Eccentric mechanism for jig saw

Abstract

The eccentric mechanism comprises a fixing plate, an eccentric block is arranged on the upper surface of the fixing plate, a protruding block is arranged on one side of the upper surface of the eccentric block, a connecting assembly is arranged on the other side of the upper surface of the eccentric block, a large gear is arranged on the lower surface of the fixing plate, and a rotating rod is arranged on the lower surface of the large gear. The connecting assembly comprises a screw arranged in the eccentric block, a cylindrical pin is arranged in the eccentric block, and the bottom end of the screw and the bottom end of the cylindrical pin both extend into the large gear. According to the eccentric mechanism for the jig saw, due to the arrangement of the cylindrical pin and the screw, the cylindrical pin can be subjected to auxiliary reinforcement on the basis of the screw, and after the cylindrical pin is assembled, the problem of compression of the eccentric block and the large gear is solved through fastening of the screw, and the eccentric mechanism for the jig saw has the structural advantages that under the condition that the die cost of the large gear and the eccentric block is not increased, the machining efficiency is improved; and the service life of the transmission mechanism can be greatly prolonged and the subsequent maintenance cost is reduced only by adding the cylindrical pin, so that the maintenance is relatively convenient.

Description

Technical Field

[0001] This utility model relates to the field of jigsaw technology, and in particular to an eccentric mechanism for jigsaws. Background Technology

[0002] A jigsaw is a tool mainly used for cutting metals and non-ferrous metals. When cutting metal, it has a stronger chip removal capacity. Its working principle is that the motor shaft drives the large gear to rotate in the jigsaw and reciprocating saw mechanism, and then drives the reciprocating rod to move back and forth through the connecting rod on the eccentric block.

[0003] Most existing jigsaw eccentric mechanisms use screws to fasten the transmission gear and eccentric block. However, this threaded installation method inevitably results in gaps, and due to inherent strength limitations, the screws are prone to fatigue and durability issues during prolonged use, leading to failure. Therefore, methods such as increasing the torque when screwing in, using drip-molded screws, or applying thread-locking adhesive during screwing are used for reinforcement. While these methods do improve the fastening of the gear and eccentric block, fatigue and durability issues still arise after prolonged use due to gaps. Furthermore, subsequent repairs are more difficult and troublesome because these methods are used. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides an eccentric mechanism for jigsaws that solves the transmission gap between the gear and the eccentric mechanism by using a cylindrical pin, thereby extending the service life of the transmission mechanism without increasing costs, and also making subsequent maintenance more convenient.

[0005] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, this utility model is implemented through the following technical solution:

[0006] The technical solution of this utility model is: an eccentric mechanism for a jigsaw, including a fixed plate, an eccentric block is provided on the upper surface of the fixed plate, a protrusion is fixedly installed on one side of the upper surface of the eccentric block, a connecting component is provided on the other side of the upper surface of the eccentric block, a large gear is provided on the lower surface of the fixed plate, and a rotating rod is provided on the lower surface of the large gear.

[0007] The connecting assembly includes a screw located inside the eccentric block, and a cylindrical pin located inside the eccentric block and on one side of the screw. The bottom ends of both the screw and the cylindrical pin extend into the interior of the large gear.

[0008] Furthermore, a connecting plate is provided at the bottom of the fixing plate, and fixing bolts are provided on both sides of the connecting plate.

[0009] Furthermore, the upper surface of the fixing plate is provided with a mounting groove, and the lower surface of the eccentric block is provided with a connecting seat that matches the mounting groove. The eccentric block is fixed inside the mounting groove by the connecting seat.

[0010] Furthermore, multiple cylindrical pins are provided, and the multiple cylindrical pins are arranged around the screw inside the eccentric block.

[0011] Furthermore, two cylindrical pins are provided, and the two cylindrical pins form an acute angle with the screw.

[0012] Furthermore, the fixed plate, the large gear, and the eccentric block form an eccentric assembly, and the length of the rotating rod is greater than the thickness of the eccentric assembly.

[0013] Furthermore, the diameter of the rotating rod is smaller than the diameter of the large gear.

[0014] Furthermore, the diameter of the screw is larger than the diameter of the cylindrical pin, and the interior of the eccentric block has a through hole that matches the cylindrical pin.

[0015] Furthermore, the top of the screw has a rotating groove, and the rotating groove is set in an internal hexagonal shape.

[0016] Furthermore, the rear ends of the fixing plate are chamfered on both sides, and the connecting plate is concave.

[0017] The beneficial technical effects of this utility model are as follows: By setting up the cylindrical pin and screw, the screw presses the eccentric block and the large gear together, and one end of the cylindrical pin is tightly fitted with the large gear, so that the cylindrical pin can be used for auxiliary reinforcement on the basis of the screw. After adding the screw and the cylindrical pin, the connection between the eccentric block and the large gear is as convenient as the traditional method, and there will be no situation such as the cylindrical pin getting stuck. After the cylindrical pin is installed, the problem of pressing the eccentric block and the large gear together can be solved by tightening the screw. There is no need to use drip-molded screws or drip-molded thread adhesive when screwing. The advantage of this structure is that without increasing the mold cost of the large gear and the eccentric block, the material cost can be greatly extended by only increasing the cylindrical pin, which can greatly extend the service life of the transmission mechanism and reduce the subsequent maintenance cost. It is also more convenient to maintain. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a bottom view schematic diagram of the structure of the large gear and connecting plate of this utility model;

[0020] Figure 3 This is a front view sectional diagram of the structure of this utility model.

[0021] The numbers and letters in the diagram represent the names of the corresponding components:

[0022] 1. Fixing plate; 11. Connecting plate; 12. Connecting plate; 13. Fixing bolt; 2. Large gear; 3. Rotating rod; 4. Cylindrical pin; 5. Screw; 6. Mounting groove; 7. Protrusion; 8. Eccentric block; 81. Connecting seat. Detailed Implementation

[0023] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0024] See appendix Figures 1-3 As shown, an eccentric mechanism for a jigsaw includes a fixed plate 1. The rear ends of the fixed plate 1 are chamfered on both sides. An eccentric block 8 is provided on the upper surface of the fixed plate 1. A mounting groove 6 is formed on the upper surface of the fixed plate 1. A connecting seat 81, which is adapted to the mounting groove 6, is provided on the lower surface of the eccentric block 8. The eccentric block 8 is fixedly mounted inside the mounting groove 6 via the connecting seat 81. A protrusion 7 is fixedly installed on one side of the upper surface of the eccentric block 8, and a connecting component is provided on the other side of the upper surface of the eccentric block 8. A large gear 2 is provided on the lower surface of the fixed plate 1. The lower surface of 2 is provided with a rotating rod 3. The fixed plate 1, the large gear 2 and the eccentric block 8 form an eccentric assembly. The length of the rotating rod 3 is greater than the thickness of the eccentric assembly, and the diameter of the rotating rod 3 is smaller than the diameter of the large gear 2. When the eccentric mechanism is working, after the rotating rod 3 is connected to the bearing, it can mesh with the large gear 2 through the motor shaft teeth, so that the motor shaft teeth drive the large gear 2 to rotate. Then, the large gear 2 drives the eccentric mechanism to rotate. When rotating, the protrusion 7 on the eccentric block 8 can push the saw blade in the jigsaw to reciprocate.

[0025] The connecting assembly includes a screw 5 located inside the eccentric block 8. The top of the screw 5 has a rotating groove, which is hexagonal in shape. A cylindrical pin 4 is located inside the eccentric block 8 and on one side of the screw 5. The diameter of the screw 5 is larger than the diameter of the cylindrical pin 4. A through hole that matches the cylindrical pin 4 is located inside the eccentric block 8. The bottom ends of both the screw 5 and the cylindrical pin 4 extend into the interior of the large gear 2.

[0026] By setting the connecting component, the cylindrical pin 4 is tightly fitted with the large gear 2 through the press. During assembly, the other end of the cylindrical pin 4 cooperates with the eccentric block 8, achieving the effect of directly fastening the eccentric block 8 and the large gear 2. Moreover, after adding the cylindrical pin 4, the assembly of the eccentric mechanism is as convenient as the traditional method, and there will be no situation such as the cylindrical pin 4 getting stuck. Compared with the traditional method of increasing the torque when driving the screw 5, using drip-molded screws, or adding thread-locking adhesive when driving the screw 5, the cylindrical pin 4 can achieve the same fastening effect and is also simpler to repair after long-term use.

[0027] Furthermore, a connecting plate 11 is provided at the bottom of the fixing plate 1, and fixing bolts 12 are provided on both sides of the connecting plate 11. The connecting plate 11 is concave and has a through groove. The through groove allows the connecting plate 11 to be fitted onto the protrusion on the upper surface of the large gear 2, and cooperates with the fixing plate 1 to be fitted onto the surface of the connecting seat 81. This allows the fixing plate 1 and the connecting plate 11 to fill the gap between the eccentric block 8 and the large gear 2, reducing the gap distance.

[0028] Furthermore, multiple cylindrical pins 4 are provided, and multiple cylindrical pins 4 are arranged around the screw 5 inside the eccentric block 8. There are two cylindrical pins 4, and the two cylindrical pins 4 form an acute angle with the screw 5. Depending on the actual situation, a combination of screw 5 and at least one cylindrical pin 4 can be selectively adopted. When there are two or more cylindrical pins 4, the spacing between the two cylindrical pins 4 can ensure that the force on each cylindrical pin 4 is uniform.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An eccentric mechanism for a jigsaw, characterized in that, include: A fixed plate (1) is provided with an eccentric block (8) on its upper surface. A protrusion (7) is fixedly installed on one side of the upper surface of the eccentric block (8). A connecting component is provided on the other side of the upper surface of the eccentric block (8). A large gear (2) is provided on the lower surface of the fixed plate (1). A rotating rod (3) is provided on the lower surface of the large gear (2). The connecting assembly includes a screw (5) located inside the eccentric block (8), and a cylindrical pin (4) is provided inside the eccentric block (8) and on one side of the screw (5). The bottom ends of both the screw (5) and the cylindrical pin (4) extend into the interior of the large gear (2).

2. The eccentric mechanism for a jigsaw according to claim 1, characterized in that, The bottom of the fixing plate (1) is provided with a connecting plate (11), and fixing bolts (12) are provided on both sides of the connecting plate (11).

3. The eccentric mechanism for a jigsaw according to claim 2, characterized in that, The upper surface of the fixing plate (1) is provided with an installation groove (6), and the lower surface of the eccentric block (8) is provided with a connecting seat (81) that is compatible with the installation groove (6). The eccentric block (8) is fixed inside the installation groove (6) through the connecting seat (81).

4. The eccentric mechanism for a jigsaw according to claim 1, characterized in that, Multiple cylindrical pins (4) are provided, and the multiple cylindrical pins (4) are arranged around the screw (5) inside the eccentric block (8).

5. The eccentric mechanism for a jigsaw according to claim 4, characterized in that, Two cylindrical pins (4) are provided, and an acute angle is formed between the two cylindrical pins (4) and the screw (5).

6. The eccentric mechanism for a jigsaw according to claim 1, characterized in that, The fixed plate (1), the large gear (2) and the eccentric block (8) form an eccentric assembly, and the length of the rotating rod (3) is greater than the thickness of the eccentric assembly.

7. The eccentric mechanism for a jigsaw according to claim 1, characterized in that, The diameter of the rotating rod (3) is smaller than the diameter of the large gear (2).

8. The eccentric mechanism for a jigsaw according to claim 1, characterized in that, The diameter of the screw (5) is larger than the diameter of the cylindrical pin (4), and the eccentric block (8) has a through hole that matches the cylindrical pin (4).

9. The eccentric mechanism for a jigsaw according to claim 1, characterized in that, The top of the screw (5) is provided with a rotating groove, and the rotating groove is set in an internal hexagonal shape.

10. The eccentric mechanism for a jigsaw according to claim 2, characterized in that, The two sides of the rear end of the fixing plate (1) are chamfered, and the connecting plate (11) is concave.

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