Driving device capable of adjusting height of feed dog

Abstract

The utility model relates to a driving device capable of adjusting the height of a feed dog, which comprises a driving connecting rod, an eccentric connecting rod, a pushing connecting rod, a connecting rod and a feed dog support, and further comprises an eccentric cam, the eccentric cam is composed of an outer eccentric cam and an inner eccentric cam, the outer eccentric cam is fixedly connected with a bearing, and the inner eccentric cam is eccentrically arranged in the outer eccentric cam. The inner eccentric cam is connected with the driving shaft; different heights of the cloth feeding teeth are achieved by adjusting different angles through the inner eccentric cam, and the problem that in the prior art, sewing and take-up of fabric with different thicknesses are difficult is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sewing machine relates to a driving device that can adjust the height of the feed dog. BACKGROUND

[0002] When the sewing machine works, the fabric is moved uniformly and equidistantly by the pressure of the presser foot and the rhythmic lifting and pulling of the feed dog. The height of the feed dog is usually fixed and cannot be adjusted by the sewing machine when it leaves the factory. Adjusting the height of the feed dog requires corresponding adjustment tools, and the adjustment process is time-consuming and laborious. In addition, the height of the feed dog is difficult to control. When sewing thick materials, the sewing machine without height adjustment of the feed dog will have insufficient feed dog stroke height, poor take-up effect, and even the height of the raised feed dog will fall within the deformation range of the fabric, resulting in separation of the upper layer of the multi-layer thick fabric due to insufficient drag force. Therefore, in general, different sewing machines are selected for different thicknesses of fabric.

[0003] The technical problem to be solved by the utility model is how to overcome the insufficient height of the feed dog, poor take-up, and separation during sewing. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a driving device that can adjust the height of the feed dog, solving the insufficient height of the feed dog, poor take-up, and separation during sewing in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A driving device that can adjust the height of the feed dog, comprising a driving link, an eccentric link, a pushing link, a connecting rod, and a feed dog bracket, the driving link is rotatably connected with the eccentric link, the eccentric link is rotatably connected with the pushing link, the pushing link is rotatably connected with the connecting rod, and the connecting rod is rotatably connected with the feed dog bracket;

[0007] It further comprises a cam, the cam is eccentrically connected with the drive shaft, and the cam is connected with the driving link through a bearing;

[0008] The cam is composed of an outer eccentric cam and an inner eccentric cam, the outer eccentric cam is fixedly connected with the bearing, the inner eccentric cam is eccentrically arranged in the outer eccentric cam, and the inner eccentric cam is eccentrically connected with the drive shaft;

[0009] The outer eccentric cam and the inner eccentric cam are both circular, the outer eccentric cam is provided with a circular mounting cavity, the center of the mounting cavity deviates from the center of the outer eccentric cam, and the center of the mounting cavity is the eccentricity of the outer eccentric cam; the inner eccentric cam is arranged in the mounting cavity; the center of the eccentric connection between the inner eccentric cam and the drive shaft is the eccentricity of the inner eccentric cam;

[0010] The first eccentric position and the second eccentric position of the fixed inner eccentric cam are arranged in the outer eccentric cam, when the inner eccentric cam is fixed in the first eccentric position, the vertical movement of the feed dog support is limited in the first stroke height, when the inner eccentric cam is fixed in the second eccentric position, the vertical movement of the feed dog support is limited in the second stroke height;

[0011] When the inner eccentric cam is in the first eccentric position, the eccentricity of the inner eccentric cam coincides with the eccentricity of the outer eccentric cam, when the inner eccentric cam is in the second eccentric position, the eccentricity of the inner eccentric cam does not coincide with the eccentricity of the outer eccentric cam, and the distance between the two is the difference between the second stroke height and the first stroke height of the vertical movement of the feed dog support.

[0012] The driving connecting rod comprises a bearing mounting portion and a driving arm, bearings are arranged in the bearing mounting portion, the eccentric cam is arranged in the bearings, and the driving arm is connected with the eccentric connecting rod.

[0013] The inner eccentric cam comprises a circular wheel body and a wheel shaft protruding from the surface of the wheel body, the center of the wheel shaft is offset from the center of the wheel body, and the center of the wheel shaft is the eccentricity of the inner eccentric cam; the wheel shaft is connected with the driving shaft.

[0014] The inner eccentric cam is rotated by 90° or 180° or 270° from the first eccentric position to the second eccentric position.

[0015] The edge of the outer eccentric cam is provided with a screw hole penetrating into the mounting cavity, and the inner eccentric cam is fixed in the mounting cavity through the screw hole by a bolt.

[0016] The screw holes are uniformly arranged on the edge of the outer eccentric cam, and two screw holes are arranged.

[0017] The utility model discloses the advantages are as follows: 1, do not change the main structure of the existing sewing machine, realize the adjustable height of feed dog, guarantee the effect of take-up, 2, set up an inner eccentric cam in the outer eccentric cam of prior art, realize the adjustment of the height of feed dog through the position conversion of inner eccentric cam, 3, the position conversion of inner eccentric cam is convenient, easy operation, 4, on the basis of the existing sewing machine structure, only the outer eccentric cam is reformed, the technical transformation cost is low, realizes a sewing machine and can be applicable to the fabric processing of different thickness. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram that the utility model discloses the inner eccentric cam is located first eccentric position;

[0019] Figure 2 It is the structure schematic diagram that the utility model discloses the inner eccentric cam is located second eccentric position;

[0020] Figure 3is a planar section view of the outer eccentric cam of the utility model;

[0021] Figure 4 is a longitudinal section view of the inner eccentric cam of the utility model;

[0022] Figure 5 is a structure schematic view of the driving connecting rod of the utility model.

[0023] In the figure: 1-driving connecting rod;11-bearing mounting portion;12-driving arm;2-eccentric connecting rod;3-pushing connecting rod;4-connecting rod;5-feeding tooth support;6-outer eccentric cam;61-mounting cavity;62-screw hole;7-inner eccentric cam;71-wheel body;72-wheel shaft;8-bearing. DETAILED DESCRIPTION

[0024] The utility model will be further explained in combination with the drawings. The drawings are only used for example explanation, and cannot be understood as the limitation of the patent.

[0025] In order to more simply explain the embodiment, some parts that are well known to those skilled in the art in the drawings or specification, but not related to the main content of the creation, will be omitted. In addition, for the convenience of expression, some parts in the drawings will be omitted, enlarged or reduced, but not represent the size or all structures of actual product.

[0026] The utility model discloses a driving device that can adjust the height of feeding tooth, as shown in Figures 1-5 The utility model discloses a driving device that can adjust the height of feeding tooth, as shown in

[0027] The driving shaft drives the eccentric rotation of the cam, so that the driving connecting rod 1 periodically drives the eccentric connecting rod 2, the pushing connecting rod 3 and the connecting rod 4 to periodically link, and the connecting rod 4 drives the feeding tooth support 5 to periodically move in the horizontal direction and the vertical direction.

[0028] Preferably, as shown in Figure 5 The driving connecting rod 1 includes the bearing mounting portion 11 and the driving arm 12, the bearing 8 is arranged in the bearing mounting portion 11, the cam is arranged in the bearing 8, and the driving arm 12 is connected with the eccentric connecting rod 2. The above is the prior art in the existing sewing machine.

[0029] The eccentric rotation of the cam determines the moving distance of the driving link 1 in the horizontal direction, and the moving distance of the driving link 1 in the horizontal direction determines the lifting height of the feed dog support 5 in the vertical direction through linkage, that is, the moving height of the feed dog support 5 in the vertical direction depends on the moving distance of the driving link 1 in the horizontal direction caused by the eccentric rotation of the cam. Therefore, adjusting the moving height of the feed dog support 5 is to adjust the eccentric connection position of the driving shaft and the cam to adjust the moving distance of the driving link 1 in the horizontal direction.

[0030] Based on this, the utility model discloses in the cam of existing, and creatively sets up one eccentric cam again, and thereby reaches the adjustment driving link 1 horizontal moving distance and then adjusts the moving height of the feed dog support 5 in the vertical direction with the minimum cost on the basis of not changing the other structure of sewing machine.

[0031] As shown in Figure 1 , Figure 2 , the cam is composed of an outer eccentric cam 6 and an inner eccentric cam 7, the outer eccentric cam 6 is fixedly connected with the bearing 8, and the inner eccentric cam 7 is eccentrically arranged in the outer eccentric cam 6 and connected with the driving shaft.

[0032] The first eccentric position and the second eccentric position of the inner eccentric cam 7 are arranged in the outer eccentric cam 6, and the inner eccentric cam 7 rotates 90° or 180° or 270° from the first eccentric position to the second eccentric position.

[0033] As shown in Figure 1 , Figure 3 , the outer eccentric cam 6 and the inner eccentric cam 7 are both circular, the outer eccentric cam 6 is provided with a circular mounting cavity 61, the center of the mounting cavity 61 deviates from the center of the outer eccentric cam 6, and the center of the mounting cavity 61 is the eccentricity of the outer eccentric cam 6; the inner eccentric cam 7 is arranged in the mounting cavity 61.

[0034] As shown in Figure 4 , the inner eccentric cam 7 includes a circular wheel body 71 and a wheel shaft 72 protruding from the surface of the wheel body 71, the center of the wheel shaft 72 deviates from the center of the wheel body 71, and the center of the wheel shaft 72 is the eccentricity of the inner eccentric cam 7; the wheel shaft 72 is connected with the driving shaft.

[0035] When the inner eccentric cam 7 is in the first eccentric position, the eccentricity of the inner eccentric cam 7 coincides with the eccentricity of the outer eccentric cam 6; when the inner eccentric cam 7 is in the second eccentric position, the eccentricity of the inner eccentric cam 7 does not coincide with the eccentricity of the outer eccentric cam 6; when the inner eccentric cam 7 is fixed in the first eccentric position, the vertical movement of the gripper holder 5 is limited within the first stroke height; when the inner eccentric cam 7 is fixed in the second eccentric position, the rotation of the driving shaft makes the distance of the horizontal movement of the driving link 1 longer, and the vertical movement of the gripper holder 5 is limited within the second stroke height; the distance between the eccentricity of the inner eccentric cam 7 and the eccentricity of the outer eccentric cam 6 is the difference between the second stroke height and the first stroke height of the vertical movement of the gripper holder 5.

[0036] As shown in Figures 1-3 The edge of the outer eccentric cam 6 is provided with the screw hole 62 penetrating to the mounting cavity 61, and the bolt passes through the screw hole 62 to fix the inner eccentric cam 7 in the mounting cavity 61.

[0037] Further, the screw holes 62 are uniformly arranged on the edge of the outer eccentric cam 6, and two screw holes 62 are arranged.

[0038] The above only describes the preferred embodiments of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made according to the content of the present application should be within the technical scope of the present application.

Claims

1. A driving device capable of adjusting the height of a presser foot, comprising a driving link (1), an eccentric link (2), a pushing link (3), a connecting link (4) and a presser foot support (5), the driving link (1) being rotatably connected with the eccentric link (2), the eccentric link (2) being rotatably connected with the pushing link (3), the pushing link (3) being rotatably connected with the connecting link (4), and the connecting link (4) being rotatably connected with the presser foot support (5); further comprising a cam, the cam being eccentrically connected with a driving shaft, and the cam being further connected with the driving link (1) through a bearing (8); the cam is composed of an outer eccentric cam (6) and an inner eccentric cam (7), the outer eccentric cam (6) being fixedly connected with the bearing (8), and the inner eccentric cam (7) being eccentrically arranged in the outer eccentric cam (6), and the inner eccentric cam (7) being eccentrically connected with the driving shaft; the outer eccentric cam (6) and the inner eccentric cam (7) are both circular, the outer eccentric cam (6) is provided with a circular mounting cavity (61), the center of the mounting cavity (61) is offset from the center of the outer eccentric cam (6), and the center of the mounting cavity (61) is the eccentricity of the outer eccentric cam (6); the inner eccentric cam (7) is arranged in the mounting cavity (61); the center of the eccentric connection between the inner eccentric cam (7) and the driving shaft is the eccentricity of the inner eccentric cam (7); the outer eccentric cam (6) is provided with a first eccentric position and a second eccentric position for fixing the inner eccentric cam (7) in the outer eccentric cam (6), when the inner eccentric cam (7) is fixed at the first eccentric position, the vertical movement of the presser foot support (5) is limited within a first stroke height, and when the inner eccentric cam (7) is fixed at the second eccentric position, the vertical movement of the presser foot support (5) is limited within a second stroke height; when the inner eccentric cam (7) is at the first eccentric position, the eccentricity of the inner eccentric cam (7) coincides with the eccentricity of the outer eccentric cam (6); when the inner eccentric cam (7) is at the second eccentric position, the eccentricity of the inner eccentric cam (7) does not coincide with the eccentricity of the outer eccentric cam (6), and the distance between the two is the difference between the second stroke height and the first stroke height of the vertical movement of the presser foot support (5); the driving link (1) comprises a bearing mounting portion (11) and a driving arm (12), the bearing (8) is arranged in the bearing mounting portion (11), the eccentric cam is arranged in the bearing (8), and the driving arm (12) is connected with the eccentric link (2); the inner eccentric cam (7) comprises a circular wheel body (71) and a wheel shaft (72) protruding from the surface of the wheel body (71), the center of the wheel shaft (72) is offset from the center of the wheel body (71), and the center of the wheel shaft (72) is the eccentricity of the inner eccentric cam (7); the wheel shaft (72) is connected with the driving shaft; the inner eccentric cam (7) is rotated by 90°, 180° or 270° from the first eccentric position to the second eccentric position; the edge of the outer eccentric cam (6) is provided with a screw hole (62) penetrating into the mounting cavity (61), and the inner eccentric cam (7) is fixed in the mounting cavity (61) by a bolt passing through the screw hole (62); the screw holes (62) are uniformly arranged on the edge of the outer eccentric cam (6), and two screw holes (62) are arranged. ​ characterized in that ​ ​ ​ ​ 2. The drive arrangement for adjusting the height of the feed dog according to claim 1, characterized in that: ​ 3. The drive arrangement for adjusting the height of the feed dog according to claim 1, wherein: ​ 4. The drive arrangement for adjusting the height of the feed dog according to claim 1, wherein: ​ 5. The drive arrangement for adjusting the height of the feed dog according to claim 1, wherein: ​ 6. The drive arrangement for adjusting the height of the feed dog according to claim 5, wherein: ​

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