A double cam fastener driving machine

Abstract

The present invention discloses a double-cam fastener driving machine, which includes: an energy storage unit; an impact unit for driving the energy storage unit to store energy and being able to withstand the energy released by the energy storage unit to drive the fastener into a workpiece; a rotary power mechanism; a pushing mechanism, which is connected and linked to the impact unit; a double-cam mechanism, which includes a first cam and a second cam that can be selectively clutched, the first cam is connected to the rotary power mechanism and driven by the rotary power mechanism to rotate, and the second cam is connected and linked to the pushing mechanism. The present invention adopts a double-cam mechanism to achieve the clutch of the rotary power mechanism and the pushing mechanism, and the impact unit and the pushing mechanism are not disengaged, so that the double-cam mechanism can be correctly engaged when the impact unit is quickly released for normal nailing or nailing, thereby improving the transmission efficiency, and can achieve the rapid release of the impact unit, ensuring the stability and smoothness of the operation of the impact unit, improving the work quality, and having extremely strong market competitiveness.

Description

Technical field:

[0001] The invention relates to the technical field of mechanical tool products, in particular to a double-cam fastener driving machine. Background technology:

[0002] In a fast fastening machine (also known as a nail gun or fastener driving machine), it is usually necessary to store energy by compressing or pulling an energy storage unit (such as gas, compression spring, rubber, vacuum), and then quickly release it to achieve external work.

[0003] In the prior art, quick fastening machines generally use an incomplete gear-rack structure as a driving mechanism to drive the impact unit to compress the energy storage unit, so as to achieve the purpose of storing energy; when the energy storage unit releases energy to drive the impact unit to drive the fastener into the object, the driving mechanism will be separated from the impact unit, resulting in the driving mechanism being unable to properly engage with the impact unit when the impact unit is quickly released or the nail is stuck, which is not conducive to improving the transmission efficiency, greatly increases the time used for the working cycle, and cannot guarantee the stability and smoothness of the operation of the impact unit.

[0004] In view of this, the inventor proposes the following technical solution. Summary of the invention:

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a double-cam fastener driving machine.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: the double-cam fastener driving machine includes: an energy storage unit; an impact unit used to drive the energy storage unit to store energy and to withstand the energy released by the energy storage unit to drive the fastener into the workpiece; a rotating power mechanism; a pushing mechanism, which is connected and linked to the impact unit; a double-cam mechanism, which includes a first cam and a second cam that can be selectively clutched, the first cam is connected to the rotating power mechanism and driven to rotate by the rotating power mechanism, and the second cam is connected and linked to the pushing mechanism.

[0007] Furthermore, in the above technical solution, the first cam and the second cam can mesh with each other at a part of their circumferential angle, converting the rotational motion of the first cam into the rotational motion of the second cam, and their rotation directions are opposite; the first cam and the second cam do not mesh with each other at another part of their circumferential angle, thereby achieving disengagement.

[0008] Furthermore, in the above technical solution, when the first cam and the second cam are meshed along their meshing surfaces, the distance between the meshing point and the rotation axis of the first cam gradually increases, and the distance between the meshing point and the rotation axis of the second cam gradually decreases.

[0009] Furthermore, in the above technical solution, the rotary power mechanism includes a gear transmission module, a motor installed in conjunction with the gear transmission module, and a first output shaft installed on the gear transmission module and used to drive the first cam to rotate.

[0010] Furthermore, in the above technical solution, a clamping shaft is fixed to the first output shaft, the first cam is rotatably mounted on the first output shaft, and an arc groove is provided on the first cam, and the end of the clamping shaft extends into the arc groove; the clamping shaft includes a base and a shaft body formed on one side of the base and perpendicular to the base, the base is fixedly mounted on the first output shaft, and the shaft body extends vertically into the arc groove from top to bottom.

[0011] Furthermore, in the above technical solution, the second cam is fixed on the second output shaft; the pushing mechanism includes a first pulley fixed on the second output shaft, a rope connected to the first pulley, and a plurality of second pulleys for guiding the rope to turn, and the end of the rope is connected to the impact unit after passing through the second pulley.

[0012] Furthermore, in the above technical solution, the impact unit includes a piston arranged in the energy storage unit and a striker connected to the piston, and the end of the rope of the pushing mechanism is connected to the rear end center of the piston.

[0013] Furthermore, in the above technical solution, the piston is arranged in the cylinder body, and the periphery of the piston is in sealed contact with the interior of the cylinder body, and the energy storage unit is placed between the piston and the cylinder body; the rear end of the cylinder body is provided with a hole for the rope to pass through.

[0014] Furthermore, in the above technical solution, the energy storage unit and the rotating power mechanism are both fixed to the base, the upper and lower ends of the first output shaft are respectively mounted on the base through the first bearing and the second bearing, and the upper and lower ends of the second output shaft are respectively mounted on the base through the third bearing and the fourth bearing; the first convex portion and the second convex portion are formed at the front end of the upper portion of the base, and the first bearing and the third bearing are respectively mounted in the first convex portion and the second convex portion.

[0015] Furthermore, the above technical solution also includes a nail guide plate and a nail clamp arranged at the lower end of the nail guide plate and used to transport fasteners to the nail guide plate. The nail guide plate has a channel for the striker in the impact unit to pass through.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: when the present invention is working, the rotating power mechanism drives the first cam to rotate, and when the first cam is meshed with the second cam, the second cam can be driven to rotate, thereby driving the pushing mechanism to work to drive the impact unit to drive the energy storage unit to store energy. Specifically, the piston in the impact unit is pulled to move by the rope in the pushing mechanism, and the piston moves in the cylinder and generates a vacuum in the cylinder, thereby driving the storage unit to store energy; when the first cam rotates to a non-meshing state with the second cam, the second cam can no longer be the pushing mechanism. The structure provides power, and the impact unit rushes out under the action of the energy released by the energy storage unit to drive the fastener into the workpiece, and the pushing mechanism and the second cam run together with the impact unit, that is, the pushing mechanism is not separated from the impact unit at all times, and the first cam and the second cam are selectively clutched to drive the pushing mechanism to work, so that the double cam mechanism can be correctly engaged when the impact unit is quickly released for normal nailing or nailing, thereby improving the transmission efficiency, and realizing the rapid release of the impact unit, ensuring the stability and smoothness of the operation of the impact unit, improving the work quality, and making the present invention have strong market competitiveness. Description of the drawings:

[0017] Figure 1 is a stereogram of the present invention;

[0018] Figure 2 is a cross-sectional view of the present invention;

[0019] Figure 3 is a cross-sectional view from another perspective of the present invention;

[0020] Figure 4 It is the internal structure diagram of the present invention;

[0021] Figure 5 It is an internal structure diagram of another perspective of the present invention;

[0022] Figure 6 It is an assembly diagram of the push mechanism, the impact unit and the double cam mechanism in the present invention;

[0023] Figure 7 yes Figure 6 Exploded view;

[0024] Figure 8 It is a working state diagram of the present invention;

[0025] Fig. 9 It is a state diagram of the present invention after stapling. Specific implementation method:

[0026] The present invention is further described below in conjunction with specific embodiments and drawings.

[0027] See Figure 1-9As shown, a double-cam fastener driving machine includes: an energy storage unit 1; an impact unit 2 for driving the energy storage unit 1 to store energy and being able to withstand the energy released by the energy storage unit 1 to drive the fastener into the workpiece; a rotating power mechanism 3; a pushing mechanism 4, which is connected to and linked with the impact unit 2; a double-cam mechanism 5, which includes a first cam 51 and a second cam 52 that can be selectively clutched, the first cam 51 is connected to the rotating power mechanism 3 and is driven by the rotating power mechanism 3 to rotate, and the second cam 52 is connected to and linked with the pushing mechanism 4. When the present invention is working, the rotating power mechanism 3 drives the first cam 51 to rotate, and when the first cam 51 is engaged with the second cam 52, the second cam 52 can be driven to rotate, thereby driving the pushing mechanism 4 to work to drive the impact unit 2 to drive the energy storage unit 1 to store energy; when the first cam 51 rotates to be in a non-engaged state with the second cam 52, the second cam 52 can no longer provide power for the pushing mechanism 4, and the impact unit rushes out under the action of the energy released by the energy storage unit to drive the fastener into the workpiece, and the pushing mechanism 4 and the second cam 52 run together with the impact unit, that is, the pushing mechanism 4 and the impact unit 2 are not separated at all times, and the first cam 51 and the second cam 52 are selectively clutched to drive the pushing mechanism to work, so that the double cam mechanism can be correctly engaged when the impact unit is quickly released for normal nailing or nailing, thereby improving the transmission efficiency, and realizing the rapid release of the impact unit, ensuring the stability and smoothness of the operation of the impact unit, improving the work quality, and making the present invention have extremely strong market competitiveness.

[0028] The energy storage unit 1 is a medium that can store energy through displacement changes, such as an air spring, a mechanical spring, a rubber element, a vacuum, etc.

[0029] When the double cam mechanism 5 is in the meshing state, the pushing mechanism 4 can drive the impact unit to move in the first direction, so that the energy storage unit stores energy; when the double cam mechanism 5 is in the non-meshing state, the pushing mechanism 4 and the second cam 52 move together with the impact unit in the second direction under the action of the energy storage unit force, so as to realize the fastener driving function. The first direction refers to the direction of the impact unit 2 toward the energy storage unit 1, and the second direction refers to the direction of the energy storage unit 1 toward the impact unit 2. The definition of the first direction and the second direction can also be determined in the following way: when the first cam and the second cam are meshing, the torque output by the motor drives the impact unit to move to the left position through the gear transmission module, the first output shaft, the first cam, the second cam, and the pushing mechanism, so that the energy storage unit 1 generates a vacuum to store energy, and this movement direction of the impact unit is defined as the first direction; when the first cam and the second cam are meshing and disengaging, that is, in the non-meshing state, the energy storage unit 1 releases energy to drive the impact unit to move to a position close to the guide nail plate 71, and the fastener is driven from the guide nail plate into the workpiece, and this movement direction is defined as the second direction.

[0030] The first cam 51 and the second cam 52 can mesh with each other at a portion of their circumferential angles, converting the rotational motion of the first cam 51 into the rotational motion of the second cam 52, and their rotation directions are opposite; the first cam 51 and the second cam 52 do not mesh with each other at another portion of their circumferential angles, thereby achieving disengagement. When the first cam 51 and the second cam 52 mesh along their meshing surfaces, the distance between the meshing point and the rotation axis of the first cam 51 gradually increases, and the distance between the meshing point and the rotation axis of the second cam 52 gradually decreases.

[0031] The meshing surface of the first cam 51 can be set as an involute surface; the meshing surface of the second cam 52 can be set as an involute surface. Of course, the meshing surface of the first cam 51 and the meshing surface of the second cam 52 can also be set to other shapes as long as the same technical effect is achieved. Among them, the meshing surfaces of the first cam 51 and the second cam 52 are both set as involute surfaces, so that the force arm of the pressure between the first cam 51 and the second cam 52 is constant, and the relative motion along the common normal plane of the two involute surfaces can be regarded as pure rolling, so as to improve the rotation efficiency.

[0032] The rotary power mechanism 3 includes a gear transmission module 31, a motor 32 mounted with the gear transmission module 31, and a first output shaft 33 mounted on the gear transmission module 31 and used to drive the first cam to rotate. The motor 32 provides torque and speed. The gear transmission module 31 adopts one or more layers of planetary gear transmission. In this embodiment, three layers of planetary gear transmission are adopted to reduce the speed and increase the torque. A clamping shaft 34 is fixed on the first output shaft 33. The first cam 51 is sleeved on the first output shaft 33 in a self-rotating manner. The first cam 51 is provided with an arc groove 511, and the end of the clamping shaft 34 extends into the arc groove 511. The output of the motor 32 is transmitted to the first output shaft 33 after passing through the gear transmission module 31. The two ends of the first output shaft 33 are supported by the first and second bearings. The first cam is located between the first and second bearings. The clamping shaft is installed on the first output shaft and can rotate with the first output shaft and transmit torque to the first cam 51, thereby driving the first cam 51 to rotate. When the first output shaft 33 rotates counterclockwise, driven by the clamping shaft 34 , the first cam 51 also rotates counterclockwise.

[0033] The clamping shaft 34 includes a base 341 and a shaft body 342 formed on one side of the base 341 and perpendicular to the base 341 . The base 341 is fixedly sleeved on the first output shaft 33 , and the shaft body 342 vertically extends into the arc groove 511 from top to bottom.

[0034] The second cam 52 is fixed on the second output shaft 53; the pushing mechanism 4 includes a first pulley 41 fixed on the second output shaft 53, a rope 42 connected to the first pulley 41, and a plurality of second pulleys 43 for guiding the rope 42 to turn, and the end of the rope 42 passes through the second pulley 43 and is connected to the impact unit 2. The first pulley 41 rotates with the rotation of the second output shaft 53.

[0035] The impact unit 2 includes a piston 22 disposed in the energy storage unit 1 and a striker 21 connected to the piston 22 , and the end of the rope 42 is connected to the rear end center of the piston 22 .

[0036] The piston 22 is arranged in the cylinder 11, and the outer periphery of the piston 22 is in sealed contact with the inside of the cylinder 11. The energy storage unit 1 is a vacuum, and the energy storage unit 1 is placed between the piston 22 and the cylinder 11; the rear end of the cylinder 11 is provided with a hole 111 for the rope 42 to pass through. The energy storage unit 1 and the rotary power mechanism 3 are both fixed to the base 6. Initially, the piston fits the end surface of the base 6. When the piston 22 moves backward for a distance, due to the lack of gas replenishment, the closed space formed by the cylinder, the piston and the base 6 will generate a vacuum (i.e., the energy storage unit 1).

[0037] There are two second pulleys 43, one of which is arranged on the rear end side of the cylinder body 11, and the other second pulley is arranged at the hole 111 of the cylinder body 11, so that the end of the rope 42 is connected to the center of the rear end surface of the piston 22 after passing through the two second pulleys 43, and the end part of the rope 42 is located in the same straight line with the axis of the piston 22, so that the rope 42 can pull the piston 22 to move in the cylinder body, and it is most labor-saving.

[0038] The upper and lower ends of the first output shaft 33 are respectively installed on the base 6 through the first bearing 331 and the second bearing 332, and the upper and lower ends of the second output shaft 53 are respectively installed on the base 6 through the third bearing 531 and the fourth bearing 532; the first convex portion 61 and the second convex portion 62 are formed at the front end of the upper part of the base 6, and the first bearing 331 and the third bearing 531 are respectively installed in the first convex portion 61 and the second convex portion 62.

[0039] The present invention also includes a nail guide plate 71 and a nail clamp 72 disposed at the lower end of the nail guide plate 71 and used to convey fasteners to the nail guide plate 71. The nail guide plate 71 has a channel for the striker 21 in the impact unit 2 to pass through. The nail clamp is a fastener loading device that can convey fasteners (such as nails) to the nail guide plate. The nail guide plate receives the fasteners from the nail clamp. When the fasteners fall into the channel of the nail guide plate, the striker 21 in the impact unit passes through the channel when the energy storage unit 1 releases its energy to impact, and drives the fasteners (such as nails) in the channel into the workpiece (usually wood, metal plates or cement, etc.).

[0040] Combination Figure 8 As shown, states a, b, c, and d in the figure correspond to a working cycle. As shown in state a, at this time, the impact unit is located at the position where the fastener is driven into the base, and the first output shaft 33 drives the first cam 51 to rotate counterclockwise until it starts to mesh with the second cam 52, so that the second cam 52 rotates clockwise, thereby driving the first pulley 41 to rotate clockwise. After the first pulley 41 rotates clockwise to a certain angle, the rope 42 is tightened, and starts to drive the impact unit 2 to move along the first direction, generating a vacuum. The first output shaft 33 continues to rotate, and the first cam 51 and the second cam 52 continue to mesh until the impact unit reaches the maximum stroke along the first direction, and the vacuum reaches the maximum, as shown in state b. The first output shaft 33 continues to rotate counterclockwise, and the first cam 51 disengages from the second cam 52 after rotating a certain angle. The impact unit 2 moves at high speed along the second direction under the action of the external atmospheric pressure, and at the same time drives the pushing mechanism 4, the second output shaft and the second cam 52 to rotate counterclockwise together, as shown in state c. There is a certain virtual position between the arc groove 511 of the first cam 51 and the end of the clamping shaft 34. When the second cam 52 rotates counterclockwise, a force acts on the first cam 51 in the counterclockwise direction. Under the action of this force, the first cam 51 disengages from the clamping shaft and accelerates counterclockwise rotation, thereby realizing the rapid disengagement of the first cam 51 and the second cam 52. After the first cam 51 and the second cam 52 are disengaged, the impact unit drives the fasteners in the nail guide plate into the workpiece (usually wood, metal plate or cement, etc.), and drives the pushing mechanism, the second output shaft and the second cam 52 back to the initial position. The first output shaft 33 continues to rotate counterclockwise, driving the clamping shaft 34 to re-engage with the first cam 41, as shown in state d. The first output shaft 33 continues to rotate counterclockwise, driving the first cam 51 to rotate until it re-engages with the second cam 52, and the working cycle returns to the state shown in state a.

[0041] Combination Fig. 9 As shown in the figure, when the nail is stuck for some reason, the fastener is stuck in the nail guide plate, and the impact unit 2 may stop at any position along the second direction, as shown in state e. Since the second cam 52 can be properly engaged with the first cam 51 at any position corresponding to the stroke of the impact unit 2. After the nail is stuck, the first output shaft 33 continues to rotate counterclockwise, and after the clamping shaft 34 re-engages with the first cam 51, it continues to rotate counterclockwise, driving the first cam 51 to rotate until it re-engages with the second cam 52, as shown in state f. The first output shaft continues to rotate, and the second cam 52 can drive the pushing mechanism 4 to move the impact unit 2 along the first direction, so that the mechanism can enter the state b of the working cycle, thereby entering the normal working cycle.

[0042] In summary, when the present invention is working, the rotating power mechanism 3 drives the first cam 51 to rotate, and when the first cam 51 is engaged with the second cam 52, the second cam 52 can be driven to rotate, thereby driving the pushing mechanism 4 to work to drive the impact unit 2 to drive the energy storage unit 1 to store energy. Specifically, the piston in the impact unit is pulled to move by the rope in the pushing mechanism, and the piston moves in the cylinder and generates a vacuum in the cylinder, thereby driving the storage unit to store energy; when the first cam 51 rotates to a non-engaged state with the second cam 52, the second cam 52 can no longer provide power to the pushing mechanism 4, and the impact unit 2 drives the energy storage unit 1 to store energy. The impact unit rushes out under the action of the energy released by the energy storage unit to drive the fastener into the workpiece, and the pushing mechanism 4 and the second cam 52 run together with the impact unit, that is, the pushing mechanism 4 and the impact unit 2 are always connected, and the first cam 51 and the second cam 52 are selectively engaged to drive the pushing mechanism to work, so that the double cam mechanism can be correctly engaged when the impact unit is quickly released for normal nailing or nailing, thereby improving the transmission efficiency and realizing the rapid release of the impact unit, ensuring the stability and smoothness of the operation of the impact unit, improving the work quality, and making the present invention have strong market competitiveness.

[0043] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A double cam fastener driving machine, characterized in that: It includes: Energy storage unit (1); An impact unit (2) used to drive the energy storage unit (1) to store energy and capable of withstanding the energy released by the energy storage unit (1) to drive the fastener into the workpiece; Rotary power mechanism (3); A pushing mechanism (4) connected to and linked with the impact unit (2); A double cam mechanism (5), comprising a first cam (51) and a second cam (52) which can be selectively engaged and disengaged, the first cam (51) being connected to a rotary power mechanism (3) and driven by the rotary power mechanism (3) to rotate, the second cam (52) being connected to a push mechanism (4) and being linked to each other, wherein the first cam (51) and the second cam (52) can mesh with each other at a portion of their circumferential angles, converting the rotary motion of the first cam (51) into the rotary motion of the second cam (52), and the rotation directions of the first cam (51) and the second cam (52) are opposite; The rotary power mechanism (3) comprises a first output shaft (33); a clamping shaft (34) is fixed to the first output shaft (33); the first cam (51) is sleeved on the first output shaft (33) in a self-rotatable manner, and an arc groove (511) is provided on the first cam (51); the end of the clamping shaft (34) extends into the arc groove (511); the clamping shaft (34) comprises a base (341) and a shaft body (342) formed on one side of the base (341) and perpendicular to the base (341); the base (341) is fixedly sleeved on the first output shaft (33), and the shaft body (342) extends vertically from top to bottom into the arc groove (511).

2. A dual cam fastener driver according to claim 1, characterized in that: The first cam (51) and the second cam (52) are not engaged at another portion of their circumferential angles, thereby achieving disengagement.

3. A dual cam fastener driver according to claim 2, characterized in that: When the first cam (51) and the second cam (52) are meshed along their meshing surfaces, the distance between the meshing point and the rotation axis of the first cam (51) gradually increases, and the distance between the meshing point and the rotation axis of the second cam (52) gradually decreases.

4. A dual cam fastener driver according to claim 1, characterized in that: The rotary power mechanism (3) further comprises a gear transmission module (31) and a motor (32) mounted in cooperation with the gear transmission module (31); the first output shaft (33) is mounted on the gear transmission module (31) and is used to drive the first cam to rotate.

5. A dual cam fastener driver according to any one of claims 1 to 4, characterized in that: The second cam (52) is fixed on the second output shaft (53); the pushing mechanism (4) comprises a first pulley (41) fixed on the second output shaft (53), a rope (42) connected to the first pulley (41), and a plurality of second pulleys (43) for guiding the rope (42) to turn, and the end of the rope (42) passes through the second pulley (43) and is connected to the impact unit (2).

6. A dual cam fastener driver according to claim 1, characterized in that: The impact unit (2) comprises a piston (22) arranged in the energy storage unit (1) and a striker (21) connected to the piston (22), and the end of a rope (42) in the pushing mechanism (4) is connected to the rear end center of the piston (22).

7. A dual cam fastener driver according to claim 6, characterized in that: The piston (22) is arranged in the cylinder body (11), and the periphery of the piston (22) is in sealing contact with the inside of the cylinder body (11), and the energy storage unit (1) is placed between the piston (22) and the cylinder body (11); and a hole (111) for the rope (42) to pass through is provided at the rear end of the cylinder body (11).

8. A dual cam fastener driver according to claim 5, characterized in that: The energy storage unit (1) and the rotating power mechanism (3) are both fixed to the base (6); the upper and lower ends of the first output shaft (33) are respectively mounted on the base (6) via a first bearing (331) and a second bearing (332); the upper and lower ends of the second output shaft (53) are respectively mounted on the base (6) via a third bearing (531) and a fourth bearing (532); a first convex portion (61) and a second convex portion (62) are formed at the front end of the upper portion of the base (6); the first bearing (331) and the third bearing (531) are respectively mounted in the first convex portion (61) and the second convex portion (62).

9. A dual cam fastener driver according to any one of claims 1 to 4, characterized in that: It also includes a nail guide plate (71) and a nail clamp (72) arranged at the lower end of the nail guide plate (71) and used to transport fasteners to the nail guide plate (71). The nail guide plate (71) has a channel for the striker (21) in the impact unit (2) to pass through.

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