Paper conveying head cam control air valve mechanism

Abstract

The utility model discloses a paper conveying head cam control air valve mechanism, which relates to the technical field of paper conveying head air distribution mechanisms and comprises a power shaft and different cams sequentially sleeved and fixed on the power shaft. The circumferential side faces of the paper separating suction air distribution cam, the paper transferring suction air distribution cam, the paper loosening blowing air distribution cam and the presser foot blowing air distribution cam make contact with one end of a double-end rotating piece and drive the double-end rotating piece to rotate, the other end of the double-end rotating piece is hinged to a valve rod sliding in an air valve, the two heads of the double-end rotating piece are arranged in an angle mode, a valve element is fixedly connected to the valve rod, and the two ends of the valve element are hinged to the two ends of the double-end rotating piece. The valve element abuts against the valve seat in a sealed mode, a valve rod and the valve element which are independent are arranged in the air valve in a matched mode according to different cams, and the air valve and the power shaft are arranged side by side. The paper conveying head cam control air valve mechanism is more compact in structure and more convenient to install, adjust and maintain, and the sealing performance of dynamic control of a valve element is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper feeding head gas distribution mechanism technical field, concretely relates to a paper feeding head cam control gas valve mechanism. BACKGROUND

[0002] The paper feeding head is an important component of the paper feeding machine, and its performance directly affects the performance of the paper feeding machine, is an important part requiring extremely high in printing machinery, and is called the heart of the paper feeding machine. At present, the paper feeding head at home and abroad is composed of six groups of mechanisms of frame, movement, gas distribution, paper distribution, paper delivery, paper surface height detection mechanism (commonly known as the presser foot mechanism). The machine, electricity and gas are integrated, the mechanism is not only complex, but also requires precise coordination between the actions of each mechanism. The existing paper feeding head gas distribution generally adopts a rotary air valve, the valve core of the rotary air valve body and the power input shaft are coaxially connected, the air port of the rotary air valve is controlled to open and close, and the gas distribution requirement is met. However, the power input shaft needs to be connected from the end, the axial length is relatively long, and the space occupied is very large.

[0003] For example, the patent with publication number CN203486607U discloses a power and gas valve mechanism of a paper feeding head, which comprises a power input shaft and a rotary air valve body, wherein the right end of the power input shaft penetrates through the right wall plate of the paper feeding head, and the left end is coaxially connected with the valve core of the rotary air valve body; the power input shaft is sequentially provided with a paper delivery cam and a presser foot cam from the right end to the left end; and the main body of the rotary air valve body is located in the left and right wall plates of the paper feeding head. CONTENT OF THE UTILITY MODEL

[0004] TECHNICAL PROBLEM TO BE SOLVED BY THE UTILITY MODEL

[0005] The technical problem to be solved by the utility model is to provide a paper feeding head cam control gas valve mechanism, which is more compact in structure, more convenient to install, adjust and maintain, and better in dynamic control sealing performance of the valve core.

[0006] TECHNICAL SCHEME

[0007] In order to solve the above problems, the technical scheme provided by the utility model is as follows:

[0008] A paper feeding head cam control air valve mechanism includes a power shaft and sequentially sleeved and fixed on the power shaft are a paper feeding secondary cam, a paper feeding main cam, a presser foot secondary cam, a presser foot main cam, a paper separating cam, a paper separating suction and air distribution cam, a paper feeding suction and air distribution cam, a paper releasing blowing and air distribution cam, and a presser foot blowing and air distribution cam. The peripheral side surfaces of the paper separating suction and air distribution cam, the paper feeding suction and air distribution cam, the paper releasing blowing and air distribution cam, and the presser foot blowing and air distribution cam are in contact with one end of a double-headed rotating member and drive the double-headed rotating member to rotate. The other end of the double-headed rotating member is hinged to a valve rod that slides in an air valve. The two heads of the double-headed rotating member are angularly arranged. A valve core is fixed on the valve rod and is in sealing abutment with a valve seat. Independent valve rods and valve cores are provided in the air valve for different cam matching. The air valve is arranged side by side with the power shaft.

[0009] A plurality of cams (a paper feeding secondary cam, a paper feeding main cam, a presser foot secondary cam, a presser foot main cam, a paper separating cam, a paper separating suction and air distribution cam, a paper feeding suction and air distribution cam, a paper releasing blowing and air distribution cam, and a presser foot blowing and air distribution cam) with different functions are sequentially fixed on the power shaft. These cams work cooperatively to complete various operations in the paper conveying process. The air valve is arranged side by side with the power shaft, reducing the space occupation and making the entire mechanism more compact. For each cam, independent valve rods and valve cores are provided in the air valve, ensuring that the control of each air flow channel is independent and precise. This not only improves the response speed of the system but also enhances the sealing performance, preventing air leakage. The sealing contact between the valve core and the valve seat ensures the complete sealing of the air flow channel in the closed state, maintaining good sealing effect even under frequent operation. One end of the double-headed rotating member is in contact with the peripheral side surface of the cam, and the other end is hinged to the valve rod. The two heads are angularly arranged. This design enables the action of the air valve to be directly driven by the rotation of the cam, reducing intermediate transmission links, simplifying the structure, and facilitating installation and maintenance. Since each cam and the corresponding air valve assembly are independent, they can be operated individually during installation, adjustment, or replacement without affecting the entire system, greatly improving maintenance efficiency. The cams with different functions act according to a predetermined sequence and time point, achieving precise control of multiple key steps (such as paper separation, alignment, and transmission) in the paper conveying process. The angular arrangement of the two heads of the double-headed rotating member allows precise adjustment of the valve rod movement according to the shape and position of the cam, enabling more precise air flow control.

[0010] As an option, the one end of the double-headed rotating member is rotationally connected with a movable roller.

[0011] The movable roller forms rolling contact with the cam surface instead of sliding contact. This greatly reduces the friction between the two, thereby reducing wear and extending the service life of the cam and the double-headed rotating member.

[0012] Optionally, the double-headed rotating member is hinged to the air valve, one end of the valve stem of the double-headed rotating member is provided with an elastic return member, and the elastic force of the elastic return member presses the other end of the double-headed rotating member against the peripheral side surface of the cam.

[0013] The elastic force provided by the elastic return member can ensure that one end of the double-headed rotating member is always pressed against the peripheral side surface of the cam, and stable contact can be maintained even if the cam profile changes or there is a slight manufacturing error. If the gap between the double-headed rotating member and the cam changes due to wear or other reasons, the elastic return member can automatically adjust the pressure to compensate for these minor changes and ensure normal operation of the system. When the cam profile changes suddenly (e.g., from a low point to a high point), the elastic return member can absorb part of the impact energy, slow down the action of the double-headed rotating member, and avoid damage to the components or noise due to instantaneous excessive force.

[0014] Optionally, the valve stem passes through the valve seat, the valve core, and the return base, and a return spring is connected between the valve core and the return base.

[0015] Return spring: installed between the valve core and the return base, providing an elastic force that allows the valve core to automatically return to the closed state without external force.

[0016] Optionally, a sealing ring is provided between the valve seat and the housing of the air valve.

[0017] The sealing ring is installed on the contact surface between the valve seat and the housing of the air valve, effectively preventing gas leakage from the gap between them, and ensuring the sealing of the gas flow path.

[0018] Optionally, a vertical channel is connected to the air passage inside the air valve, and a valve closing piston is provided in the channel, and the valve closing piston is connected to a control rod.

[0019] The valve closing piston is located in the vertical channel and is used to directly control the opening and closing of the gas flow. The valve closing piston can move horizontally as needed to change the opening and closing state of the air passage. The valve closing piston is connected to the control rod, and the movement of the control rod can directly drive the action of the valve closing piston.

[0020] Optionally, the air ports of the air valves are staggered in position for different cams.

[0021] The staggered air port arrangement can optimize the pipeline connection between the air valves and the external gas source or actuator, reduce pipeline crossing and winding, and reduce installation complexity and failure risk. Each air valve and its corresponding air port are relatively independent, facilitating individual inspection, adjustment, or replacement, reducing maintenance time and cost.

[0022] Optionally, the two heads of the double-headed rotating member are arranged at an angle of 0° to 180°.

[0023] The angle of the two heads of the double-head rotating member relates to the position setting of the power shaft and the air valve, when the angle is acute, the power shaft is substantially parallel to the air valve, and when the angle is obtuse, the power shaft is below the air valve, and the double-head rotating member with different angles can be replaced according to the requirement of the installation space.

[0024] Advantages

[0025] Compared with the prior art, the technical scheme has the following advantages:

[0026] The technical scheme is highly integrated and optimized, and is used for accurately controlling airflow in the paper conveying process, so as to realize the functions of paper separation, transmission and alignment. The mechanism drives the valve rod in the air valve to move through the cooperation of a series of cams and the double-head rotating member, so as to control the opening and closing and adjustment of the airflow. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structure diagram of a paper conveying head cam control air valve mechanism is provided for the embodiment of the utility model;

[0028] Figure 2 A sectional view diagram of a paper separating suction and air distribution place of a paper conveying head cam control air valve mechanism is provided for the embodiment of the utility model;

[0029] 1, shaft seat; 2, power shaft; 3, paper conveying auxiliary cam; 4, paper conveying main cam; 5, presser foot auxiliary cam; 6, presser foot main cam; 7, paper separating cam; 8, paper separating suction and air distribution cam; 9, paper conveying suction and air distribution cam; 10, paper loosening blowing and air distribution cam; 11, presser foot blowing and air distribution cam; 12, bearing; 13, movable roller; 14, valve rod; 15, shell; 16, double-head rotating member; 17, elastic reset member; 18, guide pin; 19, valve seat; 20, valve core; 21, reset spring; 22, reset base; 23, paper separating suction and air distribution port; 24, air channel; 25, paper separating suction nozzle port; 26, valve closing piston; 27, control rod. DETAILED DESCRIPTION

[0030] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings and the embodiment.

[0031] EMBODIMENT

[0032] In combination with the drawings Figure 1A cam control air valve mechanism of a paper feed head comprises a power shaft 2, a paper feed sub-cam 3, a paper feed main cam 4, a presser sub-cam 5, a presser main cam 6, a paper separating cam 7, a paper separating air suction and distribution cam 8, a paper feed air suction and distribution cam 9, a paper releasing air blowing and distribution cam 10 and a presser air blowing and distribution cam 11 which are sequentially sleeved and fixed on the power shaft 2. The circumferential side surface of the paper separating air suction and distribution cam 8, the paper feed air suction and distribution cam 9, the paper releasing air blowing and distribution cam 10 and the presser air blowing and distribution cam 11 are in contact with one end of a double-end rotating member 16 and drive the double-end rotating member 16 to rotate. The paper feed sub-cam 3 and the paper feed main cam 4 are extended by the same sleeve shaft, and the presser sub-cam 5 and the presser main cam 6 are extended by the same sleeve shaft. The sleeve shaft and other cams are provided with a flat key connected with the power shaft 2 to prevent rotation. The paper separating air suction and distribution port 23 is located at the top of the shell 15, and similarly, a paper feed air suction port, a paper releasing air blowing port and a presser air blowing port are also provided. The air ports of the air valve are staggered in position for different cams.

[0033] The power shaft 2 is provided with a shaft seat 1 and a bearing 12 at both ends, which are mounted on the paper feed head.

[0034] The paper feed sub-cam 3, the paper feed main cam 4, the presser sub-cam 5, the presser main cam 6, the paper separating cam 7, the paper separating air suction and distribution cam 8, the paper feed air suction and distribution cam 9, the paper releasing air blowing and distribution cam 10 and the presser air blowing and distribution cam 11 are all conjugate cams. The conjugate cam refers to the contours of two or more cams which are carefully designed so that their motion trajectories cooperate with each other to achieve a specific motion of the driven member. The contour curve of each cam is designed according to the motion characteristics of another cam to ensure the coordination and consistency of the motion between them. The conjugate cams are installed on the same power shaft 2 and drive the double-end rotating member 16 to rotate by a certain angle through rotation. Since the contours of the cams are matched with each other, the motion of the driven member can be very accurate and stable.

[0035] The drawings are attached Figure 2 The other end of the double-end rotating member 16 is hinged to a valve rod 14 which slides in the air valve. In this embodiment, there are four sets of double-end rotating members 16 and valve rods 14. The air valve is provided with four air flow channels. The four sets of double-end rotating members 16 pass through the same pin shaft which is fixed on the side of the shell 15.

[0036] The two heads of the double-headed rotating member 16 are arranged at an angle, and the two heads of the double-headed rotating member 16 are arranged at an angle of 0°-180°. In this embodiment, the two heads of the double-headed rotating member 16 can be arranged at an angle of 0°, 60° or 180°. When the two heads of the double-headed rotating member 16 are arranged at an angle of 0° and 180°, the double-headed rotating member 16 is a single rod, and the hinge between the movable roller 13 and the valve rod 14 forms a straight lever structure. The difference lies in whether the hinge between the movable roller 13 and the valve rod 14 is on one side or both sides of the single-sided pin shaft connection between the double-headed rotating member 16 and the shell 15. The valve rod 14 is fixedly connected with a valve core 20, and the valve core 20 is in sealing abutment with a valve seat 19. In the gas valve, independent valve rods 14 and valve cores 20 are provided for different cam matching. The gas valve is arranged side by side with the power shaft 2.

[0037] One end of the double-headed rotating member 16 is rotatably connected with the movable roller 13. The double-headed rotating member 16 is hinged to the gas valve, and one end of the valve rod 14 of the double-headed rotating member 16 is provided with an elastic reset member 17. The elastic force of the elastic reset member 17 presses the other end of the double-headed rotating member 16 against the peripheral side surface of the cam. The elastic reset member 17 includes a spring and a guide column. The guide column is fixed to the side wall of the shell 15, and the spring is sleeved on the guide column and connected to the groove of the double-headed rotating member 16 at the other end. The groove is used for limiting and fixing the spring.

[0038] The valve rod 14 penetrates through the valve seat 19, the valve core 20 and the reset base 22, and the reset spring 21 is connected between the valve core 20 and the reset base 22. The valve seat 19 is provided with a sealing ring between the valve seat 19 and the shell 15 of the gas valve.

[0039] The gas passage 24 in the gas valve is communicated with a vertical channel, and the channel is provided with a closing valve piston 26 connected to a control rod 27.

[0040] Working process

[0041] Initial state:

[0042] The gas valve is in a closed state, and the valve core 20 is tightly attached to the valve seat 19 under the action of the reset spring 21, thereby blocking the gas passage 24 and preventing gas flow.

[0043] The movable roller 13 of the double-headed rotating member 16 keeps in contact with the cam surface, but due to the absence of external force, the other end of the double-headed rotating member 16 is pressed against the peripheral side surface of the cam through the elastic reset member 17.

[0044] Opening process:

[0045] When the power shaft 2 rotates, each cam in turn pushes the movable roller 13 of the double-headed rotating member 16.

[0046] The movable roller 13 follows the contour change of the cam, so that the double-headed rotating member 16 rotates around the hinge point and drives the valve rod 14 to move upward.

[0047] The upward movement of the valve stem 14 causes the closing piston 26 to rise, opening the gas passage 24 and allowing gas to pass through.

[0048] The gas passes through the gas valve into the corresponding actuator (such as a suction nozzle, a blowing nozzle, etc.), achieving the separation, alignment or transmission of paper.

[0049] Maintained state:

[0050] As long as the cam continues to push the double-headed rotating piece 16, the gas valve will remain in the open state, and the gas flow can continue to pass through the gas passage 24 to perform the required conveying or control function.

[0051] During this period, the angle setting (0°~180°) of the double-headed rotating piece 16 can be adjusted according to the profile change of the cam, ensuring that the action of the gas valve is more stable and accurate.

[0052] Closing process:

[0053] When the profile of the cam changes to the low point, the double-headed rotating piece 16 loses external thrust and is automatically reset under the action of the elastic reset piece 17, moving the valve stem 14 downward.

[0054] The closing piston 26 re-descends, blocking the gas passage 24 and cutting off the gas flow, restoring the sealed state.

[0055] The reset spring 21 further ensures that the valve core 20 is tightly attached to the valve seat 19, preventing any gas leakage.

[0056] The above describes the utility model and its embodiments in a schematic manner, which is not restrictive. The drawings shown are only one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the utility model.

Claims

1. A paper feed head cam-controlled air valve mechanism characterized by comprising: The power shaft is provided with a paper feeding sub-cam, a paper feeding main cam, a presser sub-cam, a presser main cam, a paper separating cam, a paper feeding air distributing cam, a paper separating air distributing cam, a paper loosening air distributing cam and a presser air distributing cam, which are sequentially sleeved and fixed on the power shaft, the periphery of the paper separating air distributing cam, the paper feeding air distributing cam, the paper loosening air distributing cam and the presser air distributing cam is in contact with one end of a double-end rotating member and drives the double-end rotating member to rotate, the other end of the double-end rotating member is hinged to a valve rod which slides in an air valve, the valve rod is fixed with a valve core which is in sealing contact with a valve seat, the air valve is provided with independent valve rods and valve cores for different cam matching, and the air valve is arranged side by side with the power shaft.

2. A cam-controlled air valve mechanism for a paper feed head according to claim 1, wherein One end of the double-end rotating member is rotationally connected with a movable roller.

3. A cam-controlled air valve mechanism for a paper feed head according to claim 1 or 2, characterized in that The double-end rotating member is hinged to the air valve, one end of the valve rod of the double-end rotating member is provided with an elastic reset member, and the elastic force of the elastic reset member presses the other end of the double-end rotating member against the periphery of the cam.

4. A cam-controlled air valve mechanism for a paper feed head according to claim 1, wherein The valve rod penetrates through the valve seat, the valve core and a reset base, and a reset spring is connected between the valve core and the reset base.

5. A cam-controlled air valve mechanism for a paper feed head as defined in claim 4, wherein A sealing ring is arranged between the valve seat and the shell of the air valve.

6. A cam-controlled air valve mechanism for a paper feed head according to claim 1, wherein A vertical channel is in communication with an air passage in the air valve, a closing valve piston is arranged in the channel, and the closing valve piston is connected with a control rod.

7. A cam-controlled air valve mechanism for a paper feed head as defined in claim 1, wherein The air ports of the air valve are staggered in the setting positions of different cams.

8. A cam-controlled air valve mechanism for a paper feed head according to claim 1, wherein The two heads of the double-end rotating member are arranged at an angle of 0°-180°.

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