Weak induction anti-air shot structure of electric nail gun

Abstract

The utility model discloses a kind of weak electric induction anti-idling structures of electric nail gun, including a nail magazine mechanism, nail magazine mechanism is by left nail magazine, right nail magazine, nail feeder and nail feeding spring is constituted, right nail magazine is movably installed on left nail magazine and forms nail storage groove in both interiors, nail feeder is arranged in nail storage groove and can move up and down along nail storage groove, nail feeding spring is arranged between nail feeder and the bottom of nail storage groove, the inner side wall of left nail magazine is provided with a linear guide slot, linear guide slot is hollowed out in the part close to the top of left nail magazine and is communicated with outside;Weak electric sensor is provided on the outer side wall of left nail magazine, and the sensing contact of weak electric sensor is located above linear guide slot hollowed-out part;The side of nail feeder is provided with an outer protrusion, and the outer protrusion extends into the linear guide slot.The weak electric induction anti-idling structure of electric nail gun is designed, which can send signal to cut off the circuit of driving motor after the nails in nail magazine are shot, to prevent the phenomenon of idling of nail gun, and also avoid waste caused by remaining nails.

Description

Technical Field

[0001] This invention relates to an electric nail gun, specifically a low-voltage induction anti-dry-firing structure for an electric nail gun. Background Technology

[0002] In the operation of an electric nail gun, the purpose is to securely fasten two or more objects together with the fired nails. Without an anti-dry-firing device, the nail gun cannot detect the remaining nails in the magazine, allowing it to continue firing even after all the nails have been fired. This results in ineffective, cyclical operation of the nail gun's various systems. Furthermore, because the gun has run out of nails, the objects appear securely connected, creating a false impression of tightness and ultimately leading to substandard product fastening quality.

[0003] To address this issue, existing nail guns are generally equipped with anti-air-firing mechanisms, and are divided into two types based on their structural principles.

[0004] One type of anti-dry-firing structure uses an optocoupler sensing structure. Its working principle is to use an optocoupler to sense the position of the last nail at the end of the nail pack in the nail magazine. When the nails are loaded into the magazine, the optocoupler's beam path is blocked by the nails. At this time, the nail gun's drive power supply remains on, ensuring continuous nailing operation. This process continues until the last nail crosses the optocoupler's beam path. At this point, the optocoupler's beam path is connected, triggering a signal. The optocoupler receiver senses the position of the last nail, causing the controller to immediately cut off the drive power, thus stopping the nail gun. Only when nails are loaded again and the optocoupler's beam is blocked again does the nail gun's drive system regain power and resume nailing. However, the optical coupler used for the above detection is limited by the shape and structure of the optical coupler itself and the physical structure of the lower cover in the nail gun's nailing mechanism. It cannot be set close to the top of the nail slot. At most, it can only be set at a certain distance below the top of the nail slot, that is, close to the bottom of the lower cover. This means that when the optical coupler senses the position of the last nail in the nail pack, there are still a number of nails left in the nail box, resulting in leftover nails and causing some waste.

[0005] Another type of anti-dry-firing structure uses a mechanical lever mechanism to sense the position of the last nail in a nail gun. This structure is very complex, costly to manufacture, and prone to malfunction. Furthermore, because the nails are relatively thin and small, with a cross-sectional dimension of approximately 1mm, the mechanical lever mechanism has a relatively large cumulative manufacturing error, making it difficult to accurately locate the last nail. In addition, due to its inherent physical limitations, the mechanical lever sensing structure can only be placed below the nail gun's lower cover, inevitably resulting in leftover nails when the drive power is cut off, causing unnecessary waste. Summary of the Invention

[0006] To address the aforementioned problems, this invention designs a low-voltage induction anti-dry-firing structure for electric nail guns. This structure can send a signal to cut off the circuit of the drive motor after the nails in the nail magazine have been fired, thus preventing the nail gun from firing dry and avoiding leftover nails that would otherwise be wasted.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A low-voltage induction anti-dry-firing structure for an electric nail gun includes a nail magazine mechanism, which consists of a left nail magazine, a right nail magazine, a nail feeder, and a nail feed spring. The right nail magazine is movably mounted on the left nail magazine, forming a nail storage slot with a nail outlet inside both. The nail feeder is disposed in the nail storage slot and can move up and down along the slot. The nail feed spring is disposed between the nail feeder and the bottom of the nail storage slot. In the initial state, the nail feed spring has a pre-compression, causing the nail feeder to always tend to move upward and eject relative to the nail storage slot. The key feature is that: a linear guide groove is provided on the inner side wall of the left nail magazine, with a portion near the top of the left nail magazine open and communicating with the outside; a low-voltage sensor is provided on the outer side wall of the left nail magazine, with the sensor's sensing contact located above the open portion of the linear guide groove; an outward protrusion is provided on the side of the nail feeder, extending into the linear guide groove. When the outward protrusion moves upward and touches the sensing contact, it will trigger the low-voltage sensor to emit a signal and cut off the driving power of the nail gun.

[0009] More specifically, the aforementioned low-voltage sensor consists of a sensing contact piece and a plastic insulating sleeve. The sensing contact point is located at the head of the sensing contact piece, and the tail of the sensing contact piece is electrically connected to the controller of the nail gun via a wire.

[0010] More specifically, the aforementioned low-voltage sensor is fixed to the outer wall of the left nail box by screws.

[0011] More specifically, the bottom of the aforementioned nail feeder is provided with an upper connecting seat that is inserted into the top of the nail feeding spring.

[0012] More specifically, the bottom of the aforementioned nail storage slot is provided with a lower connecting seat that is inserted into the bottom end of the nail feeding spring.

[0013] The weak current induction anti-dry-firing structure designed in this invention has an outward protrusion that serves as the moving contact point, which is directly located below the side wall of the nail feeder. Combined with a straight guide groove with a hollow structure, it realizes the downward adjustment of the physical position of the induction trigger, breaking the limitation of the setting position of the weak current sensor.

[0014] When the top of the nail feeder moves to the top of the nail slot in the nail gun's nailing device, the outer protrusion contacts the sensing contact, thereby triggering the low-voltage sensor to send a signal, cutting off the nail gun's drive power and stopping it immediately. This precisely prevents dry-firing and eliminates wasted nails. It also precisely avoids false connections or tightness in the nail gun's working object. Only when a new batch of nails is loaded into the nail magazine and the nail feeder is pressed down does the sensing contact separate from the outer protrusion again. At this point, the low-voltage sensor immediately detects this and resumes the nail gun's normal nailing cycle. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of the present invention;

[0016] Figure 2 A three-dimensional structural diagram of the present invention after removing the right nail box;

[0017] Figure 3 A cross-sectional view of the location of the linear guide groove of the present invention;

[0018] Figure 4 A three-dimensional structural diagram of the nail feeder of the present invention;

[0019] Among them, 1—left nail box, 11—linear guide groove, 2—right nail box, 3—nail feeder, 31—upper connecting seat, 32—outer protrusion, 4—nail feeding spring, 5—nail storage groove, 51—upper nail outlet, 52—lower connecting seat, 6—nail driving mechanism, 61—lower cover, 62—upper cover, 63—nail driving groove, 7—nail row, 8—weak current sensor, 81—screw, 8a—inductive contact piece, 8b—plastic insulating sleeve, 82—inductive contact point, 83—wire. Detailed Implementation

[0020] like Figure 1-4 As shown, a low-voltage induction anti-dry-firing structure for an electric nail gun includes a nail magazine mechanism, which consists of a left nail magazine 1, a right nail magazine 2, a nail feeder 3, and a nail feed spring 4.

[0021] The right nail magazine 2 is movably mounted on the left nail magazine 1, forming a nail storage slot 5 inside both. The nail storage slot 5 has an upper nail outlet 51 that connects with the lower cover 61 of the nail gun nailing mechanism 6. The nail feeder 3 is installed in the nail storage slot 5 and can move up and down along the nail storage slot 5. The nail feeder 7 for nailing is installed above the feeder 3. The nail feeding spring 4 is located between the nail feeder 3 and the bottom of the nail storage slot 5. In the initial state, the nail feeding spring 4 has a pre-compression amount, so that the nail feeder 3 always has an upward popping tendency relative to the nail storage slot 5 to realize the nail feeding operation.

[0022] The number of the nail feeding springs 4 can be one, two, or more. This illustration only describes the structure of two nail feeding springs 4; the structure, principle, and effect of other numbers are the same and will not be repeated here. To ensure effective connection of the nail feeding springs 4, the bottom of the nail feeder 3 is provided with an upper connecting seat 31 that inserts into the top of the nail feeding spring 4, and the bottom of the nail storage slot 5 is provided with a lower connecting seat 52 that inserts into the bottom of the nail feeding spring 4.

[0023] The left nail box 1 has a linear guide groove 11 on its inner side wall. The linear guide groove 11 is hollowed out near the top of the left nail box and communicates with the outside. At the same time, the nail feeder 3 has an outer protrusion 32 near the side of the left nail box 1. The outer protrusion 32 extends into the linear guide groove 11 and can slide along the linear guide groove. The outer protrusion 32 is used as a moving contact to detect the remaining amount of nails 7 in the nail storage slot.

[0024] A low-voltage sensor 8 is installed on the outer wall of the left nail box 1, and is fixed to the outer wall of the left nail box 1 by screws 81. The low-voltage sensor 8 consists of a sensing contact piece 8a and a plastic insulating sleeve 8b. The head of the sensing contact piece 8a is provided with a sensing contact point 82, which is located above the hollowed-out part of the linear guide groove 11. The tail of the sensing contact piece 8a is electrically connected to the controller of the nail gun through a wire 83.

[0025] When the last nail enters the nail slot 63 of the nail gun's nailing mechanism 6, the distance between the top of the nail feeder 3 and the top of the nail slot 63 is exactly the cross-sectional size of a nail. After the last nail is fired by the nail gun needle, the needle returns to the stop position at the rear of the nail gun. At this point, there are no nails in the nail slot 63 of the nail gun's nailing mechanism 6. When the needle returns and leaves the nail slot 63, the nail feeder 3 will continue to move towards the upper cover 62 of the nailing mechanism 6 under the action of the nail feeding spring 4. When the top of the nail feeder 3 continues to move towards the top of the nail slot 63, or when the distance between the top of the nail feeder 3 and the top of the nail slot 63 is less than the cross-sectional size of the nail, the outer protrusion 32 on the nail feeder 3 will contact the sensing contact 82, connecting the circuit of the weak current sensor 8, thereby triggering the weak current sensor 8 to send a signal to cut off the driving power of the nail gun and stop the nail gun.

[0026] In summary, the low-voltage induction anti-dry-firing structure designed in this invention places the outer protrusion 32, which serves as the moving contact, directly below the side wall of the nail feeder 3. Combined with the linear guide groove 11 with a hollow structure and the low-voltage sensor 8, it achieves the downward adjustment of the physical position of the induction trigger, breaking the limitation of the setting position of the low-voltage sensor 8.

[0027] When the top of the nail feeder 3 moves to a distance less than the cross-sectional size of a single nail from the top of the nail slot 63, the outer protrusion 32 contacts the sensing contact 82, thereby triggering the low-voltage sensor 8 to send a signal to cut off the driving power of the nail gun and immediately stop the machine. This accurately prevents dry-firing, eliminates wasted nails, and prevents false connections and tightness of the workpiece. Only when a new batch of nails is loaded into the nail magazine and the nail feeder 3 is pressed down will the sensing contact 82 and the outer protrusion 32 separate again. At this point, the low-voltage sensor 8 immediately detects this and sends a signal, thus restoring the normal nailing cycle of the nail gun.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A low-voltage induction anti-dry-firing structure for an electric nail gun, comprising a nail magazine mechanism, the nail magazine mechanism consisting of a left nail magazine (1), a right nail magazine (2), a nail feeder (3), and a nail feed spring (4), wherein the right nail magazine (2) is movably mounted on the left nail magazine (1) and forms a nail storage groove (5) with an upper nail outlet (51) inside both, the nail feeder (3) is disposed in the nail storage groove (5) and can move up and down along the nail storage groove, the nail feed spring (4) is disposed between the nail feeder (3) and the bottom of the nail storage groove (5), and in the initial state the nail feed spring (4) has a pre-compression amount so that the nail feeder (3) always has an upward ejection tendency relative to the nail storage groove (5), characterized in that: A linear guide groove (11) is provided on the inner side wall of the left nail box (1). The linear guide groove (11) is hollowed out near the top of the left nail box (1) and communicates with the outside. A weak current sensor (8) is provided on the outer side wall of the left nail box (1). The sensing contact (82) of the weak current sensor (8) is located above the hollowed-out part of the linear guide groove (11). An external protrusion (32) is provided on the side of the nail feeder (3). The external protrusion (32) extends into the linear guide groove (11). When the external protrusion (32) touches the sensing contact (82), it triggers the weak current sensor (8) to send a signal and cut off the driving power of the nail gun.

2. The low-voltage induction anti-dry-firing structure for an electric nail gun as described in claim 1, characterized in that: The weak current sensor (8) consists of a sensing contact piece (8a) and a plastic insulating sleeve (8b). The sensing contact point (82) is provided at the head of the sensing contact piece (8a), and the tail of the sensing contact piece is electrically connected to the controller of the nail gun through a wire (83).

3. The low-voltage induction anti-dry-firing structure for an electric nail gun as described in claim 1 or 2, characterized in that: The weak current sensor (8) is fixed to the outer wall of the left nail box (1) by screws (81).

4. The low-voltage induction anti-dry-firing structure for an electric nail gun as described in claim 1, characterized in that: The bottom of the nail feeder (3) is provided with an upper connecting seat (31) that is inserted into the top of the nail feeding spring (4).

5. The low-voltage induction anti-dry-firing structure for an electric nail gun as described in claim 1 or 4, characterized in that: The bottom of the nail storage slot (5) is provided with a lower connecting seat (52) that is inserted into the bottom end of the nail feeding spring (4).

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