dipping roller 14 can roll up the printing oil at the bottom of the ink cartridge and evenly transfer it to the inking roller 4, thereby avoiding repeated adding of printing oil during the printing process, greatly improving the efficiency of the printing operation; or when the printing volume is small, the amount of printing oil added to the ink cartridge can also be controlled to effectively prevent waste of printing oil.

[0030] Embodiment 4: As attached Figure 1-3 As shown, the front and rear ends of the printing roller 1 are rotatably mounted together with the corresponding positions of the U-shaped bracket 2 through the front rotating part and the rear rotating part respectively; the front rotating part includes a support shaft 15, a first bearing 16 and a fastening nut 17, a first straight hole opening forward is provided in the middle of the front end of the printing roller 1, a second notch 18 opening rightward and penetrating front and back is provided on the front side of the U-shaped bracket 2 corresponding to the position of the first straight hole, a support shaft 15 with a rear end located in the first straight hole is provided in the second notch 18, a first bearing 16 is provided between the outer side of the rear end of the support shaft 15 and the inner side of the first straight hole, and a fastening nut 17 with the rear end abutting against the front side of the U-shaped bracket 2 is screwed on the outer side of the front end of the support shaft 15; the rear rotating part has the same structure as the front rotating part and is symmetrically arranged front and back.

[0031] During use, after loosening the fastening nut 17, the relative position between the printing roller 1, the inking roller 4 and the oil-absorbing roller 6 can be quickly adjusted by moving the support shaft 15 left and right along the second notch 18, so as to prevent the character mold 28 on the printing roller 1 from adhering too much printing oil, so that the printing oil on the printing roller 1 can be just enough to clearly stamp the pattern of the character mold 28 on the printed surface without blurring, thereby ensuring good quality of the printed product. In addition, the printing roller 1 can be quickly disassembled and replaced by fastening the nut 17, the second notch 18 and the support shaft 1, so as to replace the printed pattern or maintain the printing roller 1.

[0032] Embodiment 5: As attached Figure 1-3 As shown, the front and rear ends of the ink coating roller 4 are rotatably installed with the corresponding lower support rod 3 through the first rotating part and the second rotating part respectively. The first rotating part includes a first fixed shaft 19, a second bearing 20 and a lower locking nut 21. A second straight hole opening forward is provided in the middle of the front end of the ink coating roller 4. A third notch 22 opening to the left and passing through front and back is provided on the lower support rod 3 corresponding to the position in front of the second straight hole. The first fixed shaft 19 with a rear end located in the second straight hole is provided in the third notch 22. A second bearing 20 is provided between the outer side of the rear end of the first fixed shaft 19 and the inner side of the second straight hole. The lower locking nut 21 with a rear end abutting against the front side of the lower support rod 3 is screwed on the outer side of the front end of the first fixed shaft 19. The second rotating part has the same structure as the first rotating part and is symmetrically arranged front and back.

[0033] During use, the first fixed shaft 19, the third notch 22 and the lower locking nut 21 can be used to quickly disassemble, replace or maintain the inking roller 4. It can also be used to adjust the relative position between the inking roller 4 and the printing roller 1, so as to control the amount of printing ink applied on the printing roller 1 to save printing ink and save costs.

[0034] Embodiment 6: As attached Figure 1-3As shown, the front and rear ends of the oil suction roller 6 are rotatably installed with the corresponding upper support rod 5 through the third rotating part and the fourth rotating part respectively. The third rotating part includes a second fixed shaft 23, a third bearing 24 and an upper locking nut 25. A third straight hole opening forward is provided in the middle of the front end of the oil suction roller 6. A fourth notch 26 opening upward and passing through front and back is provided on the upper support rod 5 corresponding to the front position of the third straight hole. The second fixed shaft 23 with a rear end located in the third straight hole is provided in the fourth notch 26. A third bearing 24 is provided between the outer side of the rear end of the second fixed shaft 23 and the inner side of the third straight hole. The upper locking nut 25 with a rear end abutting against the front side of the upper support rod 5 is screwed on the outer side of the front end of the second fixed shaft 23. The fourth rotating part has the same structure as the third rotating part and is symmetrically arranged front and back.

[0035] During use, the oil absorption roller 6 can be quickly disassembled, replaced or maintained through the second fixed shaft 23, the fourth notch 26 and the upper locking nut 25. It can also be used to adjust the relative position between the oil absorption roller 6 and the printing roller 1, so as to control the amount of printing oil applied to the mold 28 on the printing roller 1, so that the amount of printing oil on the mold 28 of the printing roller 1 can be just enough to print the pattern clearly without smudging and diffusing outwards, thereby accelerating the drying of the printed pattern and effectively improving the quality of the printed product.

[0036] Embodiment 7: As attached Figure 1-3 As shown, it also includes a rolling handle 27, and the left end of the U-shaped bracket 2 is fixedly mounted with the rolling handle 27.

[0037] By such arrangement, after holding the printing roller handle 27, it is easier to control the U-shaped bracket 2 to move forward, which can greatly improve the printing roller work efficiency, reduce the operation difficulty, and save operation time.

[0038] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A small roller printing device, characterized in that It includes a printing roller and a U-shaped bracket opening to the right, wherein the printing roller is rotatably installed on the inner side of the right end of the U-shaped bracket; two lower support rods are arranged at intervals on the front and rear sides of the lower left side of the U-shaped bracket, an ink cartridge is fixedly installed between the lower ends of the two lower support rods, an inking roller with its lower end located in the ink cartridge is rotatably installed between the two lower support rods corresponding to the upper positions of the ink cartridge, and the outer side of the right end of the inking roller contacts the outer side of the lower left part of the printing roller; two upper support rods are arranged at intervals on the front and rear sides of the upper left side of the U-shaped bracket, an oil suction roller is rotatably installed between the two upper support rods, and the outer side of the lower right part of the oil suction roller contacts the outer side of the upper left part of the printing roller.

2. The small roller printing device according to claim 1, characterized in that The ink cartridge comprises a box body, a baffle, a reinforcing rib plate, a front fixing part and a rear fixing part, a box body with an opening upward is provided between the lower parts of the two lower support rods, and baffles are detachably installed on the left and right upper ends of the box body, the gap between the two baffles is an ink dipping port, and the lower part of the inking roller is located in the ink dipping port; a reinforcing rib plate is provided between the middle part of the left side of the box body and the lower side of the left end of the U-shaped bracket; the front and rear sides of the box body are fixedly installed together with the corresponding lower support rods through the front fixing part and the rear fixing part respectively, the front fixing part comprises a fixing column and a fixing nut, a first notch opening downward and passing through the front and back is provided at the lower end of the support rod, a fixing rod is provided in the first notch, the rear end of the fixing rod is fixedly installed together with the middle part of the front side of the box body, a fixing nut whose rear end abuts against the front side of the corresponding lower support rod is screwed on the outer side of the front end of the fixing rod, and the rear fixing part has the same structure as the front fixing part and is symmetrically arranged front and back.

3. The small roller printing device according to claim 2, characterized in that The ink cartridge also includes an ink-dipping roller, which is rotatably mounted between the middle inner parts of the front side plate and the rear side plate of the cartridge body via a bearing seat, and the outer side of the upper end of the ink-dipping roller contacts the outer side of the lower part of the inking roller.

4. The small roller printing device according to claim 1, 2 or 3, characterized in that The front end and rear end of the printing roller are rotatably installed with the corresponding positions of the U-shaped bracket through the front rotating part and the rear rotating part respectively; the front rotating part includes a support shaft, a first bearing and a fastening nut, a first straight hole is provided in the middle of the front end of the printing roller, and a second notch is provided on the front side of the U-shaped bracket corresponding to the position of the first straight hole, and the rear end of the support shaft is located in the first straight hole. The first bearing is provided between the outer side of the rear end of the support shaft and the inner side of the first straight hole, and the fastening nut of the rear end abutting against the front side of the U-shaped bracket is screwed on the outer side of the front end of the support shaft; the rear rotating part has the same structure as the front rotating part and is symmetrically arranged front and back.

5. The small roller printing device according to claim 1, 2 or 3, characterized in that The front end and rear end of the inking roller are rotatably installed with the corresponding lower support rod through the first rotating part and the second rotating part respectively, the first rotating part includes a first fixed shaft, a second bearing and a lower locking nut, a second straight hole is provided in the middle of the front end of the inking roller, and a third notch is provided on the lower support rod corresponding to the position in front of the second straight hole, the third notch has a rear end located in the second straight hole, a second bearing is provided between the outer side of the rear end of the first fixed shaft and the inner side of the second straight hole, a lower locking nut is screwed on the outer side of the front end of the first fixed shaft, and the rear end is abutted against the front side of the lower support rod, and the second rotating part has the same structure as the first rotating part and is symmetrically arranged front to back.

6. The small roller printing device according to claim 4, characterized in that The front end and rear end of the inking roller are rotatably installed with the corresponding lower support rod through the first rotating part and the second rotating part respectively, the first rotating part includes a first fixed shaft, a second bearing and a lower locking nut, a second straight hole is provided in the middle of the front end of the inking roller, and a third notch is provided on the lower support rod corresponding to the position in front of the second straight hole, the third notch has a rear end located in the second straight hole, a second bearing is provided between the outer side of the rear end of the first fixed shaft and the inner side of the second straight hole, a lower locking nut is screwed on the outer side of the front end of the first fixed shaft, and the rear end is abutted against the front side of the lower support rod, and the second rotating part has the same structure as the first rotating part and is symmetrically arranged front to back.

7. The small roller printing device according to claim 1, 2, 3 or 6, characterized in that The front end and rear end of the oil suction roller are rotatably installed with the corresponding upper support rod through the third rotating part and the fourth rotating part respectively. The third rotating part includes a second fixed shaft, a third bearing and an upper locking nut. A third straight hole opening forward is provided in the middle of the front end of the oil suction roller. A fourth notch opening upward and penetrating front to back is provided on the upper support rod corresponding to the position in front of the third straight hole. A second fixed shaft with a rear end located in the third straight hole is provided in the fourth notch. A third bearing is provided between the outer side of the rear end of the second fixed shaft and the inner side of the third straight hole. An upper locking nut with a rear end abutting against the front side of the upper support rod is screwed on the outer side of the front end of the second fixed shaft. The fourth rotating part has the same structure as the third rotating part and is symmetrically arranged front to back.

8. The small roller printing device according to claim 4, characterized in that The front end and rear end of the oil suction roller are rotatably installed with the corresponding upper support rod through the third rotating part and the fourth rotating part respectively. The third rotating part includes a second fixed shaft, a third bearing and an upper locking nut. A third straight hole opening forward is provided in the middle of the front end of the oil suction roller. A fourth notch opening upward and penetrating front to back is provided on the upper support rod corresponding to the position in front of the third straight hole. A second fixed shaft with a rear end located in the third straight hole is provided in the fourth notch. A third bearing is provided between the outer side of the rear end of the second fixed shaft and the inner side of the third straight hole. An upper locking nut with a rear end abutting against the front side of the upper support rod is screwed on the outer side of the front end of the second fixed shaft. The fourth rotating part has the same structure as the third rotating part and is symmetrically arranged front to back.

9. The small roller printing device according to claim 5, characterized in that The front end and rear end of the oil suction roller are rotatably installed with the corresponding upper support rod through the third rotating part and the fourth rotating part respectively. The third rotating part includes a second fixed shaft, a third bearing and an upper locking nut. A third straight hole opening forward is provided in the middle of the front end of the oil suction roller. A fourth notch opening upward and penetrating front to back is provided on the upper support rod corresponding to the position in front of the third straight hole. A second fixed shaft with a rear end located in the third straight hole is provided in the fourth notch. A third bearing is provided between the outer side of the rear end of the second fixed shaft and the inner side of the third straight hole. An upper locking nut with a rear end abutting against the front side of the upper support rod is screwed on the outer side of the front end of the second fixed shaft. The fourth rotating part has the same structure as the third rotating part and is symmetrically arranged front to back.

10. The small roller printing device according to claim 1 or 2 or 3 or 6 or 8 or 9, characterized in that It also includes a rolling print handle, and the left end of the U-shaped bracket is fixedly installed with the rolling print handle.

Images