Presser foot driving mechanism of sewing machine

Abstract

The utility model discloses a presser foot driving mechanism of a sewing machine, which relates to the technical field of sewing machines and comprises a presser foot, a presser foot rod fixed at the top of the presser foot, a connecting rod fixed at the top of the presser foot rod, a connecting plate fixedly connected at the top of the connecting rod, and two symmetrical mounting plates fixedly connected at the top of the connecting plate. The opposite side faces of the two installation plates are rotationally matched with idler wheels, the circumferential side faces of the idler wheels are in sliding fit with cams, one side face of each cam is fixedly connected with a rotating shaft, a worm gear is fixed to the circumferential side face of each rotating shaft, a worm is matched with the circumferential side face of each worm gear in a meshed mode, and a rotary knob is fixed to the bottom of each worm. The worm drives a worm gear meshed with the worm to rotate, the worm gear drives a cam fixedly connected with the worm gear to rotate through a rotating shaft, the profile of the cam pushes a connecting rod to reciprocate up and down through a roller, the connecting rod drives a presser foot rod fixedly connected with the connecting rod to reciprocate up and down, and a presser foot is fixed to the bottom of the presser foot rod; therefore, the vertical position of the presser foot can be adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, in particular to a presser foot driving mechanism of a sewing machine. Background Art

[0002] A sewing machine is a tool used to sew clothes and other textiles. Its working process is to push the cloth forward through the forward and backward movement of the cloth feeding mechanism, and the needle moves the seam thread up and down, cooperating with the shuttle to complete the thread hooking action, and then the thread take-up rod moves up and down to adjust the tightness of the seam thread, and the seam thread is tightened by the thread take-up device to form a stitch. Through these actions coordinated with each other, the continuous sewing function of the sewing machine is realized. Before the needle moves the seam thread up and down, the presser foot is needed to realize the function of pressing and positioning the cloth. The presser foot needs to be lifted once each section of stitch is completed. The common sewing machine completes this action by pushing the machine with human knees, and the pushing action needs to be maintained for a period of time until the adjustment of the cloth position is completed.

[0003] The existing presser foot driving mechanism of the sewing machine usually uses an independent motor-driven connecting rod mechanism to control the presser foot to move up and down, but the space occupied by the mechanism is large, which will increase the size of the sewing machine equipment, and the motor output shaft is locked to ensure that the presser foot does not move. For fabrics of different thicknesses, the height of the presser foot needs to be adjusted by program-controlled motors, which makes the equipment costly and has certain requirements on the professional quality of the user. Therefore, it is suitable for large-scale standardized production operations, but not suitable for household sewing machines. Utility Model Content

[0004] The utility model aims to provide a presser foot driving mechanism for a sewing machine, which solves the problem that the existing presser foot driving mechanism occupies a large space and is not suitable for household sewing machines through the arrangement of a transmission component and a driven component.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] The utility model discloses a presser foot driving mechanism of a sewing machine, comprising a machine casing and a presser foot, a presser foot rod is fixed on the top of the presser foot, and a driven component is arranged on the top of the presser foot rod.

[0007] The driven assembly includes a connecting rod fixedly connected to the top of the presser foot rod, a fixing plate slidingly fitted on the peripheral side of the connecting rod, a spring sleeved and fitted on the peripheral side of the connecting rod is fixedly connected to the top of the fixing plate, a connecting plate is fixedly connected to the top of the connecting rod, one end of the spring is fixedly connected to the bottom of the connecting plate, two symmetrical mounting plates are fixedly connected to the top of the connecting plate, and rollers are fitted to the two mounting plates for rotation relative to one side.

[0008] A transmission assembly is arranged inside the casing, and the transmission assembly includes a cam slidingly fitted on the peripheral side of the roller, one side of the cam is fixedly connected to a rotating shaft rotatably fitted on an inner side of the casing, a worm wheel is fixed to the peripheral side of the rotating shaft, the peripheral side of the worm wheel is meshingly fitted with a worm rotatably fitted on the top of the casing, and a knob is fixed to the bottom of the worm.

[0009] The utility model is further configured that a limiting hole is formed through the top of the fixing plate and is slidably matched with the peripheral side of the connecting rod, and the bottom of the fixing plate is fixedly connected to the bottom of the casing.

[0010] The utility model is further configured that a support hole is penetrated through one side of the two mounting plates, and the rollers are fixedly connected with support shafts rotatably fitted in the support holes on both opposite side surfaces.

[0011] The utility model is further configured such that a component locking assembly is sleeved on the peripheral side surface of the worm gear at the outer bottom of the casing, and the locking assembly includes a locking piece sleeved and fitted on the peripheral side surface of the worm gear, and the locking piece includes a sleeve fixedly connected to the outer bottom of the casing, and a plurality of arc-shaped spring pieces are fixedly connected to the bottom of the sleeve in a circular array, and a limit ring is threadedly connected to the outer peripheral side surface of the sleeve.

[0012] The outer peripheral side of the sleeve is provided with an external thread, and the outer peripheral side of the sleeve is threadedly connected with a collar at the bottom of the limiting ring.

[0013] The utility model is further configured that the top of the knob is fixedly connected with a shaft sleeve which is snap-fitted on the inner side surfaces of a plurality of arc-shaped spring pieces, and the inner peripheral side surface of the shaft sleeve is fixedly connected with the peripheral side surface of the worm.

[0014] The utility model is further configured that a plurality of groups of rubber balls are fixed on the inner sides of a plurality of the arc-shaped spring pieces in a circular array.

[0015] The utility model is further configured that the inner peripheral side surface of the collar is provided with an internal thread.

[0016] The utility model has the following beneficial effects:

[0017] 1. The utility model drives the worm to rotate by turning the knob, and the worm drives the worm wheel meshing with it to rotate, and the worm wheel drives the cam fixedly connected with it through the rotating shaft to rotate, and the cam profile pushes the connecting rod to reciprocate up and down through the roller, and the connecting rod drives the presser foot rod fixedly connected with it to reciprocate up and down, and the presser foot is fixed at the bottom of the presser foot rod, thereby realizing the adjustment of the upper and lower positions of the presser foot, so as to realize the lifting function of the presser foot and realize the fixation of fabrics of different thicknesses.

[0018] 2. The utility model rotates the sleeve ring to make it move up and down on the outer peripheral side of the sleeve. When it moves downward, a plurality of arc-shaped spring pieces fixed to the bottom of the sleeve begin to close together, and the inner side surfaces of the plurality of arc-shaped spring pieces gradually fit with the outer peripheral side surface of the sleeve. The sleeve is locked by the friction force of the two fitting surfaces. Since the inner peripheral side surface of the sleeve is fixedly connected with the peripheral side surface of the worm, the driven component is fixed by fixing the transmission component, and then the upper and lower positions of the presser foot are fixed, ensuring that the presser foot can stably compact the cloth.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The present invention is a structural schematic diagram of a presser foot driving mechanism of a sewing machine.

[0022] Figure 2 An exploded view of the driven component.

[0023] Figure 3 It is a schematic diagram of the structure of the transmission component.

[0024] Figure 4 A cross-sectional view of the locking assembly.

[0025] Figure 5 It is a schematic diagram of the structure of the locking member.

[0026] Figure 6 A cross-sectional view of the collar.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Casing; 2. Presser foot; 3. Presser foot rod; 4. Follower assembly; 401. Connecting rod; 402. Fixing plate; 403. Spring; 404. Connecting plate; 405. Mounting plate; 406. Roller; 407. Limiting hole; 408. Supporting hole; 409. Supporting shaft; 5. Transmission assembly; 501. Cam; 502. Rotating shaft; 503. Worm gear; 504. Worm; 505. Knob; 6. Locking assembly; 601. Sleeve; 602. Arc spring piece; 603. External thread; 604. Ring; 605. Bushing; 606. Rubber ball; 607. Internal thread; 608. Limiting ring; 609. Locking piece. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Specific embodiment 1

[0031] See also Figure 1-6 The utility model is a presser foot driving mechanism of a sewing machine, comprising a casing 1 and a presser foot 2, a presser foot rod 3 is fixed on the top of the presser foot 2, a driven assembly 4 is arranged on the top of the presser foot rod 3, the driven assembly 4 comprises a connecting rod 401 fixedly connected to the top of the presser foot rod 3, a fixing plate 402 is slidably matched with the side surface of the connecting rod 401, a spring 403 sleeved and matched with the side surface of the connecting rod 401 is fixedly connected to the top of the fixing plate 402, a connecting plate 404 is fixedly connected to the top of the connecting rod 401, one end of the spring 403 is fixedly connected to the bottom of the connecting plate 404, and the connecting plate 404 is fixedly connected to the bottom of the connecting plate 404. Two symmetrical mounting plates 405 are fixedly connected to the top of 04, and the two mounting plates 405 are rotatably matched with rollers 406 on opposite sides. A transmission assembly 5 is arranged inside the casing 1, and the transmission assembly 5 includes a cam 501 which is slidably matched on the side surface of the roller 406, and a side surface of the cam 501 is fixedly connected to a rotating shaft 502 which is rotatably matched on an inner side surface of the casing 1, a worm gear 503 is fixed to the side surface of the rotating shaft 502, and a worm 504 which is rotatably matched on the top of the casing 1 is meshed with the side surface of the worm gear 503, and a knob 505 is fixed to the bottom of the worm 504.

[0032] The operation process of this embodiment is as follows: when the presser foot 2 needs to be adjusted in up and down position, the worm 504 fixed thereto is driven to rotate by rotating the knob 505, and the worm 504 then drives the worm wheel 503 meshing therewith to rotate, and the worm wheel 503 drives the cam 501 fixed thereto through the rotating shaft 502 to rotate, and the contour of the cam 501 pushes the mounting plate 405 to reciprocate up and down through the roller 406, and at the same time, the spring 403 is used to ensure that the side surface of the roller 406 is always in contact with the contour of the cam 501, and the mounting plate 405 drives the connecting rod 401 to reciprocate up and down through the connecting plate 404 fixed thereto, and the connecting rod 401 drives the presser foot rod 3 fixed thereto to reciprocate up and down, and the presser foot 2 is fixed at the bottom of the presser foot rod 3, thereby realizing the adjustment of the up and down position of the presser foot 2, so as to realize the lifting and lowering function of the presser foot 2, and realize the fixation of fabrics of different thicknesses. Specific embodiment 2

[0034] See also Figure 1-6On the basis of the first specific embodiment, specifically, a limiting hole 407 is formed through the top of the fixing plate 402 and is slidably fitted on the side surface of the connecting rod 401. The bottom of the fixing plate 402 is fixedly connected to the bottom of the housing 1. Support holes 408 are formed through one side surface of the two mounting plates 405. The rollers 406 are fixedly connected to support shafts 409 that are rotatably fitted in the support holes 408 on both sides.

[0035] The operation process of this embodiment is as follows: when the connecting rod 401 moves up and down, because the bottom of the fixing plate 402 is fixedly connected to the bottom of the housing 1, the limiting hole 407 on the fixing plate 402 plays a guiding role in the movement of the connecting rod 401;

[0036] When the roller 406 slides relative to the profile of the cam 501 , the roller 406 itself will rotate relative to the support hole 408 to reduce the impact of the cam 501 on the roller 406 when it rotates. Specific embodiment three

[0038] See also Figure 1-6 On the basis of the first and second embodiments, specifically, the side surface of the worm 504 is located at the outer bottom of the housing 1 and is provided with a locking assembly 6, the locking assembly 6 includes a locking member 609 sleeved and fitted on the side surface of the worm 504, the locking member 609 includes a sleeve 601 fixedly connected to the outer bottom of the housing 1, the bottom of the sleeve 601 is fixedly connected with a plurality of arc-shaped spring pieces 602 in a circular array, and the outer side surface of the sleeve 601 is threadedly connected to a limit ring 608, An external thread 603 is provided on the outer side of the sleeve 601, and a collar 604 is threadedly connected to the outer side of the sleeve 601 at the bottom of the limit ring 608. A sleeve 605 is fixedly connected to the top of the knob 505 and is snap-fitted to the inner sides of the plurality of arc-shaped spring pieces 602. The inner side of the sleeve 605 is fixedly connected to the outer side of the worm 504. A plurality of groups of rubber balls 606 are fixed on the inner sides of the plurality of arc-shaped spring pieces 602 in a circular array, and an internal thread 607 is provided on the inner side of the collar 604.

[0039] The operation process of this embodiment is as follows: when the top of the collar 604 is in contact with the bottom of the stop ring 608, the inner side surfaces of the plurality of arc-shaped spring pieces 602 are not in contact with the outer peripheral side surfaces of the sleeve 605, and the sleeve 605 can rotate relative to the plurality of arc-shaped spring pieces 602, and the upper and lower positions of the presser foot 2 can be adjusted by rotating the knob 505;

[0040] After adjusting the up and down position of the presser foot 2, it is necessary to fix the presser foot 2, that is, to lock the movement of the driven component 4, and then the collar 604 is rotated to make it move downward along the outer peripheral side of the sleeve 601. At this time, the inner peripheral side of the collar 604 gradually fits with the outer peripheral side of the plurality of arc-shaped spring pieces 602 fixed on the bottom of the sleeve 601, so that the plurality of arc-shaped spring pieces 602 begin to close together, and the inner side of the plurality of arc-shaped spring pieces 602 gradually fits with the outer peripheral side of the sleeve 605, and the rubber ball 606 increases the friction of the two fitting surfaces. Because the top of the sleeve 601 is fixedly connected to the outer bottom of the casing 1, the sleeve 605 is locked by the friction of the two fitting surfaces, and the bottom of the sleeve 605 is fixedly connected to the top of the knob 505, so that the knob 505 is locked, and the movement of the transmission component 5 is locked, thereby locking the movement of the driven component 4, and then fixing the up and down position of the presser foot 2 is achieved.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A presser foot driving mechanism for a sewing machine, comprising a housing (1) and a presser foot (2), wherein a presser foot rod (3) is fixed to the top of the presser foot (2); characterized in that: A driven component (4) is arranged on the top of the presser foot rod (3); The driven assembly (4) comprises a connecting rod (401) fixedly connected to the top of the presser foot rod (3); a fixing plate (402) is slidably matched on the peripheral side of the connecting rod (401); a spring (403) sleeved and matched on the peripheral side of the connecting rod (401) is fixedly connected to the top of the fixing plate (402); a connecting plate (404) is fixedly connected to the top of the connecting rod (401); one end of the spring (403) is fixedly connected to the bottom of the connecting plate (404); two symmetrical mounting plates (405) are fixedly connected to the top of the connecting plate (404); and the two mounting plates (405) are rotatably matched with rollers (406) relative to one side. A transmission assembly (5) is arranged inside the housing (1), and the transmission assembly (5) comprises a cam (501) which is slidably engaged with the peripheral side surface of the roller (406), one side surface of the cam (501) is fixedly connected to a rotating shaft (502) which is rotatably engaged with an inner side surface of the housing (1), a worm wheel (503) is fixed to the peripheral side surface of the rotating shaft (502), the peripheral side surface of the worm wheel (503) is meshingly engaged with a worm (504) which is rotatably engaged with the top of the housing (1), and a knob (505) is fixed to the bottom of the worm (504).

2. A presser foot driving mechanism for a sewing machine according to claim 1, characterized in that: A limiting hole (407) is provided through the top of the fixing plate (402) and is slidably fitted on the peripheral side of the connecting rod (401). The bottom of the fixing plate (402) is fixedly connected to the inner bottom of the casing (1).

3. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: A support hole (408) is formed through one side of each of the two mounting plates (405), and a support shaft (409) rotatably engaged in the support hole (408) is fixedly connected to two opposite side surfaces of the roller (406).

4. A presser foot driving mechanism for a sewing machine according to claim 1, characterized in that: The peripheral side surface of the worm (504) is located at the outer bottom of the housing (1) and is sleeved with a locking assembly (6), the locking assembly (6) comprising a locking member (609) sleeved and matched on the peripheral side surface of the worm (504), the locking member (609) comprising a sleeve (601) fixedly connected to the outer bottom of the housing (1), the bottom of the sleeve (601) being fixedly connected with a plurality of arc-shaped spring pieces (602) in a circular array, and the outer peripheral side surface of the sleeve (601) being threadedly connected with a limit ring (608); An external thread (603) is provided on the outer peripheral side of the sleeve (601), and a collar (604) is threadedly connected to the outer peripheral side of the sleeve (601) at the bottom of the limiting ring (608).

5. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: The top of the knob (505) is fixedly connected with a shaft sleeve (605) which is snap-fitted to the inner side surfaces of the plurality of arc-shaped spring sheets (602), and the inner peripheral side surface of the shaft sleeve (605) is fixedly connected to the peripheral side surface of the worm (504).

6. A presser foot driving mechanism for a sewing machine according to claim 4, characterized in that: A plurality of groups of rubber balls (606) are fixed on the inner side surfaces of the arc-shaped spring pieces (602) in a circular array, and an inner side surface of the collar (604) is provided with an internal thread (607).

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