Gun needle lifting mechanism and nail gun

Abstract

The invention discloses a gun needle lifting mechanism and a nail gun, belongs to the technology of nailing tools, and aims to solve the problems of excessive abrasion, jamming and damage to a lifting component and a gun needle caused by position deviation of matching of the lifting component and the gun needle of the existing nail gun. The movable part is configured to be converted from the first position to the second position along with rotation of the lifting wheel so as to adjust the lifting part to be accurately meshed with the teeth, and therefore no matter whether deviation exists between the position of the gun needle and the position of the lifting wheel after nailing, the lifting wheel and the gun needle can be kept accurately matched, and the accuracy of nailing is improved. And the defects of excessive abrasion, jamming, damage to the lifting wheel and the gun needle and the like of the meshing part of the lifting wheel and the gun needle are overcome. According to the nailing device, the elastic element is arranged, the elastic element acts on the movable part to promote the movable part to reset from the second position to the first position, so that the movable part can be reset after each time of nailing, and the lifting wheel and the gun pin can be kept in precise fit when the lifting wheel lifts the gun pin each time.

Description

Technical Field

[0001] The invention belongs to the technology of nailing tools. The nailing tools are used to nail nails into positions such as wooden boards and walls, and specifically relate to a gun needle lifting mechanism and a nail gun. Background Art

[0002] The electric nail guns on the market that are used to drive nails into wooden boards, walls, etc., use gas springs as the power source. When nailing, the motor relies on electricity (such as replaceable batteries) to drive the lifting component, which lifts the gun needle and compresses the gas spring. The lifting component lifts the gun needle to a preset position and then releases the gun needle. The gun needle moves to nail with the elastic force of the gas spring. The motor continues to rotate, and the gun needle will be lifted and nailed one by one.

[0003] This type of nail gun requires that the lifting component and the gun needle maintain precise cooperation when lifting the gun needle, such as the first engaging portion and the second engaging portion in the invention patent application with application publication number CN113490574A, the non-full-circumference gear and rack-type gun needle in the invention patent application with application publication number CN113070849A, and the meshing cylinder and meshing teeth in the invention patent application with application publication number CN110253503A. When there is a position deviation in the cooperation between the lifting component and the gun needle, such as when the position of the gun needle (striker) is offset after nailing, it is easy to cause defects such as excessive wear, jamming, and damage to the lifting component and the gun needle (striker). Summary of the invention

[0004] The technical problem to be solved and the technical task proposed by the present invention is to overcome the defects of the existing nail gun such as excessive wear, jamming, damage to the lifting component and the gun needle (striker) caused by position deviation in the cooperation between the lifting component and the gun needle, and to provide a gun needle lifting mechanism and a nail gun to ensure that the lifting component and the gun needle can maintain precise cooperation regardless of whether there is a deviation in the position of the gun needle and the lifting component after nailing.

[0005] In order to achieve the above-mentioned object, the gun needle lifting mechanism of the present invention comprises:

[0006] A gun needle having a plurality of teeth distributed along its length;

[0007] The lifting wheel has a circumference including a first angle range and a second angle range, wherein a plurality of lifting parts are distributed in the first angle range so that when the lifting wheel rotates to the teeth corresponding to the first angle range, the lifting parts are engaged with the teeth to lift the gun needle, and no lifting parts are distributed in the second angle range so that when the lifting wheel rotates to the teeth corresponding to the second angle range, the lifting parts are disengaged from the teeth to release the gun needle;

[0008] A movable member, which is movably mounted on the lifting wheel and is configured to change from a first position to a second position as the lifting wheel rotates to adjust the lifting portion to accurately mesh with the teeth;

[0009] The elastic element acts on the movable member to cause the movable member to return from the second position to the first position.

[0010] The gun needle lifting mechanism is configured with a movable part on the lifting wheel, and the movable part is configured to change from a first position to a second position as the lifting wheel rotates to adjust the lifting part to accurately mesh with the teeth. Accordingly, no matter whether there is a deviation between the position of the gun needle and the lifting wheel after nailing, the lifting wheel and the gun needle can maintain accurate matching, delaying defects such as excessive wear, jamming and damage to the lifting wheel and the gun needle at the meshing position of the lifting wheel and the gun needle.

[0011] The gun needle lifting mechanism is provided with an elastic element, so that the elastic element acts on the movable part to cause the movable part to reset from the second position to the first position, so that the movable part can be reset after each nailing, so that the lifting wheel and the gun needle can maintain accurate cooperation each time the lifting wheel lifts the gun needle.

[0012] The gun needle lifting mechanism is only provided with movable parts on the lifting wheel, and the diameter of the lifting wheel is not substantially increased, so that the gun needle lifting mechanism maintains a compact structure.

[0013] In order to simplify the structure, the movable part adjusts the lifting part to accurately mesh with the teeth by changing the teeth of the gun needle from the first position to the second position, thereby avoiding the need to configure a separate structure for the movable part to prompt the movable part to change from the first position to the second position and avoiding the complexity of the structure. Such an effect is achieved by the following structure:

[0014] The movable part is movably assembled on the lifting wheel near the starting end of the first angle range, and the starting end is the end of the first angle range that first passes through the lifting part and meshes with the teeth when the lifting wheel rotates to lift the gun needle. The movable part has a force-bearing part and a meshing part.

[0015] The force-bearing part and the meshing part are configured as follows: when the movable part is in the first position, the force-bearing part is in the resisting position, and the meshing part deviates from the meshing position; when the movable part rotates with the lifting wheel, the force-bearing part is resisted by the teeth and overcomes the elastic force of the elastic element to make the movable part move from the first position to the second position, and when the movable part is in the second position, the force-bearing part deviates from the resisting position, and the meshing part is in the meshing position and is in a sequence of meshing with the teeth together with the lifting part.

[0016] Accordingly, after each nailing, regardless of whether there is a deviation between the positions of the gun needle and the lifting wheel, as the lifting wheel rotates, the force-bearing part can always be resisted by the teeth and overcome the elastic force of the elastic element to move the movable part from the first position to the second position, so that the force-bearing part deviates from the resisting position, and the meshing part is located at the meshing position and is in a sequence of meshing with the teeth together with the lifting part. Since the movable part is located on the lifting wheel near the starting end of the first angle range, the lifting part is placed in a sequence of meshing with the teeth by the meshing part first meshing with the teeth.

[0017] In particular, in order to ensure that any lifting portion can engage with any tooth to lift the gun needle, the pitches of the several teeth distributed on the gun needle are equal, the pitch is the distance between any two adjacent teeth, the spacing between any two adjacent lifting portions is equal, the spacing between the lifting portions is the angular distance between any two adjacent lifting portions, and when the meshing portion is in the meshing position and is in the sequence of meshing with the teeth together with the lifting portion, the angular distance between the meshing portion and the adjacent lifting portion is equal to the spacing between the lifting portions, that is, the sequence of meshing with the teeth is continuous, so that the meshing portion is like a lifting portion and is located at the revealed position of this sequence.

[0018] Preferably, the lifting portion is a pin assembled on the lifting wheel, which is convenient for processing and saving manufacturing costs, and is also conducive to lubrication and replacement of the pin shaft.

[0019] In order to make the pin force even and not easy to deform, the lifting wheel includes two spaced walls, a gap is formed between the two spaced walls, the two ends of the lifting part are assembled on the two spaced walls, and the middle part of the lifting part is located in the gap. In this structure, the two ends of the pin are subjected to force, and the middle part is subjected to force when the gun needle is lifted, so that the pin is not deformed. In particular, when the lifting part is engaged with the teeth to lift the gun needle, the two spaced walls constrain and guide the gun needle into the gap, which has a supporting effect on the gun needle and prevents the gun needle from swinging.

[0020] In order to prevent the pin from always contacting the teeth of the gun nail at one position and causing local wear, the pin is movably mounted on the lifting wheel, and the end surface of the lifting wheel is covered with a cover plate, which constrains the pin to the lifting wheel. Accordingly, when the gun needle is lifted through the engagement of the pin and the teeth, the pin can move to change the position where the pin contacts the teeth, and it is also convenient to fully lubricate the pin.

[0021] In order to increase the acceptance balance of the movable part and avoid the acceptance deviation when the movable part contacts the gun needle, the movable part distribution shaft is swingably assembled in the gap.

[0022] The structure in which the elastic element acts on the movable part can take many forms:

[0023] In one embodiment, an arc-shaped through hole is provided on the lifting wheel, a rod is passed through the arc-shaped through hole, and the elastic element acts on the rod so that the rod applies elastic force to the movable part. Under the guidance of the arc-shaped through hole, the rod can move along a preset track to constrain the movable part within a certain range of movement. In particular, the elastic element includes a first torsion spring and a second torsion spring, and the first torsion spring and the second torsion spring are separately located at both ends of the lifting wheel and act on both ends of the rod respectively, so that the rod can be evenly stressed and a uniform elastic force can be applied to the movable part.

[0024] In another embodiment, the elastic element is a tension spring, and two ends of the tension spring are respectively connected to the lifting wheel and the movable part.

[0025] In the third embodiment, the elastic element is a compression spring, and two ends of the compression spring are respectively supported on the lifting wheel and the movable part.

[0026] When the elastic element is a tension spring and a compression spring, the structure is simple and the number of parts is small.

[0027] In order to avoid the lifting wheel profile from causing an obstruction to the gun needle when the lifting wheel rotates to the teeth corresponding to the second angle range, the edge of the lifting wheel in the second angle range is concave.

[0028] To achieve the above object, the nail gun of the present invention comprises:

[0029] The gun needle lifting mechanism of the present invention;

[0030] A motor for driving the lifting wheel to rotate;

[0031] A cylinder, a piston is arranged in the cylinder, a gun needle is connected to the piston and extends downward, and a gas spring is arranged on the upper side of the piston for pushing the piston to move downward;

[0032] The nail magazine is used to store nails and transport the stored nails to the lower end position of the gun needle.

[0033] Accordingly, when the nail gun is working, the motor drives the lifting wheel to rotate to lift the gun needle. As the motor rotates continuously, the gun needle is repeatedly lifted and lowered for nailing. Regardless of whether there is a deviation between the position of the gun needle and the lifting wheel after nailing, the lifting wheel and the gun needle can maintain precise coordination, delaying defects such as excessive wear, jamming, and damage to the lifting wheel and the gun needle at the meshing part of the lifting wheel and the gun needle.

[0034] In order to apply elastic force to the needle after the needle is lifted to drive nails, the gas spring can have different structural forms:

[0035] In one embodiment, a sealed cavity is formed on the upper side of the piston, and a permanently compressed gas is sealed in the sealed cavity to form a gas spring. The gas spring of this structural form always maintains elastic force, and nailing can be directly performed whenever the nail gun is started.

[0036] In another embodiment, the nail gun includes an air pump; a sealed cavity is formed on the upper side of the piston, and the sealed cavity has an exhaust port; compressed air is filled into the sealed cavity through the air pump to form a gas spring, and the compressed air in the sealed cavity is released through the exhaust port to eliminate the gas spring. The gas spring of this structural form can release the compressed air when the nail gun is not in use, thereby extending the life of the sealing structure of the sealed cavity and avoiding the safety hazards of the gas spring. Each time the nail gun is used, the air pump is used to inflate the gas spring to achieve the required pressure, and the required pressure of the gas spring can be adjusted according to demand.

[0037] In order to simplify the structure, the motor is configured to rotate in both directions. The motor drives the lifting wheel to rotate through the first transmission device, and the motor drives the air pump through the second transmission device. The first transmission device and the second transmission device are configured so that when the motor rotates in any direction, one of the lifting wheel and the air pump is driven and the other is disengaged from the driving. Accordingly, the lifting wheel and the air pump are driven by one motor, and the driving of the lifting wheel and the air pump does not interfere with each other.

[0038] The present invention arranges a movable part on the lifting wheel, and the movable part is arranged to change from a first position to a second position as the lifting wheel rotates to adjust the lifting part to accurately mesh with the teeth. Accordingly, no matter whether there is a deviation between the position of the gun needle and the lifting wheel after nailing, the lifting wheel and the gun needle can maintain accurate matching, delaying defects such as excessive wear, jamming and damage to the lifting wheel and the gun needle at the meshing part of the lifting wheel and the gun needle.

[0039] The present invention configures an elastic element to make the elastic element act on the movable part to reset the movable part from the second position to the first position, so that the movable part can be reset after each nailing, so that the lifting wheel and the gun needle can maintain accurate cooperation each time the lifting wheel lifts the gun needle.

[0040] The present invention basically does not increase the diameter of the lifting wheel by configuring the movable part on the lifting wheel, thereby keeping the gun needle lifting mechanism compact in structure.

[0041] The invention realizes driving of the lifting wheel and the air pump by one motor, and the driving of the lifting wheel and the air pump do not interfere with each other, thus simplifying the structure of the nail gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is an isometric view of a nail gun of the present invention;

[0043] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of the nail gun shown;

[0044] Figure 3 for Figure 2 AA section view, in which the gun needle is lifted to a high position by the lifting wheel;

[0045] Figure 4 for Figure 3 An enlarged view of the lifting wheel and the gun needle;

[0046] Figure 5 for Figure 4 A schematic diagram of the lifting wheel releasing the gun needle so that the gun needle descends from a high position to nail;

[0047] Figure 6 for Figure 5 Schematic diagram of the gun needle dropping to the lowest position for nailing;

[0048] Figure 7 for Figure 6 A schematic diagram showing that when the lifting wheel continues to rotate, the force-bearing portion of the movable member is blocked by the teeth, causing the movable member to move from the first position to the second position;

[0049] Figure 8 for Figure 7 A schematic diagram of the movable member in the gun moving to the second position so that the meshing portion is located at the meshing position and meshes with the teeth on the gun needle;

[0050] Fig. 9 It is a schematic diagram of the gun needle not falling to the lowest position after nailing and being adjusted by the movable part so that the lifting part and the teeth are accurately engaged;

[0051] Fig.10 A schematic diagram of a lifting wheel of a structure of the present invention;

[0052] Fig.11 for Fig.10 A schematic diagram from another perspective;

[0053] Fig.12 for Fig.10 The structural exploded diagram of the lifting wheel shown;

[0054] Fig.13 for Fig.12 A schematic diagram showing another perspective of the structure of the lifting wheel;

[0055] Fig.14 A schematic diagram of a lifting wheel of another structure of the present invention;

[0056] Fig.15 is a schematic diagram of a lifting wheel of a third structure of the present invention;

[0057] Fig.16 It is a schematic diagram of the assembly structure of the driving device, air pump and air cylinder of the present invention;

[0058] Fig.17 A schematic diagram of a drive device driving a gun needle lifting mechanism;

[0059] Description of the numbers in the figure:

[0060] 100 Gun needle lifting mechanism:

[0061] 110 needle, 111 teeth, S pitch,

[0062] 120 lifting wheel, 121 lifting part, 122 wall, 123 gap, 124 cover plate, 125 arc-shaped through hole, 126 rod, α first angle range, β second angle range, δ spacing between lifting parts, θ angular distance between the meshing part and the adjacent lifting part,

[0063] 130 movable part, 131 force-bearing part, 132 meshing part, 133 pin shaft,

[0064] 141 a first torsion spring, 142 a second torsion spring, 143 a tension spring, 144 a compression spring;

[0065] 200 driving device: 210 motor, 220 first transmission device, 230 second transmission device;

[0066] 300 cylinder: 301 piston, 302 sealing chamber, 303 exhaust port;

[0067] 400 nail box, 401 nails;

[0068] 500 air pump;

[0069] 600 handle, 601 power supply, 602 nailing switch. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.

[0072] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "clockwise", "counterclockwise" and the like indicate positions, positional relationships and directions based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Among them, "upper" and "lower", "left" and "right", "front" and "back", and "clockwise" and "counterclockwise" are opposite directions.

[0073] In the description of the present invention, it is necessary to understand that the technical features defined by the terms "first", "second" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present invention.

[0074] The present invention is described in detail below in conjunction with specific embodiments and accompanying drawings.

[0075] like Figure 1-3 As shown, the electric nail gun includes a gun needle lifting mechanism 100 , a motor 210 , a cylinder 300 , a nail magazine 400 , an air pump 500 and a handle 600 .

[0076] The gun needle lifting mechanism 100 is used to lift the gun needle 110 upward and compress the gas spring, and its specific structure is described in detail below.

[0077] The motor 210 is used to drive the lifting wheel 120 to rotate and drive the air pump 500 to inflate the gas spring. Specifically, the motor 210 is configured to rotate in both directions. The output shaft at the front end of the motor drives the lifting wheel 120 to rotate via the first transmission device 220, and the output shaft at the rear end of the motor drives the air pump 500 via the second transmission device 230. The first transmission device and the second transmission device are configured so that when the motor rotates in any direction, one of the lifting wheel and the air pump is driven and the other is disengaged from the drive, that is, when the lifting wheel is driven, the flywheel is not driven, and when the flywheel is driven, the lifting wheel is not driven. The first transmission device and the second transmission device are mechanical transmission structures. Figure 16-17 As shown, the electric motor 210 , the first transmission 220 , and the second transmission 230 form the drive device 200 .

[0078] A piston 301 is disposed in the cylinder 300, and the gun needle 110 is connected to the piston 301 and extends downward. A gas spring is disposed on the upper side of the piston to push the piston downward. When the lifting wheel lifts the gun needle upward, the piston 301 moves upward and compresses the gas spring. When the lifting wheel releases the gun needle, the gas spring applies elastic force to the piston, and the piston moves the gun needle downward to drive the nail.

[0079] The nail magazine 400 is used to store nails 401 and transport the stored nails to the lower end position of the gun needle.

[0080] like Fig.16 As shown, the air pump 500 is used to charge compressed air into the sealed cavity 302 through the air charging pipe 501. In the illustrated structure, the air pump charges compressed air into the sealed cavity to form a gas spring, and the compressed air in the sealed cavity is released through the exhaust port 303 to eliminate the gas spring. In other structures, a sealed cavity may be formed on the upper side of the piston, and a permanent compressed gas is sealed in the sealed cavity to form a gas spring.

[0081] The handle 600 is used for the user to hold the nail gun, and a replaceable or rechargeable power source 601 is disposed at the rear end of the handle. A nailing switch 602 is disposed at the lower side of the handle.

[0082] Among them, the gun needle lifting mechanism 100, the motor 210, the cylinder 300, the air pump 500 and the handle 600 are integrated into the body, and the nail magazine 400 is detachably arranged on the body. In particular, the handle 600 extends from the side wall of the cylinder 300 to the rear of the cylinder. The driving device 200 and the nail magazine 400 are located on the left and right sides of the center plane of the handle and the cylinder, so that the mass center of the entire nail gun is as close as possible to the geometric center of the nail gun, so that the user can hold the nail gun freely in any posture without being too heavy.

[0083] like Figure 3-9 As shown, the gun needle lifting mechanism 100 includes a gun needle 110 , a lifting wheel 120 , a movable part 130 , and an elastic element 140 .

[0084] The gun needle 110 has a plurality of teeth 111 distributed along its length.

[0085] The lifting wheel 120 is generally circular, and its circumference includes a first angle range α and a second angle range β. A plurality of lifting portions 121 are distributed in the first angle range. When the lifting wheel rotates to the teeth corresponding to the first angle range, the lifting portions engage with the teeth to lift the gun needle, so as to lift the gun needle to a stop position. Figure 4 The second angle range does not distribute the lifting part so that when the lifting wheel rotates to Figure 5 When the second angle range shown corresponds to the teeth, the lifting part disengages from the teeth to release the gun needle. The lifting wheel 120 includes two spaced walls 122, and a gap 123 is formed between the two spaced walls. An arc-shaped through hole 125 is provided on the lifting wheel, and a rod 126 is passed through the arc-shaped through hole. The lifting part 121 is a pin assembled on the lifting wheel. In other embodiments, the lifting part can be a tooth. The two ends of the pin are assembled on the two spaced walls, and the middle part of the lifting part is located in the gap. Moreover, the pin is movably assembled on the lifting wheel, which is achieved by providing a blind hole on the lifting wheel, inserting the pin into the blind hole, and covering the end surface of the lifting wheel with a cover plate 124, which constrains the pin to the lifting wheel. The edge of the second angular range β of the lifting wheel is concave, that is, the edge of the second angular range of the lifting wheel is located on the inner side of the contour of the circle determined by the edge of the first angular range. In other words, the distance between the edge of the second angular range of the lifting wheel and the center of the lifting wheel is smaller than the distance between the edge of the first angular range of the lifting wheel and the center of the lifting wheel.

[0086] The movable member 130 is movably mounted on the lifting wheel 120 and is configured to change from a first position to a second position as the lifting wheel rotates to adjust the lifting portion to accurately mesh with the teeth. Specifically, the movable member is swingably mounted in the gap of the lifting wheel 120 via a pin 133, and the movable member is adjacent to the starting end of the first angle range α, which is the end of the first angle range that first passes through the lifting portion and meshes with the teeth when the lifting wheel rotates to lift the gun needle. The movable member 130 has a force-bearing portion 131 and a meshing portion 132.

[0087] The configuration of the force bearing part and the meshing part is:

[0088] In the direction of rotation of the lifting wheel lifting the gun needle, that is, Figure 4-9 In the counterclockwise direction, the force-bearing portion 131 approaches and leaves the gun needle 110 later than the meshing portion 132 , and the force-bearing portion 131 contacts the gun needle earlier than the meshing portion 132 .

[0089] Moreover, when the movable member 130 is located at the first position, the force-bearing portion 131 is located at the resisting position, and the meshing portion 132 deviates from the meshing position. When the movable member rotates with the lifting wheel, the force-bearing portion is resisted by the teeth and overcomes the elastic force of the elastic element to make the movable member move from the first position to the second position. When the movable member is located at the second position, the force-bearing portion 131 deviates from the resisting position, and the meshing portion 132 is located at the meshing position and is in a sequence of meshing with the teeth together with the lifting portion, that is, the meshing portion and the lifting portion mesh with the teeth one by one. Moreover, the pitch S of the teeth distributed on the gun needle 110 is equal (the distance between any two adjacent teeth is equal), the spacing δ (the angular distance is equal) between any two adjacent lifting portions, when the meshing portion is located at the meshing position and is in a sequence of meshing with the teeth together with the lifting portion, the angular distance θ between the meshing portion and the adjacent lifting portion is equal to the spacing δ between the lifting portions.

[0090] The elastic element acts on the movable member to cause the movable member to return from the second position to the first position. Figure 10-13 In the figure, the elastic element includes a first torsion spring 141 and a second torsion spring 142. The first torsion spring and the second torsion spring are separately located at two ends of the lifting wheel and are positioned on the rotating shaft of the lifting wheel. The first torsion spring and the second torsion spring are symmetrical and one end of them is hooked in the hole on the lifting wheel and the other end is against the end of the rod, so that the elastic element acts on the rod to make the rod apply elastic force to the movable part.

[0091] In other configurations, the elastic element may be Fig.15 The tension spring 143 shown in the figure has two ends connected to the lifting wheel and the movable part respectively. Fig.14 The compression spring 144 shown has two ends supported on the lifting wheel and the movable member respectively.

[0092] According to the nail gun of the above structure, when working, the motor 210 is first started to rotate in one direction, and the air pump 500 is driven by the second transmission device 230 to inflate the sealed chamber 302 to form an air spring. After the inflation pressure reaches the set standard, the inflation is stopped. During the inflation period, the motor is disengaged from the drive of the lifting wheel through the first transmission device 220, and the lifting wheel does not rotate. Afterwards, the motor is made to rotate in the other direction, and the lifting wheel 120 is driven by the first transmission device as shown in FIG. Figure 4-9 The lifting wheel 120 lifts the gun needle when it rotates counterclockwise as shown. The lifting wheel lifts and releases the gun needle once for each rotation of the lifting wheel, and nails once. When in use, the nailing switch 602 can be controlled by a finger to make the motor rotate continuously to drive the lifting wheel to achieve continuous nailing, or the nailing switch can be controlled by a finger to make the motor rotate intermittently to drive the lifting wheel to achieve intermittent nailing.

[0093] According to the gun needle lifting mechanism described above, the process of lifting the gun needle for nailing is:

[0094] 1. As Figure 4 As shown, the gun needle 110 is usually kept in a high position, so that once the nailing action is started, the gun needle can be lowered without lifting the gun needle to a high position first, thereby improving the nailing efficiency. In this position, the lifting portion of the lifting wheel in the first angle range α adjacent to the second angle range β is engaged with the lowest tooth on the gun needle 110 to keep the gun needle there.

[0095] 2. In Figure 4 In the state shown, the motor is started to drive the lifting wheel 120 to rotate counterclockwise to Figure 5 When the second angle range β corresponds to the tooth 111, the lifting portion 121 is disengaged from the tooth 111 to release the gun needle, and the piston moves downward quickly with the gun needle under the elastic force of the gas spring. Figure 6 As the lifting wheel continues to rotate, the movable member 130 approaches the gun needle. At this time, the movable member is located at the first position under the elastic force of the elastic element, the force-bearing portion 131 is located at the blocking position, and the meshing portion 132 deviates from the meshing position. The force-bearing portion is located at the blocking position, which means that the force-bearing portion will be blocked by the teeth on the gun needle as the lifting wheel rotates, and the meshing portion deviates from the meshing position, which means that the meshing portion will not mesh with the teeth on the gun needle as the lifting wheel rotates.

[0096] 3. When the lifting wheel continues to rotate until Figure 7 When the force-bearing portion 131 is in the position shown, the force-bearing portion 131 is resisted by the teeth 111 and overcomes the elastic force of the elastic element to cause the movable member 130 to move from Figure 7 The first position shown moves to Figure 8 In the second position shown in FIG. 1 , the movable part makes a clockwise swing and is located at Figure 8In the second position shown, the force-bearing portion 131 deviates from the blocking position to avoid the tooth 111, and the meshing portion 132 is in the meshing position to mesh with the tooth 111 and is in the meshing sequence with the lifting portion 121. In other words, Figure 8 In the embodiment, the meshing portion 132 meshes with the topmost tooth on the gun needle, the lifting portion adjacent to the meshing portion meshes with the second tooth from top to bottom on the gun needle, and the remaining lifting portions mesh with the remaining teeth on the gun needle in a one-to-one correspondence. Figure 8 The state shown continues to rotate, the movable member 130 moves away from the gun needle 110, and the elastic element causes the movable member to return to the first position. Figure 4 In the state shown, lift the gun needle to the high position and turn it to Figure 5 The position shown releases the gun needle for nailing. Figure 4 The status shown has been Figure 5-8 The status shown rotates one circle and then resets to Figure 4 The state shown in the figure means that one nailing cycle is completed. The lifting wheel can be controlled to rotate continuously to continuously nail.

[0097] During the nailing process, when the gun needle 110 cannot reach Figure 4 When the gun needle moves from Figure 5 The status shown only drops to Fig. 9 When the needle is about half the distance shown, the movable part will also move as the lifting wheel rotates. Figure 6-8 The swinging action of the process shown in the figure finally reaches Fig. 9 The meshing portion 132 shown is meshed with the fifth tooth from top to bottom on the gun needle, and the lifting portion adjacent to the meshing portion is meshed with the sixth tooth from top to bottom on the gun needle, and the remaining teeth on the gun needle can be kept in mesh with part of the lifting portion in a one-to-one correspondence. Fig. 9 When the state shown continues to rotate, the gun needle can be lifted to a high position, but the first angle range α has not completely rotated over the gun needle, the second angle range β has not yet rotated to the gun needle, and some of the lifting parts in the first angle range have not yet engaged with the teeth, so the gun needle will not drop. If the lifting wheel continues to rotate, the lifting parts that have not yet engaged with the teeth in the first angle range will engage with the two lowest teeth on the gun needle one by one, causing the gun needle to do a slight lift at a high position until all the teeth are turned away from the gun needle, the first angle range is turned away from the gun needle, and the second angle range is turned to the gun needle, and the gun needle can be lowered to nail. When the gun needle is slightly lifted at a high position, the meshing of the lifting part and the two lowest teeth on the gun needle is precisely matched, and because the gas spring is compressible, this slight lifting of the gun needle at a high position will not cause jamming or damage to the structure.

[0098] During the nailing process, the lifting wheel only rotates, and the height of the lifting wheel does not change. Figure 4-9 In the diagram, the height of the needle is indicated with reference to the lifting wheel.

Claims

1. The needle lifting mechanism is characterized by include: A gun needle (110) having a plurality of teeth (111) distributed along its length; A lifting wheel (120) whose circumference includes a first angle range (α) and a second angle range (β), wherein a plurality of lifting parts (121) are distributed in the first angle range so that when the lifting wheel rotates to teeth corresponding to the first angle range, the lifting parts engage with the teeth to lift the gun needle, and no lifting parts are distributed in the second angle range so that when the lifting wheel rotates to teeth corresponding to the second angle range, the lifting parts disengage from the teeth to release the gun needle; A movable member (130) is movably mounted on the lifting wheel and is configured to change from a first position to a second position as the lifting wheel rotates to adjust the lifting portion to accurately mesh with the teeth; The elastic element acts on the movable member to cause the movable member to return from the second position to the first position.

2. The needle lifting mechanism according to claim 1, characterized in that: The movable member (130) is movably mounted on the lifting wheel (120) near the starting end of the first angle range (α), the starting end being the end of the first angle range that first passes through the lifting portion and meshes with the teeth when the lifting wheel rotates to lift the gun needle. The movable member comprises a force-bearing portion (131) and a meshing portion (132); The force-bearing portion (131) and the meshing portion (132) are configured as follows: when the movable part is in the first position, the force-bearing portion is in the resisting position, and the meshing portion deviates from the meshing position; when the movable part rotates with the lifting wheel, the force-bearing portion is resisted by the teeth and overcomes the elastic force of the elastic element to enable the movable part to move from the first position to the second position; when the movable part is in the second position, the force-bearing portion deviates from the resisting position, and the meshing portion is in the meshing position and is in a sequence of meshing with the teeth together with the lifting part.

3. The needle lifting mechanism according to claim 2, characterized in that: The pitches (S) of the teeth distributed on the gun needle are equal, the spacing (δ) between any two adjacent lifting parts is equal, and when the meshing part is in the meshing position and is in the sequence of meshing with the teeth together with the lifting part, the angular distance (θ) between the meshing part and the adjacent lifting part is equal to the spacing (δ) between the lifting parts.

4. The needle lifting mechanism according to claim 2, characterized in that: The lifting part (121) is a pin assembled on the lifting wheel.

5. The needle lifting mechanism according to claim 4, characterized in that: The lifting wheel (120) comprises two spaced walls (122), a gap (123) is formed between the two spaced walls, two ends of the lifting part are assembled on the two spaced walls, and the middle part of the lifting part is located in the gap.

6. The needle lifting mechanism according to claim 4 or 5, characterized in that: The pin is movably assembled on the lifting wheel, and the end surface of the lifting wheel is covered with a cover plate (124), which constrains the pin to the lifting wheel.

7. The needle lifting mechanism according to claim 5, characterized in that: The movable member (130) is swingably assembled in the gap via the pin shaft (133).

8. The needle lifting mechanism according to claim 1 or 5, characterized in that: The lifting wheel (120) is provided with an arc-shaped through hole (125), a rod (126) is passed through the arc-shaped through hole, and an elastic element acts on the rod so that the rod applies elastic force to the movable part.

9. The needle lifting mechanism according to claim 8, characterized in that: The elastic element comprises a first torsion spring (141) and a second torsion spring (142), wherein the first torsion spring and the second torsion spring are separately located at two ends of the lifting wheel and act on two ends of the rod respectively.

10. The needle lifting mechanism according to claim 1 or 5, characterized in that: The elastic element is a tension spring (143), and two ends of the tension spring are respectively connected to the lifting wheel and the movable part.

11. The needle lifting mechanism according to claim 1 or 5, characterized in that: The elastic element is a compression spring (144), and two ends of the compression spring are respectively supported on the lifting wheel and the movable part.

12. The needle lifting mechanism according to claim 1, characterized in that: The edge of the second angular range (β) of the lifting wheel is concave.

13. Nail gun, characterized by include: The needle lifting mechanism (100) according to any one of claims 1 to 12; A motor (210) for driving the lifting wheel to rotate; A cylinder (300) is provided with a piston (301) in the cylinder, a gun needle (110) is connected to the piston (301) and extends downward, and a gas spring is provided on the upper side of the piston for pushing the piston to move downward; The nail magazine (400) is used to store nails (401) and transport the stored nails to the lower end of the gun needle.

14. The nail gun according to claim 13, characterized in that: A sealed cavity is formed on the upper side of the piston, and permanent compressed gas is sealed in the sealed cavity to form a gas spring.

15. The nail gun according to claim 13, characterized in that: The nail gun comprises an air pump (500); a sealed cavity (302) is formed on the upper side of the piston, and the sealed cavity has an exhaust port (303); compressed air is filled into the sealed cavity through the air pump to form an air spring, and the compressed air in the sealed cavity is released through the exhaust port to eliminate the air spring.

16. The nail gun according to claim 15, characterized in that: The motor (210) is configured to rotate in both directions. The motor drives the lifting wheel to rotate via a first transmission device (220). The motor drives the air pump via a second transmission device (230). The first transmission device and the second transmission device are configured so that when the motor rotates in either direction, one of the lifting wheel and the air pump is driven and the other is disengaged from the driving.

Images