Presser foot driving mechanism

Abstract

The utility model discloses a presser foot driving mechanism which comprises a presser foot lever, a driving source, a connecting rod assembly and a machine head shell. A mounting shaft for positioning a presser foot lever is arranged at a corresponding position of a machine head shell, the mounting shaft forms a lever fulcrum of the presser foot lever, an eccentric shaft part eccentrically arranged on the mounting shaft is arranged at the fulcrum of the mounting shaft, and the presser foot lever is provided with a fulcrum hole matched with the eccentric shaft part. The eccentric shaft part on the mounting shaft can be located at different heights by rotating and adjusting the angle of the mounting shaft, so that the presser foot lever matched with the eccentric shaft part is driven to be located at different heights, that is, the presser foot lever can rotate along with the mounting shaft to adjust the height of the presser foot lever, and therefore the presser foot has a wider height adjusting range relatively; the presser foot driving mechanism is simple in structure, a large height adjusting range of the presser foot can be achieved and increased through simple adjustment of the installation shaft, and compared with an existing presser foot structure, the presser foot driving mechanism can better adapt to a relatively large cloth thickness range.

Description

Technical Field

[0001] The utility model relates to a presser foot driving mechanism. Background Art

[0002] The presser foot of the embroidery machine is used to assist the needle bar embroidery.

[0003] The presser foot of the existing embroidery machine is connected to the necessary connecting rod to drive the presser foot through the presser foot cam of the main shaft or an independent motor, so that the presser foot cooperates with the needle bar to realize embroidery. In actual embroidery work, the embroidery fabrics have different thicknesses. The existing presser foot will be elastically set in the working position to adapt to the thickness of the fabric through its own elastic deformation. However, the range of the elastically set presser foot to adapt to the thickness of the fabric is ultimately limited. It is only designed according to the needs of the elasticity of the presser foot that can adapt to the embroidery fabric within a certain thickness range. For fabrics with thickness outside this range, it is difficult to embroider thick or thin fabrics. Summary of the invention

[0004] The utility model solves the problems existing in the prior art in use and provides a presser foot driving mechanism which has a simple structure and can effectively adjust the presser foot height and improve and expand the adaptability of the presser foot.

[0005] The technical solution of the utility model to solve the existing problems is: a presser foot driving mechanism, including a presser foot lever for driving the presser foot, a driving source for driving the presser foot, a connecting rod assembly connected to the driving source to transmit power to the presser foot lever, and a machine head shell for positioning and installation. As an improvement, the machine head shell is provided with a mounting shaft that can position the presser foot lever, the mounting shaft can be rotatably positioned and installed at a corresponding position of the machine head shell, the mounting shaft constitutes the fulcrum of the presser foot lever, the mounting shaft is provided at the fulcrum with an eccentric shaft portion eccentrically arranged on the mounting shaft and can adjust the height of the presser foot lever with the rotation of the mounting shaft, and the presser foot lever is provided with a fulcrum hole matched with the eccentric shaft portion. The above-mentioned mounting shaft is provided with a positioning structure for positioning and maintaining the state of the mounting shaft.

[0006] As a further improvement, a driving groove for rotatably mounting the shaft is provided on one side or both sides of the mounting shaft.

[0007] As a further improvement, one side or both sides of the installation shaft are provided with an adjusting ratchet.

[0008] As a further improvement, the head housing is provided with an adjustment scale at the adjustment ratchet wheel.

[0009] As a further improvement, the adjusting ratchet is provided with a ratchet baffle for stopping the ratchet from reversing; the ratchet baffle is fixedly mounted on the machine head housing and cooperates with the ratchet.

[0010] As a further improvement, the ratchet baffle is an elastic baffle.

[0011] As a further improvement, it also includes a ratchet cover plate arranged on the head housing, the ratchet cover plate is provided with an adjustment groove concentric with the adjustment ratchet, and the ratchet is provided with a locking nut that cooperates with the adjustment groove to lock the adjustment ratchet.

[0012] As a further improvement, it also includes a ratchet cover plate arranged on the head housing, the ratchet cover plate is provided with a plurality of adjustment holes evenly arranged in a full circle or evenly arranged in an arc shape on the ratchet cover plate, the axis of the evenly arranged plurality of adjustment holes is concentric with the adjustment ratchet, and the ratchet is provided with a locking nut which cooperates with the adjustment hole to lock the adjustment ratchet.

[0013] As a further improvement, the installation shaft is located on one side through the eccentric shaft portion to the side of the adjusting ratchet, and the outer diameter of the shaft decreases stepwise.

[0014] As a further improvement, the driving source is an independent driving motor, a presser foot driving cam installed on the driving shaft, or a presser foot driving eccentric wheel installed on the driving shaft.

[0015] Compared with the prior art, the utility model is provided with a mounting shaft rotatably mounted on the corresponding part of the machine head housing to position the presser foot lever, the mounting shaft constitutes the lever fulcrum of the presser foot lever, an eccentric shaft portion eccentrically arranged on the mounting shaft is provided at the fulcrum of the mounting shaft, and a fulcrum hole matched with the eccentric shaft portion is provided on the presser foot lever. The angle of the mounting shaft can be adjusted by rotation, so that the eccentric shaft portion on the mounting shaft is at different heights, thereby driving the presser foot lever matched with the eccentric shaft portion to be at different heights, that is, the presser foot lever can adjust the height of the presser foot lever as the mounting shaft rotates, so that the presser foot has a relatively wider height adjustment range, which is suitable for working at different working heights. The beneficial effect is that the structure of the presser foot driving mechanism is simple, and a larger height adjustment range of the presser foot can be achieved and increased by simply adjusting the mounting shaft, and it can be more suitable for a relatively larger range of cloth thicknesses than the existing presser foot structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a presser foot driving mechanism installed on a machine head.

[0017] Figure 2 yes Figure 1 An enlarged schematic diagram of point a.

[0018] Figure 3 The utility model is a side view schematic diagram of the presser foot driving mechanism installed on the machine head.

[0019] Figure 4 The utility model is an exploded schematic diagram showing that the presser foot driving mechanism is installed on the machine head.

[0020] Figure 5This is a side view schematic diagram of the application of the presser foot mechanism of the utility model

[0021] Figure 6 It is a schematic diagram of the presser foot mechanism of the utility model.

[0022] Figure 7 It is a side view of the presser foot mechanism of the utility model in one direction.

[0023] Figure 8 It is a side perspective view of the presser foot mechanism of the utility model from another direction.

[0024] Fig. 9 This is a schematic diagram of the presser foot mechanism installation shaft and presser foot lever.

[0025] Presser foot lever 1, connecting rod assembly 2, large connecting rod 21, small connecting rod 22, driving arm 23, transmission arm 24, machine head housing 3, mounting shaft 4, eccentric shaft 41, driving groove 42, adjusting ratchet 5, scale 51, ratchet baffle 52, adjusting groove 53, ratchet cover 6. DETAILED DESCRIPTION

[0026] See also Figure 1-9 The present embodiment provides a presser foot driving mechanism, comprising a presser foot lever 1 for driving the presser foot, a driving source for driving the presser foot, a connecting rod assembly 2 for connecting the driving source to transmit power to the presser foot lever 1, and a machine head housing 3 for positioning. The machine head housing 3 is provided with a mounting shaft 4 for positioning the presser foot lever 1. The mounting shaft 4 is rotatably mounted at a corresponding position of the machine head housing 3. The mounting shaft 4 constitutes a fulcrum of the presser foot lever 1. The mounting shaft 4 is provided at the fulcrum with an eccentric shaft portion 41 eccentrically arranged on the mounting shaft 4, which can adjust the height of the presser foot lever 1 as the mounting shaft 4 rotates. The presser foot lever 1 is provided with a fulcrum hole matched with the eccentric shaft portion 41. When the presser foot needs to be adjusted in height according to the thickness of the fabric, the height of the presser foot lever 1 is changed by rotating the mounting shaft 4 and the eccentric shaft portion 41 eccentrically arranged on the mounting shaft 4, so that the presser foot lever 1 is positioned at this height and can maintain a working state. The setting of the eccentric shaft portion 41 can meet the requirements of the existing embroidery machine for the fabric thickness.

[0027] When in use, both ends of the mounting shaft 4 can be positioned in the machine head housing 3 , and one end thereof can be arranged in a rotating circle for easy rotation, and the rotating circle is mounted on the machine head housing 3 .

[0028] The mounting shaft 4 can be mounted on the machine head housing 3 through a thread or a mounting hole. In order to maintain the stability of the mounting shaft 4 in adjusting the presser foot lever 1, preferably, the mounting shaft is provided with a positioning structure for positioning and maintaining the state of the mounting shaft. The positioning structure can be a locking nut, a locking bolt, a pin shaft, or other prior art structures for locking and adjusting the mounting shaft 4.

[0029] In the utility model, the driving source and the connecting rod assembly 2 can adopt the existing technical structure. As described, the driving source can be an independent driving motor, a presser foot driving cam installed on the driving shaft, or a presser foot driving eccentric wheel installed on the driving shaft. In this embodiment, the cam-driven connecting rod assembly 2 can be adopted. The connecting rod assembly 2 includes a large connecting rod 21 and a small connecting rod 22 that are movably connected to each other. The rotation fulcrum of the large connecting rod 21 is arranged on the head housing 3, and the large connecting rod 21 is provided with a driving arm 23 connected to the driving cam on one side of the rotation fulcrum, and a transmission arm 24 matched with the small connecting rod 22 is provided on the other side of the rotation fulcrum, and the small connecting rod 22 that movably connects the corresponding end of the large connecting rod 21 with the corresponding end of the presser foot lever 1.

[0030] The driving cam may be provided with a cam groove, and the cam groove drives the corresponding roller on the driving arm 23 of the large connecting rod 21. Referring to the attached drawings, the driving cam in this embodiment is an external cam with two outer contours, and the two external cams are installed on a driving shaft, and the large connecting rod 21 is driven by the two external cams. The two external cams, the driving arm 23 of the large connecting rod 21 is respectively provided with a first arm that cooperates with a cam, and a second arm that cooperates with a second cam, and rollers that cooperate with the external cams may be provided on the first and second arms. Among them, a cam that cooperates with the first arm drives the first arm to drive the large connecting rod 21 to rotate in one direction around the rotation fulcrum through the driving arm 23, and another cam that cooperates with the second arm drives the second arm to rotate the large connecting rod 21 around the rotation fulcrum in another direction through the driving arm 23. The two cams installed on a driving shaft alternately cooperate with the first and second arms, thereby alternately driving the large connecting rod to rotate back and forth around the rotation fulcrum, thereby driving the presser foot lever 1 through the small connecting rod 22 to realize the action of driving the presser foot. Usually, cam surfaces that alternately cooperate with the corresponding first arms and second arms are provided on the two cams to realize driving of the large connecting rod 21 .

[0031] Of course, if necessary, the driving source and the connecting rod assembly 2 can adopt other existing technical structures, specifically to facilitate driving the presser foot lever 1.

[0032] In order to facilitate adjustment, one or both sides of the installation shaft 4 are provided with a driving slot 42 for rotating the installation shaft 4. The rotation angle position of the installation shaft 4 can be adjusted through the driving slot 42.

[0033] Further, one or both sides of the mounting shaft 4 are provided with an adjusting ratchet 5. The head housing 3 is provided with an adjusting scale 51 at the adjusting ratchet 5. The adjusting scale 51 can facilitate timely observation of the height position of the presser foot.

[0034] The adjusting ratchet 5 is provided with a ratchet baffle 52 for stopping the ratchet from reversing; the ratchet baffle 52 is fixedly mounted on the machine head housing 3 and cooperates with the ratchet. The ratchet baffle 52 is an elastic baffle. The ratchet baffle 52 cooperates with the ratchet to smoothly adjust the stability of the ratchet and to stop the ratchet after the angle position is adjusted. The ratchet baffle 52 cooperates with the adjusting ratchet 5 to form a positioning structure for the mounting shaft 4.

[0035] It also includes a ratchet cover plate 6 disposed on the machine head housing 3, the ratchet cover plate 6 is provided with an adjustment groove 53 concentric with the adjustment ratchet, and the ratchet is provided with a locking nut that cooperates with the adjustment groove 53 to lock the adjustment ratchet 5. The locking nut can be loosened to slide the adjustment nut in the adjustment groove 53, thereby rotating the adjustment ratchet 5, and the locking nut is adjusted to an appropriate position to tighten the locking nut, so that the locking nut locks the ratchet cover plate 6 and the adjustment ratchet 5. The adjustment groove 53 and the locking nut cooperate to further form a positioning structure for the installation shaft 4. The adjustment scale 51 can be provided on the ratchet cover plate 6.

[0036] It also includes a ratchet cover plate 6 disposed on the head housing 3, and the ratchet cover plate 6 is provided with a plurality of adjustment holes evenly arranged in a full circle or in an arc shape, and the axis of the evenly arranged adjustment holes is concentric with the adjustment ratchet, and the ratchet is provided with a locking nut that cooperates with the adjustment hole to lock the adjustment ratchet 5. The adjustment hole and the locking nut cooperate to further form a positioning structure for the installation shaft 4. The adjustment principle of the adjustment hole is similar to the adjustment principle of the adjustment slot 53.

[0037] In order to facilitate the installation of the installation shaft 4, the installation shaft 4 is located on one side through the eccentric shaft portion 41 to the side of the adjusting ratchet 5, and the outer diameter of the shaft is gradually reduced in a stepped manner, which can facilitate the rapid insertion and installation of the installation shaft.

Claims

1. A presser foot driving mechanism, comprising a presser foot lever for driving the presser foot, a driving source for driving the presser foot, a connecting rod assembly for connecting the driving source to transmit power to the presser foot lever, and a machine head housing for positioning and installation, characterized in that: The machine head housing is provided with a mounting shaft for positioning the presser foot lever. The mounting shaft can be rotatably positioned and installed at a corresponding position of the machine head housing. The mounting shaft constitutes a fulcrum of the presser foot lever. The mounting shaft is provided at the fulcrum with an eccentric shaft portion eccentrically arranged on the mounting shaft and can adjust the height of the presser foot lever as the mounting shaft rotates. The presser foot lever is provided with a fulcrum hole that cooperates with the eccentric shaft portion.

2. The presser foot driving mechanism according to claim 1, characterized in that: One side or both sides of the installation shaft are provided with a driving groove for rotating the installation shaft.

3. The presser foot driving mechanism according to claim 1, characterized in that: One side or both sides of the installation shaft are provided with an adjusting ratchet.

4. The presser foot driving mechanism according to claim 3, characterized in that: The head housing is provided with an adjustment scale at the adjustment ratchet wheel.

5. The presser foot driving mechanism according to claim 3, characterized in that: The regulating ratchet is provided with a ratchet baffle for stopping the ratchet from reversing; the ratchet baffle is fixedly mounted on the machine head housing and cooperates with the ratchet; the ratchet baffle is an elastic baffle.

6. The presser foot driving mechanism according to claim 1, characterized in that: The installation shaft is provided with a positioning structure for positioning and maintaining the state of the installation shaft.

7. The presser foot driving mechanism according to claim 3, characterized in that: It also includes a ratchet cover plate arranged on the machine head housing, the ratchet cover plate is provided with an adjustment groove concentric with the adjustment ratchet, and the ratchet is provided with a locking nut that cooperates with the adjustment groove to lock the adjustment ratchet.

8. The presser foot driving mechanism according to claim 3, characterized in that: It also includes a ratchet cover plate arranged on the head housing, the ratchet cover plate is provided with a plurality of adjustment holes evenly arranged in a full circle or in an arc shape on the ratchet cover plate, the axis of the evenly arranged plurality of adjustment holes is concentric with the adjusting ratchet, and the ratchet is provided with a locking nut which cooperates with the adjusting hole to lock the adjusting ratchet.

9. The presser foot driving mechanism according to claim 3, characterized in that: The installation shaft is located on one side through the eccentric shaft portion to the side of the adjusting ratchet wheel, and the outer diameter of the shaft is gradually reduced in a step-like manner.

10. The presser foot driving mechanism according to claim 1, characterized in that: The driving source is an independent driving motor, a presser foot driving cam installed on the driving shaft, or a presser foot driving eccentric wheel installed on the driving shaft.

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