Punching knife assembly and cutting machine

Abstract

The utility model relates to the field of leather cutting, in particular to a stamping knife assembly and a cutting machine, the stamping knife assembly comprises a knife holder, a punching mechanism and a cutting mechanism, the punching mechanism and the cutting mechanism are arranged on the knife holder, a knife bar internally communicated with a negative pressure pipe is arranged in the punching mechanism, and the tail end of the knife bar is a punching section penetrating through leather. A material collecting opening formed in the punching section is communicated with the interior of the cutter bar and used for collecting waste materials generated when leather is punched, a vent hole is formed in the area, close to the punching section, of the cutter bar, and the vent hole and the negative pressure pipe form a gas flow channel for driving the waste materials to flow. The through structure selected in the cutter bar is used for meeting the basic requirement for being communicated with a negative pressure pipe, after it is confirmed that the cutter bar sinks into the punching section in leather, a vent hole is formed in the area, close to the punching section, of the cutter bar, and the vent hole provides external air for the interior of the cutter bar; a gas flow channel for collecting waste materials is formed through cooperation with negative pressure in the negative pressure pipe, and under the action of the gas flow channel, the waste materials in the punching section are sucked away, so that diffusion of the waste materials to the periphery is controlled.

Description

Technical Field

[0001] This utility model relates to the field of leather cutting, and more particularly to a punch assembly and a cutting machine. Background Technology

[0002] Cutting machine blades are widely used in various mechanical cutting fields, primarily for cutting items of different materials, including paper, plastics, metals, and fabrics. In industrial production, the cutting machine blade is a key working component, and its performance directly affects cutting efficiency and quality. Therefore, designing and manufacturing high-performance cutting machine blades has become a continuous pursuit across all industries.

[0003] In the leather material cutting industry, the punching mechanism in the cutting equipment adopts a side discharge punch. The rear end of the punch is milled with an arc-shaped side discharge port. The punch blade is equipped with a collection port that connects to the inside. The debris punched out of the collection port is continuously squeezed and pushed towards the side discharge port. Then, the centrifugal force generated by the high-speed rotation of the punch throws the debris overflowing into the side discharge port out.

[0004] In practical applications, when dealing with materials of different properties, especially those with elasticity, the waste material produced by this type of punch is prone to come into contact with the inner wall of the punch, resulting in common problems such as material blockage, scraping, failure to punch through, and material not being carried away.

[0005] A more common problem is that, because the punch (such as the leather punch with patent number CN01238687.1) passes through the side discharge port, the waste generated from punching is scattered on the surface of the processed material. As the number of punches increases, the generated debris gradually accumulates on the material surface, requiring the punching to be stopped and the material to be collected manually. In addition, because the generated punching waste is small in size and large in quantity, a lot of time needs to be spent cleaning up the punching waste, which reduces the working efficiency of the entire machine. Utility Model Content

[0006] To solve the above problems, this utility model provides a punch assembly and a cutting machine, which uses a negative pressure material collection method to control the problem of waste spreading in all directions.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a punching assembly, comprising a knife holder and a punching mechanism and a cutting mechanism disposed on the knife holder, characterized in that the punching mechanism has a knife bar that is internally connected to a negative pressure pipe, the end of the knife bar is a punching section that passes through the leather, a material collection port provided on the punching section is connected to the interior of the knife bar for collecting waste material generated when the leather is punched, and a vent is formed in the area of ​​the knife bar near the punching section, forming a gas flow channel with the negative pressure pipe to drive the waste material flow.

[0008] The beneficial effects of this utility model are:

[0009] The hollow structure inside the blade holder is chosen to meet the basic requirement of connecting with the negative pressure pipe. After confirming that the blade holder is embedded in the punched section of the leather (leather includes not only single layers but also multiple layers), a vent is provided in the area of ​​the blade holder near the punched section. The vent provides outside air to the inside of the blade holder, which, together with the negative pressure in the negative pressure pipe, forms a gas flow channel for collecting waste. Under the action of the gas flow channel, the waste in the punched section is sucked up and removed, thereby controlling the spread of waste to the surroundings.

[0010] The area of ​​the cutter bar near the punching section is a step, and the vent is located on the step. Specifically, the vent is set on the surface of the step facing the leather. The above solution is adopted to ensure that the gas flow channel is closer to the punching section, which has a better effect on suppressing the spread of waste in all directions.

[0011] Specifically, the lower part of the knife bar is composed of a punch, a connecting shank, and a nut. The nut is fitted onto the punch and threadedly connected to the connecting shank. The cutting edge of the punch forms the edge of the material collection port. After a certain number of uses, the cutting edge will become rough. The above structure allows the punch to be easily removed for easy replacement.

[0012] In addition, this modular punch assembly is easier to manufacture, especially in terms of depth, and the modular assembly reduces the difficulty of production.

[0013] It should be noted that there are three vents, the purpose of which is to further increase the air volume and form a larger airflow in the handle, thereby improving the adsorption efficiency.

[0014] The tool holder also includes a punch shank and a punch cap. The end of the punch shank is a spreading area connected to the connecting handle. The spreading area is embedded in the end of the punch shank and expands outwards. The punch cap is fitted onto the spreading area, and the punch cap and the spreading area are connected by threads. Thus, the connecting handle is fixed inside the punch shank. It is not difficult to see that this fastening method uses the hardness of the material itself to form the first locking method for the connecting handle. The threaded connection between the punch cap and the spreading area further restricts the spreading area to shrink towards the connecting handle, forming a second locking method. Combined with the first locking method, this ensures that the connecting handle will not loosen inside the punch shank, resulting in a more stable connection.

[0015] During punching, the cutting bar rotates. Specifically, the cutting holder is equipped with a rotary motor and a timing sleeve. Part of the timing sleeve is embedded in the cutting holder, while the gear part of the timing sleeve is located outside the cutting holder. The timing sleeve is rotatable inside the cutting holder. The rotary motor drives the timing sleeve to rotate inside the cutting holder via a belt. The cutting bar is located inside the timing sleeve and rotates along with the rotation of the timing sleeve. This rotating cutting action provides a more uniform cutting force, making it easier to process thicker leather. At the same time, the edge of the material collection port will be cut at multiple angles and directions, avoiding excessive wear in one direction.

[0016] The mechanism that performs the punching action of the cutting bar is a punching cylinder. The punching cylinder includes a piston rod and a cavity set in the cutting bar holder. The cavity is connected to an air source. Under the action of the air source, the piston rod is controlled to move longitudinally. Both ends of the piston rod are located outside the cutting bar holder. Throughout the entire movement process, both ends of the piston rod are always outside the cutting bar holder. The two ends of the piston rod include an upper end and a lower end. The upper end forms a pressure plate that is connected to the upper end of the cutting bar. The pressure plate extends to the upper end of the cutting bar and is connected to the upper end of the cutting bar holder. The lower end of the piston rod is connected to a presser foot that extends below the cutting bar holder and has an opening for the cutting bar holder to pass through. The presser foot is designed to flatten the perimeter of the punching area to ensure that the leather does not wrinkle during punching.

[0017] It should be noted that a bearing is provided in the area of ​​the pressure plate corresponding to the punch bar. The upper end of the punch bar is positioned inside the pressure plate and abuts against the bearing. In this way, the rotation of the punch bar and the pressure applied by the pressure plate to the punch bar will not interfere with each other and will not affect their movement.

[0018] It also includes a return spring, which is used to adjust the position of the punch bar. A punch cap is fitted on the upper end of the punch bar, and the return spring is fitted on the punch bar, with one end abutting against the punch cap and the other end abutting against the inner surface of the synchronizing sleeve.

[0019] A cutting machine comprising all the components of the aforementioned punch assembly. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention.

[0021] Figure 2 yes Figure 1 A stereoscopic view from another perspective.

[0022] Figure 3 yes Figure 2 Enlarged diagram of point A.

[0023] Figure 4 It is a 3D diagram of the tool holder.

[0024] Figure 5 yes Figure 4 Enlarged diagram of point B.

[0025] Figure 6 yes Figure 4 An explosion diagram.

[0026] Figure 7 yes Figure 6 Enlarged diagram of point C.

[0027] Figure 8 This is a 3D view of the synchronization sleeve.

[0028] Figure 9 This is a diagram showing the connection between the piston rod and the presser foot. Detailed Implementation

[0029] Please see Figure 1-9 As shown, a cutting machine includes a punch assembly, which includes a knife holder 1, a punching mechanism 2 and a cutting mechanism disposed on the knife holder 1. The punching mechanism 2 has a knife bar that is internally connected to a negative pressure pipe 3. The end of the knife bar is a punching section 2a that passes through the leather. A material collection port 2b provided on the punching section 2a is connected to the interior of the knife bar for collecting waste generated when the leather is punched. A vent hole 2c is formed in the area of ​​the knife bar near the punching section 2a, forming a gas flow channel with the negative pressure pipe 3 to drive the waste flow.

[0030] The beneficial effects of this utility model are:

[0031] The hollow structure inside the blade bar is chosen to meet the basic requirement of connecting with the negative pressure pipe 3. After confirming that the blade bar is embedded in the perforated section 2a of the leather (the leather includes not only single layer but also multiple layers), a vent 2c is provided in the area of ​​the blade bar near the perforated section 2a. The vent 2c provides outside air to the inside of the blade bar. Together with the negative pressure in the negative pressure pipe 3, a gas flow channel for collecting waste is formed. Under the action of the gas flow channel, the waste in the perforated section 2a is sucked up and removed, thereby controlling the diffusion of waste to the surroundings.

[0032] The area of ​​the cutter bar near the punching section 2a is a step 2a-1, and the vent 2c is located on the step 2a-1. Specifically, the vent 2c is set on the surface of the step 2a-1 facing the leather. The above scheme is adopted to ensure that the gas flow channel is closer to the punching section 2a, and the effect of suppressing the spread of waste in all directions is better.

[0033] Specifically, the lower part of the knife bar is composed of a punch 21, a connecting shank 22 and a nut 23. The nut 23 is fitted onto the punch 21 and threadedly connected to the connecting shank 22. The cutting edge of the punch 21 is the edge that forms the material collection port 2b. After a certain number of uses, the cutting edge will become rough. The above structure allows the punch 21 to be easily removed for easy replacement.

[0034] In addition, this modular punch 21 assembly is easier to process in production, especially in terms of depth. The separate assembly relationship reduces the difficulty of production.

[0035] It should be noted that there are three vent holes 2c, the purpose of which is to further increase the air volume and form a larger airflow in the connecting handle 22, thereby improving the adsorption efficiency.

[0036] The tool holder also includes a punch shank 24 and a punch cap 25. The end of the punch shank 24 is a spreading area connected to the connecting handle 22. The spreading area is embedded in the end of the punch shank 24 and spreads outwards. The punch cap 25 is fitted onto the spreading area. The punch cap 25 and the spreading area 24-1 are threaded together, thereby fixing the connecting handle 22 inside the punch shank 24. It is not difficult to see that this fastening method uses the hardness of the material itself to form the first locking method for the connecting handle 22. The threaded connection between the punch cap 25 and the spreading area 24-1 further restricts the spreading area 24-1 to shrink towards the connecting handle 22, forming a second locking method. Combined with the first locking method, the connecting handle 22 will not loosen inside the punch shank 24, and the connection effect is more stable.

[0037] The support area 24-1 is formed by providing multiple slots 24-2 at the end of the punch bar 24. This setting method is easy to produce and does not require the use of additional parts.

[0038] During punching, the cutter bar rotates. Specifically, the cutter holder 1 is equipped with a rotary motor 26 and a synchronous sleeve 27. Part of the synchronous sleeve 27 is embedded in the cutter holder 1, while the gear part 27-1 on the synchronous sleeve 27 is located outside the cutter holder 1. The synchronous sleeve 27 is rotatable within the cutter holder 1. The rotary motor 26 drives the synchronous sleeve 27 to rotate within the cutter holder 1 via a belt. The cutter bar is located within the synchronous sleeve 27 and rotates along with the synchronous sleeve 27. This rotating cutting action provides a more uniform cutting force, making it easier to process thicker leather. At the same time, the edge of the material collection port 2b will cut at multiple angles and directions, avoiding excessive wear in one direction.

[0039] The mechanism for performing the punching action of the cutting bar is a punching cylinder. The punching cylinder includes a piston rod 28 and a cavity set in the cutting bar holder 1. The cavity is connected to an air source. Under the action of the air source, the piston rod 28 is controlled to move longitudinally. Both ends of the piston rod 28 are located outside the cutting bar holder 1. Throughout the entire movement process, both ends of the piston rod 28 are always outside the cutting bar holder 1. Both ends of the piston rod 28 include an upper end and a lower end. The upper end forms a pressure plate 28-1 connected to it. The pressure plate 28-1 extends to the upper end of the cutting bar and is connected to the upper end of the cutting bar. The lower end of the piston rod 28 is connected to a presser foot 30. The presser foot 30 extends below the cutting bar and has an opening for the cutting bar to pass through. The purpose of setting the presser foot 30 is to flatten the periphery of the punching area to ensure that the leather does not wrinkle during punching.

[0040] It should be noted that a bearing is provided in the area of ​​the pressure plate 28-1 corresponding to the punch bar 24. The upper end of the punch bar 24 is positioned inside the pressure plate 28-1 and abuts against the bearing. In this way, the rotation of the punch bar 24 and the pressure applied by the pressure plate 28-1 to the punch bar 24 will not interfere with each other and will not affect their movement.

[0041] It also includes a return spring 29, which is used to adjust the position of the punch bar 24. A punch cap 24-3 is fitted on the upper end of the punch bar 24. The return spring 29 is fitted on the punch bar 24, with one end abutting against the punch cap 24-3 and the other end abutting against the inner surface of the synchronizing sleeve 27.

[0042] The cutting mechanism is existing technology, and its structure will not be described in detail.

[0043] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A punching assembly, comprising a knife holder and a punching mechanism and a cutting mechanism disposed on the knife holder, the punching mechanism having a knife bar internally connected to a negative pressure pipe, the end of the knife bar being a punching section that passes through leather, a material collection port provided on the punching section being connected to the interior of the knife bar for collecting waste material generated during the punching of the leather, and a vent hole being formed in the area of ​​the knife bar near the punching section, forming a gas flow channel with the negative pressure pipe to drive the waste material flow.

2. The punch assembly according to claim 1, characterized in that, The area of ​​the blade near the punching section is a step, and the vent is located on the step, with the vent set on the side of the step facing the leather.

3. A punch assembly according to claim 2, characterized in that, The lower part of the knife holder is composed of a punch, a connecting shank, and a nut. The nut is fitted onto the punch and threadedly connected to the connecting shank. The cutting edge of the punch forms the edge of the material collection port.

4. A punch assembly according to claim 1, characterized in that, There are three vent holes; the knife bar also includes a punch knife bar and a punch cap. The end of the punch knife bar is a spreading area connected to the connecting handle. The spreading area is embedded in the end of the punch knife bar and spreads out in all directions. The punch cap is fitted on the spreading area and the punch cap and the spreading area are threaded together.

5. A punch assembly according to claim 4, characterized in that, The tool holder is equipped with a rotary motor and a timing sleeve. Part of the timing sleeve is embedded in the tool holder, while the gear part on the timing sleeve is located outside the tool holder. The timing sleeve is rotatable inside the tool holder. The rotary motor drives the timing sleeve to rotate inside the tool holder via a belt. The tool bar is located inside the timing sleeve and rotates along with the rotation of the timing sleeve.

6. A punch assembly according to claim 1, characterized in that, It also includes a stamping cylinder as a mechanism for performing the stamping action of the tool holder. The stamping cylinder includes a piston rod and a cavity set in the tool holder. The cavity is connected to an air source. The two ends of the piston rod are located outside the tool holder. The two ends of the piston rod include an upper end and a lower end. The upper end forms a pressure plate that is connected to it. The pressure plate extends to the upper end of the tool holder and is connected to the upper end of the tool holder. The lower end of the piston rod is connected to a pressure foot that extends to the bottom of the tool holder and has an opening for the tool holder to pass through.

7. A punch assembly according to claim 6, characterized in that, The pressure plate has a bearing in the area corresponding to the punch bar, and the upper end of the punch bar is positioned inside the pressure plate and abuts against the bearing.

8. A punch assembly according to claim 5, characterized in that, It also includes a return spring, which is used to adjust the position of the punch bar. A punch cap is fitted on the upper end of the punch bar, and the return spring is fitted on the punch bar, with one end abutting against the punch cap and the other end abutting against the inner surface of the synchronizing sleeve.

9. A punch assembly according to claim 4, characterized in that, The support area is formed by multiple slots at the end of the punch shank. This design is easy to manufacture and does not require additional parts.

10. A cutting machine, characterized in that, A punch assembly comprising any one of claims 1-9.

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