A paper overlapping prevention printing feeding port jam prevention mechanism

Abstract

The utility model discloses a kind of printing feeding port anti-jamming mechanisms of preventing paper overlapping, belong to printing field, install in the front end of the feeding port of printing equipment, comprising: base, guide piece group and limiting rod, the guide sheet group includes two arc-shaped sheet parts respectively installed with the both sides of the base, each the arc-shaped sheet part includes first arc-shaped sheet and second arc-shaped sheet arranged in upper and lower, the first arc-shaped sheet below is bent downward, the second arc-shaped sheet above is bent upward;The limiting rod is transversely arranged above the guide piece group, and is rotatably installed in the base by the pivot of two ends.

Description

Technical Field

[0001] This utility model relates to the printing field, specifically to a printing feed port anti-jamming mechanism to prevent paper overlap. Background Technology

[0002] Currently, most automatic feeding mechanisms in the printing industry rely on mechanical rollers and suction systems to feed sheets of paper one by one into the printing channel. However, at high speeds or with thinner paper, paper overlap, skewness, or paper jams are prone to occur, affecting printing accuracy and potentially damaging printing plates or cylinders, causing downtime and material waste. Some existing feeding devices attempt to identify paper status using electronic sensors and photoelectric detection, but these methods are costly, complex to maintain, and poorly adapted to dusty or ink-contaminated environments, making them unsuitable for traditional printing equipment that requires simplified structure and convenient maintenance. Utility Model Content

[0003] One objective of this invention is to solve the problems of multiple sheets of paper being stacked and paper jams that easily occur in the existing printing feeding process by physically separating the paper.

[0004] Specifically, this utility model discloses a printing feed port anti-jamming mechanism to prevent paper overlap, which is installed at the front end of the feed port of a printing equipment. It includes a base, a guide plate group, and a limiting rod. The guide plate group includes two arc-shaped plate portions respectively installed on both sides of the base. Each arc-shaped plate portion includes a first arc-shaped plate and a second arc-shaped plate arranged vertically. The first arc-shaped plate located below bends downward, and the second arc-shaped plate located above bends upward. The limiting rod is arranged horizontally above the guide plate group and is rotatably installed on the base through the rotating shafts at both ends.

[0005] Furthermore, the spacing between the two arc-shaped sections is less than the width of the paper, and the end of each arc-shaped section forms a channel for a single sheet of paper to pass through.

[0006] Furthermore, the ends of both the first and second arc-shaped pieces are bent in the opposite direction to the channel.

[0007] Furthermore, a flexible protrusion for contacting the paper is provided below the limiting rod.

[0008] Furthermore, the flexible protrusions are provided in multiple quantities, and the multiple flexible protrusions have the same height.

[0009] Furthermore, it also includes a synchronizing link, with rotating arms at both ends of the limiting rod, and the rotating arms are connected by a synchronizing link.

[0010] Furthermore, the synchronizing link is located behind the limiting rod, is arranged along the length of the limiting rod, and is arranged parallel to the support structure above the feeding port.

[0011] Furthermore, it also includes a damper, which is located at the connection between the rotating shaft and the limiting rod.

[0012] Furthermore, the base is provided with an adjustable height slide rail for adjusting the gap between the guide springs.

[0013] Furthermore, the gap between the limiting rod and the guide spring is less than twice the thickness of a single sheet of paper.

[0014] In this invention, two arc-shaped pieces together form a guide channel for the paper. A limiting rod is horizontally positioned above the guide piece group, with its two ends rotatably mounted on the base. The limiting rod remains stationary when not under force. When paper overlaps or has abnormal thickness during the feeding process, it is lifted by the leading edge of the paper and rotates, thereby blocking the abnormal paper. This invention has low cost, strong maintainability, and strong environmental adaptability.

[0015] In this invention, the distance between the two arc-shaped pieces is less than the width of the paper, the width of the channel formed between the ends of each arc-shaped piece is slightly less than the width of the paper, and the free ends of the first and second arc-shaped pieces are both bent in the opposite direction of the feeding channel to form a relatively tight structure, which facilitates flexible constraint on the paper path.

[0016] In this invention, the lower part of the limiting rod is provided with a plurality of flexible protrusions for contacting the paper. The flexible protrusions are evenly distributed along the length of the limiting rod and have the same height. They are used to generate resistance before the limiting rod is lifted at the leading edge of the paper, forming a buffer and assisting in judging the paper thickness.

[0017] In this invention, to ensure that the limiting rod is subjected to synchronous force at both ends during feeding, a rotating arm is provided at each end of the limiting rod. The rotating arm is connected by a horizontally arranged synchronous connecting rod, which is located behind the limiting rod, along the length of the limiting rod, and arranged parallel to the support structure above the feeding port. When the limiting rod rotates under force at one end, the synchronous connecting rod can transmit the rotational motion to the other rotating arm, achieving synchronous lifting of the entire limiting rod.

[0018] In this invention, a damper is located at the connection between the rotating shaft and the limiting rod. The damper is used to control the falling speed of the limiting rod, so that it slowly resets after release, thus avoiding secondary paper feeding due to inertial swing.

[0019] In this invention, the vertical gap between the limiting rod and the guide plate is set to be less than twice the thickness of a single sheet of paper, so as to prevent two or more sheets of paper from entering the guide channel at the same time and to improve the identification and interception efficiency of the limiting rod in abnormal conditions.

[0020] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0021] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0022] Figure 1 This is a three-dimensional schematic diagram of a printing feed port anti-jamming mechanism for preventing paper overlap in one or more embodiments of the present utility model.

[0023] Figure 2 This is a top view schematic diagram of a printing feed port anti-jamming mechanism for preventing paper overlap in one or more embodiments of the present utility model.

[0024] Figure 3 This is a partial sectional view from the side angle of the anti-jamming mechanism for the printing feed port that prevents paper overlap in one or more embodiments of the present invention.

[0025] Figure 4 This is a partial cross-sectional view from the left angle of one or more embodiments of the present invention of a printing feed port anti-jamming mechanism for preventing paper overlap.

[0026] In the picture:

[0027] 1-Base; 2-Guide plate group; 3-Limiting rod; 4-Flexible protrusion; 5-Synchronous connecting rod; 11-Base side wall; 21-First arc-shaped plate; 211-Upper arc-shaped plate; 2111-Chamfer structure; 212-Lower arc-shaped plate; 2222-Second arc-shaped plate; 51-Rotating arm. Detailed Implementation

[0028] In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0029] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Please refer to Figures 1-4 This utility model discloses a printing feed port anti-jamming mechanism to prevent paper overlap. It is installed at the front end of the feed port of a printing equipment, consisting of a base 1, a guide plate group, and a limiting rod 3. The guide plate group includes two arc-shaped plates respectively installed on both sides of the base 1. Each arc-shaped plate includes a lower arc-shaped plate 212 and an upper arc-shaped plate 211 arranged vertically. The lower arc-shaped plate 212 is bent downward, and the upper arc-shaped plate 211 is bent upward. The limiting rod 3 is arranged horizontally above the guide plate group and is rotatably installed on the base 1 through the rotating shafts at both ends.

[0031] According to one embodiment of this utility model, the base 1 is a long strip structure, horizontally arranged in front of the feed port of the printing equipment, and serves as a mounting reference platform for all upper components. The base 1 is made of metal plate or high-strength engineering plastic, with symmetrical fixing seats on the upper part and through holes at the bottom for fixing to the feed platform with bolts.

[0032] According to one embodiment of this utility model, the guide plate assembly includes two arc-shaped plate portions respectively installed on the left and right sides of the base 1, namely a first arc-shaped plate portion 21 and a second arc-shaped plate portion 2222. Each arc-shaped plate portion includes a lower arc-shaped plate 212 and an upper arc-shaped plate 211, which are arranged vertically to form a layered clamping structure. The lower arc-shaped plate 212 is located at the bottom and is made of elastic material. Its middle part is slightly bent downward to form a concave guide rail structure, which facilitates automatic centering of the paper when it passes downward. The upper arc-shaped plate 211 is located at the top and is slightly bent upward to form a flexible upper stop structure to limit the paper from curling up.

[0033] According to one embodiment of this utility model, the end of each arc-shaped piece is slightly curved in the opposite direction of the feeding direction (i.e., the opposite direction of the paper entry direction) to form a chamfered structure 2111, thereby providing gentle guidance when the paper contacts the guide piece. The spacing between two arc-shaped pieces is slightly smaller than the width of the paper, thus forming a channel with a flexible clamping function to achieve physical restriction of the paper position.

[0034] According to one embodiment of this utility model, the limiting rod 3 is arranged horizontally above two arc-shaped sheet groups, and its two ends are respectively installed in the upper connecting holes of the base 1 through rotating shafts. The limiting rod 3 is a hollow round or square rod made of metal or plastic, and multiple flexible protrusions 4 are provided below it, distributed along the lower edge of the limiting rod 3, for contacting the paper surface when the paper passes under the limiting rod 3, thereby judging the thickness of the paper. When two or more sheets of paper overlap, the overall thickness increases, which will push up the limiting rod 3, and the limiting rod 3 will rotate slightly around the rotating shaft, thereby blocking the paper from continuing to enter the feeding channel.

[0035] According to one embodiment of this utility model, to prevent the limiting rod 3 from rotating or deflecting asymmetrically, it is provided with rotating arms 51 at both ends. The two rotating arms 51 are connected by a synchronous connecting rod 5, which is arranged parallel to the limiting rod 3 and located behind the limiting rod 3. The synchronous connecting rod 5 is a slender metal rod, with its two ends connected to the two rotating arms 51 by pins, so that when the limiting rod 3 is lifted by force at one end, the other end can move synchronously, thereby maintaining the overall horizontal lifting of the limiting rod 3 and avoiding unilateral imbalance. To control the fall speed of the limiting rod 3, a damper is connected to the rotating shaft at one end. The damper is a hydraulic or silicone grease buffer type structure, installed between the base 1 and the limiting rod 3, used to limit the rapid fall of the limiting rod 3 after it is lifted, ensuring a smooth return action and avoiding impact on the paper or causing the paper to jump.

[0036] According to one embodiment of the present invention, the base 1 is also provided with adjustable mounting rails on both sides for mounting the arc-shaped pieces in the guide plate group. The rails are provided with locking screws for adjusting the clamping gap. The operator can make appropriate adjustments according to the thickness and width of the paper to ensure that the paper channel remains in a suitable state in different application scenarios.

[0037] According to one embodiment of this utility model, in actual use, paper is fed into the anti-jamming mechanism from the pre-feeding mechanism of the printing equipment. The paper channel, composed of guide plates, guides the paper forward, and automatic correction is achieved through the flexible tension of the guide springs. When only a single sheet of paper enters the channel, the paper thickness will not trigger the limiting rod 3, allowing it to pass smoothly. If multiple sheets of paper are stacked, the total thickness exceeds the gap between the limiting rod 3 and the guide plates. The leading edge of the paper contacts the flexible protrusion 4 and pushes up the limiting rod 3, thus being blocked by the limiting rod 3. This prevents the overlapping paper from entering the main feeding system, thereby effectively reducing the risk of paper jams and reprints.

[0038] According to one embodiment of this utility model, to improve the adaptability of this anti-jamming mechanism under different working conditions, the lower arc-shaped piece 212 and the upper arc-shaped piece 211 in the guide piece assembly are preferably stamped from elastic stainless steel sheets (such as 301 spring steel), with a sheet thickness of about 0.3mm to 0.5mm. Their bending radius can be selected in the range of 10mm to 30mm depending on the paper type. The bending structure can be controlled to ensure consistency, so that the tension of each batch of spring pieces remains relatively constant, avoiding fluctuations in paper feeding effect due to batch differences. In terms of structural arrangement, the fixed end of the lower arc-shaped piece 212 is connected to the side wall 11 of the base by screws or rivets, and its middle section has a downward bending structure with a maximum downward bending displacement of about 3mm to 5mm. The upper arc-shaped piece 211 is installed on the lower arc-shaped piece 212, and its middle section is bent upward with a maximum upward arch height of about 2mm to 4mm. The length of the "clamping area" formed between the two pieces is about 20mm to 30mm, which ensures that the leading edge of the entire sheet of paper can pass through without causing pressing or sliding resistance. To facilitate disassembly and maintenance, both the lower arc-shaped piece 212 and the upper arc-shaped piece 211 can be configured with different tension specifications to handle special papers (such as Xuan paper, special cardstock, etc.) when necessary.

[0039] According to one embodiment of this utility model, the limiting rod 3 is made of lightweight aluminum alloy extruded profile, and its cross-section can be square or circular. The rod length is set according to the actual width of the feed port (for example, the width of A3 is set to 310mm). Multiple evenly distributed through holes or T-shaped grooves are opened in the middle of the rod body for inserting flexible protrusions 4. The flexible protrusions 4 are preferably made of silicone or thermoplastic rubber, and their height is about 1.5mm to 2mm.

[0040] According to one embodiment of this utility model, the rotating shaft is machined from a stainless steel rod with a diameter of approximately 4mm to 6mm. Both ends are inserted into shaft holes provided on the base 1, with a fitting accuracy of H7 / g6, ensuring smooth rotation without significant clearance. One end of the rotating shaft has a flat head structure for assembling and positioning the limiting rod 3, and the other end is connected to a damper. The damper adopts a rotary silicone oil damping structure.

[0041] According to one embodiment of this utility model, L-shaped rotating arms 51 are fixed to both ends of the limiting rod 3 by screws. The rotating arms 51 are made of stamped steel plate, with one end fixed to the limiting rod 3 and the other end having a through connection hole. The two rotating arms 51 are connected by a synchronous connecting rod 5. The connecting rod is a slender solid metal rod or aluminum alloy tube with a diameter of 6mm to 8mm, and its two ends are connected to the rotating arms 51 by pins to form a rotating pair structure. The synchronous connecting rod 5 is arranged 10mm to 20mm behind the limiting rod 3, parallel to the limiting rod 3. When one side of the limiting rod 3 is lifted, the other side achieves synchronous action through the connecting rod transmission, maintaining the horizontality of the entire limiting rod 3.

[0042] According to one embodiment of this utility model, to prevent interference when paper passes between the limiting rod 3 and the guide plate, a fixed vertical gap is set between the limiting rod 3 and the upper edge of the guide plate. This gap is slightly less than twice the thickness of ordinary printing paper (approximately 0.18mm to 0.25mm). A single sheet of paper can pass smoothly, but if two sheets of paper are present, the total thickness will exceed this gap, thereby triggering the limiting rod 3 to effectively identify and block overlapping papers.

[0043] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A printing feed inlet anti-jamming mechanism to prevent paper overlap, installed at the front end of the feed inlet of a printing equipment, characterized in that, include: The base, guide plate assembly, and limiting rod are provided. The guide plate assembly includes two arc-shaped plate portions respectively installed on both sides of the base. Each arc-shaped plate portion includes a first arc-shaped plate and a second arc-shaped plate arranged vertically. The first arc-shaped plate located below is bent downwards, and the second arc-shaped plate located above is bent upwards. The limiting rod is arranged horizontally above the guide plate assembly and is rotatably installed on the base through the pivots at both ends.

2. The anti-jamming mechanism for the printing feed inlet to prevent paper overlap according to claim 1, characterized in that, The spacing between the two arc-shaped sections is less than the width of the paper, and the end of each arc-shaped section forms a channel for a single sheet of paper to pass through.

3. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 2, characterized in that, The ends of both the first and second arc-shaped pieces are bent in the opposite direction to the channel.

4. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 1, characterized in that, The limiting rod has a flexible protrusion below it for contacting the paper.

5. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 4, characterized in that, The flexible protrusions are provided in multiple quantities, and the multiple flexible protrusions have the same height.

6. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 1, characterized in that, It also includes a synchronizing link, and each end of the limiting rod is provided with a rotating arm, which is connected by a synchronizing link.

7. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 6, characterized in that, The synchronous connecting rod is located behind the limiting rod, is set along the length of the limiting rod, and is arranged parallel to the support structure above the feeding port.

8. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 1, characterized in that, It also includes a damper, which is located at the connection between the rotating shaft and the limiting rod.

9. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 1, characterized in that, The base is equipped with an adjustable slide rail for adjusting the gap between the guide springs.

10. The anti-jamming mechanism for the printing feed port to prevent paper overlap according to claim 1, characterized in that, The gap between the limiting rod and the guide spring is less than twice the thickness of a single sheet of paper.

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