CN111501216B - Sewing machine trimming, presser foot lifting and needle distance adjusting device and sewing machine - Google Patents
Sewing machine trimming, presser foot lifting and needle distance adjusting device and sewing machine Download PDFInfo
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- CN111501216B CN111501216B CN201910098254.4A CN201910098254A CN111501216B CN 111501216 B CN111501216 B CN 111501216B CN 201910098254 A CN201910098254 A CN 201910098254A CN 111501216 B CN111501216 B CN 111501216B
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- presser foot
- trimming
- foot lifting
- adjusting
- needle
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention relates to the technical field of sewing machines, in particular to a thread trimming, presser foot lifting and needle distance adjusting device of a sewing machine and the sewing machine comprising the device. The device comprises a power part, a first cam with a trimming contour surface, a second cam with a presser foot lifting contour surface and a needle pitch adjusting contour surface, a trimming driving crank connected with a trimming mechanism, a presser foot lifting driving crank connected with a presser foot lifting mechanism and a needle pitch adjusting driving crank connected with a needle pitch adjusting mechanism, wherein trimming balls matched with the trimming contour surface are arranged on the trimming driving crank, a presser foot lifting ball matched with the presser foot lifting contour surface is arranged on the presser foot lifting driving crank, and a needle pitch adjusting ball matched with the needle pitch adjusting contour surface is arranged on the needle pitch adjusting driving crank. The two cams are driven by one power part to synchronously rotate, so that the corresponding thread trimming mechanism, the presser foot lifting mechanism or the needle pitch adjusting mechanism can be driven to move to execute thread trimming action, presser foot lifting action or needle pitch adjusting action, and the thread trimming device is simple and compact in structure, high in transmission efficiency and good in stability.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a thread trimming, presser foot lifting and needle distance adjusting device of a sewing machine and the sewing machine.
Background
A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a fabric, thereby interweaving or stitching one or more layers of material. The sewing machine is generally composed of four parts, namely a feeding device, a base, a transmission and an accessory, and sewing materials are sewn through reasonable cooperation and circular work of the motion of each mechanism.
At present, the sewing machine can use the functions of automatic thread trimming, automatic presser foot lifting and automatic needle distance adjustment in the sewing process. The common mode is that two electromagnets with different powers are used for respectively driving a thread trimming mechanism and a presser foot lifting mechanism to act, so that the functions of automatic thread trimming and automatic presser foot lifting are realized, and in addition, a stepping motor is used for driving a needle pitch adjusting mechanism to act, so that the function of automatic needle pitch adjustment is realized. The driving mode has the defects of complex structure and low transmission efficiency.
Disclosure of Invention
The invention aims to solve the technical problem of providing a thread cutting, presser foot lifting and needle distance adjusting device of a sewing machine, which has a simple structure and high transmission efficiency and overcomes the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: a thread trimming, presser foot lifting and needle distance adjusting device of a sewing machine comprises: a power member; the first cam is connected with the power part and driven by the power part to rotate, and the first cam is provided with a trimming profile surface; the second cam is connected with the power part and driven by the power part to rotate, and the second cam is provided with a presser foot lifting profile surface and a needle pitch adjusting profile surface; the trimming driving crank is connected with the trimming mechanism, and trimming balls are arranged on the trimming driving crank and matched with the trimming contour surface of the first cam; the pressure foot lifting driving crank is connected with the pressure foot lifting mechanism, and is provided with a pressure foot lifting ball matched with the pressure foot lifting contour surface of the second cam; and the needle pitch adjusting driving crank is connected with the needle pitch adjusting mechanism, and a needle pitch adjusting ball is arranged on the needle pitch adjusting driving crank and matched with the needle pitch adjusting contour surface of the second cam.
Preferably, the pressure foot lifting profile surface is positioned on the outer periphery of the second cam, and the needle pitch adjusting profile surface is positioned on one side of the second cam.
Preferably, the thread cutting mechanism comprises a thread cutting driving shaft which is rotatably supported on a bottom plate of the sewing machine, the thread cutting driving crank is fixedly arranged on the thread cutting driving shaft, and the thread cutting driving shaft is connected with the thread cutting assembly.
Preferably, the thread trimming mechanism further comprises a thread trimming crank and a thread trimming connecting rod, one end of the thread trimming crank is fixedly arranged on the thread trimming driving shaft, the other end of the thread trimming crank is hinged with one end of the thread trimming connecting rod, and the other end of the thread trimming connecting rod is connected with the thread trimming assembly.
Preferably, the presser foot lifting mechanism comprises a presser foot lifting driving shaft, a presser foot lifting crank and a push rod, the presser foot lifting driving shaft is rotatably supported on a bottom plate of the sewing machine, the presser foot lifting driving crank is fixedly arranged on the presser foot lifting driving shaft, one end of the presser foot lifting crank is fixedly arranged on the presser foot lifting driving shaft, the other end of the presser foot lifting crank is abutted to the bottom end of the push rod, and the top end of the push rod is connected with the presser foot lifting assembly.
Preferably, a cushion pad is arranged between the presser foot lifting crank and the ejector rod.
Preferably, the needle pitch adjusting mechanism comprises a needle pitch adjusting driving shaft, a needle pitch adjusting crank, a needle pitch adjusting connecting rod and a needle pitch adjusting swing plate seat, the needle pitch adjusting driving shaft is rotatably supported on a bottom plate of the sewing machine, the needle pitch adjusting driving crank is fixedly arranged on the needle pitch adjusting driving shaft, one end of the needle pitch adjusting crank is fixedly arranged on the needle pitch adjusting driving shaft, the other end of the needle pitch adjusting crank is hinged with one end of the needle pitch adjusting connecting rod, the other end of the needle pitch adjusting connecting rod is hinged with the needle pitch adjusting swing plate seat, and the needle pitch adjusting swing plate seat is connected with the needle pitch adjusting assembly.
Preferably, the power part is a double-output-shaft motor, and the first cam and the second cam are respectively arranged on the rotating shafts at two sides of the double-output-shaft motor.
The invention also provides a sewing machine which comprises the thread cutting, presser foot lifting and needle distance adjusting device of the sewing machine.
Compared with the prior art, the invention has the remarkable progress that:
the invention relates to a sewing machine thread cutting, presser foot lifting and needle distance adjusting device and a sewing machine comprising the same.A power part drives two cams to synchronously rotate, and corresponding thread cutting mechanisms, presser foot lifting mechanisms or needle distance adjusting mechanisms can be driven to move through the angle matching of a thread cutting profile surface on a first cam, a presser foot lifting profile surface on a second cam and a needle distance adjusting profile surface to execute thread cutting actions, presser foot lifting actions or needle distance adjusting actions, namely, one power part drives two cams to realize three functions of thread cutting, presser foot lifting and needle distance adjusting.
Drawings
Fig. 1 is a schematic view of the overall structure of a sewing machine according to an embodiment of the present invention.
FIG. 2 is a schematic structural view of a thread trimming, presser foot lifting and stitch length adjusting device of the sewing machine according to the embodiment of the invention.
Fig. 3 is a schematic structural view of the first cam in the embodiment of the present invention.
Fig. 4 is a schematic structural view of the second cam in the embodiment of the present invention, as viewed from one direction.
Fig. 5 is a schematic structural view of the second cam in the embodiment of the present invention, as seen from another direction.
Fig. 6 is a schematic structural diagram of the thread trimming mechanism, the thread trimming driving crank and the first cam in the embodiment of the invention.
Fig. 7 is a schematic structural view of the presser foot lifting mechanism, the presser foot lifting driving crank and the second cam in the embodiment of the invention.
Fig. 8 is a schematic structural diagram of the needle pitch adjusting mechanism, the needle pitch adjusting driving crank and the second cam in the embodiment of the invention.
Fig. 9 is a schematic diagram of the configuration of the shear profile of the first cam in an embodiment of the present invention.
Fig. 10 is a schematic structural view of a lift and press foot profile of the second cam in an embodiment of the invention.
Fig. 11 is a schematic structural view of the pitch contour surface of the second cam in the embodiment of the present invention.
Fig. 12 is a schematic diagram of three driving sections into which the power member rotates once in the embodiment of the present invention.
Wherein the reference numerals are as follows:
1. bottom plate 2, oil pan
3. Power member 30, rotating shaft
31. Bracket 401, first cam
402. Second cam 403, first cam body
404. Trimming cam body 405 and arc-shaped limiting part
406. Pressure foot lifting cam body 407 and needle distance adjusting cam body
408. Annular limiting part 41 and trimming contour surface
411. Base circle section 412 for trimming, trimming section
413. Depressed section 42, lift presser foot profile
421. Lift presser foot base circle segment 422, first lift presser foot segment
423. Second lifting presser foot section 43, profile surface for adjusting needle pitch
431. Needle pitch adjusting section 432 and first transition section
433. First arc segment 434, second transition segment
435. Second arc segment 51, trimming drive shaft
52. Trimming driving crank 521 and trimming ball
53. Trimming crank 54 and trimming connecting rod
55. Moving knife rest 56 and moving knife
57. Stationary knife 61, lift presser foot drive shaft
62. Lift presser foot drive crank 621, lift presser foot ball
63. Crank 64 and ejector rod for lifting presser foot
71. Needle pitch adjusting drive shaft 72 and needle pitch adjusting drive crank
721. Needle pitch adjusting ball 73 and needle pitch adjusting crank
74. Needle pitch adjusting connecting rod 75 and needle pitch adjusting swing plate seat
76. Connecting rod structure 77 and feeding structure
78. Needle pitch adjusting connecting pin
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
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", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 to 12, an embodiment of the present invention provides a thread cutting, presser foot lifting and stitch length adjusting device for a sewing machine. The thread trimming, presser foot lifting and needle distance adjusting device of the sewing machine is arranged in the sewing machine and used for achieving the thread trimming function, the presser foot lifting function and the needle distance adjusting function of the sewing machine. For convenience of description, the moving direction of the cloth when the sewing machine sews is defined as a forward direction, and a direction perpendicular to the moving direction of the cloth on a horizontal plane is a left-right direction, and a side close to the head is a left side and a side close to the tail is a right side.
Referring to fig. 1, the sewing machine has a base plate 1 and an oil pan 2, the oil pan 2 is fixed on the base plate 1, and the thread trimming, presser foot lifting and stitch length adjusting device of the sewing machine of the present embodiment is installed on the base plate 1.
Referring to fig. 2, the device for lifting and adjusting the needle distance of the thread trimming presser foot of the sewing machine of the present embodiment includes a power member 3, a first cam 401, a second cam 402, a thread trimming driving crank 52, a thread trimming mechanism, a presser foot lifting driving crank 62, a presser foot lifting mechanism, a needle distance adjusting driving crank 72, and a needle distance adjusting mechanism.
The power part 3 is fixedly supported on the bottom plate 1 of the sewing machine through the support 31, the first cam 401 and the second cam 402 are both connected with the power part 3, the power part 3 is provided with a rotating shaft 30, the first cam 401 and the second cam 402 are both fixedly arranged on the rotating shaft 30 of the power part 3, and the first cam 401 and the second cam 402 are driven to synchronously rotate along with the rotating shaft 30 of the power part 3 through rotation. Preferably, the power member 3 is a dual output shaft motor, both sides of the dual output shaft motor are provided with rotating shafts 30, and the first cam 401 and the second cam 402 are respectively installed on the rotating shafts 30 on both sides of the dual output shaft motor, in this embodiment, the first cam 401 is installed on the rotating shaft 30 on the left side of the dual output shaft motor, and the second cam 402 is installed on the rotating shaft 30 on the right side of the dual output shaft motor. The angle of the power part 3 driving the first cam 401 and the second cam 402 to rotate is controllable, and preferably, the power part 3 can be a dual-output-shaft stepping motor or a dual-output-shaft servo motor, so that the accurate control of the rotation angle of the first cam 401 and the second cam 402 can be realized. Referring to fig. 3, the first cam 401 in this embodiment has a shear profile 41. Referring to fig. 4 and 5, the second cam 402 in this embodiment has a lift and press foot profile surface 42 and a needle pitch profile surface 43, preferably, the lift and press foot profile surface 42 is located on the outer periphery of the second cam 402, the needle pitch profile surface 43 is located on one side of the second cam 402, and in this embodiment, the needle pitch profile surface 43 is located on the right side of the second cam 402.
Referring to fig. 2 and 6, the trimming ball 521 is disposed on the trimming driving crank 52, and the trimming ball 521 is engaged with the trimming contour surface 41 of the first cam 401. The trimming ball 521 may be fixedly mounted on the trimming driving crank 52, or may be rollably mounted on the trimming driving crank 52, and in this embodiment, the trimming ball 521 is preferably rollably mounted on the trimming driving crank 52, so as to reduce the friction between the trimming ball 521 and the trimming contour surface 41 of the first cam 401 when the trimming ball 521 is engaged with the trimming contour surface. The thread cutting drive crank 52 is connected to the thread cutting mechanism. When the power member 3 drives the first cam 401 to rotate, the trimming contour surface 41 of the first cam 401 rotates around the axis of the rotating shaft 30 of the power member 3, and the trimming driving crank 52 is driven to swing by the action of the trimming contour surface 41 on the trimming ball 521, and the swinging of the trimming driving crank 52 drives the trimming mechanism to move, so as to perform the trimming action.
In the present embodiment, preferably, referring to fig. 2 and 6, the thread cutting mechanism includes a thread cutting drive shaft 51, the thread cutting drive shaft 51 is rotatably supported on the base plate 1, and the thread cutting drive shaft 51 is parallel to the rotating shaft 30 of the power member 3. The thread cutting driving crank 52 is fixedly arranged at the right end of the thread cutting driving shaft 51, and the left end of the thread cutting driving shaft 51 is connected with the thread cutting assembly. When the first cam 401 drives the trimming driving crank 52 to swing, the trimming driving shaft 51 is driven to rotate by the swinging of the trimming driving crank 52, and the trimming assembly is driven to move by the rotation of the trimming driving shaft 51 to perform the trimming action. Furthermore, the thread trimming mechanism further comprises a thread trimming crank 53 and a thread trimming connecting rod 54, one end of the thread trimming crank 53 is fixedly arranged at the left end of the thread trimming driving shaft 51, the other end of the thread trimming crank 53 is hinged with one end of the thread trimming connecting rod 54, and the other end of the thread trimming connecting rod 54 is connected with the thread trimming component. When the thread cutting driving shaft 51 rotates, the thread cutting crank 53 rotates along with the thread cutting driving shaft, and drives the thread cutting connecting rod 54 to move, and the thread cutting connecting rod 54 drives the thread cutting assembly to move, so that thread cutting is performed. The trimming crank 53 is directly connected with the trimming component through the trimming connecting rod 54, so that the structure is greatly simplified. The thread trimming component can be a structure capable of realizing thread trimming action in the prior art, and the thread trimming component can be suitable for various structural forms and has the advantage of wide application range. For example, the thread trimming assembly may include a movable cutter holder 55, a movable cutter 56 and a fixed cutter 57, the movable cutter 56 is mounted on the movable cutter holder 55, the fixed cutter 57 is fixedly mounted on the base plate 1, and the other end of the thread trimming connecting rod 54 is hinged to the movable cutter holder 55, so that when the thread trimming driving shaft 51 rotates, the movable cutter 56 is driven to move relative to the fixed cutter 57 through the transmission of the thread trimming crank 53 and the thread trimming connecting rod 54, and the thread trimming operation is performed. Of course, the structure of the thread cutting assembly is not limited to this single-action knife structure, and a double-action knife structure may be employed.
Referring to fig. 2 and 7, the presser foot lifting driving crank 62 is provided with a presser foot lifting ball 621, and the presser foot lifting ball 621 is matched with the presser foot lifting contour surface 42 of the second cam 402. The presser foot lifting ball 621 may be fixedly mounted on the presser foot lifting drive crank 62, or may be rollably mounted on the presser foot lifting drive crank 62, in this embodiment, the presser foot lifting ball 621 is rollably mounted on the presser foot lifting drive crank 62, so that the friction force between the presser foot lifting ball 621 and the presser foot lifting profile surface 42 of the second cam 402 can be reduced. The presser foot lifting drive crank 62 is connected to the presser foot lifting mechanism. When the power member 3 drives the second cam 402 to rotate, the presser foot lifting profile surface 42 of the second cam 402 rotates along with the axis of the rotating shaft 30 of the power member 3, the presser foot lifting drive crank 62 can be driven to swing through the action of the presser foot lifting profile surface 42 on the presser foot lifting ball 621, and the presser foot lifting mechanism is driven to move through the swinging of the presser foot lifting drive crank 62 to execute the presser foot lifting action. The precise control of the lifting height of the presser foot can be realized by controlling the rotating angle of the second cam 402 by the power part 3.
In the present embodiment, preferably, referring to fig. 2 and 7, the presser foot lifting mechanism includes a presser foot lifting drive shaft 61, a presser foot lifting crank 63 and a push rod 64, the presser foot lifting drive shaft 61 is rotatably supported on the bottom plate 1, and the presser foot lifting drive shaft 61 is parallel to the rotating shaft 30 of the power member 3, in the present embodiment, the presser foot lifting drive shaft 61 is a shaft sleeve axially penetrating through. The pressure lifting and foot driving crank 62 is fixedly arranged at the left end of the pressure lifting and foot driving shaft 61, one end of the pressure lifting and foot crank 63 is fixedly arranged at the right end of the pressure lifting and foot driving shaft 61, the other end of the pressure lifting and foot crank 63 is abutted against the bottom end of the ejector rod 64, and the top end of the ejector rod 64 is connected with the pressure lifting and foot assembly. When the second cam 402 drives the presser foot lifting driving crank 62 to swing, the presser foot lifting driving shaft 61 is driven by the swing of the presser foot lifting driving crank 62 to rotate along with the presser foot lifting driving shaft, the presser foot lifting crank 63 is driven by the rotation of the presser foot lifting driving shaft 61 to swing along with the presser foot lifting driving shaft, so that the presser foot lifting crank 63 pushes the ejector rod 64 to move upwards, the presser foot lifting assembly is driven by the movement of the ejector rod 64 to move, and the presser foot lifting action is executed. The presser foot lifting component can be a structure capable of realizing the action of lifting the presser foot in the prior art. Meanwhile, the presser foot lifting mechanism of the embodiment does not interfere the installation of the existing knee rest presser foot lifting, and can meet the requirements of different users at the same time. Preferably, a buffer pad can be arranged between the presser foot lifting crank 63 and the mandril 64, so as to play a role of buffering, and reduce vibration and noise in the presser foot lifting process.
Referring to fig. 2 and 8, the needle pitch driving crank 72 is provided with a needle pitch ball 721, and the needle pitch ball 721 is engaged with the needle pitch contour surface 43 of the second cam 402. The pitch ball 721 may be fixedly mounted on the pitch drive crank 72 or rollably mounted on the pitch drive crank 72, and in this embodiment, the pitch ball 721 is preferably rollably mounted on the pitch drive crank 72, so as to reduce the friction between the pitch ball 721 and the pitch profile 43 of the second cam 402 when they are engaged. The needle pitch drive crank 72 is connected to the needle pitch mechanism. When the power member 3 drives the second cam 402 to rotate, the needle adjusting profile surface 43 of the second cam 402 rotates around the axis of the rotating shaft 30 of the power member 3, and the needle adjusting driving crank 72 is driven to swing by the action of the needle adjusting profile surface 43 on the needle adjusting ball 721, so that the needle adjusting mechanism is driven to move by the swing of the needle adjusting driving crank 72 to perform the needle adjusting action. By controlling the rotation angle of the second cam 402 by the power member 3, the accurate adjustment of the needle pitch can be realized.
In the present embodiment, preferably, referring to fig. 2 and 8, the needle pitch adjusting mechanism includes a needle pitch adjusting driving shaft 71, a needle pitch adjusting crank 73, a needle pitch adjusting connecting rod 74 and a needle pitch adjusting swing plate seat 75, the needle pitch adjusting driving shaft 71 is rotatably supported on the bottom plate 1, and the needle pitch adjusting driving shaft 71 is parallel to the rotating shaft 30 of the power member 3. The needle pitch adjusting driving crank 72 is fixedly arranged at the left end of the needle pitch adjusting driving shaft 71, one end of the needle pitch adjusting crank 73 is fixedly arranged at the right end of the needle pitch adjusting driving shaft 71, the other end of the needle pitch adjusting crank 73 is hinged with one end of the needle pitch adjusting connecting rod 74 through a needle pitch adjusting connecting pin 78, the other end of the needle pitch adjusting connecting rod 74 is hinged with a needle pitch adjusting swing plate seat 75, and the needle pitch adjusting swing plate seat 75 is connected with a needle pitch adjusting assembly. When the second cam 402 drives the needle pitch adjusting driving crank 72 to swing, the needle pitch adjusting driving shaft 71 is driven to rotate by the swinging of the needle pitch adjusting driving crank 72, when the needle pitch adjusting driving shaft 71 rotates, the needle pitch adjusting swing plate seat 75 can be driven to rotate by the transmission belts of the needle pitch adjusting crank 73 and the needle pitch adjusting connecting rod 74, and the needle pitch adjusting assembly is driven to move by the rotation of the needle pitch adjusting swing plate seat 75 to execute the needle pitch adjusting action. The stitch length adjusting assembly may be a link structure 76 and a feeding structure 77 that are capable of performing a stitch length adjusting operation in the prior art.
According to the thread cutting, presser foot lifting and needle distance adjusting device for the sewing machine, the two cams are driven by the power part 3 to synchronously rotate, and the corresponding thread cutting mechanism, presser foot lifting mechanism or needle distance adjusting mechanism can be driven to move through the angle matching of the thread cutting profile surface 41 on the first cam 401, the presser foot lifting profile surface 42 on the second cam 402 and the needle distance adjusting profile surface 43 to execute thread cutting action, presser foot lifting action or needle distance adjusting action, namely, the two cams are driven by the power part 3 to realize three functions of thread cutting, presser foot lifting and needle distance adjusting, so that the structure can be greatly simplified, the structure is simple and compact, the transmission efficiency is high, and the stability is good.
In this embodiment, the power member 3 may be connected to a controller (not shown), and the controller controls the power member 3 to start or stop rotating according to the operation requirement of the sewing machine, and controls the rotating direction and the rotating angle of the power member 3, so as to control the engagement state between the trimming profile surface 41 of the first cam 401 and the trimming ball 521, the engagement state between the presser foot lifting profile surface 42 of the second cam 402 and the presser foot lifting ball 621, and the engagement state between the stitch regulating profile surface 43 of the second cam 402 and the stitch regulating ball 721, thereby realizing the precise control of the trimming operation, the presser foot lifting operation, and the stitch regulating operation. The controller can be a main controller of the existing sewing machine, such as a PLC controller or a singlechip.
Referring to fig. 3, the first cam 401 in this embodiment includes a first cam body 403 and a trimming cam body 404, the first cam body 403 is a disc-shaped cam, and the trimming cam body 404 is located on the left side surface of the first cam body 403 and is arranged coaxially with the first cam body 403, that is, the first cam body 403 and the trimming cam body 404 rotate around the same rotation center. Preferably, the first cam body 403 and the trimming cam body 404 are an integrally formed integral piece, that is, the first cam 401 is an integrally formed integral piece. Of course, the first cam body 403 and the trimming cam body 404 may be separate pieces arranged coaxially.
Referring to fig. 3 and 9, the outer peripheral surface of the trimming cam body 404 is a trimming contour surface 41, and the trimming contour surface 41 includes a trimming base circle segment 411, a trimming segment 412 and a recessed segment 413 which are sequentially connected to form a circle along the circumferential direction. The trimming base circle segment 411 is an arc segment concentrically arranged with the rotation center of the trimming cam body 404, the distance between the trimming segment 412 and the rotation center of the trimming cam body 404 gradually increases, and the concave segment 413 protrudes toward the inside of the trimming cam body 404, so that the end of the trimming segment 412 is the highest point of the trimming contour surface 41. During one rotation of the first cam 401, the trimming ball 521 is in contact engagement with the trimming base circle segment 411 and the trimming segment 412 of the trimming contour surface 41. When the trimming ball 521 is located at the trimming base circle segment 411, the position of the trimming ball 521 is kept unchanged, the trimming driving crank 52 executes an idle stroke, and the trimming mechanism does not act. After the trimming ball 521 enters the trimming section 412 from the trimming base circle section 411, the trimming driving crank 52 gradually swings under the driving of the trimming section 412 along with the rotation of the first cam 401, the trimming mechanism is driven to perform the trimming action until the trimming ball 521 reaches the end of the trimming section 412, and the trimming action is completed. After the trimming operation is completed, if the first cam 401 continues to rotate, the trimming ball 521 will cross the end of the trimming segment 412 and the concave segment 413 to reach the trimming base circle segment 411, in this process, the trimming driving crank 52 and the trimming mechanism can be reversely moved and reset under the action of the trimming mechanism reset spring, which is the prior art and is not described herein again. After the thread trimming operation is completed, if the first cam 401 rotates in the reverse direction, the thread trimming ball 521 will move in the reverse direction along the thread trimming section 412, and drive the thread trimming driving crank 52 and the thread trimming mechanism to reset.
Preferably, the first cam 401 is provided with an arc-shaped limiting portion 405, the arc-shaped limiting portion 405 is disposed at an outer edge of the left side surface of the first cam body 403, an inner side surface of the arc-shaped limiting portion 405 is disposed opposite to the trimming section 412 of the trimming contour surface 41 at an interval, a track groove is formed between the inner side surface of the arc-shaped limiting portion 404 (i.e., the side surface of the arc-shaped limiting portion 404 opposite to the trimming contour surface 41) and the trimming section 412, the trimming ball 521 moves along the track groove when passing through the trimming section 412, the arc-shaped limiting portion 404 can limit the movement of the trimming ball 521 when passing through the trimming section 412, and the trimming ball 521 rolls along the trimming section 412, thereby ensuring accurate execution of trimming.
Referring to fig. 4 and 5, the second cam 402 in this embodiment includes a lifting and pressing pin cam body 406 and a needle adjusting cam body 407, the lifting and pressing pin cam body 406 is a disk-shaped cam, and the needle adjusting cam body 407 is located on the right side surface of the lifting and pressing pin cam body 406 and is coaxially disposed with the lifting and pressing pin cam body 406, that is, the lifting and pressing pin cam body 406 and the needle adjusting cam body 407 rotate around the same rotation center. Preferably, the lifting and pressing pin cam body 406 and the needle adjustment cam body 407 are an integrally formed integral piece, i.e., the second cam 402 is an integrally formed integral piece. Of course, the presser foot cam body 406 and the needle adjustment cam body 407 may be coaxially arranged as separate members.
Referring to fig. 4 and 10, the outer circumferential surface of the presser foot lifting cam body 406 is provided with a presser foot lifting contour surface 42, and the presser foot lifting contour surface 42 includes a presser foot lifting base circular section 421, a first presser foot lifting section 422 and a second presser foot lifting section 423 which are sequentially connected in a circumferential direction to form a circle. The presser foot lifting base circle section 421 is a circular arc section concentrically arranged with the rotation center of the presser foot lifting cam body 406, the first presser foot lifting section 422 and the second presser foot lifting section 423 are symmetrically arranged, and the distances between the first presser foot lifting section 422 and the second presser foot lifting section 423 and the rotation center of the presser foot lifting cam body 406 are gradually increased and are intersected at the tail ends, so that the intersection point of the first presser foot lifting section 422 and the second presser foot lifting section 423 is the highest point of the presser foot lifting contour surface 42. During one rotation of the second cam 402, the presser foot lifting ball 621 is in contact fit with the presser foot lifting base circle section 421, the first presser foot lifting section 422 and the second presser foot lifting section 423. When the presser foot lifting ball 621 is located at the presser foot lifting base circle section 421, the position of the presser foot lifting ball 621 is kept unchanged, the presser foot lifting driving crank 62 executes an idle stroke, and the presser foot lifting mechanism does not act. When the presser foot lifting ball 621 enters the first presser foot lifting section 422 from the presser foot lifting base circle section 421 or enters the second presser foot lifting section 423 from the presser foot lifting base circle section 421, the presser foot driving crank 62 is driven by the first presser foot lifting section 422 or the second presser foot lifting section 423 to gradually swing along with the rotation of the second cam 402, and the presser foot lifting mechanism is driven to perform the presser foot lifting action until the presser foot lifting ball 621 reaches the intersection point of the first presser foot lifting section 422 and the second presser foot lifting section 423, and the presser foot lifting height reaches the maximum value, and in the process, the presser foot lifting height can be controlled by controlling the rotation angle of the second cam 402. Through the first presser foot lifting section 422 and the second presser foot lifting section 423 which are symmetrically arranged, the second cam 402 can rotate in both the positive direction and the negative direction to realize the presser foot lifting action, so that the presser foot lifting action can be continuously executed in a rotating way after the second cam 402 rotates in one direction to execute the thread trimming action (for example, the presser foot lifting ball 621 enters the first presser foot lifting section 422 from the presser foot lifting base circle section 421) or the presser foot lifting action can be executed in the other direction by the second cam 402 (for example, the presser foot lifting ball 621 enters the second presser foot lifting section 423 from the presser foot lifting base circle section 421 under the condition that the thread trimming action is not executed). Under the condition that the presser foot lifting action is continuously rotated after the thread trimming action is finished, the presser foot lifting action is finished, and after the related operation is finished, the second cam 402 can be continuously rotated, the presser foot lifting ball 621 enters the second presser foot lifting section 423 from the first presser foot lifting section 422 and moves towards the presser foot lifting base circle section 421 along the second presser foot lifting section 423, and the presser foot lifting driving crank 62 and the presser foot lifting mechanism can be driven to reversely act and reset, so that the presser foot is lowered to the initial position. When the presser foot lifting action is executed under the condition that the thread trimming action is not executed, the presser foot lifting action is completed, and after the related operation is completed, the second cam 402 can be reversely rotated, the presser foot lifting ball 621 reversely moves along the second presser foot lifting section 423, and the presser foot lifting driving crank 62 and the presser foot lifting mechanism can be driven to reversely act and reset, so that the presser foot is lowered to the initial position.
Referring to fig. 5, the outer peripheral surface of the needle pitch adjusting cam body 407 is the needle pitch adjusting profile surface 43, and during one rotation of the second cam 402, the needle pitch adjusting balls 721 are always in contact with the needle pitch adjusting profile surface 43, and influence is exerted on the needle pitch by the needle pitch adjusting profile surface 43. In this embodiment, preferably, the second cam 402 is provided with an annular limiting portion 408, the annular limiting portion 408 is disposed at an outer edge of the right side surface of the presser foot cam body 406, an inner circumferential surface of the annular limiting portion 408 is disposed opposite to the needle pitch adjusting profile surface 43 at an interval, an annular track groove is formed between the inner circumferential surface of the annular limiting portion 408 and the needle pitch adjusting profile surface 43, the needle pitch adjusting ball 721 moves along the annular track groove, the annular limiting portion 408 can limit the movement of the needle pitch adjusting ball 721, and the needle pitch adjusting ball 721 is ensured to move along the needle pitch adjusting profile surface 43, thereby ensuring accurate execution of the needle pitch adjusting action. Preferably, the center of the right side surface of the lifting and pressing foot cam body 406 is recessed inwards, so that the outer edge of the right side surface of the lifting and pressing foot cam body 406 forms the annular limiting portion 408, the outer peripheral surface of the annular limiting portion 408 forms the lifting and pressing foot profile surface 42, and the needle adjusting cam body 407 is arranged at the central recess of the right side surface of the lifting and pressing foot cam body 406 and has a gap with the inner peripheral surface of the annular limiting portion 408, so as to form the annular track groove.
Referring to fig. 11, the needle pitch adjusting contour surface 43 includes a needle pitch adjusting section 431, a first transition section 432, a first circular arc section 433, a second transition section 434, and a second circular arc section 435, which are sequentially connected in a circumferential direction to form a circle. The distance between the needle pitch adjusting section 431 and the rotation center of the needle pitch adjusting cam body 407 gradually increases, the corresponding needle pitch gradually decreases from the maximum value + N to the minimum value-N, N is a positive number, for example, N is 5mm, and backstitch can be realized in the range of (-N, 0) needle pitch. The distance between the first transition section 432 and the rotation center of the needle pitch adjusting cam body 407 gradually decreases, and the corresponding needle pitch gradually increases from the minimum value-N to 0. The end of the gauge adjustment section 431, i.e. the intersection of the gauge adjustment section 431 and the first transition section 432, is the highest point of the gauge adjustment contour surface 43. The first arc segment 433 is an arc segment concentrically disposed with the rotation center of the needle pitch adjusting cam body 407, and the corresponding needle pitch is maintained at 0. The distance between the second transition 434 and the rotation center of the needle adjustment cam body 407 gradually decreases, and the corresponding needle pitch gradually increases from 0 to a maximum value + N. The second circular arc 435 is a circular arc concentrically disposed with the rotation center of the needle pitch adjusting cam body 407, and the corresponding needle pitch is maintained at the maximum value + N. The needle pitch adjusting section 431 is a main action section of the needle pitch adjusting contour surface 43, and can realize the adjustment of the working needle pitch of the sewing machine within the range of (-N, + N) needle pitch. When the pitch adjusting ball 721 is located at the pitch adjusting section 431, the pitch adjusting driving crank 72 swings under the driving of the pitch adjusting section 431 along with the rotation of the second cam 402, drives the pitch adjusting mechanism to perform the pitch adjusting operation, so that the pitch reaches the required value, and then starts the sewing. After sewing is finished, the thread cutting action or the presser foot lifting action can be carried out according to the requirement. Before the thread trimming operation, the pitch adjusting ball 721 passes through the end of the pitch adjusting section 431 and the first transition section 432 to reach the end of the first transition section 432, so that the pitch is adjusted to 0 (approximately +0.5mm), and the encrypted stitch operation can be performed, and therefore, the first transition section 432 is also an action section of the pitch adjusting profile surface 43 for adjusting the pitch. When the thread cutting action or the presser foot lifting action is performed, the stitch adjusting ball 721 can enter the first arc section 433 from the first transition section 432 and then enter the second transition section 434 to perform the thread cutting action and the presser foot lifting action in sequence, and the stitch adjusting ball 721 can also enter the second arc section 435 from the stitch adjusting section 431 to perform the presser foot lifting action directly. When the stitch length adjusting ball 721 is located at the first arc section 433, the second transition section 434 or the second arc section 435, the stitch length will change correspondingly with the movement of the stitch length adjusting ball 721 along the stitch length adjusting contour surface 43, but since the sewing is stopped, the change of the stitch length will not affect and interfere with the trimming and presser foot lifting actions.
Referring to fig. 12, in the present embodiment, the rotating shaft 30 of the power member 3 is divided into three driving sections, namely, a stitch adjusting section a, a trimming section b and a presser foot lifting section c, wherein the presser foot lifting section c is divided into a first presser foot lifting section c1 and a second presser foot lifting section c2 in equal halves. Correspondingly, the needle space section a corresponds to the needle space adjustment section 431 and the first transition section 432 of the needle space profile 43, see fig. 11. Referring to fig. 9, the trimming line section b corresponds to the trimming line segment 412 of the trimming line contour surface 41. Referring to fig. 10, the presser foot lifting interval c corresponds to the first presser foot lifting section 422 and the second presser foot lifting section 423 of the presser foot profile surface 42, wherein the first presser foot lifting interval c1 corresponds to the first presser foot lifting section 422, and the second presser foot lifting interval c2 corresponds to the second presser foot lifting section 423. Herein, the rotating direction of the rotating shaft 30 of the power unit 3 is based on the view from the front of the head of the sewing machine.
In this embodiment, the matching relationship of the angles between the trimming contour surface 41, the presser foot lifting contour surface 42 and the stitch adjusting contour surface 43, that is, the relative positions of the three, should satisfy: when the rotating shaft 30 of the power part 3 is located in the needle distance adjusting interval a, the needle distance adjusting ball 721 is located in the needle distance adjusting section 431 or the first transition section 432 of the needle distance adjusting contour surface 43, the needle distance adjusting section 431 or the first transition section 432 can drive the needle distance adjusting driving crank 72 to swing, the needle distance adjusting mechanism is driven to execute the needle distance adjusting action, and the required needle distance is obtained, at this time, the trimming ball 521 is located in the trimming base circle section 411 of the trimming contour surface 41, the trimming driving crank 52 executes the idle stroke, the trimming mechanism does not operate, meanwhile, the presser foot lifting ball 621 is located in the presser foot lifting base circle section 421 of the presser foot contour surface 42, the presser foot lifting driving crank 62 executes the idle stroke, and the presser foot lifting mechanism does not operate; when the rotating shaft 30 of the power member 3 is located in the trimming interval b, the trimming ball 521 is located in the trimming section 412 of the trimming contour surface 41, and the trimming section 412 can drive the trimming driving crank 52 to swing to drive the trimming mechanism to perform trimming, at this time, the stitch adjusting ball 721 is located in the first arc section 433, so that the trimming is not interfered, meanwhile, the presser foot lifting ball 621 is located in the presser foot lifting base circle section 421 of the presser foot lifting contour surface 42, the presser foot lifting driving crank 62 performs idle stroke, and the presser foot lifting mechanism does not operate; when the rotating shaft 30 of the power member 3 is located in the presser foot lifting interval c, the presser foot lifting ball 621 is located in the first presser foot lifting section 422 or the second presser foot lifting section 423 of the presser foot contour surface 42, the presser foot lifting driving crank 62 can be driven by the first presser foot lifting section 422 or the second presser foot lifting section 423 to swing, the presser foot lifting mechanism is driven to execute the presser foot lifting action, at this time, the stitch adjusting ball 721 is located in the second transition section 434 or the second arc section 435, the presser foot lifting action is not interfered, meanwhile, the trimming ball 521 is located in the trimming base circle section 411 of the trimming contour surface 41, the trimming driving crank 52 executes the idle stroke, and the trimming mechanism does not operate. Therefore, the purposes that the thread cutting action, the presser foot lifting action and the needle pitch adjusting action do not interfere with each other are achieved.
Based on above-mentioned sewing machine trimming lifts presser foot roll adjustment device, this embodiment still provides a sewing machine, and the sewing machine of this embodiment includes the above-mentioned sewing machine trimming of this embodiment lifts presser foot roll adjustment device.
The working method of the sewing machine adopting the thread trimming, presser foot lifting and needle distance adjusting device of the sewing machine comprises the following steps:
step S1, starting the sewing machine.
In step S2, the controller controls the rotating shaft 30 of the power member 3 to rotate and return to the initial position, and drives the first cam 401 and the second cam 402 to rotate and return to the initial position. In this initial position, the device is in a default parameter state set by the controller: the rotating shaft 30 of the power member 3 is located at a default angle in the stitch length adjustment interval a, the stitch length adjusting ball 721 is located at a default position on the stitch length adjustment section 431 of the stitch length adjustment contour surface 43, the stitch length is a default value corresponding to the default position in the range of (-N, + N) stitch length, the trimming ball 521 is located at the trimming base circle section 411 of the trimming contour surface 41, and the presser foot lifting ball 621 is located at the presser foot lifting base circle section 421 of the presser foot lifting contour surface 42.
And step S3, judging whether the stitch length is adjusted, namely judging whether the default stitch length needs to be adjusted to obtain the required initial stitch length value. If the stitch length is required to be adjusted, a stitch length adjusting signal can be manually input from a control panel of the sewing machine, the controller transmits the stitch length adjusting signal to the power member, the controller controls the rotating shaft 30 of the power member 3 to rotate in the stitch length adjusting section a according to the stitch length adjusting signal, so that the stitch length adjusting ball 721 moves along the stitch length adjusting section 431 of the stitch length adjusting contour surface 43 to drive the stitch length adjusting driving crank 72 to swing, and drive the stitch length adjusting mechanism to perform the stitch length adjusting action, when the stitch length is adjusted to the required initial stitch length value in the (-N, + N) stitch length range, namely, the parameter requirement of the stitch length adjusting signal is met, the controller controls the rotating shaft 30 of the power member 3 to stop rotating, the stitch length adjustment is completed, and then the next step S4 is performed. In the stitch length adjusting process, the trimming ball 521 is located at the trimming base circle segment 411 of the trimming contour surface 41, the trimming driving crank 52 executes an idle stroke, the presser foot lifting ball 621 is located at the presser foot lifting base circle segment 421 of the presser foot lifting contour surface 42, the presser foot lifting driving crank 62 executes an idle stroke, and neither the trimming mechanism nor the presser foot lifting mechanism is operated. If the stitch length adjustment is not required, the process proceeds directly to the next step S4.
Step S4, the sewing machine starts the sewing work until the sewing is finished. Preferably, when the sewing starts, the controller controls the rotating shaft 30 of the power part 3 to rotate clockwise from the stitch adjusting interval a to enter a second presser foot lifting interval c2 in the presser foot lifting interval c, and rotate within a small angle in the second presser foot lifting interval c2, so that the presser foot lifting ball 621 enters a second presser foot lifting section 423 from the presser foot lifting base circle segment 421, and runs a small distance along the second presser foot lifting section 423, the presser foot lifting driving crank 62 is driven to perform a small-amplitude presser foot lifting action, and the acting force is transmitted to the presser foot through the presser foot lifting mechanism, so that the presser foot pressure during sewing can be controlled, the effect of slightly lifting the sewing is achieved, the bad working condition that the sewing and the thread breaking occur due to the dead pressing of the presser foot is avoided, and the sewing and thread breaking rate is effectively reduced. In the process, the pitch adjusting ball 721 leaves the pitch adjusting section 431 and enters the second circular arc section 435, the pitch is maintained at the maximum value + N, the trimming ball 521 is located at the trimming base circular section 411 of the trimming contour surface 41, the trimming driving crank 52 performs an idle stroke, and the trimming mechanism does not act. Then, the controller controls the rotating shaft 30 of the power member 3 to rotate counterclockwise back to the needle pitch adjusting section a, so that the needle pitch adjusting ball 721 returns to the position of the needle pitch adjusting section 431 corresponding to the initial needle pitch value, the presser foot lifting ball 621 returns to the presser foot lifting base circle section 421, and then the rotating shaft 30 of the power member 3 stops rotating and normal sewing is started until the sewing is completed.
And step S5, after the sewing is finished, judging whether to cut the thread. If the thread cutting is needed, the controller can control the rotating shaft 30 of the power member 3 to rotate anticlockwise from the stitch adjusting interval a to the thread cutting interval b. In the rotating process, the stitch length adjusting ball 721 firstly passes through the end of the stitch length adjusting section 431 and the first transition section 432 to reach the end of the first transition section 432, at this time, the stitch length is transited to 0 (which may be approximately +0.5mm), and a caulking seam (such as a caulking seam of 2 needles) may be performed, in the process, the trimming ball 521 is still located at the trimming base circle section 411 of the trimming profile surface 41, the trimming driving crank 52 performs an idle stroke, the trimming mechanism does not operate, the presser foot lifting ball 621 is still located at the presser foot lifting base circle section 421 of the presser foot lifting profile surface 42, the presser foot lifting driving crank 62 performs an idle stroke, and the presser foot lifting mechanism does not operate. After the encryption seam is finished, the controller controls the rotating shaft 30 of the power member 3 to continue to rotate counterclockwise to enter the trimming section b, so that the trimming ball 521 enters the trimming section 412 from the trimming base circle section 411, the trimming driving crank 52 and the trimming mechanism start to perform the trimming action until the trimming ball 521 reaches the end of the trimming section 412, the trimming action is finished, and then the next step S6 is carried out. During the thread trimming process, the needle pitch adjusting ball 721 moves in the first arc section 433, the needle pitch is kept to be 0, the presser foot lifting ball 621 is still positioned at the presser foot lifting base circle section 421 of the presser foot lifting contour surface 42, the presser foot lifting driving crank 62 executes the idle stroke, and the presser foot lifting mechanism does not operate. If no trimming is required, the process proceeds directly to the next step S6.
And step S6, judging whether the presser foot is lifted. If the presser foot is required to be lifted, a presser foot lifting signal can be transmitted to the power part by the controller, the controller controls the rotating shaft 30 of the power part 3 to rotate to the presser foot lifting interval c according to the presser foot lifting signal, the presser foot lifting ball 621 enters the first presser foot lifting section 422 or the second presser foot lifting section 423 from the presser foot lifting base circle section 421, and the presser foot lifting driving crank 62 and the presser foot lifting mechanism are driven to carry out the presser foot lifting action. Specifically, the presser foot lifting action is divided into two situations: the presser foot is lifted under the condition of not executing the thread trimming action and the presser foot is lifted after the thread trimming action is finished.
If the presser foot needs to be lifted without executing the thread trimming operation, the controller can control the rotating shaft 30 of the power part 3 to rotate clockwise from the stitch adjusting interval a to enter a second presser foot lifting interval c2 in the presser foot lifting interval c, so that the presser foot lifting ball 621 enters a second presser foot lifting section 423 from the presser foot lifting base circle section 421, the second presser foot lifting section 423 drives the presser foot lifting driving crank 62 and the presser foot lifting mechanism to execute the presser foot lifting operation, and when the presser foot is lifted to a required height, the controller controls the rotating shaft 30 of the power part 3 to stop rotating, the presser foot lifting operation is completed, and then the related operation can be manually performed. In the process, the pitch adjusting ball 721 leaves the pitch adjusting section 431 and enters the second circular arc section 435, the pitch is maintained at the maximum value + N, the trimming ball 521 is located at the trimming base circular section 411 of the trimming contour surface 41, the trimming driving crank 52 performs an idle stroke, and the trimming mechanism does not act. After the manual operation is finished, the controller controls the rotating shaft 30 of the power member 3 to rotate anticlockwise to return from the second presser foot lifting interval c2 to the needle pitch adjusting interval a, the presser foot lifting ball 621 returns from the second presser foot lifting section 423 to the presser foot lifting base circle section 421, and drives the presser foot lifting driving crank 62 and the presser foot lifting mechanism to reset, so that the presser foot descends to the initial position, the needle pitch adjusting ball 721 returns from the second circular arc section 435 to the needle pitch adjusting section 431, and then the next step S7 is performed.
If the presser foot needs to be lifted after the thread trimming action is finished, the rotating shaft 30 of the power part 3 can be controlled by the controller to continuously rotate anticlockwise, the thread trimming interval b enters a first presser foot lifting interval c1 in the presser foot lifting interval c, the presser foot lifting ball 621 enters a first presser foot lifting section 422 from a presser foot lifting base circle section 421, the presser foot lifting driving crank 62 and the presser foot lifting mechanism are driven by the first presser foot lifting section 422 to execute the presser foot lifting action, and when the presser foot is lifted to a required height, the controller controls the rotating shaft 30 of the power part 3 to stop rotating, the presser foot lifting action is finished, and then related operations (such as cloth taking out) can be carried out manually. In the process, the needle pitch adjusting ball 721 enters the second transition section 434 from the first circular arc section 433, when the pressure lifting and pressing ball 621 reaches the highest point of the first pressure lifting and pressing section 422, the needle pitch adjusting ball 721 reaches the tail end of the second transition section 434, and the needle pitch is transited from 0 to the maximum value + N; the thread cutting ball 521 crosses the end of the thread cutting segment 412 and the concave segment 413 to reach the thread cutting base circle segment 411, and simultaneously, the thread cutting driving crank 52 and the thread cutting mechanism are reversely moved and reset under the action of the thread cutting mechanism reset spring. After the manual operation is finished, the controller controls the rotating shaft 30 of the power part 3 to continue to rotate anticlockwise, the pressure foot lifting ball 621 enters the pressure foot lifting base circle section 421 through the second pressure foot lifting interval c2, the pressure foot lifting ball 621 drives the pressure foot lifting driving crank 62 and the pressure foot lifting mechanism to reset, the pressure foot descends to the initial position, the needle distance adjusting ball 721 enters the needle distance adjusting section 431 through the second circular arc section 435, and the next step S7 is then performed.
If the presser foot does not need to be lifted, the process proceeds to the next step S7.
In step S7, the controller controls the rotating shaft 30 of the power member 3 to rotate reversely to the original gauge value. If the thread cutting operation and the presser foot lifting operation are not performed before step S7, the sewing is continued, and the process proceeds to the next step S8. If the presser foot raising operation is performed before step S7, the process proceeds directly to the next step S8. If the thread trimming operation is performed and the presser foot lifting operation is not performed before step S7, the controller controls the rotating shaft 30 of the power element 3 to rotate clockwise in step S7, and the thread trimming section b to rotate back to the pitch adjustment section a, and the pitch adjustment ball 721 is returned to the position where the pitch adjustment section 431 corresponds to the required pitch value, and after the pitch is adjusted to the required pitch value, the controller controls the rotating shaft 30 of the power element 3 to stop rotating, and the process proceeds to next step S8. In the process, the trimming ball 521 moves reversely along the trimming contour surface 41, returns to the trimming base circle segment 411 from the trimming segment 412, drives the trimming driving crank 52 and the trimming mechanism to reset, the presser foot lifting ball 621 is located at the presser foot lifting base circle segment 421 of the presser foot lifting contour surface 42, the presser foot lifting driving crank 62 executes an idle stroke, and the presser foot lifting mechanism does not operate.
And step S8, judging whether to continue sewing, if so, returning to step S3, and if not, entering the next step S9.
And step S9, ending sewing.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a sewing machine trimming lifts presser foot and adjusts stitch length device which characterized in that includes:
a power member (3);
a first cam (401) connected with the power member (2) and driven by the power member (2) to rotate, wherein the first cam is used for rotating the power member (2)
The first cam (401) has a trimming contour surface (41);
the second cam (402) is connected with the power part (2) and driven by the power part (2) to rotate, and the second cam (402) is provided with a pressure foot lifting profile surface (42) and a needle pitch adjusting profile surface (43);
the trimming driving crank (52) is connected with the trimming mechanism, a trimming ball (521) is arranged on the trimming driving crank (52), and the trimming ball (521) is matched with the trimming contour surface (41) of the first cam (401);
the presser foot lifting mechanism comprises a presser foot lifting driving shaft (61), a presser foot lifting crank (63) and a push rod (64), the presser foot lifting driving shaft (61) is rotatably supported on a bottom plate (1) of the sewing machine, the presser foot lifting driving crank (62) is fixedly arranged on the presser foot lifting driving shaft (61), one end of the presser foot lifting crank (63) is fixedly arranged on the presser foot lifting driving shaft (61), the other end of the presser foot lifting crank is abutted against the bottom end of the push rod (64), and the top end of the push rod (64) is connected with a presser foot lifting assembly;
the needle pitch adjusting driving crank (72) is connected with the needle pitch adjusting mechanism, a needle pitch adjusting ball (721) is arranged on the needle pitch adjusting driving crank (72), and the needle pitch adjusting ball (721) is matched with the needle pitch adjusting contour surface (43) of the second cam (402).
2. The device for lifting and adjusting the needle distance of the thread trimming presser foot of the sewing machine according to claim 1, wherein the presser foot lifting contour surface (42) is located on the outer periphery of the second cam (402), and the needle distance adjusting contour surface (43) is located on one side of the second cam (402).
3. The device for lifting and adjusting the needle distance of the presser foot of the sewing machine according to claim 1, wherein the thread cutting mechanism comprises a thread cutting driving shaft (51), the thread cutting driving shaft (51) is rotatably supported on the base plate (1) of the sewing machine, the thread cutting driving crank (52) is fixedly arranged on the thread cutting driving shaft (51), and the thread cutting driving shaft (51) is connected with the thread cutting assembly.
4. The device for adjusting the needle distance of the thread lifting and pressing foot of the sewing machine according to claim 3, wherein the thread cutting mechanism further comprises a thread cutting crank (53) and a thread cutting connecting rod (54), one end of the thread cutting crank (53) is fixedly arranged on the thread cutting driving shaft (51), the other end of the thread cutting crank is hinged with one end of the thread cutting connecting rod (54), and the other end of the thread cutting connecting rod (54) is connected with the thread cutting assembly.
5. The device for lifting and adjusting the stitch length of the presser foot of a sewing machine according to claim 1, characterized in that a cushion is provided between the presser foot lifting crank (63) and the carrier rod (64).
6. The device for lifting and adjusting the needle distance of the presser foot of the thread trimming of the sewing machine as claimed in claim 1, wherein the needle distance adjusting mechanism comprises a needle distance adjusting driving shaft (71), a needle distance adjusting crank (73), a needle distance adjusting connecting rod (74) and a needle distance adjusting swing plate seat (75), the needle distance adjusting driving shaft (71) is rotatably supported on the bottom plate (1) of the sewing machine, the needle distance adjusting driving crank (72) is fixedly arranged on the needle distance adjusting driving shaft (71), one end of the needle distance adjusting crank (73) is fixedly arranged on the needle distance adjusting driving shaft (71), the other end of the needle distance adjusting crank is hinged with one end of the needle distance adjusting connecting rod (74), the other end of the needle distance adjusting connecting rod (74) is hinged with the needle distance adjusting swing plate seat (75), and the needle distance adjusting swing plate seat (75) is connected with a needle distance adjusting component.
7. The device for adjusting the needle distance of the thread trimming lifting and pressing foot of the sewing machine according to claim 1, wherein the power member (3) is a motor with double output shafts, and the first cam (401) and the second cam (402) are respectively arranged on the rotating shafts (30) at two sides of the motor with the double output shafts.
8. A sewing machine characterized by comprising the thread trimming, presser foot lifting and stitch length adjusting device of the sewing machine according to any one of claims 1 to 7.
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|---|---|---|---|
| CN201910098254.4A CN111501216B (en) | 2019-01-31 | 2019-01-31 | Sewing machine trimming, presser foot lifting and needle distance adjusting device and sewing machine |
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| CN201910098254.4A CN111501216B (en) | 2019-01-31 | 2019-01-31 | Sewing machine trimming, presser foot lifting and needle distance adjusting device and sewing machine |
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| CN111501216B true CN111501216B (en) | 2022-01-11 |
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| CN112064222B (en) * | 2020-10-16 | 2022-01-28 | 杰克缝纫机股份有限公司 | Sewing machine |
| CN115247323B (en) * | 2021-04-28 | 2023-06-20 | 杰克科技股份有限公司 | Sewing machine control method |
| CN115522325A (en) * | 2022-11-11 | 2022-12-27 | 浙江美机缝纫机有限公司 | Presser foot lifting and needle distance adjusting mechanism on sewing machine and sewing machine |
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