CN111501222B - Thread trimming and stitch length adjusting device of sewing machine and sewing machine - Google Patents
Thread trimming and stitch length adjusting device of sewing machine and sewing machine Download PDFInfo
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- CN111501222B CN111501222B CN201910097835.6A CN201910097835A CN111501222B CN 111501222 B CN111501222 B CN 111501222B CN 201910097835 A CN201910097835 A CN 201910097835A CN 111501222 B CN111501222 B CN 111501222B
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- trimming
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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
- D05B55/00—Needle holders; Needle bars
- D05B55/10—Needle bars for multiple-needle sewing machines
- D05B55/12—Needle bars for multiple-needle sewing machines with provision for varying the distance between the needles
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
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- Mechanical Engineering (AREA)
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Abstract
The invention relates to the technical field of sewing machines, in particular to a thread trimming and stitch length adjusting device of a sewing machine and the sewing machine comprising the same. The device comprises a power part; the cam is provided with a trimming profile surface and a needle pitch adjusting profile surface, and the power part is connected with the cam and drives the cam to rotate; 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 cam; the needle pitch adjusting driving crank is connected with the needle pitch adjusting mechanism, and needle pitch adjusting balls are arranged on the needle pitch adjusting driving crank and matched with the needle pitch adjusting contour surface of the cam. The power part drives the cam to rotate, the corresponding thread cutting mechanism or the needle pitch adjusting mechanism can be driven to move through the angle matching of the thread cutting profile surface and the needle pitch adjusting profile surface on the cam, thread cutting action or needle pitch adjusting action is executed, namely, the power part drives the cam to realize two functions of thread cutting and needle pitch adjusting, the structure is simple, and the transmission efficiency is high.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a thread trimming and stitch length 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 cutting and automatic needle distance adjustment in the sewing process. The common mode is that the thread trimming mechanism is driven to act independently through an electromagnet to realize the automatic thread trimming function, and in addition, the needle pitch adjusting mechanism is driven to act through a stepping motor to realize the automatic needle pitch adjusting function. 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 and needle pitch 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 and needle pitch adjusting device of a sewing machine comprises: a power member; the cam is provided with a trimming profile surface and a needle pitch adjusting profile surface, and the power part is connected with the cam and drives the cam to rotate; 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 cam; the needle pitch adjusting driving crank is connected with the needle pitch adjusting mechanism, and needle pitch adjusting balls are arranged on the needle pitch adjusting driving crank and matched with the needle pitch adjusting contour surface of the cam.
Preferably, the trimming profile surface and the stitch adjusting profile surface are respectively positioned on two sides of the 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 front crank, a thread trimming crank connecting rod, a thread trimming rear crank and a thread trimming crank shaft, and the thread trimming crank shaft is rotatably supported on the bottom plate and is parallel to the thread trimming driving shaft; one end of the front trimming crank is fixedly arranged on the trimming driving shaft, the other end of the front trimming crank is hinged with one end of the trimming crank connecting rod, the other end of the trimming crank connecting rod is hinged with one end of the rear trimming crank, the other end of the rear trimming crank is fixedly arranged at one end of the trimming crank shaft, and the other end of the trimming crank shaft is connected with the trimming assembly.
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 member is a stepping motor or a servo motor.
The invention also provides a sewing machine which comprises the thread cutting and stitch length adjusting device of the sewing machine.
Compared with the prior art, the invention has the remarkable progress that:
the invention relates to a thread cutting and stitch length adjusting device of a sewing machine and the sewing machine comprising the device, wherein a power part drives a cam to rotate, and through the angle matching of a thread cutting profile surface and a stitch length adjusting profile surface on the cam, a corresponding thread cutting mechanism or a corresponding stitch length adjusting mechanism can be driven to move to execute thread cutting action or stitch length adjusting action, namely, two functions of thread cutting and stitch length adjusting are realized by one cam, so that the structure can be greatly simplified, the structure is simple and compact, the transmission efficiency is high, and the stability is good.
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 and stitch length adjusting device of a sewing machine according to an embodiment of the present invention.
Fig. 3 is a schematic view of the cam in the embodiment of the present invention as seen from one direction.
Fig. 4 is a schematic structural view of the cam in the embodiment of the present invention, viewed from another direction.
Fig. 5 is a schematic structural diagram of a thread trimming mechanism, a thread trimming driving crank and a cam in the embodiment of the invention.
FIG. 6 is a schematic view of the needle pitch adjusting mechanism, the needle pitch adjusting driving crank and the cam in the embodiment of the invention.
Fig. 7 is a schematic diagram of the configuration of the shear profile of the cam in an embodiment of the present invention.
Fig. 8 is a schematic structural view of a pitch profile of a cam in an embodiment of the present invention.
Wherein the reference numerals are as follows:
1. bottom plate 2, oil pan
3. Power part 31 and bracket
4. Cam 401 and trimming cam body
402. Cam body 403 and needle pitch adjusting cam body
404. Arc-shaped limiting part 405 and annular limiting part
41. Trimming contour surface 411, trimming base circle segment
412. Cut line segment 413, sunken segment
42. Needle pitch adjusting contour surface 421 and needle pitch adjusting section
422. First transition section 423 and first arc section
424. Second transition section 425, second arc section
51. Thread cutting drive shaft 52, thread cutting drive crank
521. Trimming ball 53, trimming front crank
54. Trimming crank connecting rod 55 and trimming rear crank
56. Trimming crank shaft 571 and trimming crank
572. Trimming connecting rod 573 and movable knife rest
574. Moving knife 575 and fixed knife
61. Needle pitch adjusting drive shaft 62 and needle pitch adjusting drive crank
621. Pin pitch adjusting ball 63 and pin pitch adjusting crank
64. Needle pitch adjusting connecting rod 65 and needle pitch adjusting swing plate seat
66. Connecting rod structure 67 and feeding structure
68. 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 8, an embodiment of the present invention provides a thread cutting and stitch length adjusting device for a sewing machine. The thread cutting and stitch length adjusting device of the sewing machine is installed in the sewing machine and used for achieving the thread cutting function and the stitch length 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 and stitch length adjusting apparatus of the sewing machine of the present embodiment is installed on the base plate 1.
Referring to fig. 2, the thread cutting and stitch length adjusting device of the sewing machine of the present embodiment includes a power member 3, a cam 4, a thread cutting driving crank 52, a thread cutting mechanism, a stitch length adjusting driving crank 62, and a stitch length adjusting mechanism.
The power part 3 is fixedly supported on the bottom plate 1 of the sewing machine through the bracket 31, the power part 3 is connected with the cam 4, the power part 3 is provided with a rotating shaft, the cam 4 is fixedly arranged on the rotating shaft of the power part 3, and the rotation of the rotating shaft of the power part 3 drives the cam 4 to synchronously rotate along with the rotating shaft. The angle of the power part 3 driving the cam 4 to rotate is controllable, and preferably, the power part 3 can be a stepping motor or a servo motor, so that the accurate control of the rotation angle of the cam 4 can be realized. Referring to fig. 3 and 4, the cam 4 in this embodiment has a shear profile surface 41 and a pitch profile surface 42. Preferably, the trimming profile surface 41 and the stitch length adjusting profile surface 42 are respectively located on two sides of the cam 4, in this embodiment, the trimming profile surface 41 is located on the left side of the cam 4, and the stitch length adjusting profile surface 42 is located on the right side of the cam 4.
Referring to fig. 2 and 5, 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 cam 4. 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 cam 4 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 part 3 drives the cam 4 to rotate, the trimming contour surface 41 of the cam 4 rotates around the axis of the rotating shaft of the power part 3, the trimming driving crank 52 is driven to swing through 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 execute the trimming action.
In the present embodiment, preferably, referring to fig. 2 and 5, 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 rotation axis 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 cam 4 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 execute the trimming action. Further, the thread trimming mechanism further comprises a thread trimming front crank 53, a thread trimming crank connecting rod 54, a thread trimming rear crank 55 and a thread trimming crank shaft 56, wherein the thread trimming crank shaft 56 is rotatably supported on the bottom plate 1, and the thread trimming crank shaft 56 is parallel to the thread trimming driving shaft 51. One end of the trimming front crank 53 is fixedly arranged at the left end of the trimming driving shaft 51, the other end of the trimming front crank 53 is hinged with one end of the trimming crank connecting rod 54, the other end of the trimming crank connecting rod 54 is hinged with one end of the trimming rear crank 55, the other end of the trimming rear crank 55 is fixedly arranged at the right end of the trimming crank shaft 56, and the left end of the trimming crank shaft 56 is connected with the trimming component. When the thread cutting driving shaft 51 rotates, the thread cutting crank shaft 56 can be driven to rotate along with the rotation of the thread cutting front crank 53, the thread cutting crank connecting rod 54 and the thread cutting rear crank 55, and the rotation of the thread cutting crank shaft 56 drives the thread cutting assembly to move so as to perform thread cutting. 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 cutting assembly may include a thread cutting crank 571, a thread cutting connecting rod 572, a movable knife holder 573, a movable knife 574, and a fixed knife 575, wherein one end of the thread cutting crank 571 is hinged to the left end of the thread cutting crank 56, the other end of the thread cutting crank 571 is hinged to one end of the thread cutting connecting rod 572, the other end of the thread cutting connecting rod 572 is hinged to the movable knife holder 573, the movable knife 574 is mounted on the movable knife holder 573, and the fixed knife 575 is fixedly mounted on the base plate 1, so that when the thread cutting crank 56 rotates, the movable knife 574 is driven by the transmission of the thread cutting crank 571 and the thread cutting connecting rod 572 to move relative to the fixed knife 575, thereby performing a thread cutting operation. 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 6, the needle pitch driving crank 62 is provided with a needle pitch ball 621, and the needle pitch ball 621 is matched with the needle pitch contour surface 42 of the cam 4. The pitch ball 621 may be fixedly mounted on the pitch driving crank 62, or may be rollably mounted on the pitch driving crank 62, in this embodiment, the pitch ball 621 is preferably rollably mounted on the pitch driving crank 62, so as to reduce the friction between the pitch ball 621 and the pitch profile surface 42 of the cam 4 when the pitch ball 621 is engaged with the pitch profile surface. The needle pitch drive crank 62 is connected to the needle pitch mechanism. When the power member 3 drives the cam 4 to rotate, the needle adjusting profile surface 42 of the cam 4 rotates around the axis of the rotating shaft of the power member 3, the needle adjusting driving crank 62 is driven to swing through the action of the needle adjusting profile surface 42 on the needle adjusting ball 621, and the swinging of the needle adjusting driving crank 62 drives the needle adjusting mechanism to move so as to execute the needle adjusting action. The accurate adjustment of the needle pitch can be realized by controlling the rotating angle of the cam 4 by the power part 3.
In the present embodiment, preferably, referring to fig. 2 and 6, the needle pitch adjusting mechanism includes a needle pitch adjusting driving shaft 61, a needle pitch adjusting crank 63, a needle pitch adjusting connecting rod 64 and a needle pitch adjusting swing plate seat 65, the needle pitch adjusting driving shaft 61 is rotatably supported on the bottom plate 1, and the needle pitch adjusting driving shaft 61 is parallel to the rotating shaft of the power member 3. The needle pitch adjusting driving crank 62 is fixedly arranged at the left end of the needle pitch adjusting driving shaft 61, one end of the needle pitch adjusting crank 63 is fixedly arranged at the right end of the needle pitch adjusting driving shaft 61, the other end of the needle pitch adjusting crank 63 is hinged with one end of a needle pitch adjusting connecting rod 64 through a needle pitch adjusting connecting pin 68, the other end of the needle pitch adjusting connecting rod 64 is hinged with a needle pitch adjusting swing plate seat 65, and the needle pitch adjusting swing plate seat 65 is connected with a needle pitch adjusting assembly. When the cam 4 drives the needle pitch adjusting driving crank 62 to swing, the needle pitch adjusting driving shaft 61 is driven to rotate by the swinging of the needle pitch adjusting driving crank 62, when the needle pitch adjusting driving shaft 61 rotates, the needle pitch adjusting swinging plate seat 65 can be driven to rotate by the transmission belts of the needle pitch adjusting crank 63 and the needle pitch adjusting connecting rod 64, and the needle pitch adjusting assembly is driven to move by the rotation of the needle pitch adjusting swinging plate seat 65 to execute the needle pitch adjusting action. The needle pitch adjusting component can be a connecting rod structure 66 and a feeding structure 67 which can realize the needle pitch adjusting action in the prior art.
The thread cutting and stitch length adjusting device of the sewing machine in the embodiment drives the cam 4 to rotate by the power part 3, and through the angle matching of the thread cutting profile surface 41 and the stitch length adjusting profile surface 42 on the cam 4, the corresponding thread cutting mechanism or the corresponding stitch length adjusting mechanism can be driven to move to execute thread cutting action or stitch length adjusting action, namely, two functions of thread cutting and stitch length adjusting are realized by the cam 4, 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 in the figure), 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 matching state between the trimming profile surface 41 of the cam 4 and the trimming ball 521, and the matching state between the stitch-adjusting profile surface 42 and the stitch-adjusting ball 621, and to realize the precise control of the trimming operation and the stitch-adjusting 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 and 4, the cam 4 in this embodiment includes a thread trimming cam body 401, a cam body 402, and a needle adjustment cam body 403, where the cam body 402 is a disc cam, and the thread trimming cam body 401 and the needle adjustment cam body 403 are respectively located on left and right sides of the cam body 402 and are both coaxial with the cam body 402, that is, the thread trimming cam body 401, the cam body 402, and the needle adjustment cam body 403 rotate around the same rotation center. Preferably, the trimming cam body 401, the cam body 402 and the needle pitch cam body 403 are an integrally formed integral piece, that is, the cam 4 is an integrally formed integral piece. Of course, the cam 4 may only include the thread trimming cam body 401 and the needle pitch cam body 403, and the thread trimming cam body 401 and the needle pitch cam body 403 may be separate pieces coaxially arranged.
Referring to fig. 3 and 7, the outer peripheral surface of the trimming cam body 401 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 401, the distance between the trimming segment 412 and the rotation center of the trimming cam body 401 gradually increases, and the concave segment 413 protrudes toward the inside of the trimming cam body 401, so that the end of the trimming segment 412 is the highest point of the trimming contour surface 41. During one rotation of the cam 4, 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 cam 4, 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 cam 4 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 reversely move 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 cutting operation is completed, if the cam 4 rotates reversely, the thread cutting ball 521 will move reversely along the thread cutting section 412, and drive the thread cutting driving crank 52 and the thread cutting mechanism to reset.
Preferably, the cam 4 is provided with an arc-shaped limiting portion 404, the arc-shaped limiting portion 404 is arranged at the outer edge of the left side surface of the cam body 402, the inner side surface of the arc-shaped limiting portion 404 and the trimming section 412 of the trimming contour surface 41 are oppositely arranged at intervals, 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, the trimming ball 521 is ensured to roll along the trimming section 412, and thus the accurate execution of the trimming action is ensured. Preferably, referring to fig. 8, a portion of the trimming section 412 near the end of the trimming section 412 is an arc section AB, an inner side surface of the arc-shaped limiting portion 404 opposite to the arc section AB is an arc section CD, and the arc section CD and the arc section AB are concentric arcs, so as to optimize the limiting effect.
In a specific embodiment, the trimming line segment 412 is formed by sequentially connecting an arc with a radius of 40mm, a straight line with a length of 3.11mm, and an arc with a radius of 8.96mm, wherein the arc segment AB has a radius of 8.96mm, and the arc segment CD of the arc-shaped limiting part 404 has a radius of 14 mm.
Referring to fig. 4, the outer peripheral surface of the needle pitch cam body 403 is a needle pitch contour surface 42, and during one rotation of the cam 4, the needle pitch balls 621 are always in contact with the needle pitch contour surface 42, and influence is exerted on the needle pitch by the needle pitch contour surface 42. In this embodiment, preferably, the cam 4 is provided with an annular limiting portion 405, the annular limiting portion 405 is disposed at an outer edge of the right side surface of the cam body 402, an inner circumferential surface of the annular limiting portion 405 and the needle pitch adjusting profile surface 42 are disposed opposite to each other at an interval, an annular track groove is formed between the inner circumferential surface of the annular limiting portion 405 and the needle pitch adjusting profile surface 42, the needle pitch adjusting ball 621 moves along the annular track groove, the annular limiting portion 405 can limit the movement of the needle pitch adjusting ball 621, and the needle pitch adjusting ball 621 is ensured to move along the needle pitch adjusting profile surface 42, so that the needle pitch adjusting action is accurately performed. Preferably, the center of the right side of the cam body 402 is recessed inward, so that the outer edge of the right side of the cam body 402 forms the annular limiting portion 405, and the needle adjusting cam body 403 is disposed at the central recess of the right side of the cam body 402 and spaced from the inner circumferential surface of the annular limiting portion 405 to form the annular track groove.
Referring to fig. 8, the needle pitch adjusting contour surface 42 includes a needle pitch adjusting section 421, a first transition section 422, a first arc section 423, a second transition section 424, and a second arc section 425, which are sequentially connected in a circumferential direction to form a circle. The distance between the needle pitch adjusting section 421 and the rotation center of the needle pitch adjusting cam body 403 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 422 and the center of rotation of the pitch cam body 403 gradually decreases, and the corresponding pitch gradually increases from the minimum value-N to 0. The end of the needle pitch adjusting section 421, i.e. the intersection point of the needle pitch adjusting section 421 and the first transition section 422, is the highest point of the needle pitch adjusting contour surface 42. The first arc segment 423 is an arc segment provided concentrically with the rotation center of the needle pitch adjusting cam body 403, and the corresponding needle pitch is maintained at 0. The distance between the second transition section 424 and the rotation center of the needle pitch adjusting cam body 403 gradually decreases, and the corresponding needle pitch gradually increases from 0 to a maximum value + N. The second arc segment 425 is an arc segment concentrically disposed with the rotation center of the needle pitch adjusting cam body 403, and the corresponding needle pitch is maintained at the maximum value + N. The needle pitch adjusting section 421 is a main action section of the needle pitch adjusting contour surface 42, and can realize the adjustment of the working needle pitch of the sewing machine within the range of (-N, + N) needle pitch. When the needle pitch adjusting ball 621 is located at the needle pitch adjusting section 421, the needle pitch adjusting driving crank 62 swings under the driving of the needle pitch adjusting section 421 along with the rotation of the cam 4, the needle pitch adjusting mechanism is driven to perform the needle pitch adjusting operation, the needle pitch is made to reach the required value, and then the sewing is started. After the sewing is finished, the thread cutting action can be carried out according to the requirement. Before the thread trimming operation, the pitch adjusting balls 621 pass through the end of the pitch adjusting section 421 and the first transition section 422 to reach the end of the first transition section 422, so that the pitch is adjusted to 0 (approximately +0.5mm), and the encryption sewing operation can be performed, and therefore, the first transition section 422 is also an action section for adjusting the pitch of the pitch adjusting contour surface 42. When the thread trimming operation is performed, the needle pitch adjusting ball 621 enters the first arc segment 423 from the first transition segment 422, when the needle pitch adjusting ball 621 is located in the first arc segment 423, the needle pitch adjusting ball 621 moves along the first arc segment 423, the position of the needle pitch adjusting ball is kept unchanged, the needle pitch adjusting driving crank 62 executes an idle stroke, the needle pitch adjusting mechanism does not operate, and the needle pitch is kept to be 0.
In a specific embodiment, the needle pitch adjusting section 421 is formed by connecting an arc with a radius of 252.31mm and an arc with a radius of 9.46mm, wherein the arc with a radius of 252.31mm gradually transitions from a maximum value + N to a 0 needle pitch, the arc with a radius of 9.46mm gradually transitions from a 0 needle pitch to a minimum value-N, and the arc with a radius of 9.46mm has a chord length of 9.62 mm. The first transition section 422 is formed by connecting an arc with a radius of 9.46mm and a straight line with a length of 6.51 mm. The first arc segment 423 has a radius of 16.8 mm. The second transition section 424 is formed by connecting an arc with a radius of 9.96mm and a straight line with a length of 6.06 mm. The second circular arc segment 425 has a radius of 14.9 mm.
In this embodiment, the matching relationship between the trimming contour surface 41 and the pitch contour surface 42, i.e. the relative position design between the two, should satisfy: when the stitch length adjusting section 421 or the first transition section 422 of the stitch length adjusting contour surface 42 acts on the stitch length adjusting ball 621, the stitch length adjusting base circle section 411 of the stitch length adjusting contour surface 41 acts on the stitch length adjusting ball 521, at this time, the stitch length adjusting section 421 or the first transition section 422 can drive the stitch length adjusting driving crank 62 to swing, so as to drive the stitch length adjusting mechanism to execute the stitch length adjusting action, so as to obtain the required stitch length, meanwhile, the stitch length adjusting ball 521 is located on the stitch length adjusting base circle section 411 of the stitch length adjusting contour surface 41, the stitch length driving crank 52 executes the idle stroke, and the stitch length adjusting mechanism does not operate; when the trimming segment 412 of the trimming contour surface 41 acts on the trimming ball 521, the first arc segment 423 of the needle pitch adjusting contour surface 42 acts on the needle pitch adjusting ball 621, at this time, the trimming driving crank 52 is driven by the trimming segment 412 to swing, so as to drive the trimming mechanism to perform a trimming operation, and meanwhile, the needle pitch adjusting ball 621 is located in the first arc segment 423, the needle pitch adjusting driving crank 62 performs an idle stroke, and the needle pitch adjusting mechanism does not operate. Therefore, the purpose that the thread cutting action and the needle pitch adjusting action do not interfere with each other is achieved.
The working principle of the thread trimming and stitch length adjusting device of the sewing machine of the embodiment is as follows:
when the stitch length needs to be adjusted after sewing is finished before sewing is started, a stitch length adjusting signal can be input from a control panel of the sewing machine, the controller transmits the stitch length adjusting signal to the power part 3, the controller controls the rotating shaft of the power part 3 to rotate according to the stitch length adjusting signal to drive the cam 4 to rotate, so that the stitch length adjusting ball 621 moves along the stitch length adjusting section 421 of the stitch length adjusting contour surface 42 to drive the stitch length adjusting driving crank 62 and the stitch length adjusting mechanism to execute a stitch length adjusting action, and when the stitch length is adjusted to a required initial stitch length value within a (-N, + N) stitch length range, namely when the parameter requirement of the stitch length adjusting signal is met, the controller controls the rotating shaft of the power part 3 to stop rotating, so that the stitch length adjustment is finished. 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 performs an idle stroke, and the trimming mechanism does not operate.
When the thread cutting is needed after the sewing is finished, the rotating shaft of the power part 3 can be controlled by the controller to rotate anticlockwise, and the cam 4 is driven to rotate anticlockwise. Herein, the rotating direction of the rotating shaft of the power member 3 is based on the front view of the head of the sewing machine. In the rotation process, the needle pitch adjusting ball 621 firstly passes through the end of the needle pitch adjusting section 421 and the first transition section 422, and reaches the end of the first transition section 422, at this time, the needle pitch is transited from the initial needle pitch value to 0 (which may be approximately +0.5mm), and an encryption seam (such as an encryption 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 contour surface 41, the trimming driving crank 52 performs an idle stroke, and the trimming mechanism does not act. After the encryption seam is finished, the controller controls the rotating shaft of the power part 3 to continuously rotate anticlockwise to drive the cam 4 to continuously rotate anticlockwise, so that the thread cutting ball 521 enters the thread cutting segment 412 from the thread cutting base circle segment 411, the thread cutting driving crank 52 and the thread cutting mechanism start to perform thread cutting action until the thread cutting ball 521 reaches the tail end of the thread cutting segment 412, and the thread cutting action is finished. During the thread trimming process, the needle pitch adjusting ball 621 moves in the first arc segment 423, the needle pitch adjusting driving crank 62 executes an idle stroke, the needle pitch adjusting mechanism does not act, and the needle pitch is kept at 0.
After the thread trimming operation is completed, the controller controls the rotating shaft of the power part 3 to rotate clockwise in the opposite direction to drive the cam to rotate clockwise in the opposite direction, so that the needle pitch adjusting ball 621 returns to the position of the needle pitch adjusting section 421 corresponding to the required needle pitch value, meanwhile, the thread trimming ball 521 moves in the opposite direction along the thread trimming contour surface 41, returns to the thread trimming base circle section 411 from the thread trimming section 412, and drives the thread trimming driving crank 52 and the thread trimming mechanism to reset. When the needle pitch is adjusted to the required needle pitch value, the controller controls the rotating shaft of the power part 3 to stop rotating, and the sewing can be continued.
Or after the thread trimming operation is completed, the controller may control the rotating shaft of the power element 3 to rotate counterclockwise continuously, so as to drive the cam 4 to rotate counterclockwise continuously, so that the thread trimming ball 521 crosses the end of the thread trimming segment 412 and the concave segment 413 to reach the thread trimming base circle segment 411, and at the same time, the thread trimming driving crank 52 and the thread trimming mechanism are reset in reverse operation under the action of the return spring of the thread trimming mechanism. At this time, along with the rotation of the cam 4, the pitch adjusting ball 621 may enter the second transition section 424 from the first arc section 423, then enter the second arc section 425, and finally return to the position where the pitch adjusting section 421 corresponds to the required pitch value. When the needle pitch is adjusted to the required needle pitch value, the controller controls the rotating shaft of the power part 3 to stop rotating, and the sewing can be continued.
Based on above-mentioned sewing machine trimming needle roll adjustment device, this embodiment still provides a sewing machine, and the sewing machine of this embodiment includes the above-mentioned sewing machine trimming needle roll adjustment device of this embodiment.
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 (7)
1. The utility model provides a sewing machine thread trimming needle pitch adjusting device which characterized in that includes:
a power member (3);
the cam (4) is provided with a trimming profile surface (41) and a needle pitch adjusting profile surface (42), and the power part (3) is connected with the cam (4) and drives the cam (4) to rotate;
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 cam (4);
the needle pitch adjusting driving crank (62) is connected with the needle pitch adjusting mechanism, a needle pitch adjusting ball (621) is arranged on the needle pitch adjusting driving crank (62), and the needle pitch adjusting ball (621) is matched with the needle pitch adjusting contour surface (42) of the cam (4); the power part (3) drives the cam (4) to rotate, and the corresponding thread cutting mechanism or the corresponding needle pitch adjusting mechanism is driven to move through the angle matching of the thread cutting profile surface (41) on the cam (4) and the needle pitch adjusting profile surface (42) to execute thread cutting action or needle pitch adjusting action.
2. The trimming and stitch-length adjusting device of sewing machine according to claim 1, wherein the trimming profile surface (41) and the stitch-length adjusting profile surface (42) are respectively located on both sides of the cam (4).
3. The thread trimming and stitch length adjusting device of a sewing machine according to claim 1, wherein the thread trimming mechanism comprises a thread trimming driving shaft (51), the thread trimming driving shaft (51) is rotatably supported on the base plate (1) of the sewing machine, the thread trimming driving crank (52) is fixedly arranged on the thread trimming driving shaft (51), and the thread trimming driving shaft (51) is connected with the thread trimming assembly.
4. The thread trimming and stitch length adjusting device of a sewing machine according to claim 3, wherein the thread trimming mechanism further comprises a thread trimming front crank (53), a thread trimming crank connecting rod (54), a thread trimming rear crank (55) and a thread trimming crank shaft (56), the thread trimming crank shaft (56) is rotatably supported on the base plate (1) and is parallel to the thread trimming driving shaft (51); one end of the trimming front crank (53) is fixedly arranged on the trimming driving shaft (51), the other end of the trimming front crank is hinged with one end of the trimming crank connecting rod (54), the other end of the trimming crank connecting rod (54) is hinged with one end of the trimming rear crank (55), the other end of the trimming rear crank (55) is fixedly arranged at one end of the trimming crank shaft (56), and the other end of the trimming crank shaft (56) is connected with the trimming component.
5. The thread trimming and needle pitch adjusting device of a sewing machine according to claim 1, wherein the needle pitch adjusting mechanism comprises a needle pitch driving shaft (61), a needle pitch adjusting crank (63), a needle pitch adjusting connecting rod (64) and a needle pitch adjusting swing plate seat (65), the needle pitch driving shaft (61) is rotatably supported on the bottom plate (1) of the sewing machine, the needle pitch driving crank (62) is fixedly arranged on the needle pitch driving shaft (61), one end of the needle pitch adjusting crank (63) is fixedly arranged on the needle pitch driving shaft (61), the other end of the needle pitch adjusting crank is hinged with one end of the needle pitch adjusting connecting rod (64), the other end of the needle pitch adjusting connecting rod (64) is hinged with the needle pitch adjusting swing plate seat (65), and the needle pitch adjusting swing plate seat (65) is connected with a needle pitch adjusting component.
6. The thread trimming and stitch length adjusting device of a sewing machine according to claim 1, wherein the power member (3) is a stepping motor or a servo motor.
7. A sewing machine characterized by comprising the thread trimming and stitch length adjusting device of the sewing machine according to any one of claims 1 to 6.
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| CN201910097835.6A CN111501222B (en) | 2019-01-31 | 2019-01-31 | Thread trimming and stitch length adjusting device of sewing machine and sewing machine |
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| CN201910097835.6A CN111501222B (en) | 2019-01-31 | 2019-01-31 | Thread trimming and stitch length adjusting device of sewing machine and sewing machine |
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| CN111501222B true CN111501222B (en) | 2021-12-21 |
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| EP0417120A1 (en) * | 1988-06-04 | 1991-03-20 | G.M. Pfaff Aktiengesellschaft | Sewing machine with a lower feed dog |
| CN101392436A (en) * | 2002-05-14 | 2009-03-25 | 重机公司 | Sewing machine |
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| CN111501222A (en) | 2020-08-07 |
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