Positioning mechanism for roll paper printing

Abstract

The utility model discloses a positioning mechanism for roll paper printing. The problems that an existing roll paper printing positioning device is high in cost and poor in fixing effect are effectively solved. Comprising a mandrel barrel in the left-right axial direction, a plurality of containing grooves evenly distributed in the circumferential direction of the mandrel barrel are formed in the mandrel barrel, a plurality of sets of telescopic columns evenly distributed in the left-right direction are arranged in the mandrel barrel, each set of telescopic columns are evenly distributed in the circumferential direction and correspond to the containing grooves in a one-to-one mode, and the outer ends of the telescopic columns are slidably connected with the mandrel barrel and provided with arc-shaped expanding and supporting plates. A sliding block which is located between the telescopic columns and can move left and right is coaxially arranged in the mandrel barrel, and a plurality of ejector blocks which correspond to the telescopic columns one to one and can make contact with the telescopic columns are arranged on the sliding block. The device is simple in structure, novel in conception, convenient to use and high in practicability.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, and in particular to a positioning mechanism for roll paper printing. Background Technology

[0002] Roll paper is a type of paper used in rotary printing. Its width is generally fixed, and its length can reach several kilometers. It can be continuously transported during printing and is mainly suitable for printing newspapers, supermarket promotional posters, and other printed materials with large print runs. During the unwinding process of printing roll paper, different mandrels are used to position the roll paper according to the different sizes of the roll paper core required by the machine. Most of the existing positioning mandrels are air expansion shafts. Air expansion shafts (also known as air shafts, air pressure shafts, expansion shafts, etc.) are a special type of winding and unwinding shaft. High-pressure air is used to make the surface protrude (such as key strips or plates), and after deflating, it quickly retracts. The protruding key strips or plates can achieve the positioning of roll paper with different inner diameters.

[0003] However, this traditional air shaft positioning mechanism has the following drawbacks: 1. The air shaft requires a complete set of supporting power systems, such as high-pressure air pumps and high-pressure valves, which are costly and have many electronic components, making them prone to failure. 2. Since high-pressure gas is used as the driving source, after a period of use, wear and tear between parts may cause poor air tightness, resulting in poor fixing effect. Utility Model Content

[0004] In view of the above situation and in order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a positioning mechanism for roll paper printing, which effectively solves the problems of high cost and poor fixing effect of existing roll paper printing positioning devices.

[0005] The technical solution is as follows: This utility model includes a mandrel cylinder with a left-right axis. The mandrel cylinder has multiple receiving grooves evenly distributed along its circumference. The mandrel cylinder has multiple sets of telescopic columns evenly distributed along the left-right direction. Each set of telescopic columns is evenly distributed along the circumference and corresponds to one of the receiving grooves. The outer end of the telescopic column is slidably connected to the mandrel cylinder and is provided with an arc-shaped expansion plate. The mandrel cylinder has a slider located between the multiple telescopic columns and can move left and right. The slider is provided with multiple top blocks that correspond to one of the telescopic columns and can contact the telescopic columns.

[0006] Preferably, the left end face of the top block is an inclined surface that gradually rises from left to right.

[0007] Preferably, the mandrel cylinder is provided with a plurality of sliding columns that are slidably connected to the slider.

[0008] Preferably, the mandrel cylinder is coaxially rotatably connected to a stud that is threadedly connected to the slider.

[0009] Preferably, the right end of the stud passes through the mandrel cylinder and is coaxially provided with a turntable.

[0010] Preferably, the expansion plate has reset posts penetrating the mandrel cylinder on both the left and right sides, and a reset plate is provided at the free end of the reset post. A spring is fitted on the reset post between the reset plate and the mandrel cylinder.

[0011] Preferably, the outer surface of the expansion plate is provided with an anti-slip layer.

[0012] Compared with the prior art, the beneficial effects of this utility model are: it can achieve fixed positioning of rolls of paper of different sizes. Compared with the traditional air shaft positioning, it does not require an additional power source and adopts a mechanical structure to achieve positioning, thereby reducing the failure rate and avoiding the problem of poor air tightness caused by long-term wear. Attached Figure Description

[0013] Figure 1 This is the main view axonometric drawing of this utility model.

[0014] Figure 2 This is a full-section main view axonometric drawing of this utility model.

[0015] Figure 3 This is a full-section right-view axonometric drawing of this utility model.

[0016] Figure 4 This is a full-section right-view axonometric drawing of this utility model.

[0017] Figure 5 This is a full-section top-view axonometric drawing of this utility model.

[0018] Figure 6 This is a utility model Figure 2 A magnified view of A in the middle.

[0019] Figure label:

[0020] 1. Mandrel cylinder; 2. Receiving groove; 3. Telescopic column; 4. Expansion plate; 5. Sliding block; 6. Top block; 7. Sliding column; 8. Stud; 9. Turntable; 10. Reset column; 11. Reset plate; 12. Spring. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the implementations of the base model disclosed below.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Depend on Figures 1 to 6 The device includes a mandrel cylinder 1 with a left-right axis, multiple receiving grooves 2 evenly distributed along its circumference on the mandrel cylinder 1, multiple sets of telescopic columns 3 evenly distributed along the left-right direction inside the mandrel cylinder 1, each set of telescopic columns 3 being evenly distributed along the circumference and corresponding one-to-one with the receiving grooves 2, the outer end of the telescopic column 3 being slidably connected to the mandrel cylinder 1 and having an arc-shaped expansion plate 4, and a slider 5 coaxially arranged inside the mandrel cylinder 1 between the multiple telescopic columns 3 and capable of moving left and right, the slider 5 having multiple top blocks 6 corresponding one-to-one with the telescopic columns 3 and capable of contacting the telescopic columns 3.

[0025] For ease of use, the left end face of the top block 6 is an inclined surface that gradually rises from left to right.

[0026] To facilitate the movement of the slider 5, the mandrel cylinder 1 is provided with a plurality of sliding columns 7 that are slidably connected to the slider 5.

[0027] In order to move the slider 5, a stud 8 is coaxially rotatably connected to the slider 5 inside the spindle cylinder 1.

[0028] To facilitate the rotation of the stud 8, the right end of the stud 8 passes through the mandrel cylinder 1 and is coaxially provided with a turntable 9.

[0029] To facilitate the repositioning of the expansion plate 4, the expansion plate 4 is provided with a repositioning post 10 that passes through the mandrel cylinder 1 on both the left and right sides. The free end of the repositioning post 10 is provided with a repositioning plate 11, and a spring 12 is fitted on the repositioning post 10 between the repositioning plate 11 and the mandrel cylinder 1.

[0030] For ease of use, the outer surface of the expansion plate 4 is provided with an anti-slip layer.

[0031] In use, the roll of paper to be printed is first placed on the mandrel cylinder 1. Then, the operator rotates the turntable 9, which drives the stud 8 to rotate clockwise. The stud 8 drives the slider 5 to move to the left on the sliding column 7. The sliding column 7 drives the multiple top blocks 6 on it to move to the left. Since the left end face of the top block 6 is inclined, after moving to the left a certain distance, the inclined surface of the top block 6 contacts the telescopic column 3 and pushes the telescopic column 3 outward, causing the telescopic column 3 to move. The telescopic column 3 drives the expansion plate 4 on it to move outward. After moving outward a certain distance, the expansion plate 4 extends out of the receiving groove 2, and its outer surface contacts the inner surface of the roll of paper and achieves automatic positioning. This makes the roll of paper coaxial with the mandrel cylinder 1 and simultaneously achieves the compression, fixing and limiting of the mandrel cylinder 1. At the same time, the anti-slip layer prevents slippage.

[0032] After positioning is complete, the printing press can be started. The rotation of the mandrel cylinder 1 ensures a continuous supply of paper for printing, facilitating continuous printing. Due to the self-locking property of the stud 8, the slider 5 will not move when the stud 8 is not rotated, thus achieving continuous compression between the top block 6 and the telescopic column 3, preventing positioning failure during printing. When the paper roll needs to be replaced after use, the stud 8 is rotated in the reverse direction. The stud 8 drives the slider 5 to move to the right, and the slider 5 drives the top block 6 to move to the right. At this time, due to the loss of compression from the top block 6 and the restoring force of the spring 12, the reset column 10 drives the expansion plate 4 to move inward. After moving inward a certain distance, the multiple expansion plates 4 retract into the receiving groove 2, and the expansion plates 4 disengage from the inner surface of the paper roll, thereby releasing the positioning of the paper roll. The paper roll tube is then removed, and a new paper roll is replaced. The above operation is repeated to reposition the paper roll.

[0033] Compared with the prior art, the beneficial effects of this utility model are: the mandrel cylinder, expansion plate, stud, etc. provided can realize the fixed positioning of rolls of paper of different sizes. Compared with the traditional air shaft positioning, no additional power source is required. The positioning is achieved by mechanical structure, thereby reducing the failure rate. At the same time, it avoids the problem of poor air tightness caused by long-term wear. This structure is simple, novel in concept, convenient to use, and highly practical.

[0034] It should be noted that, depending on the implementation needs, the various components described in the embodiments of this utility model can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of this utility model.

[0035] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A positioning mechanism for roll paper printing, comprising a mandrel cylinder (1) with left and right axial directions, characterized in that, The mandrel cylinder (1) has multiple receiving grooves (2) evenly distributed along its circumference. The mandrel cylinder (1) has multiple sets of telescopic columns (3) evenly distributed along the left and right directions. Each set of telescopic columns (3) is evenly distributed along the circumference and corresponds to the receiving groove (2) one by one. The outer end of the telescopic column (3) is slidably connected to the mandrel cylinder (1) and is provided with an arc-shaped expansion plate (4). The mandrel cylinder (1) is coaxially provided with a slider (5) located between multiple telescopic columns (3) and can move left and right. The slider (5) is provided with multiple top blocks (6) that correspond one by one to the telescopic columns (3) and can contact the telescopic columns (3).

2. The positioning mechanism for roll paper printing according to claim 1, characterized in that, The left end face of the top block (6) is an inclined surface that gradually rises from left to right.

3. The positioning mechanism for roll paper printing according to claim 1, characterized in that, The spindle cylinder (1) is provided with multiple sliding columns (7) that are slidably connected to the slider (5).

4. The positioning mechanism for roll paper printing according to claim 1, characterized in that, The mandrel cylinder (1) is coaxially rotatably connected to a stud (8) that is threadedly connected to the slider (5).

5. A positioning mechanism for roll paper printing according to claim 4, characterized in that, The stud (8) has a right end that passes through the mandrel cylinder (1) and is coaxially provided with a turntable (9).

6. The positioning mechanism for roll paper printing according to claim 1, characterized in that, The expansion plate (4) is provided with a reset post (10) that passes through the mandrel cylinder (1) on the left and right sides respectively. The free end of the reset post (10) is provided with a reset plate (11). A spring (12) is fitted on the reset post (10) between the reset plate (11) and the mandrel cylinder (1).

7. A positioning mechanism for roll paper printing according to claim 1, characterized in that, The outer surface of the expansion plate (4) is provided with an anti-slip layer.

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