Cloth feeding tooth height adjusting device of sewing machine

Abstract

The cloth feeding tooth height adjusting device of the sewing machine comprises a feeding tool mechanism, a feeding tooth adjusting mechanism and an actuator, the feeding tool mechanism comprises a cloth feeding table and cloth feeding teeth, the feeding tooth adjusting mechanism comprises a shaft rod and a rocker arm, and the two ends of the shaft rod are connected with the rocker arm and the cloth feeding table respectively; the actuator comprises a push rod component capable of generating a first moving stroke and a second moving stroke, and the push rod component is connected with the rocker arm; when the push rod component is in a first moving stroke, the rocker arm drives the cloth feeding teeth to form a first tooth feeding height on the needle plate, when the push rod component is in a second moving stroke, the rocker arm drives the cloth feeding teeth to form a second tooth feeding height on the needle plate, and the second tooth feeding height is larger than the first tooth feeding height. Therefore, the gripping force requirements of cloth with different thicknesses can be met, and the sewing quality of sewn clothes is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a feed tooth height adjustment device of sewing machines. Background Art

[0002] The feeding process of the sewing machine is to lift and pull the fabric through the presser foot's pressure and the reciprocating feed teeth, so as to achieve uniform and equidistant forward movement. During the feeding process, the thickness of the fabric is different when the presser foot presses the fabric, and the presser foot pressure is also different. Under the condition that the feeding structure remains unchanged, the greater the presser foot pressure, the greater the friction between the fabric and the needle plate and the presser foot bottom plate during the feeding process, and the feeding process requires a greater gripping force, and then the height of the feed teeth needs to be adjusted according to the thickness of the fabric.

[0003] Generally, the height of the feed teeth is set when the sewing machine leaves the factory. To adjust the height of the feed teeth by yourself, you need the corresponding adjustment tools, and the adjustment process is time-consuming and labor-intensive. In addition, the height of the feed teeth is difficult to control, and users will not adjust the height of the feed teeth by themselves during the sewing process. Therefore, when sewing thick materials, the sewing machine that has not been adjusted for the height of the feed teeth will have insufficient feed teeth height and insufficient cloth gripping force, and even the height of the feed teeth will fall within the deformation range of the fabric, which will eventually cause the upper layer of the thicker multi-layer fabric to be delaminated due to insufficient dragging force.

[0004] Of course, if the feed dog height is not adjusted, it can also be adjusted by reducing the presser foot pressure. However, if the presser foot pressure is artificially reduced to reduce the friction between the sewing material and the needle plate and presser foot base, it will have an adverse effect on feeding, and increase the risk of uneven feeding, difficult feeding or even no feeding of the sewing machine.

[0005] Therefore, how to overcome the aforementioned sewing quality problems such as insufficient feed tooth height, insufficient cloth gripping force and delamination is a technical issue to be solved by the present utility model. Utility Model Content

[0006] An object of the utility model is to provide a feed tooth height adjustment device for a sewing machine, which can be applied to the gripping force requirements of fabrics of various thicknesses, thereby improving the sewing quality of sewn clothes.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a feed tooth height adjustment device for a sewing machine, the sewing machine has a machine base, a main shaft and a needle plate, the needle plate has a plurality of tooth-accommodating grooves, the feed tooth height adjustment device includes a feed mechanism, a feed tooth adjustment mechanism and an actuator, the feed mechanism includes a feed platform and a feed tooth, the main shaft penetrates the machine base and the feed platform, the feed tooth is connected to one end of the feed platform and can move in and out of each tooth-accommodating groove; the feed tooth adjustment mechanism includes a shaft rod and a rocker arm, the shaft rod The two ends are respectively connected to the rocker arm and the other end of the cloth feed platform; the actuator is fixed to the machine base, and the actuator includes a push rod component that can generate a first moving stroke and a second moving stroke, and the push rod component is connected to the rocker arm; wherein when the push rod component is in the first moving stroke, the rocker arm will drive the cloth feed tooth to form a first feeding tooth height on the needle plate, and when the push rod component is in the second moving stroke, the rocker arm will drive the cloth feed tooth to form a second feeding tooth height on the needle plate, and the second feeding tooth height is greater than the first feeding tooth height.

[0008] Among them, the push rod component can also generate a third movement stroke. When the push rod component is in the third movement stroke, the rocker arm will drive the feed tooth to form a third feed tooth height on the needle plate, and the third feed tooth height is smaller than the first feed tooth height.

[0009] The feeding gear adjustment mechanism further comprises a slider and an adjustment member connected to the shaft rod, and the shaft rod is connected to the cloth feeding platform via the slider and the adjustment member.

[0010] The adjusting member includes a first shaft portion and a second shaft portion extending from the first shaft portion. The shaft rod is provided with a shaft connection hole. The first shaft portion penetrates the sliding block, and the second shaft portion penetrates the shaft connection hole.

[0011] Wherein, the axis center line of the first shaft portion coincides with the axis center line of the second shaft portion.

[0012] Wherein, the axis line of the shaft rod and the center line of the shaft connection hole are eccentrically arranged.

[0013] Among them, the feed tooth adjustment mechanism also includes a washer, the cloth feed platform is provided with an opening, the shaft rod extends with a convex shaft, the adjustment member also includes an end extending from the first shaft portion, the washer is sleeved on the convex shaft, the slider is clamped between the end and the washer, and the slider is embedded in the opening.

[0014] Wherein, the shaft rod is provided with a groove at one end away from the adjusting member.

[0015] The actuator further comprises a main body, which is fixed to the base, and the push rod component can be movably connected to the main body.

[0016] The push rod component includes a rod, a stopper and a C-shaped block. The rod is connected to the main body. The stopper is sleeved on a side of the rod adjacent to the main body. The C-shaped block is connected to an end of the rod away from the main body.

[0017] Among them, it also includes a limiting mechanism, which includes a first limiting component and a second limiting component. The first limiting component is fixed to the base and corresponds to the C-shaped block configuration, and the second limiting component is fixed to the main body and corresponds to the stop block configuration.

[0018] One end of the rocker arm has a tightening hole, the other end of the rocker arm is connected to a column, the rocker arm is connected to the shaft through the tightening hole, and the rocker arm is connected to the push rod component through the column.

[0019] The utility model also has the following effects: it can be used on medium-thick fabrics, thick fabrics and thin fabrics, and has a wide range of applications: the overall structure is simple and easy to adjust, and can be realized without the need for professional maintenance technicians.

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an appearance diagram of a sewing machine in which a feed tooth height adjustment device of the utility model is combined with the sewing machine.

[0022] Figure 2 This is an appearance diagram of a feed tooth height adjustment device of a sewing machine according to the utility model combined with a machine base.

[0023] Figure 3 for Figure 2 Another perspective of .

[0024] Figure 4 This is an exploded view of the feeding gear adjustment mechanism of the utility model.

[0025] Figure 5 The utility model is a diagram showing the use status of the feed tooth height adjustment device of the sewing machine applied to medium-thick fabric.

[0026] Figure 6 The utility model is a diagram showing the use status of the feed tooth height adjustment device of a sewing machine applied to thick fabric.

[0027] Figure 7 The utility model is a diagram showing the use status of the feed tooth height adjustment device of a sewing machine applied to thin fabrics.

[0028] Wherein, the reference numerals are:

[0029] 10: Delivery mechanism

[0030] 11: Fabric feeding platform

[0031] 111: Opening

[0032] 12: Feed teeth

[0033] 20: Feeding gear adjustment mechanism

[0034] 21: Axis

[0035] 211: Shaft connection hole

[0036] 212: convex shaft

[0037] 213: screw hole

[0038] 214: Groove

[0039] 22: Rocker arm

[0040] 221: Tightening hole

[0041] 222: Screw

[0042] 223: Column

[0043] 224: Screw

[0044] 225:Roller

[0045] 23: Slider

[0046] 24: Adjustment parts

[0047] 241: End

[0048] 242: First shaft

[0049] 243: Second shaft

[0050] 25: Locking element

[0051] 26: Washer

[0052] 30: Actuator

[0053] 31: Main body

[0054] 32: Push rod component

[0055] 321: Rod

[0056] 322: Stopper

[0057] 323: C-type block

[0058] 40: Limiting mechanism

[0059] 41: First limiting member

[0060] 42: Second limiting member

[0061] H1: First feeding gear height

[0062] H2: Second feeding gear height

[0063] H3: Third feeding gear height

[0064] L1: First moving stroke

[0065] L2: Second moving stroke

[0066] L3: The third moving stroke

[0067] 8: Sewing machine

[0068] 81: Base

[0069] 82: Spindle

[0070] 83: Needle plate

[0071] 831: Tooth groove

[0072] 84: Transmission mechanism DETAILED DESCRIPTION

[0073] The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings. However, the accompanying drawings are only provided for reference and description and are not intended to limit the present invention.

[0074] See also Figures 1 to 4 As shown, the utility model provides a feed tooth height adjustment device for a sewing machine, which is installed on a sewing machine 8. The sewing machine 8 has a machine base 81, a main shaft 82, a needle plate 83, a transmission mechanism 84 and other related components and / or devices. The main shaft 82 passes through the machine base 81, the transmission mechanism 84 is connected to the main shaft 82 and is driven thereby, the needle plate 83 is fixed to the machine base 81 and is provided with a plurality of tooth-accommodating grooves 831 thereon. The structure of this part is the prior art, so it is not described in detail one by one.

[0075] The feed tooth height adjustment device of the utility model mainly comprises a feed mechanism 10 , a feed tooth adjustment mechanism 20 and an actuator 30 .

[0076] The feeding mechanism 10 mainly includes a cloth feeding platform 11 and a cloth feeding tooth 12. The aforementioned main shaft 82 is connected to the middle area of ​​the cloth feeding platform 11. The cloth feeding tooth 12 is connected to the right end of the cloth feeding platform 11 and can move in and out of each tooth-accommodating groove 831. An opening 111 is provided on the left side of the cloth feeding platform 11.

[0077] The feed tooth adjustment mechanism 20 mainly includes a shaft rod 21 and a rocker arm 22 . One end of the shaft rod 21 is connected to an end of the feed platform 11 away from the feed tooth 12 , and the other end of the shaft rod 21 is connected to the rocker arm 22 .

[0078] In one embodiment, the feeding gear adjustment mechanism 20 further includes a slider 23 and an adjustment member 24 , and the shaft 21 is connected to the feeding platform 11 via the slider 23 and the adjustment member 24 .

[0079] In one embodiment, the adjustment member 24 mainly includes an end 241, a first shaft portion 242 and a second shaft portion 243. The first shaft portion 242 extends from the end 241, and the second shaft portion 243 extends from the first shaft portion 242. The diameter of the first shaft portion 242 is greater than the diameter of the second shaft portion 243, and the axis of the first shaft portion 242 coincides with the axis of the second shaft portion 243. An axis connection hole 211 is provided at one end of the shaft rod 21. The center line of the axis connection hole 211 is eccentrically arranged with the axis of the shaft rod 21 (i.e., not on the same straight line), wherein the first shaft portion 242 passes through the center of the slider 23, and the second shaft portion 243 passes through the aforementioned axis connection hole 211 and is fixed.

[0080] In one embodiment, a protruding shaft 212 extends from one end of the shaft 21, and a shaft connection hole 211 is formed in a partial area of ​​the protruding shaft 212 and the shaft 21. In addition, a screw hole 213 is provided at a position of the shaft 21 corresponding to the shaft connection hole 211 for a locking element 25 to pass through and lock.

[0081] In one embodiment, a groove 214 is provided at one end of the shaft 21 away from the adjustment member 24 to provide a hand tool such as a screwdriver to be inserted and rotated. During adjustment, when the shaft 21 is rotated so that its axis is located directly above the center line of the shaft connection hole 211, the slider 23 is located at the lowest point. At this time, one end of the cloth feed platform 11 is pressed down, so that the cloth feed tooth 12 is located at the highest position. Conversely, when the shaft 21 is rotated so that its axis is located directly below the center line of the shaft connection hole 211, the slider 23 is located at the lowest point. At this time, one end of the cloth feed platform 11 is lifted up, so that the cloth feed tooth 12 is located at the lowest position.

[0082] In one embodiment, the rocker arm 22 is connected to one end of the shaft 21 away from the slider 23. One end of the rocker arm 22 has a tightening hole 221. The tightening hole 221 is fixed by a screw 222 passing through the rocker arm 22 so that the tightening hole 221 is tightened in diameter; the other end of the rocker arm 22 is connected to a column 223, and the rocker arm 22 is connected to the shaft 21 through its tightening hole 221.

[0083] In one embodiment, the column 223 includes a screw rod 224 and a roller 225 , and the screw rod 224 passes through the roller 225 and is screwed to the rocker arm 22 .

[0084] In one embodiment, the feed gear adjustment mechanism 20 further includes a washer 26 which is sleeved on the convex shaft 212 . The slider 23 is clamped between the end 241 of the adjustment member 24 and the washer 26 , and the slider 23 is embedded in the opening 111 of the feed platform 11 .

[0085] The actuator 30 is fixed on the aforementioned base 81. The actuator 30 of this embodiment is a pneumatic cylinder, but is not limited to this type. It can also be an actuator device such as an electric cylinder or a hydraulic cylinder. The actuator 30 mainly includes a main body 31 and a push rod component 32 movably connected to the main body 31. The push rod component 32 can generate a first moving stroke L1 and a second moving stroke L2 relative to the main body 31, and the push rod component 32 is connected to the aforementioned rocker arm 22.

[0086] In one embodiment, the push rod component 32 mainly includes a rod 321, a stopper 322 and a C-shaped block 323. The rod 321 is connected to the main body 31, the stopper 322 is sleeved on a side of the rod 321 adjacent to the main body 31, the C-shaped block 323 is connected to an end of the rod 321 away from the main body 31, and the C-shaped block 323 is sleeved on the roller 225 of the aforementioned column 223.

[0087] In one embodiment, the feed tooth height adjustment device of the utility model further includes a limiting mechanism 40, which mainly includes a first limiting member 41 and a second limiting member 42. The first limiting member 41 is fixed to the aforementioned machine base 81 and is configured corresponding to the aforementioned C-shaped block 323. When the C-shaped block 323 is moved to the position of the first limiting member 41 by the rod 321, it is stopped by the first limiting member 41. The second limiting member 42 is fixed to the aforementioned main body 31 and is configured corresponding to the aforementioned stopper 322. When the stopper 322 is moved to the position of the second limiting member 42 by the rod 321, it is stopped by the second limiting member 42.

[0088] See also Figure 5 As shown, when used for sewing medium-thick fabrics, the push rod member 32 will move a first movement stroke L1 from the main body 31. At this time, after the column 223 of the rocker arm 22 is pushed by the C-block 323, the shaft rod 21 will rotate following the rocker arm 22. After the shaft rod 21 rotates, it will drive the slider 23, the feed platform 11 and the feed tooth 12 to produce corresponding position changes, so that the feed tooth 12 forms a first feed tooth height H1 on the needle plate 83. This first feed tooth height H1 is suitable for sewing medium-thick fabrics.

[0089] See also Figure 6 As shown, when sewing thick fabrics, the push rod member 32 will move from the main body 31 to a second movement stroke L2. At this time, after the column 223 of the rocker arm 22 is pushed by the C-block 323, the shaft rod 21 will rotate following the rocker arm 22. After the shaft rod 21 rotates, it will drive the slider 23, the feed platform 11 and the feed tooth 12 to produce corresponding position changes, so that the feed tooth 12 forms a second feed tooth height H2 on the needle plate 83. This second feed tooth height H2 is suitable for sewing thick fabrics, wherein the second feed tooth height H2 is greater than the first feed tooth height H1.

[0090] See also Figure 7As shown, when used for sewing thin fabrics, the push rod member 32 will move from the main body 31 to a third movement stroke L3. At this time, after the column 223 of the rocker arm 22 is pushed by the C-block 323, the shaft rod 21 will rotate following the rocker arm 22. After the shaft rod 21 rotates, it will drive the slider 23, the feed platform 11 and the feed tooth 12 to produce corresponding position changes, so that the feed tooth 12 forms a third feed tooth height H3 on the needle plate 83. This third feed tooth height H3 is suitable for sewing thin fabrics, wherein the third feed tooth height H3 is less than the first feed tooth height H1.

[0091] It is worth mentioning that the first limiting member 41 and the second limiting member 42 are respectively used for providing fine adjustment, and the movement of the push rod member 32 is limited by the change of their positions.

[0092] The above description is only a preferred embodiment of the present utility model and is not intended to limit the patent scope of the present utility model. Other equivalent changes that apply the patent spirit of the present utility model should all fall within the patent scope of the present utility model.

[0093] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A feed tooth height adjustment device for a sewing machine, the sewing machine comprising a machine base, a main shaft and a needle plate, the needle plate having a plurality of tooth-accommodating grooves, characterized in that: The feed tooth height adjustment device comprises: A feeding mechanism, including a cloth feeding platform and a cloth feeding tooth, the main shaft passes through the machine base and the cloth feeding platform, the cloth feeding tooth is connected to one end of the cloth feeding platform and can move in and out of each tooth-containing groove; A feeding gear adjustment mechanism includes a shaft and a rocker arm, wherein two ends of the shaft are respectively connected to the rocker arm and the other end of the feeding platform; and an actuator fixed to the base, the actuator comprising a push rod member capable of generating a first movement stroke and a second movement stroke, the push rod member being connected to the rocker arm; When the push rod component is in the first moving stroke, the rocker arm will drive the feed tooth to form a first feed tooth height on the needle plate. When the push rod component is in the second moving stroke, the rocker arm will drive the feed tooth to form a second feed tooth height on the needle plate, and the second feed tooth height is greater than the first feed tooth height.

2. The feed tooth height adjustment device for a sewing machine according to claim 1, characterized in that: The push rod component can also generate a third movement stroke. When the push rod component is in the third movement stroke, the rocker arm will drive the feed tooth to form a third feed tooth height on the needle plate, and the third feed tooth height is smaller than the first feed tooth height.

3. The feed tooth height adjustment device for a sewing machine according to claim 1, characterized in that: The feeding tooth adjustment mechanism also includes a slider and an adjustment piece connected to the shaft rod, and the shaft rod is connected to the cloth feeding platform through the slider and the adjustment piece.

4. The feed tooth height adjustment device for a sewing machine according to claim 3, characterized in that: The adjusting member includes a first shaft portion and a second shaft portion extending from the first shaft portion. The shaft rod is provided with a shaft connection hole. The first shaft portion penetrates the sliding block, and the second shaft portion penetrates the shaft connection hole.

5. The feed tooth height adjustment device for a sewing machine according to claim 4, characterized in that: The axis center line of the first shaft portion coincides with the axis center line of the second shaft portion.

6. The feed tooth height adjustment device for a sewing machine according to claim 4, characterized in that: The axis center line of the shaft rod and the center line of the shaft connection hole are eccentrically arranged.

7. The feed tooth height adjustment device for a sewing machine according to claim 4, characterized in that: The feed tooth adjustment mechanism also includes a washer, the cloth feed platform is provided with an opening, the shaft rod extends with a convex shaft, the adjustment member also includes an end extending from the first shaft portion, the washer is sleeved on the convex shaft, the slider is clamped between the end and the washer, and the slider is embedded in the opening.

8. The feed tooth height adjustment device for a sewing machine according to claim 3, characterized in that: The shaft rod is provided with a groove at one end away from the adjusting member.

9. The feed tooth height adjustment device for a sewing machine according to claim 1, characterized in that: The actuator further comprises a main body, which is fixed to the base, and the push rod component is movably connected to the main body.

10. The feed tooth height adjustment device for a sewing machine according to claim 9, characterized in that: The push rod component includes a rod, a stopper and a C-shaped block. The rod is connected to the main body. The stopper is sleeved on a side of the rod adjacent to the main body. The C-shaped block is connected to an end of the rod away from the main body.

11. The feed tooth height adjustment device for a sewing machine according to claim 10, characterized in that: It also includes a limiting mechanism, which includes a first limiting component and a second limiting component. The first limiting component is fixed to the base and corresponds to the C-shaped block configuration, and the second limiting component is fixed to the main body and corresponds to the stop block configuration.

12. The feed tooth height adjustment device for a sewing machine according to claim 1, characterized in that: One end of the rocker arm is provided with a tightening hole, and the other end of the rocker arm is connected to a column. The rocker arm is connected to the shaft rod through the tightening hole, and the rocker arm is connected to the push rod component through the column.

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