A push cylinder for a presser foot machine

Abstract

This utility model discloses a press-fit machine push cylinder in the field of cylinder control and gas power linkage technology, including a main cylinder. The main cylinder includes a cylinder barrel, a front end cover, a rear end cover, a piston, and a piston rod. The front end cover and the rear end cover are respectively fixed to the axial ends of the cylinder barrel. Both the front end cover and the rear end cover have radially penetrating air inlet and air outlet. The front end cover has a trigger pressure relief rod on the side facing the inside of the cylinder barrel. By setting a trigger chamber inside the front end cover that extends radially to the middle of the cylinder barrel, and arranging a linkage trigger rod with a square spring in the trigger chamber, and setting a pressure storage chamber above the front end cover that communicates with the trigger chamber, when the piston moves to the middle of the cylinder barrel, it can squeeze the linkage trigger rod to open the air inlet and the communication port, and introduce most of the high-pressure gas in the cylinder barrel that has not been discharged by the air outlet of the front end cover into the pressure storage chamber for temporary storage, so as to achieve the purpose of pre-storing a sufficient high-pressure gas source and realize the rapid release of gas pressure when triggering pressure relief later.

Description

Technical Field

[0001] This utility model relates to the field of cylinder control and gas power linkage technology, and in particular to a push cylinder for a buckle press machine. Background Technology

[0002] In the field of automated production of crimping machines, double-acting cylinders are the core power components that enable the reciprocating push of the crimping actuator. Compressed air is alternately introduced through the air inlets at both ends of the cylinder barrel, driving the piston and piston rod to move along the cylinder barrel axis, thereby driving the crimping component to complete the crimping operation on the workpiece. It is widely used in fastener assembly scenarios in industries such as hardware, textiles, and electronics. To ensure the continuity and automation of the crimping operation, crimping machines usually need to be equipped with external linkage devices such as feeding mechanisms and sorting mechanisms. The activation of these devices needs to be coordinated with the stroke state of the double-acting cylinder.

[0003] Existing buckle press machines rely on the end of their stroke to trigger pressure relief when the cylinder is linked to an external device. The pressure relief force primarily comes from the remaining air pressure in the corresponding chamber at the end of the stroke. Since this air pressure is gradually consumed as the cylinder travels further, in practical applications, the required pressure value for relief is often insufficient, resulting in weak air pressure. Furthermore, these devices can only initiate pressure relief at the end of the stroke using the remaining air pressure, leading to slow response speed and poor sensitivity, making it difficult to quickly provide a stable and sufficiently strong air pressure signal to the external linkage device. Therefore, we propose a buckle press machine cylinder to solve the aforementioned problems. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] Therefore, the purpose of this utility model is to provide a press-fit machine push cylinder that can solve the problem that when the existing press-fit machine push cylinder is linked with an external device, it relies on the end of the stroke to trigger pressure relief. Its pressure relief power mainly comes from the remaining air pressure in the corresponding chamber of the cylinder at the end of the stroke. Since this air pressure is gradually consumed as the cylinder stroke progresses, in practical applications, the pressure value required for pressure relief is often insufficient and the air pressure intensity is weak. Moreover, such devices can only start the pressure relief action at the end of the stroke by relying on the remaining air pressure, resulting in a slow pressure relief response speed, poor sensitivity, and difficulty in quickly providing a stable and sufficiently strong air pressure signal to the external linkage device.

[0006] To solve the above-mentioned technical problems, this utility model provides a pressing machine push cylinder, which adopts the following technical solution: it includes a main cylinder, the main cylinder including a cylinder barrel, a front end cover, a rear end cover, a piston, and a piston rod. The front end cover and the rear end cover are respectively fixed to the two axial ends of the cylinder barrel. A guide hole is opened at the axial center of the front end cover. The piston is coaxially fixed to the rear end of the piston rod. Both the front end cover and the rear end cover are provided with radially penetrating air inlet and air outlet holes. A trigger pressure relief rod is provided on the side of the front end cover facing the inside of the cylinder barrel. The trigger pressure relief rod is used to release the pressure at the front end of the piston when the piston moves to the front end of the cylinder barrel and presses against it, so as to realize the linkage with the external device.

[0007] Optionally, a trigger chamber is provided on the right side of the front cover. The trigger chamber extends radially along the cylinder and extends to the middle of the cylinder. A trigger port communicating with the inside of the cylinder is provided at the tail end of the trigger chamber near the middle of the cylinder. An air inlet communicating with the trigger chamber is provided on the side of the front cover facing the inside of the cylinder. The trigger chamber is connected to the inside of the cylinder through the air inlet.

[0008] Optionally, a linkage trigger rod is radially movably arranged inside the trigger cavity. The trigger cavity is provided with several integrally formed limiting posts. The linkage trigger rod is limited by the limiting posts to move only radially inside the trigger cavity. The head of the linkage trigger rod is provided with an integrally formed contact protruding outside the trigger port. The head of the linkage trigger rod extends to the position inside the front cover of the trigger cavity and is recessed. A square spring is provided between the head of the linkage trigger rod and the inside of the front cover. The square spring applies inward pressure to the linkage trigger rod.

[0009] Optionally, a pressure storage chamber is provided inside the front end cover. The pressure storage chamber is connected to the trigger chamber through a communication port. When the head of the linkage trigger rod is located at the bottom of the trigger chamber, the head of the linkage trigger rod simultaneously blocks the air inlet and the communication port. When compressed air is introduced into the air inlet of the rear end cover, it drives the piston to move forward along the cylinder axis. When the piston moves to the middle of the cylinder, the piston will squeeze the contact head radially outward, so that the linkage trigger rod overcomes the pressure of the square spring and moves radially outward along the trigger chamber. After the linkage trigger rod moves radially outward, the air inlet opens and communicates with the inside of the cylinder. The gas inside the cylinder is sequentially poured into the pressure storage chamber through the air inlet, the trigger chamber and the communication port.

[0010] Optionally, a trigger pressure relief rod is axially mounted inside the pressure storage chamber. A return spring is provided between the front of the trigger pressure relief rod and the front end cover. The return spring always applies a rearward force to the trigger pressure relief rod. An airflow baffle is integrally formed at the tail of the trigger pressure relief rod.

[0011] Optionally, the pressure storage chamber has a pressure relief port at a position corresponding to the airflow baffle, and the pressure relief port is positioned opposite to the airflow baffle when the pressure relief rod is not triggered. The pressure relief port is provided with a pressure relief interface, and the pressure relief port is connected to the outside of the front cover directly above it through the pressure relief interface.

[0012] In summary, this utility model has at least one of the following beneficial effects: 1. By setting a trigger chamber extending radially to the middle of the cylinder inside the front cover, and configuring a linkage trigger rod with a square spring inside the trigger chamber, and setting a pressure storage chamber above the front cover that communicates with the trigger chamber, when the piston moves to the middle of the cylinder, it can squeeze the linkage trigger rod to open the air inlet and the communication port, and introduce most of the high-pressure gas in the cylinder that has not been discharged by the vent hole of the front cover into the pressure storage chamber for temporary storage. This avoids the problem of insufficient pressure caused by the traditional device relying on the remaining air pressure at the end of the stroke, and achieves the purpose of pre-storing sufficient high-pressure gas source, so that the air pressure can be quickly released when triggering depressurization later.

[0013] 2. By installing a trigger relief rod with a return spring and an airflow baffle inside the pressure storage chamber, and opening a pressure relief port with a pressure relief interface at the corresponding position of the pressure storage chamber, combined with the design of blocking the air inlet and the connecting port when the linkage trigger rod is reset, when the piston moves to the front end of the cylinder and pushes the trigger relief rod, the airflow baffle disengages from the pressure relief port, and the high-pressure gas in the pressure storage chamber can be discharged in a directional manner through the pressure relief interface. At the same time, the air pressure passage between the cylinder and the pressure storage chamber is cut off, so as to control the timing and path of air pressure release. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall half-section structure of this utility model; Figure 3 This is a schematic diagram of the front cover and cylinder structure of this utility model; Figure 4 This is a schematic diagram of the front cover and related components of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Main cylinder; 12. Cylinder barrel; 14. Rear end cap; 141. Air inlet; 142. Air vent; 15. Piston; 16. Piston rod; 17. Square spring; 18. Pressure relief port; 13. Front cover; 131. Guide hole; 132. Trigger chamber; 1321. Trigger port; 1322. Air inlet; 1323. Limiting post; 133. Pressure storage chamber; 134. Connecting port; 135. Pressure relief port; 2. Linkage trigger lever; 21. Contact pressure head; 3. Trigger relief lever; 31. Return spring; 32. Airflow baffle. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0018] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; 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. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected through a transitional structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail below.

[0022] Example 1, refer to Figures 1-4 In this embodiment, to address the problem that existing pressure-relieving devices rely on the end of the stroke to trigger pressure release when the cylinder of a pressure-pressing machine is linked with an external device, and the pressure release power mainly comes from the remaining air pressure in the corresponding chamber of the cylinder at the end of the stroke, this air pressure is gradually consumed as the cylinder stroke progresses. In practical applications, the pressure value required for pressure release is often insufficient, and the air pressure intensity is weak. Furthermore, these devices can only initiate the pressure release action at the end of the stroke by relying on the remaining air pressure, resulting in a slow pressure release response speed, poor sensitivity, and difficulty in quickly providing a stable and sufficiently strong air pressure signal to the external linkage device. This utility model discloses a pressure-pressing machine cylinder. The system includes a main cylinder 1, which comprises a cylinder barrel 12, a front end cover 13, a rear end cover 14, a piston 15, and a piston rod. The front end cover 13 and the rear end cover 14 are respectively fixed to the axial ends of the cylinder barrel 12. A guide hole 131 is provided at the axial center of the front end cover 13. The piston 15 is coaxially fixed to the rear end of the piston rod. Both the front end cover 13 and the rear end cover 14 have radially penetrating air inlet holes 141 and air vent holes 142. A trigger relief rod 3 is provided on the side of the front end cover 13 facing the inside of the cylinder barrel 12. The trigger relief rod 3 is used to release the pressure at the front end of the piston 15 when the piston 15 moves to the front end of the cylinder barrel 12 and touches it, thereby achieving linkage with external devices. During operation... Compressed air is alternately introduced through the air inlets 141 of the rear end cover 14 and the front end cover 13. The piston 15 and piston rod are driven to move axially by the air pressure difference on both sides of the piston 15. When air enters through the air inlet 141 of the rear end cover 14 and exhausts through the air inlet 141 of the front end cover 13, the piston 15 moves forward to achieve the pushing action. Conversely, the piston 15 returns to its original position and triggers the pressure relief rod 3 installed on the side of the front end cover 13 facing the inside of the cylinder 12. Its function is to release the pressure at the front end of the piston 15 through its own action when the piston 15 moves to the front end of the cylinder 12 and contacts it, thereby converting the mechanical stroke signal of the cylinder into a pneumatic signal and realizing the coordinated action with the external linkage device.

[0023] A trigger chamber 132 is provided on the right side of the front cover 13. The trigger chamber 132 extends radially along the cylinder 12 and reaches the middle of the cylinder 12. A trigger port 1321 communicating with the inside of the cylinder 12 is provided at the tail end of the trigger chamber 132 near the middle of the cylinder 12. An air inlet 1322 communicating with the trigger chamber 132 is provided on the side of the front cover 13 facing the inside of the cylinder 12. The trigger chamber 132 is connected to the inside of the cylinder 12 through the air inlet 1322. The trigger chamber 132 on the right side of the front cover 13 is the intermediate channel for air pressure transmission and control. 2. Extending radially to the middle of the cylinder 12, the trigger chamber 132 forms a mechanical contact point with the inside of the cylinder 12 through the trigger port 1321 at the tail end, and at the same time establishes a gas pressure communication path with the inside of the cylinder 12 through the air inlet 1322. This allows the trigger chamber 132 to not only sense the position signal of the piston 15 in the middle of the cylinder 12, but also to introduce the gas pressure in the cylinder 12 into the subsequent air path under specific conditions, providing a basis for pressure storage and linkage control. The spatial layout of the trigger chamber 132 ensures that when the piston 15 moves to the middle of the cylinder 12, the subsequent gas pressure storage action can be triggered through mechanical contact.

[0024] A linkage trigger rod 2 is radially movable inside the trigger cavity 132. Several integrally formed limiting posts 1323 are provided inside the trigger cavity 132. The linkage trigger rod 2 is limited by the limiting posts 1323 to move radially only inside the trigger cavity 132. The head of the linkage trigger rod 2 is provided with an integrally formed contact 21, which protrudes outside the trigger port 1321. The head of the linkage trigger rod 2 extends into the trigger cavity 132 and is positioned inside the front cover 13, with a recessed arrangement. A square spring 17 is provided between the head of the linkage trigger rod 2 and the interior of the front cover 13. The square spring 17 applies inward pressure to the linkage trigger rod 2. The moving trigger rod 2 is constrained within the trigger chamber 132 by the limiting post 1323 and can only move radially. The contact head 21 of its head protrudes from the trigger port 1321 and is used to receive the mechanical thrust when the piston 15 moves to the middle of the cylinder 12. Under normal conditions, the square spring 17 applies inward pressure to the linkage trigger rod 2, causing its head to sink and simultaneously blocking the air inlet 1322 and the connecting port 134, cutting off the air pressure passage between the inside of the cylinder 12 and the trigger chamber 132 and the pressure storage chamber 133. This realizes the automatic closing and opening control of the air pressure passage, ensuring that the air pressure storage process is only triggered when the piston 15 moves to the middle of the cylinder 12.

[0025] A pressure storage chamber 133 is provided inside the front cover 13. The pressure storage chamber 133 is connected to the trigger chamber 132 through a connecting port 134. When the head of the linkage trigger rod 2 is at the bottom of the trigger chamber 132, the head of the linkage trigger rod 2 simultaneously blocks the air inlet 1322 and the connecting port 134. When compressed air is introduced into the air inlet 141 of the rear cover 14, it drives the piston 15 to move forward along the cylinder 12 axially. When the piston 15 moves to the middle of the cylinder 12, the piston 15 presses the contact 21 radially outward, causing the linkage trigger rod 2 to overcome the pressure of the square spring 17 and move radially outward along the trigger chamber 132. After the linkage trigger rod 2 moves radially outward, the air inlet 1322 opens and connects with the inside of the cylinder 12. The gas inside cylinder 12 is sequentially pumped into pressure storage chamber 133 through air inlet 1322, trigger chamber 132 and connecting port 134. Pressure storage chamber 133 provides temporary storage space for high-pressure gas. It forms a gas pressure transmission path with trigger chamber 132 through connecting port 134. When piston 15 moves to the middle of cylinder 12, piston 15 squeezes contact contact 21, causing linkage trigger rod 2 to move radially outward against the elastic force of square spring 17. At this time, air inlet 1322 and connecting port 134 open synchronously. High-pressure gas inside cylinder 12 flows into pressure storage chamber 133 sequentially through air inlet 1322, trigger chamber 132 and connecting port 134 and is stored, realizing the collection and storage of high-pressure gas in the middle of cylinder stroke.

[0026] A trigger relief rod 3 is axially mounted inside the pressure storage chamber 133. A return spring 31 is provided between the front of the trigger relief rod 3 and the front cover 13. The return spring 31 always applies a rearward force to the trigger relief rod 3. An airflow baffle 32 is integrally formed at the tail of the trigger relief rod 3. The trigger relief rod 3 is axially mounted inside the pressure storage chamber 133. The return spring 31 always applies a rearward force to it, keeping it in its initial position under normal conditions. At this time, the airflow baffle 32 at the tail is exactly opposite to the pressure relief port 135 of the pressure storage chamber 133, forming a blockage of the pressure relief port 135, ensuring that the gas in the pressure storage chamber 133 can be effectively stored. The structural design of the trigger relief rod 3 allows it to be pushed when the piston 15 moves to the end of its stroke, and it can also be automatically reset by the return spring 31, preparing for the next gas pressure storage and pressure relief cycle. The airflow baffle 32 at the tail controls the sealing and venting state of the pressure storage chamber 133 by cooperating with the pressure relief port 135.

[0027] The pressure storage chamber 133 has a pressure relief port 135 at a position corresponding to the airflow baffle 32. When the pressure relief rod 3 is not triggered, the pressure relief port 135 is positioned opposite the airflow baffle 32. A pressure relief interface 18 is provided at the pressure relief port 135, connecting the pressure relief port 135 to the outside of the front cover 13 directly above it. The pressure relief port 135 and the pressure relief interface 18 form a pressure output channel, which is normally blocked by the airflow baffle 32 triggered by the pressure relief rod 3, thus preserving the gas within the pressure storage chamber 133. When the piston 15 moves to the front end of the cylinder 12 and pushes the trigger pressure relief rod 3 forward, the airflow baffle 32 moves synchronously with the trigger pressure relief rod 3, the pressure relief port 135 is opened, and the high-pressure gas stored in the pressure storage chamber 133 is quickly discharged to the outside of the front cover 13 through the pressure relief port 135 and the pressure relief interface 18. The resulting air pressure signal drives the external linkage device to operate. This process uses the pre-stored high-pressure gas to achieve rapid pressure relief, improving the response speed of linkage with external devices.

[0028] Explanation of the pressure relief function of the vent hole 142 of the front cover 13: During the operation of this device, the vent hole 142 of the front cover 13 only undertakes the pressure relief function of a small part of the air pressure: When compressed air is introduced into the air inlet 141 of the rear cover 14 to drive the piston 15 to move forward along the cylinder 12 axially, a certain volume of gas will be generated at the front end of the piston 15. Only a small amount of this gas is discharged through the vent hole 142 of the front cover 13. Its function is only to assist the piston 15 in reducing the movement resistance and ensuring that the piston 15 can move forward smoothly. It is not the main pressure relief channel for driving the external linkage device. Most of the high-pressure gas at the front end of the piston 15 is still stored inside the cylinder 12. After the piston 15 moves to the middle of the cylinder 12 and triggers the linkage trigger rod 2, it will enter the pressure storage chamber 133 through the air inlet 1322 and the connecting port 134 of the trigger chamber 132 for storage, providing a sufficient high-pressure gas source for subsequent triggering of pressure relief.

[0029] Specific working principle and process: When compressed air is introduced into the air inlet 141 of the rear end cover 14, the piston 15 drives the piston rod to move forward along the cylinder 12 axially. At this time, the pressure at the rear end of the piston 15 is greater than the pressure at the front end. When the piston 15 moves to the middle of the cylinder 12, it will radially and outwardly press the contact 21 of the linkage trigger rod 2, causing the linkage trigger rod 2 to overcome the force of the square spring 17 and move radially outward, opening the air inlet 1322 and the connecting port 134. The gas inside the cylinder 12 enters and is stored in the pressure storage chamber through the air inlet 1322, the trigger chamber 132 and the connecting port 134 in sequence. Inside 133; when the piston 15 continues to move forward to the front end of the cylinder 12, it will push the trigger relief rod 3 to move axially against the force of the reset spring 31. At this time, the linkage trigger rod 2 is reset under the action of the square spring 17, and its head blocks the air inlet 1322 and the connecting port 134 again, so that the pressure storage chamber 133 is disconnected from the inside of the cylinder 12. As the trigger relief rod 3 moves, the airflow baffle 32 at its tail leaves the relief port 135, and the pressurized gas stored in the pressure storage chamber 133 is quickly discharged through the relief port 135 and the relief interface 18, driving the external linkage device to operate.

[0030] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A pusher cylinder for a buckle press, comprising a main cylinder (1), characterized in that: The main cylinder (1) includes a cylinder (12), a front end cover (13), a rear end cover (14), a piston (15), and a piston rod (15). The front end cover (13) and the rear end cover (14) are respectively fixed to the two ends of the cylinder (12) along the axial direction. A guide hole (131) is provided at the center of the front end cover (13). The piston (15) is coaxially fixed to the rear end of the piston rod (15). Both the front end cover (13) and the rear end cover (14) are provided with a radially penetrating air inlet (141) and an air outlet (142). A trigger pressure relief rod (3) is provided on the side of the front end cover (13) facing the inside of the cylinder (12). The trigger pressure relief rod (3) is used to release the pressure at the front end of the piston (15) when the piston (15) moves to the front end of the cylinder (12) and touches it, so as to realize the linkage with the external device.

2. The push cylinder of a presser foot machine according to claim 1, characterized in that: A trigger chamber (132) is provided on the right side of the front cover (13). The trigger chamber (132) extends radially along the cylinder (12) and extends to the middle of the cylinder (12). A trigger port (1321) communicating with the inside of the cylinder (12) is provided at the end of the trigger chamber (132) near the middle of the cylinder (12). An air inlet (1322) communicating with the trigger chamber (132) is provided on the side of the front cover (13) facing the inside of the cylinder (12). The trigger chamber (132) is connected to the inside of the cylinder (12) through the air inlet (1322).

3. A push cylinder for a presser foot machine as defined in claim 2, characterized in that: The trigger cavity (132) is radially movable with a linkage trigger rod (2). The trigger cavity (132) is provided with several integrally formed limiting posts (1323). The linkage trigger rod (2) is limited by the limiting posts (1323) to move radially within the trigger cavity (132). The head of the linkage trigger rod (2) is provided with an integrally formed contact (21). The contact (21) protrudes outside the trigger port (1321). The head of the linkage trigger rod (2) extends to the trigger cavity (132) and is located inside the front cover (13) and is recessed. A square spring (17) is provided between the head of the linkage trigger rod (2) and the inside of the front cover (13). The square spring (17) applies inward pressure to the linkage trigger rod (2).

4. The push cylinder of claim 3, wherein: The front end cover (13) has a pressure storage chamber (133) inside. The pressure storage chamber (133) is connected to the trigger chamber (132) through a connecting port (134). When the head of the linkage trigger rod (2) is at the bottom of the trigger chamber (132), the head of the linkage trigger rod (2) simultaneously blocks the air inlet (1322) and the connecting port (134). When compressed air is introduced into the air inlet (141) of the rear end cover (14), the piston (15) is driven to move forward along the cylinder (12) axially. (15) When the piston (15) moves to the middle of the cylinder (12), it will press the contact (21) radially outward, so that the linkage trigger rod (2) overcomes the pressure of the square spring (17) and moves radially outward along the trigger chamber (132). After the linkage trigger rod (2) moves radially outward, the air inlet (1322) opens and communicates with the inside of the cylinder (12). The gas inside the cylinder (12) is successively pumped into the pressure storage chamber (133) through the air inlet (1322), the trigger chamber (132) and the communication port (134).

5. A push cylinder for a presser foot machine as defined in claim 4, characterized in that: A trigger pressure relief rod (3) is axially mounted inside the pressure storage chamber (133). A reset spring (31) is provided between the front of the trigger pressure relief rod (3) and the front end cover (13). The reset spring (31) always applies a rearward force to the trigger pressure relief rod (3). An airflow baffle (32) is integrally formed at the tail of the trigger pressure relief rod (3).

6. A push cylinder for a presser foot machine according to claim 5, characterized in that: The pressure storage chamber (133) has a pressure relief port (135) at a position corresponding to the airflow baffle (32), and the pressure relief port (135) is positioned opposite to the airflow baffle (32) when the pressure relief rod (3) is not triggered. The pressure relief port (135) is provided with a pressure relief interface (18), and the pressure relief port (135) is connected to the outside of the front cover (13) directly above it through the pressure relief interface (18).

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