Sewing machine with gear adjustment and free adjustment functions

Abstract

The invention discloses a sewing machine with gear adjustment and free adjustment functions, and belongs to the technical field of sewing machines. The gear thread clamping device is mounted on one side of the rack and is used for applying clamping force which changes intermittently to the sewing thread; the free thread clamping device is mounted on one side of the rack and used for applying continuously changing clamping force to the sewing thread; and the switching adjusting mechanism is installed at the top end of the rack, the switching adjusting mechanism is connected with the gear thread clamping device and the free thread clamping device, and the switching adjusting mechanism can enable the gear thread clamping device and the free thread clamping device to alternately clamp the sewing thread. By means of the time division principle, a user can directly switch and use the fabric conforming to the preset clamping force for sewing, and when the user cannot find the preset gear conforming to the fabric, free adjustment of the sewing thread clamping force can be achieved through the free thread clamping device, so that the adjustment efficiency of the sewing thread clamping force is improved, and the user experience is improved. And the dependence on the experience level of debugging personnel is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machines, and in particular to a sewing machine with both gear adjustment and free adjustment. Background Art

[0002] Existing sewing machines use a thread clamp (with a built-in spring to provide elastic pressure) to clamp the suture, so that the other end of the suture generates a certain tension when sewing on the fabric, thereby producing beautiful stitches. During the sewing process, different fabrics have different tension requirements, and the clamping degree of the thread clamp needs to be manually changed.

[0003] In order to adapt to the tension requirements when sewing different fabrics, the adjustment range of the thread screw-in length of the existing thread clamp is set relatively large. When changing different fabrics, it is necessary to repeatedly explore and make multiple adjustments until a beautiful stitch is achieved. Especially when changing fabrics with a large span of fabric properties, it often takes a lot of time to try to adjust the clamping degree, which is not only inefficient, but also requires a high level of experience from the debugging personnel.

[0004] Therefore, how to improve the adjustment efficiency of the suture clamping force by the thread clamp has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a sewing machine with both gear adjustment and free adjustment to solve the above technical problems.

[0006] The technical solution adopted by the present invention is: a sewing machine with both gear adjustment and free adjustment, comprising:

[0007] frame;

[0008] A gear thread clamp, which is installed on one side of the frame and is used to apply an intermittently changing clamping force to the suture;

[0009] A free thread clamp, which is installed on one side of the frame and is used to apply a continuously changing clamping force to the suture;

[0010] A switching adjustment mechanism is installed on the frame, the gear clamp is located on one side of the switching adjustment mechanism, the switching adjustment mechanism is connected to the gear clamp and the free clamp respectively, and the switching adjustment mechanism can make the gear clamp and the free clamp alternately clamp the suture.

[0011] Preferably, the switching adjustment mechanism includes a mounting frame, a switching adjustment shaft and a preset gear wheel, the mounting frame is fixedly mounted on the frame, the switching adjustment shaft is rotatably mounted on one side of the mounting frame, the preset gear wheel is mounted on the switching adjustment shaft, and the working surface of the preset gear wheel is formed with a preset gear section and an adjustment matching section that cooperate with the gear switching shaft of the gear clamp.

[0012] Preferably, a free adjustment wheel is installed on the switching adjustment shaft, and a free adjustment section and a gear matching section are formed on the working surface of the free adjustment wheel, the free adjustment section corresponds to the adjustment matching section, and the gear matching section corresponds to the preset gear section.

[0013] Preferably, the preset gear wheel is coaxially mounted on the switching adjustment shaft, the preset gear segment and the adjustment matching segment are formed on the outer circumferential surface of the preset gear wheel, and the radial dimension of the preset gear segment is smaller than the radial dimension of the adjustment matching segment.

[0014] Preferably, there are multiple preset gear stages, and the multiple preset gear stages are arranged in sequence along the rotation direction of the switching adjustment shaft.

[0015] Preferably, the free adjustment wheel is coaxially mounted on the switching adjustment shaft, the free adjustment section and the gear matching section are formed on the outer circumferential surface of the free adjustment wheel, and the radial dimension of the free adjustment section is smaller than the radial dimension of the gear matching section.

[0016] Preferably, a wire passing plate is fixedly connected to the other side of the mounting frame, a gear wire clamp and a free wire clamp are installed on the wire passing plate, the gear wire clamp comprises a gear switching shaft, a gear reset spring and a gear support pad, and the free wire clamp comprises an adjustment switching shaft, an adjustment reset spring and an adjustment support pad; the gear reset spring and the adjustment reset spring are located on one side of the wire passing plate, and the gear support pad and the adjustment support pad are located on the other side of the wire passing plate;

[0017] The adjusting switch shaft axially passes through the wire-passing plate and is slidably connected to the wire-passing plate along the axial direction, and the adjusting reset spring is connected between one end of the adjusting switch shaft and the wire-passing plate; the gear switching shaft axially passes through the adjusting switch shaft and is slidably connected to the adjusting switch shaft along the axial direction, and the gear reset spring is connected between one end of the gear switching shaft and the wire-passing plate;

[0018] A clamping piece is sleeved on the adjusting switch shaft, the gear support pad is sleeved on the gear switch shaft, and when the gear switch shaft moves axially, the gear support pad can be moved away from or close to the clamping piece. The adjusting support pad is sleeved on the adjusting switch shaft, and when the adjusting switch shaft moves axially, the adjusting support pad can be moved away from or close to the clamping piece.

[0019] Preferably, a guide sleeve is installed on one side of the wire-passing plate, the adjusting switch shaft is axially movable in the guide sleeve, a guide slot is provided on the guide sleeve, an adjusting switch limit pin is provided in the guide slot, and one end of the adjusting switch limit pin is fixedly connected to the adjusting switch shaft;

[0020] The adjustment return spring is accommodated between the guide sleeve and the adjustment switch shaft, one end of the adjustment return spring abuts against the adjustment switch shaft, and one end of the adjustment return spring abuts against the wire passing plate;

[0021] A stop washer is sleeved on the adjusting switch shaft, and the stop washer and the adjusting switch shaft can move relative to each other. A gear switch limit pin is fixedly connected to the gear switch shaft and cooperates with the stop washer to form a stop. One end of the gear switch shaft is formed with an axial sliding groove that cooperates with the gear switch limit pin; the gear reset spring is sleeved on the adjusting switch shaft, one end of the gear reset spring abuts against the stop washer, and the other end of the gear reset spring abuts against the wire plate.

[0022] Preferably, the adjustment support pad is located between the wire clamping plate and the gear support pad, an axial avoidance hole is formed on the adjustment support pad, an axial extrusion plate is formed at one end of the gear support pad, the axial dimension of the axial extrusion plate is larger than the axial dimension of the axial avoidance hole, and the axial extrusion plate is penetrated into the axial avoidance hole.

[0023] Preferably, the other end of the adjustment switching shaft is formed with an adjustment guide slot, the adjustment support pad is sleeved on the adjustment switching shaft, the adjustment guide slider in the inner hole of the adjustment support pad is slidably connected in the adjustment guide slot, and a knob is installed at the end of the gear switching shaft, and an adjustment compression spring is connected between the knob and the adjustment support pad;

[0024] A gear guide groove is formed at the end of the gear switching shaft, the gear support pad is sleeved on the gear switching shaft, and the gear guide slider in the inner hole of the gear support pad is slidably connected in the gear guide groove, and a retaining spring is fixedly connected to the end of the gear switching shaft, and a gear compression spring is connected between the retaining spring and the gear support pad.

[0025] Preferably, the gear support pad is sleeved on the adjustment switching shaft, and the gear guide sliding block in the inner hole of the gear support pad passes through the adjustment guide sliding groove and is slidably connected in the gear guide sliding groove.

[0026] Preferably, the free adjustment wheel is coaxially mounted on the switching adjustment shaft, the free adjustment section and the gear matching section are formed on the end surface of the free adjustment wheel, and the axial spacing between the free adjustment section and the preset gear wheel is smaller than the axial spacing between the gear matching section and the preset gear wheel.

[0027] Preferably, a wire passing plate is fixedly connected to the other side of the mounting frame, and a gear wire clamp is installed on the wire passing plate, and the gear wire clamp comprises a gear switching shaft, a gear return spring, a wire clamp, a gear support pad, a gear compression spring and a retaining spring, one end of the gear switching shaft axially passes through the wire passing plate and is slidably connected to the wire passing plate, the gear return spring is located on one side of the wire passing plate, and the gear return spring is connected between the wire passing plate and the end of the gear switching shaft; the wire clamp, gear support pad, gear compression spring and retaining spring are located on the other side of the wire passing plate, and the two wire clamps are face-to-face mounted on the gear switching shaft, the gear support pad is mounted on the gear switching shaft, a gear guide slot is formed on the gear switching shaft, and the gear guide slider in the inner hole of the gear support pad is slidably connected in the gear guide slot; the retaining spring is fixedly connected to the end of the gear switching shaft, and the gear compression spring is connected between the retaining spring and the gear support pad.

[0028] Preferably, the gear clamp is located above the free clamp, and the switching adjustment mechanism also includes a switching plate, which is located on one side of the free clamp, and the bottom end of the switching plate is connected with a wire loosening claw, and the top end of the switching plate is transmission-connected to the switching adjustment shaft, and when the switching adjustment shaft rotates, it can drive the switching plate to move horizontally and make the wire loosening claw inserted between the two clamping pieces of the free clamp or moved out from between the two clamping pieces of the free clamp.

[0029] Preferably, a trigger plate capable of moving along the axial direction of the switching adjustment shaft is installed above the mounting frame, a roller is installed at one end of the trigger plate, the roller abuts against the working end surface of the free adjustment wheel, and the other end of the trigger plate is fixedly connected to the top end of the switching plate.

[0030] Preferably, a guide shaft is installed on the other side of the mounting frame, the guide shaft is arranged parallel to the switching adjustment shaft, and the guide shaft is slidably connected to the mounting frame, the other end of the trigger plate is fixedly connected to the guide shaft, and the top of the switching plate is fixedly connected to the guide shaft; an axis shift reset spring is sleeved on the guide shaft, one end of the axis shift reset spring abuts against the mounting frame, and the other end of the axis shift reset spring abuts against the switching plate.

[0031] Beneficial effects of the present invention:

[0032] The present invention utilizes the time division principle, applies a preset clamping force to the suture through the gear clamp, realizes the gear adjustment of the suture clamping force, applies a continuously changing clamping force to the suture through the free clamp, realizes the free adjustment of the suture clamping force, cooperates with the switching adjustment mechanism to control the gear clamp and the free clamp to clamp the suture alternately, so that the user can directly switch to use the fabric that matches the preset clamping force for sewing. At the same time, when the user cannot find the preset gear that matches the fabric, the free clamp can be used to realize the free adjustment of the suture clamping force, thereby shortening the adjustment time of the suture clamping degree of commonly used fabrics. For unconventional fabrics, the user can freely adjust the clamping degree of the suture normally, thereby improving the adjustment efficiency of the suture clamping force and reducing the dependence on the experience level of the debugging personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is one of the structural schematic diagrams of the sewing machine with both gear adjustment and free adjustment according to the present invention;

[0034] Figure 2 One of the structural diagrams of the switching adjustment mechanism;

[0035] Figure 3 This is the exploded structural diagram of the gear clamp;

[0036] Figure 4 This is the exploded structure diagram of the free clamp;

[0037] Figure 5 It is one of the three-dimensional schematic diagrams of the free adjustment wheel;

[0038] Figure 6 is a three-dimensional schematic diagram of a preset gear wheel;

[0039] Figure 7 One of the position relationship diagrams of the preset gear wheel and the free adjustment wheel;

[0040] Figure 8 The second structural schematic diagram of the sewing machine with both gear adjustment and free adjustment of the present invention;

[0041] Fig. 9 The second structural diagram of the switching adjustment mechanism;

[0042] Fig.10 It is the exploded structure diagram of the gear clamp and the free clamp;

[0043] Fig.11 It is a schematic diagram of the structure of the gear clamp and the free clamp;

[0044] Fig.12 The second is a three-dimensional schematic diagram of a free adjustment wheel;

[0045] Fig.13 The second diagram is the position relationship diagram of the preset gear wheel and the free adjustment wheel;

[0046] Fig.14 A three-dimensional schematic diagram for adjusting the switching axis;

[0047] Fig.15 A three-dimensional schematic diagram of a guide sleeve;

[0048] Fig.16 is a three-dimensional schematic diagram of the gear shift shaft;

[0049] Fig.17 A three-dimensional schematic diagram of adjusting the support pad;

[0050] Fig.18 It is a three-dimensional schematic diagram of the gear support pad.

[0051] Description of reference numerals in the figures:

[0052] 1. Frame; 2. Gear clamp; 3. Free clamp; 4. Switching adjustment mechanism; 5. Mounting frame; 6. Switching adjustment shaft; 7. Preset gear wheel; 7a. Preset gear section; 7b. Adjustment matching section; 8. Free adjustment wheel; 8a. Free adjustment section; 8b. Gear matching section; 9. Adjustment hand wheel; 9a. Baffle plate; 9b. Hand wheel; 9c. Limiting ball; 9d. Damping spring; 9e. Plug; 9f. Gear slot; 9g. Axial through hole; 10. Roller; 11. Trigger plate; 12. Guide shaft; 13. Shaft shift reset spring; 14. Switching plate; 15. Loose wire claw; 16. Wire passing plate; 17. Gear switching shaft; 17a. Gear retaining ring; 17b. Gear guide slide; 17c. Slot; 18. Gear Return spring; 19, guide sleeve; 19a, disc; 19b, cylinder; 19c, guide slot; 20, gear switching limit pin; 21, buffer pad; 22, clamping piece; 23, gear support pad; 23a, axial extrusion plate; 23b, gear guide slider; 24, gear compression spring; 25, baffle; 26, retaining spring; 27, adjustment switching shaft; 27a, adjustment guide slide groove; 27b, adjustment baffle ring; 27c, mounting hole; 27d, axial slide groove; 28, support cover; 29, adjustment compression spring; 30, positioning piece; 31, knob; 32, adjustment switching limit pin; 33, baffle; 34, adjustment return spring; 35, adjustment support pad; 35a, axial avoidance hole; 35b, adjustment guide slider. DETAILED DESCRIPTION

[0053] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0054] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0057] Examples, such as Figure 1-Figure 18 As shown, a sewing machine with both gear adjustment and free adjustment is provided, and the sewing machine comprises: a frame 1, a gear clamp 2, a free clamp 3 and a switching adjustment mechanism 4.

[0058] The gear thread clamp 2 is installed on one side of the frame 1, and the gear thread clamp 2 is used to apply intermittently changing clamping force to the suture to achieve gear adjustment of the suture clamping force.

[0059] The free thread clamp 3 is installed on one side of the frame 1, and is used to apply a continuously changing clamping force to the suture to achieve free adjustment of the suture clamping force.

[0060] The switching adjustment mechanism 4 is installed at the top of the frame 1, and the gear clamp 2 is located on one side of the switching adjustment mechanism 4. The switching adjustment mechanism 4 is connected to the gear clamp 2 and the free clamp 3 respectively, and the switching adjustment mechanism 4 can make the gear clamp 2 and the free clamp 3 alternately clamp the suture to realize the switching between gear adjustment and free adjustment of the suture clamping force.

[0061] The present invention utilizes the time division principle, applies a clamping force of a preset size to the suture through the gear clamp 2, thereby realizing the gear adjustment of the suture clamping force, applies a continuously changing clamping force to the suture through the free clamp 3, thereby realizing the free adjustment of the suture clamping force, and cooperates with the switching adjustment mechanism 4 to control the gear clamp 2 and the free clamp 3 to clamp the suture alternately, so that the user can directly switch to use the fabric that matches the preset clamping force for sewing. At the same time, when the user cannot find the preset gear that matches the fabric, the free clamp 3 can be used to realize the free adjustment of the suture clamping force, thereby allowing the user to shorten the adjustment time of the suture clamping degree of commonly used fabrics. For unconventional fabrics, the user can freely adjust the clamping degree of the suture normally, thereby improving the adjustment efficiency of the suture clamping force and reducing the dependence on the experience level of the debugging personnel.

[0062] It should be noted that: in the present invention, the horizontal direction and the left-right direction refer to Figure 2 The X-axis direction, longitudinal direction and front-back direction refer to Figure 2 The Y-axis direction, vertical direction and up-down direction refer to Figure 2 The Z-axis direction.

[0063] Specific embodiment 1, as Figure 1-Figure 7 As shown, a sewing machine with both gear adjustment and free adjustment is provided, and the sewing machine comprises: a frame 1, a gear clamp 2, a free clamp 3 and a switching adjustment mechanism 4.

[0064] The switching adjustment mechanism 4 is fixedly mounted on the top of the frame 1 .

[0065] Preferably, Figure 1 and Figure 2 As shown, the switching adjustment mechanism 4 includes a mounting frame 5, a switching adjustment shaft 6 and a preset gear wheel 7. The mounting frame 5 is a U-shaped frame as a whole, and the mounting frame 5 is fixedly installed on the top of the frame 1; the switching adjustment shaft 6 is horizontally arranged in the transverse direction, the switching adjustment shaft 6 is installed on the rear side of the mounting frame 5, and the two ends of the switching adjustment shaft 6 are rotatably connected to the mounting frame 5 through bearings, so that the switching adjustment shaft 6 can rotate around its own axis.

[0066] The number of the preset gear wheels 7 is one or more, and the preset gear wheels 7 are fixedly mounted on the switching adjustment shaft 6, and a preset gear segment 7a and an adjustment matching segment 7b are formed on the working surface of the preset gear wheel 7, that is, a preset gear segment 7a and an adjustment matching segment 7b are formed on the outer circumferential surface of the preset gear wheel 7; one end of the gear switching shaft 17 of the gear clamp 2 abuts against the working surface of the preset gear wheel 7, that is, one end of the gear switching shaft 17 of the gear clamp 2 abuts against the outer circumferential surface of the preset gear wheel 7, so that during the rotation of the preset gear wheel 7, the gear switching shaft 17 can successively contact the preset gear segment 7a and the adjustment matching segment 7b, and the gear switching shaft 17 can move axially by different distances.

[0067] The gear thread clamp 2 is located at the front side of the frame 1, and the gear thread clamp 2 is fixedly mounted on a wire passing plate 16, which is arranged in the transverse direction, and both ends of the wire passing plate 16 are fixedly connected to the mounting frame 5 of the switching adjustment mechanism 4; one end of the gear switching shaft 17 of the gear thread clamp 2 is transmission-connected to the outer circumferential surface of the preset gear wheel 7, so that through the axial movement of the gear switching shaft 17, the gear thread clamp 2 can apply an intermittently changing clamping force to the suture, thereby realizing the gear adjustment of the suture clamping force.

[0068] Preferably, Figure 3 As shown, the gear clamp 2 includes a gear switching shaft 17, a gear reset spring 18, a gear support pad 23, a gear compression spring 24 and a retaining spring 26, wherein the front end of the gear switching shaft 17 extends along the axial direction, and the gear switching shaft 17 passes through the wire plate 16 and is slidably connected with the wire plate 16 along the longitudinal direction, that is, the front end of the gear switching shaft 17 is correspondingly located on the front side of the wire plate 16, and the rear end of the gear switching shaft 17 is correspondingly located on the rear side of the wire plate 16.

[0069] The gear reset spring 18 is located at the rear side of the wire-passing plate 16, and the gear reset spring 18 is connected between the wire-passing plate 16 and the end of the gear switching shaft 17, that is, the gear reset spring 18 is sleeved on the gear switching shaft 17, and one end of the gear reset spring 18 abuts against the wire-passing plate 16, and the other end of the gear reset spring 18 abuts against the gear retaining ring 17a on the gear switching shaft 17, so that the gear switching shaft 17 can move backward in the longitudinal direction after the external force is removed.

[0070] A wire clamping piece 22 is installed on the front side of the wire passing plate 16 , and two wire clamping pieces 22 are sleeved on the gear shifting shaft 17 face to face.

[0071] The gear support pad 23, the gear compression spring 24 and the retaining spring 26 are located on the front side of the wire-passing plate 16, the gear support pad 23 is sleeved on the gear switching shaft 17, and the wire clamping piece 22 is located between the gear support pad 23 and the wire-passing plate 16; a gear guide slot 17b is formed on the gear switching shaft 17, and the gear guide slot 17b is formed on the gear switching shaft 17 along the longitudinal direction, that is, the gear guide slot 17b is formed on the gear switching shaft 17 along the axial direction of the gear switching shaft 17, and a gear guide slider 23b matching the gear guide slot 17b is formed in the inner hole of the gear support pad 23, and the gear guide slider 23b is slidably connected to the gear guide slot 17b. It is connected in the gear guide slot 17b so that the gear support pad 23 and the gear switching shaft 17 can move relative to each other in the axial direction of the gear switching shaft 17, and prevent the gear support pad 23 and the gear switching shaft 17 from rotating relative to each other in the circumferential direction of the gear switching shaft 17, and after the gear switching shaft 17 moves toward the front end more than a certain distance along the axial direction, the gear guide slider 23b abuts against the rear end of the gear guide slot 17b, so that the gear switching shaft 17 can push the gear support pad 23 to move in the direction away from the clamping piece 22, thereby making the gear clamp 2 invalid, that is, the two clamping pieces 22 of the gear clamp 2 do not apply clamping force to the suture.

[0072] The retaining spring 26 is fixedly connected to the end of the gear switching shaft 17, and the gear compression spring 24 is connected between the retaining spring 26 and the gear support pad 23, that is, one end of the gear compression spring 24 abuts against the retaining spring 26, and the other end of the gear compression spring 24 abuts against the gear support pad 23, so that the gear support pad 23 moves backward along the gear switching shaft 17 and applies pressure to the clamping piece 22, so that the two clamping pieces 22 apply a clamping force to the suture. When the gear support pad 23 squeezes the clamping piece 22, the relative position of the gear support pad 23 and the clamping piece 22 is fixed. Therefore, the gear switching shaft 17 can be controlled to move backward a predetermined distance along the axial direction, so that the gear compression spring 24 undergoes corresponding elastic deformation and applies a corresponding pressure to the gear support pad 23, thereby causing the two clamping pieces 22 to apply a predetermined clamping force to the suture, thereby realizing the gear adjustment of the suture clamping force.

[0073] Specifically, a slot 17c is provided at the front end of the gear switching shaft 17, and the retaining spring 26 is fixedly installed in the slot 17c; a baffle 25 is provided on the side of the retaining spring 26 facing the gear support pad 23, and the baffle 25 is sleeved on the gear switching shaft 17, and one end of the gear compression spring 24 is in contact with the baffle 25.

[0074] More preferably, the number of the gear position wire clamps 2 is one or more. When the number of the gear position wire clamps 2 is multiple, the multiple gear position wire clamps 2 are spaced apart in the transverse direction and fixedly connected to the wire passing plate 16 .

[0075] The free thread clamp 3 is fixedly mounted on the front side of the frame 1 and is located below the gear thread clamp 2. The free thread clamp 3 can apply a continuously changing clamping force to the suture to achieve free adjustment of the suture clamping force.

[0076] The free wire clamp 3 can adopt any known structure, and the following is only an exemplary description of one of them in detail:

[0077] like Figure 4 As shown, the free wire clamp 3 includes a buffer pad 21, a wire clamping piece 22, an adjustment switch shaft 27, a support cover 28, an adjustment compression spring 29, a positioning piece 30 and a knob 31; wherein the adjustment switch shaft 27 is arranged along the longitudinal direction, and the rear end of the adjustment switch shaft 27 can be fixedly connected to the frame 1, and the buffer pad 21, the wire clamping piece 22, the support cover 28, the adjustment compression spring 29 and the positioning piece 30 are sequentially sleeved on the adjustment switch shaft 27.

[0078] There are two thread clamping pieces 22, and the two thread clamping pieces 22 are face-to-face sleeved on the adjustment switching shaft 27; there are two buffer pads 21, and the thread clamping piece 22 is located between the two buffer pads 21; one end of the adjustment compression spring 29 abuts against the positioning member 30, and the other end of the adjustment compression spring 29 abuts against the buffer pad 21, and the support cover 28 is sleeved on the outside of the adjustment compression spring 29. The knob 31 is threadedly connected to the front end of the adjustment switching shaft 27, so that the compression deformation of the adjustment compression spring 29 is changed by rotating the knob 31 on the adjustment switching shaft 27, so as to achieve the adjustment of the clamping force of the suture by the two thread clamping pieces 22.

[0079] Preferably, an adjustment guide groove 27a is formed on the adjustment switching shaft 27, and a connecting slider (not shown in the figure) is formed in the inner hole of the positioning member 30, and the connecting slider is slidably connected in the adjustment guide groove 27a; a stationary gear plate is formed at one end of the positioning member 30 facing the knob 31, and a movable gear plate is formed at one end of the knob 31 facing the positioning member 30, and the movable gear plate and the stationary gear plate are meshed with each other.

[0080] It should be noted that: providing a stationary gear disc on the positioning member 30 and providing a movable gear disc on the knob 31 belong to the prior art and will not be described in detail here.

[0081] The switching adjustment mechanism 4 is connected to the free thread clamp 3, and the switching adjustment mechanism 4 can make the gear thread clamp 2 and the free thread clamp 3 clamp the suture alternately, so as to realize the switching between gear adjustment and free adjustment of the suture clamping force.

[0082] Preferably, Figure 2 and Figure 5As shown, the switching adjustment mechanism 4 also includes a free adjustment wheel 8 and a switching plate 14. The free adjustment wheel 8 is coaxially installed on the switching adjustment shaft 6. The free adjustment wheel 8 is an end face cam, and a free adjustment section 8a and a gear matching section 8b are formed on the end face of the free adjustment wheel 8. In the circumferential direction of the switching adjustment shaft 6, the free adjustment section 8a corresponds to the adjustment matching section 7b, and the gear matching section 8b corresponds to the preset gear section 7a.

[0083] Specifically, the free adjustment wheel 8 is coaxially mounted in the middle of the switching adjustment shaft 6, and in the circumferential direction of the switching adjustment shaft 6, the working end surface of the free adjustment wheel 8 includes a free adjustment section 8a and an adjustment matching section 8b, and the free adjustment section 8a and the adjustment matching section 8b are fixedly connected at both ends. The axial dimensions of the free adjustment wheel 8 corresponding to the free adjustment section 8a and the adjustment matching section 8b are different; for example, Figure 5 In the embodiment, the axial dimension of the free adjusting wheel 8 corresponding to the adjusting fitting section 8b is greater than the axial dimension of the free adjusting wheel 8 corresponding to the free adjusting section 8a.

[0084] The switching plate 14 is arranged at the front side of the frame 1 in the vertical direction, and a wire loosening claw 15 is fixedly connected to the bottom end of the switching plate 14. The wire loosening claw 15 is located on one side of the free clamp 3, such as Figure 2 The top end of the switching plate 14 is connected to the switching adjustment shaft 6 in a transmission manner, and when the switching adjustment shaft 6 rotates, it can drive the switching plate 14 to move horizontally, and enable the loosening claw 15 to be inserted between the two clamping pieces 22 of the free clamp 3, or enable the loosening claw 15 to be moved out from between the two clamping pieces 22 of the free clamp 3, thereby realizing the switching of the free clamp 3.

[0085] Preferably, Figure 2 As shown, the number of the wire loosening claws 15 is one or more, and the wire loosening claws 15 and the free wire clamp 3 are in a one-to-one correspondence. When the number of the wire loosening claws 15 is multiple, the multiple wire loosening claws 15 are staggered in the lateral direction and / or vertical direction.

[0086] It should be noted that the transmission connection between the top of the switching plate 14 and the switching adjustment shaft 6 can adopt any known transmission structure, and the following is only an exemplary description to introduce one of them in detail:

[0087] like Figure 2 As shown, a trigger plate 11 capable of moving along the axial direction of the switching adjustment shaft 6 is installed directly above the mounting frame 5, that is, the trigger plate 11 can move in the lateral direction, and a roller 10 is installed at the rear end of the trigger plate 11, and the roller 10 abuts against the working end surface of the free adjustment wheel 8, and one end of the trigger plate 11 is fixedly connected to the top end of the switching plate 14.

[0088] A guide shaft 12 is installed on the front side of the mounting frame 5, and the guide shaft 12 is arranged parallel to the switching adjustment shaft 6, and the two ends of the guide shaft 12 are slidably connected to the mounting frame 5; the front end of the trigger plate 11 is fixedly connected to the guide shaft 12, and the top end of the switching plate 14 is fixedly connected to the guide shaft 12, and an axial shift reset spring 13 is sleeved on the end of the guide shaft 12, one end of the axial shift reset spring 13 abuts against the mounting frame 5, and the other end of the axial shift reset spring 13 abuts against the switching plate 14, so that the trigger plate 11 can reciprocate along the axial direction of the switching adjustment shaft 6 under the driving force of the free adjustment wheel 8 and the elastic force of the axial shift reset spring 13, thereby realizing the automatic switching of the free clamp 3.

[0089] Preferably, Figure 2 As shown, an adjusting hand wheel 9 is fixedly connected to one end of the switching adjusting shaft 6 , and the adjusting hand wheel 9 can drive the switching adjusting shaft 6 to rotate, and can fix the switching adjusting shaft 6 to the mounting bracket 5 .

[0090] Specifically, the adjusting hand wheel 9 includes a baffle plate 9a, a hand wheel 9b, a limiting ball 9c, a damping spring 9d and a plug 9e; the baffle plate 9a is located at one end of the mounting frame 5, and the baffle plate 9a is coaxially sleeved on the switching adjustment shaft 6, and the baffle plate 9a is fixedly connected to the mounting frame 5. A plurality of gear slots 9f are formed on the baffle plate 9a, and the plurality of gear slots 9f are distributed circumferentially around the axis of the switching adjustment shaft 6; the hand wheel 9b is fixedly connected to one end of the switching adjustment shaft 6, and an axial through hole 9g matching the gear slot 9f is formed on the hand wheel 9b, the plug 9e is fixedly installed in the axial through hole 9g, and the plug 9e is located at the end of the hand wheel 9b away from the baffle plate 9a; the limiting ball 9c is accommodated in the axial through hole 9g, and the limiting ball 9c is located at the end of the hand wheel 9b close to the baffle plate 9a; the damping spring 9d is accommodated in the axial through hole 9 g, and one end of the damping spring 9d is in contact with the plug 9e, and the other end of the damping spring 9d is in contact with the limiting ball 9c, so that when the axial through hole 9g is directly opposite to the gear slot 9f, the limiting ball 9c can enter the gear slot 9f under the action of the damping spring 9d, thereby fixing the adjusting hand wheel 9b and the mounting frame 5 in connection; when the staff turns the hand wheel 9b with force, the limiting ball 9c will compress the damping spring 9d under the action of external force, thereby making the limiting ball 9c enter the axial through hole 9g from the gear slot 9f, so that the adjusting hand wheel 9b and the mounting frame 5 can rotate relative to each other.

[0091] Specific embodiment 2, as Figure 8-Figure 18 As shown, a sewing machine with both gear adjustment and free adjustment is provided, and the sewing machine comprises: a frame 1, a gear clamp 2, a free clamp 3 and a switching adjustment mechanism 4.

[0092] The switch adjustment mechanism 4 is fixedly mounted on the top of the frame 1, and the switch adjustment mechanism 4 is disposed in a lateral direction as a whole.

[0093] Preferably, Figure 6 and 9 As shown, the switching adjustment mechanism 4 includes a mounting frame 5, a switching adjustment shaft 6, a preset gear wheel 7 and a free adjustment wheel 8. The mounting frame 5 is a U-shaped frame as a whole, and the mounting frame 5 is fixedly installed on the top of the frame 1; the switching adjustment shaft 6 is horizontally arranged in the transverse direction, the switching adjustment shaft 6 is installed on the rear side of the mounting frame 5, and the two ends of the switching adjustment shaft 6 are rotatably connected to the mounting frame 5 through bearings, so that the switching adjustment shaft 6 can rotate around its own axis.

[0094] The number of the preset gear wheels 7 is one or more, and the preset gear wheels 7 are fixedly mounted on the switching adjustment shaft 6, and a preset gear segment 7a and an adjustment matching segment 7b are formed on the working surface of the preset gear wheel 7, that is, a preset gear segment 7a and an adjustment matching segment 7b are formed on the outer circumferential surface of the preset gear wheel 7, and the radial dimension of the preset gear segment 7a is smaller than the radial dimension of the adjustment matching segment 7b; one end of the gear switching shaft 17 of the gear clamp 2 abuts against the working surface of the preset gear wheel 7, that is, one end of the gear switching shaft 17 of the gear clamp 2 abuts against the outer circumferential surface of the preset gear wheel 7, so that during the rotation of the preset gear wheel 7, the gear switching shaft 17 can successively contact the preset gear segment 7a and the adjustment matching segment 7b, and make the gear switching shaft 17 axially move different displacements.

[0095] Specifically, the preset gear wheel 7 and the gear clamp 2 are in a one-to-one correspondence. When the number of preset gear wheels 7 is one, an adjustment matching segment 7b and multiple preset gear segments 7a are formed on the outer circumferential surface of the preset gear wheel 7, and the multiple preset gear segments 7a are sequentially distributed along the circumferential direction of the preset gear wheel 7. At the same time, along the rotation direction of the switching adjustment shaft 6, the radial dimensions of the multiple preset gear segments 7a gradually increase, so that the preset gear wheel 7 can rotate smoothly following the switching adjustment shaft 6.

[0096] When there are multiple preset gear wheels 7, the multiple preset gear wheels 7 are spaced apart along the axial direction and fixedly connected to the switching adjustment shaft 6. Correspondingly, the multiple gear clamps 2 are spaced apart along the lateral direction, for example, Figure 8 In the embodiment, the number of the gear clamps 2 is four; an adjustment matching segment 7b and at least one preset gear segment 7a are formed on the outer circumferential surface of each preset gear wheel 7, that is, the number of preset gear segments 7a is one or more.

[0097] Preferably, Figure 6 , Fig. 9 and Fig.12As shown, the preset gear wheel 7 is coaxially installed on the switching adjustment shaft 6, the preset gear segment 7a and the adjustment matching segment 7b are formed on the outer circumferential surface of the preset gear wheel 7, and the radius of the preset gear segment 7a is smaller than the radius of the adjustment matching segment 7b; when the gear switching shaft 17 of the gear clamp 2 abuts against the preset gear segment 7a, the gear switching shaft 17 moves axially a smaller distance, so that the two clamping pieces 22 of the gear clamp 2 apply a clamping force to the suture; when the gear switching shaft 17 of the gear clamp 2 abuts against the adjustment matching segment 7b, the gear switching shaft 17 moves axially a larger distance, so that the two clamping pieces 22 of the gear clamp 2 do not apply a clamping force to the suture.

[0098] The free adjustment wheel 8 is fixedly mounted on the switching adjustment shaft 6, and a free adjustment section 8a and a gear matching section 8b are formed on the working surface of the free adjustment wheel 8, that is, a free adjustment section 8a and a gear matching section 8b are formed on the outer circumferential surface of the free adjustment wheel 8, and in the circumferential direction of the switching adjustment shaft 6, the free adjustment section 8a corresponds to the adjustment matching section 7b, and the gear matching section 8b corresponds to the preset gear section 7a.

[0099] Specifically, Fig. 9 and Fig.12 As shown, the free adjustment wheel 8 is coaxially installed in the middle of the switching adjustment shaft 6, and in the circumferential direction of the switching adjustment shaft 6, the outer circumferential surface of the free adjustment wheel 8 includes a free adjustment section 8a and an adjustment matching section 8b, and the free adjustment section 8a and the adjustment matching section 8b are fixedly connected at both ends. The radial dimensions of the free adjustment section 8a and the adjustment matching section 8b are different, for example, Fig.12 In the embodiment, the radial dimension of the free adjustment section 8a is smaller than the radial dimension of the adjustment fitting section 8b.

[0100] The gear clamp 2 and the free clamp 3 are located on the front side of the frame 1, and the gear clamp 2 and the free clamp 3 are connected to the switching adjustment mechanism 4. The gear clamp 2 can apply an intermittently changing clamping force to the suture to achieve gear adjustment of the suture clamping force, and the free clamp 3 can apply a continuously changing clamping force to the suture to achieve free adjustment of the suture clamping force, and the switching adjustment mechanism 4 can make the gear clamp 2 and the free clamp 3 alternately clamp the suture to achieve switching between gear adjustment and free adjustment of the suture clamping force.

[0101] Preferably, Figure 8 and Fig. 9 As shown, a wire passing plate 16 is fixedly connected to the front of the mounting frame 5, and a gear clamp 2 and a free clamp 3 are installed on the wire passing plate 16. The free clamp 3 is sleeved on the outside of the gear clamp 2, or the free clamp 3 and the gear clamp 2 are coaxially arranged.

[0102] Specifically, Figure 10-Figure 18As shown, the gear clamp 2 and the gear clamp 2 include a gear switching shaft 17, a gear reset spring 18 and a gear support pad 23, and the free clamp 3 includes an adjustment switching shaft 27, an adjustment reset spring 34 and an adjustment support pad 35; the gear reset spring 18 and the adjustment reset spring 34 are both located on the rear side of the wire passing plate 16, and the gear support pad 23 and the adjustment support pad 35 are both located on the front side of the wire passing plate 16.

[0103] The front end of the adjustment switching shaft 27 extends in the front-to-back direction, the adjustment switching shaft 27 axially passes through the wire-passing plate 16 and is slidably connected with the wire-passing plate 16 in the front-to-back direction, and the adjustment return spring 34 is connected between one end of the adjustment switching shaft 27 and the wire-passing plate 16, that is, the adjustment return spring 34 is sleeved on the adjustment switching shaft 27, and one end of the adjustment return spring 34 abuts against the wire-passing plate 16, and the other end of the adjustment return spring 34 abuts against the end of the adjustment switching shaft 27.

[0104] The gear switching shaft 17 axially penetrates the adjusting switching shaft 27 and is slidably connected with the adjusting switching shaft 27 along the axial direction, that is, the interior of the adjusting switching shaft 27 is hollow and forms a through hole extending in the longitudinal direction (not shown in the figure), and the through hole is coaxially arranged with the adjusting switching shaft 27, and the middle part of the gear switching shaft 17 is penetrated in the through hole of the adjusting switching shaft 27, and the two ends of the gear switching shaft 17 extend out from the through hole, and the gear switching shaft 17 can reciprocate in the longitudinal direction in the through hole of the adjusting switching shaft 27; the gear reset spring 18 is connected between one end of the gear switching shaft 17 and the wire plate 16, that is, the gear reset spring 18 is sleeved on the gear switching shaft 17, and one end of the gear reset spring 18 abuts against the wire plate 16, and the other end of the gear reset spring 18 abuts against the end of the gear switching shaft 17.

[0105] Specifically, Fig.10 and 15 As shown, a guide sleeve 19 is installed on the rear side of the wire-passing plate 16, and the guide sleeve 19 is arranged in the longitudinal direction, and the guide sleeve 19 includes a disc portion 19a and a cylindrical portion 19b which are vertically fixedly connected, the disc portion 19a is fixedly connected to the wire-passing plate 16, and the coaxial sleeve of the adjusting switch shaft 27 which can move axially is arranged in the cylindrical portion 19b; a guide slot 19c is opened on the cylindrical portion 19b, and the slot length direction of the guide slot 19c is the longitudinal direction, and an adjusting switch limit pin 32 is arranged in the guide slot 19c, and one end of the adjusting switch limit pin 32 is fixedly connected to the adjusting switch shaft 27, so that the adjusting switch shaft 27 and the guide sleeve 19 are slidably connected in the axial direction of the guide sleeve 19, and prevent the adjusting switch shaft 27 and the guide sleeve 19 from rotating relative to each other in the circumferential direction of the guide sleeve 19.

[0106] The adjustment return spring 34 is accommodated between the guide sleeve 19 and the adjustment switching shaft 27 , one end of the adjustment return spring 34 abuts against the adjustment retaining ring 27 b at the end of the adjustment switching shaft 27 , and one end of the adjustment return spring 34 abuts against the wire plate 16 .

[0107] A stop washer 33 is sleeved on the end of the adjusting switch shaft 27, and the stop washer 33 and the adjusting switch shaft 27 can move relative to each other. A gear switch limit pin 20 is fixedly connected to the gear switch shaft 17 to form a stop with the stop washer 33. The gear switch limit pin 20 is arranged along the radial direction of the gear switch shaft 17, and one end of the gear switch shaft 17 is formed with an axial groove 27d that cooperates with the gear switch limit pin 20, that is, the gear switch limit pin 20 is located in the axial groove 27d, so that the adjusting switch shaft 27 and the gear switch shaft 17 are slidably connected in the axial direction of the guide sleeve 19, and the adjusting switch shaft 27 and the gear switch shaft 17 are prevented from rotating relative to each other in the circumferential direction of the guide sleeve 19.

[0108] The gear position return spring 18 is sleeved on the adjustment switch shaft 27 , and one end of the gear position return spring 18 abuts against the stop pad 33 , and the other end of the gear position return spring 18 abuts against the wire plate 16 .

[0109] A wire clamping piece 22 is installed on the front side of the wire passing plate 16 , and two wire clamping pieces 22 are sleeved on the adjustment switch shaft 27 face to face.

[0110] Preferably, Fig.10 and Fig.11 As shown, there are two wire clamping pieces 22, and the two wire clamping pieces 22 are face-to-face mounted on the adjustment switching shaft 27, and a buffer pad 21 is installed between the wire clamping piece 22 and the wire passing plate 16, and a buffer pad 21 is installed between the wire clamping piece 22 and the adjustment support pad 35. The buffer pad 21 is mounted on the adjustment switching shaft 27, and the buffer pad 21 and the adjustment switching shaft 27 can move relative to each other in the axial direction, so that the axial force acts more evenly on the two wire clamping pieces 22.

[0111] The gear support pad 23 is sleeved on the gear switching shaft 17, and when the gear switching shaft 17 moves axially, the gear support pad 23 can be moved away from or close to the clamping plate 22. The adjustment support pad 35 is sleeved on the adjustment switching shaft 27, and when the adjustment switching shaft 27 moves axially, the adjustment support pad 35 can be moved away from or close to the clamping plate 22.

[0112] Preferably, Fig.10 , Figure 14-Figure 18As shown, the adjustment support pad 35 is located between the clamping plate 22 and the gear support pad 23, an axial avoidance hole 35a is formed on the adjustment support pad 35, an axial extrusion plate 23a is formed at one end of the gear support pad 23, the axial dimension of the axial extrusion plate 23a is larger than the axial dimension of the axial avoidance hole 35a, and the axial extrusion plate 23a is inserted into the axial avoidance hole 35a, and the adjustment support pad 35 and the gear support pad 23 are set at a distance.

[0113] An adjusting guide slot 27a is formed at the other end of the adjusting switching shaft 27, and an adjusting support pad 35 is sleeved on the adjusting switching shaft 27. An adjusting guide slider 35b in the inner hole of the adjusting support pad 35 is slidably connected in the adjusting guide slot 27a, and a knob 31 is provided at the end of the gear switching shaft 17. An adjusting compression spring 29 is connected between the knob 31 and the adjusting support pad 35, that is, one end of the adjusting compression spring 29 abuts against the knob 31, and the other end of the adjusting compression spring 29 abuts against the adjusting support pad 35, so as to apply a continuously changing clamping force to the clamping plate 22 through the elastic deformation of the adjusting compression spring 29 and the adjusting support pad 35.

[0114] Specifically, as shown in the figure, a positioning member 30 is installed between the knob 31 and the adjusting compression spring 29, and the positioning member 30 is coaxially sleeved on the gear switching shaft 17, and the positioning member 30 and the gear switching shaft 17 can move relative to each other along the axial direction; the positioning member 30 is generally in the shape of a cone with one end thick and the other end thin, and the large diameter end of the positioning member 30 faces the adjusting support pad 35, and the adjusting compression spring 29 is installed between the adjusting support pad 35 and the positioning member 30, that is, one end of the adjusting compression spring 29 abuts against the adjusting support pad 35, and the other end of the adjusting compression spring 29 abuts against the positioning member 30.

[0115] The small diameter end of the positioning member 30 faces the knob 31, and a stationary gear disc is formed at the small diameter end of the positioning member 30, and a movable gear disc is formed at one end of the knob 31 close to the positioning member 30. The movable gear disc meshes with the stationary gear disc to prevent the knob 31 from loosening under vibration.

[0116] A connecting slider is formed in the inner hole of the positioning member 30, and the connecting slider is slidably connected in the gear guide groove 23b of the gear switching shaft 17, so that the positioning member 30 and the gear switching shaft 17 are slidably connected in the axial direction and prevent the positioning member 30 and the gear switching shaft 17 from rotating relative to each other in the circumferential direction.

[0117] A gear guide slot 17b is formed at the end of the gear switching shaft 17, the gear support pad 23 is sleeved on the gear switching shaft 17, and the gear guide slider 23b in the inner hole of the gear support pad 23 is slidably connected in the gear guide slot 17b, and a retaining spring 26 is fixedly connected to the end of the gear switching shaft 17, and a gear compression spring 24 is connected between the retaining spring 26 and the gear support pad 23, that is, one end of the gear compression spring 24 abuts on the retaining spring 26, and the other end of the gear compression spring 24 abuts on the gear support pad 23, so as to apply an intermittently changing clamping force to the clamping plate 22 through the elastic deformation of the gear compression spring 24 and the gear support pad 23.

[0118] More preferably, the gear support pad 23 is coaxially sleeved on the adjustment switching shaft 27, and the gear guide slider 23b in the inner hole of the gear support pad 23 passes through the adjustment guide slot 27a and is slidably connected in the gear guide slot 17b to reduce the axial size of the gear clamp 2.

[0119] The working process of the sewing machine with both gear adjustment and free adjustment of the present invention is as follows:

[0120] When the gear clamp 2 is used to adjust the gear of the suture, the preset gear segment 7a of the preset gear wheel 7 is rotated to the position of abutting the gear switching shaft 17 of the gear clamp 2 by rotating the switching adjustment shaft 6. At this time, the gear switching shaft 17 moves axially to the set position (there is a gap between the gear support pad 23 and the adjustment support pad 35), and the axial extrusion plate 23a of the gear support pad 23 contacts the buffer pad 21, and the gear compression spring 24, under the action of the retaining spring 26, will cause the gear compression spring 24 to produce a certain amount of compression accordingly, and exert pressure on the buffer pad 21 through the gear support pad 23, so that the two clamping plates 22 generate corresponding clamping forces on the suture. Therefore, by presetting multiple axial positions of the gear switching shaft 17, the gear support pad 23 can generate clamping forces of different sizes on the suture, thereby realizing the gear adjustment of the preset clamping force of the clamp.

[0121] At the same time, the rotation of the switching adjustment shaft 6 will cause the gear matching section 8b of the free adjustment wheel 8 to rotate to the position abutting against the adjustment switching shaft 27 of the free clamp 3. At this time, the adjustment switching shaft 27 is axially ejected to the limit position, so that the adjustment guide slider 35b of the adjustment support pad 35 abuts against one end of the adjustment guide slide groove 27a of the adjustment switching shaft 27, that is, the adjustment support pad 35 moves toward the knob 31 under the ejection action of the adjustment switching shaft 27, so that a gap appears between the adjustment support pad 35 and the buffer pad 21, that is, the elastic force of the adjustment compression spring 29 cannot act on the buffer pad 21, and the adjustment compression spring 29 fails; or under the action of the free adjustment wheel 8, the wire loosening claw 15 at the bottom end of the switching plate 14 is inserted between the two clamping pieces 22 of the free clamp 3, thereby making the free clamp 3 fail.

[0122] When the free thread clamp 3 is used to freely adjust the suture, the adjustment matching section 7b of the preset gear wheel 7 is rotated to the position of abutting the gear switching shaft 17 of the gear thread clamp 2 by rotating the switching adjustment shaft 6, thereby axially ejecting the gear switching shaft 17 to the limit position, so that the gear guide slider 23b of the gear support pad 23 abuts against one end of the gear guide slot 23b of the gear switching shaft 17, that is, the gear support pad 23 moves toward the knob 31 under the ejection action of the gear switching shaft 17, so that a gap appears between the axial extrusion plate 23a of the gear support pad 23 and the buffer pad 21, that is, the elastic force of the gear compression spring 24 cannot act on the buffer pad 21, and the gear compression spring 24 fails.

[0123] At the same time, the rotation of the switching adjustment shaft 6 will cause the free adjustment section 8a of the free adjustment wheel 8 to rotate to the position abutting the adjustment switching shaft 27 of the free clamp 3. At this time, the adjustment switching shaft 27 moves axially to a predetermined position, so that the adjustment support pad 35 contacts the buffer pad 21 under the action of the adjustment compression spring 29, and the adjustment support pad 35 can move back and forth axially on the adjustment switching shaft 27, that is, the elastic force of the adjustment compression spring 29 acts on the clamping piece 22, and the compression amount of the adjustment compression spring 29 can be changed by changing the screw-in length of the knob 31 on the gear switching shaft 17, thereby adjusting the pressure of the adjustment support pad 35 on the clamping piece 22, thereby realizing free adjustment of the clamping force of the clamp; or, under the action of the free adjustment wheel 8, the loose wire claw 15 at the bottom end of the switching plate 14 is pulled out from between the two clamping pieces 22 of the free clamp 3, so that the free clamp 3 clamps the suture.

[0124] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sewing machine with both gear adjustment and free adjustment, characterized in that: include: Rack (1); A gear thread clamp (2), the gear thread clamp (2) being mounted on one side of the frame (1) and being used for applying an intermittently changing clamping force to the suture; A free thread clamp (3), which is mounted on one side of the frame (1) and is used to apply a continuously changing clamping force to the suture; A switching adjustment mechanism (4) is installed on the frame (1), the switching adjustment mechanism (4) is connected to the gear clamp (2) and the free clamp (3) respectively, and the switching adjustment mechanism (4) can make the gear clamp (2) and the free clamp (3) clamp the suture alternately.

2. A sewing machine with both gear adjustment and free adjustment according to claim 1, characterized in that: The switching adjustment mechanism (4) comprises a mounting frame (5), a switching adjustment shaft (6) and a preset gear wheel (7); the mounting frame (5) is fixedly mounted on the frame (1); the switching adjustment shaft (6) is rotatably mounted on one side of the mounting frame (5); the preset gear wheel (7) is mounted on the switching adjustment shaft (6); and a preset gear section (7a) and an adjustment matching section (7b) that match the gear switching shaft (17) of the gear clamp (2) are formed on a working surface of the preset gear wheel (7).

3. A sewing machine with both gear adjustment and free adjustment according to any one of claim 2, characterized in that: A free adjustment wheel (8) is mounted on the switching adjustment shaft (6); a free adjustment section (8a) and a gear matching section (8b) are formed on the working surface of the free adjustment wheel (8); the free adjustment section (8a) corresponds to the adjustment matching section (7b), and the gear matching section (8b) corresponds to the preset gear section (7a).

4. A sewing machine with both gear adjustment and free adjustment according to claim 3, characterized in that: The preset gear wheel (7) is coaxially mounted on the switching adjustment shaft (6); the preset gear segment (7a) and the adjustment matching segment (7b) are formed on the outer circumferential surface of the preset gear wheel (7); and the radial dimension of the preset gear segment (7a) is smaller than the radial dimension of the adjustment matching segment (7b).

5. A sewing machine with both gear adjustment and free adjustment according to claim 4, characterized in that: The number of the preset gear segments (7a) is plural, and along the rotation direction of the switching adjustment shaft (6), the plurality of preset gear segments (7a) are arranged in sequence.

6. A sewing machine with both gear adjustment and free adjustment according to claim 3, characterized in that: The free adjustment wheel (8) is coaxially mounted on the switching adjustment shaft (6); the free adjustment section (8a) and the gear matching section (8b) are formed on the outer circumferential surface of the free adjustment wheel (8); and the radial dimension of the free adjustment section (8a) is smaller than the radial dimension of the gear matching section (8b).

7. A sewing machine with both gear adjustment and free adjustment according to any one of claims 3 to 6, characterized in that: The other side of the mounting frame (5) is fixedly connected to a wire passing plate (16), on which a gear clamp (2) and a free wire clamp (3) are mounted, wherein the gear clamp (2) comprises a gear switching shaft (17), a gear reset spring (18) and a gear support pad (23), and the free wire clamp (3) comprises an adjustment switching shaft (27), an adjustment reset spring (34) and an adjustment support pad (35); the gear reset spring (18) and the adjustment reset spring (34) are located on one side of the wire passing plate (16), and the gear support pad (23) and the adjustment support pad (35) are located on the other side of the wire passing plate (16); The adjusting switch shaft (27) axially penetrates the wire-passing plate (16) and is slidably connected to the wire-passing plate (16) along the axial direction, and the adjusting reset spring (34) is connected between one end of the adjusting switch shaft (27) and the wire-passing plate (16); the gear position switching shaft (17) axially penetrates the adjusting switch shaft (27) and is slidably connected to the adjusting switch shaft (27) along the axial direction, and the gear position reset spring (18) is connected between one end of the gear position switching shaft (17) and the wire-passing plate (16); A clamping piece (22) is sleeved on the adjustment switching shaft (27), the gear support pad (23) is sleeved on the gear switching shaft (17), and when the gear switching shaft (17) moves axially, the gear support pad (23) can be moved away from or close to the clamping piece (22), and the adjustment support pad (35) is sleeved on the adjustment switching shaft (27), and when the adjustment switching shaft (27) moves axially, the adjustment support pad (35) can be moved away from or close to the clamping piece (22).

8. A sewing machine with both gear adjustment and free adjustment according to claim 7, characterized in that: A guide sleeve (19) is installed on one side of the wire-passing plate (16), and the adjustment switch shaft (27) is sleeved in the guide sleeve (19) so as to be axially movable. A guide slot (19c) is provided on the guide sleeve (19), and an adjustment switch limit pin (32) is provided in the guide slot (19c). One end of the adjustment switch limit pin (32) is fixedly connected to the adjustment switch shaft (27); The adjustment return spring (34) is accommodated between the guide sleeve (19) and the adjustment switch shaft (27), one end of the adjustment return spring (34) abuts against the adjustment switch shaft (27), and one end of the adjustment return spring (34) abuts against the wire passing plate (16); The regulating switch shaft (27) is sleeved with a stop washer (33), and the stop washer (33) and the regulating switch shaft (27) can move relative to each other; the gear switch shaft (17) is fixedly connected with a gear switch limit pin (20) that cooperates with the stop washer (33) to form a stop; one end of the gear switch shaft (17) is formed with an axial sliding groove (27d) that cooperates with the gear switch limit pin (20); the gear reset spring (18) is sleeved on the regulating switch shaft (27), one end of the gear reset spring (18) is in contact with the stop washer (33), and the other end of the gear reset spring (18) is in contact with the wire plate (16).

9. A sewing machine with both gear adjustment and free adjustment according to claim 7, characterized in that: The adjustment support pad (35) is located between the clamping plate (22) and the gear support pad (23); an axial avoidance hole (35a) is formed on the adjustment support pad (35); an axial extrusion plate (23a) is formed at one end of the gear support pad (23); the axial dimension of the axial extrusion plate (23a) is greater than the axial dimension of the axial avoidance hole (35a), and the axial extrusion plate (23a) is inserted into the axial avoidance hole (35a).

10. A sewing machine with both gear adjustment and free adjustment according to claim 7, characterized in that: The other end of the adjustment switching shaft (27) is formed with an adjustment guide slot (27a), the adjustment support pad (35) is sleeved on the adjustment switching shaft (27), the adjustment guide slider (35b) in the inner hole of the adjustment support pad (35) is slidably connected in the adjustment guide slot (27a), and a knob (31) is installed at the end of the gear switching shaft (17), and an adjustment compression spring (29) is connected between the knob (31) and the adjustment support pad (35); The end of the gear switching shaft (17) is formed with a gear guide slot (17b), the gear support pad (23) is sleeved on the gear switching shaft (17), and the gear guide slider (23b) in the inner hole of the gear support pad (23) is slidably connected in the gear guide slot (17b), the end of the gear switching shaft (17) is fixedly connected with a retaining spring (26), and a gear compression spring (24) is connected between the retaining spring (26) and the gear support pad (23).

11. A sewing machine with both gear adjustment and free adjustment according to claim 10, characterized in that: The gear support pad (23) is sleeved on the adjustment switching shaft (27), and the gear guide sliding block (23b) in the inner hole of the gear support pad (23) passes through the adjustment guide sliding groove (27a) and is slidably connected in the gear guide sliding groove (17b).

12. A sewing machine with both gear adjustment and free adjustment according to claim 3, characterized in that: The free adjustment wheel (8) is coaxially mounted on the switching adjustment shaft (6); the free adjustment section (8a) and the gear matching section (8b) are formed on the end surface of the free adjustment wheel (8); and the axial spacing between the free adjustment section (8a) and the preset gear wheel (7) is smaller than the axial spacing between the gear matching section (8b) and the preset gear wheel (7).

13. A sewing machine with both gear adjustment and free adjustment according to any one of claim 12, characterized in that: The other side of the mounting frame (5) is fixedly connected to a wire passing plate (16), on which a gear clamp (2) is installed, the gear clamp (2) comprising a gear switching shaft (17), a gear reset spring (18), a wire clamp (22), a gear support pad (23), a gear compression spring (24) and a retaining spring (26), one end of the gear switching shaft (17) axially passes through the wire passing plate (16) and is slidably connected to the wire passing plate (16), the gear reset spring (18) is located on one side of the wire passing plate (16), and the gear reset spring (18) is connected between the wire passing plate (16) and the end of the gear switching shaft (17); the wire clamp (22 ), a gear support pad (23), a gear compression spring (24) and a retaining spring (26) are located on the other side of the wire-passing plate (16); the two clamping plates (22) are sleeved on the gear switching shaft (17) face to face; the gear support pad (23) is sleeved on the gear switching shaft (17); a gear guide slide groove (17b) is formed on the gear switching shaft (17); a gear guide slider (23b) in the inner hole of the gear support pad (23) is slidably connected in the gear guide slide groove (17b); the retaining spring (26) is fixedly connected to the end of the gear switching shaft (17); the gear compression spring (24) is connected between the retaining spring (26) and the gear support pad (23).

14. A sewing machine with both gear adjustment and free adjustment according to claim 12, characterized in that: The gear position wire clamp (2) is located above the free wire clamp (3), and the switching adjustment mechanism (4) further comprises a switching plate (14), the switching plate (14) is located on one side of the free wire clamp (3), the bottom end of the switching plate (14) is connected with a wire loosening claw (15), the top end of the switching plate (14) is transmission-connected with a switching adjustment shaft (6), and when the switching adjustment shaft (6) rotates, it can drive the switching plate (14) to move horizontally and enable the wire loosening claw (15) to be inserted between the two wire clamping pieces (22) of the free wire clamp (3) or to be moved out from between the two wire clamping pieces (22) of the free wire clamp (3).

15. A sewing machine with both gear adjustment and free adjustment according to claim 14, characterized in that: A trigger plate (11) is mounted above the mounting frame (5) and is movable along the axis of the switching adjustment shaft (6). A roller (10) is mounted on one end of the trigger plate (11), and the roller (10) abuts against the working end surface of the free adjustment wheel (8). The other end of the trigger plate (11) is fixedly connected to the top end of the switching plate (14).

16. A sewing machine with both gear adjustment and free adjustment according to claim 15, characterized in that: A guide shaft (12) is installed on the other side of the mounting frame (5), the guide shaft (12) is arranged parallel to the switching adjustment shaft (6), and the guide shaft (12) is slidably connected to the mounting frame (5), the other end of the trigger plate (11) is fixedly connected to the guide shaft (12), and the top end of the switching plate (14) is fixedly connected to the guide shaft (12); an axial shift reset spring (13) is sleeved on the guide shaft (12), one end of the axial shift reset spring (13) is in contact with the mounting frame (5), and the other end of the axial shift reset spring (13) is in contact with the switching plate (14).

Images