Synchronous control device of sewing machine

Abstract

The utility model provides a synchronous control device of a sewing machine, and belongs to the technical field of sewing machines. The problem of how to realize timely resetting of the presser foot and the feed dog on the premise of limited space is solved. The synchronous control device of the sewing machine comprises a driving motor, a presser foot lifting adjusting mechanism with a presser foot lifting adjusting piece and a stitch length adjusting mechanism with a stitch length adjusting piece, a presser foot lifting adjusting cam is fixed to a motor shaft of the driving motor, and the outer side wall of the presser foot lifting adjusting piece abuts against the presser foot lifting adjusting cam. A connecting disc is further fixed to a motor shaft of the driving motor, an annular and eccentrically-arranged limiting groove is formed in the plate face of one side of the connecting disc in the circumferential direction, and the needle pitch adjusting piece is embedded and limited in the limiting groove. The synchronous control device of the sewing machine further comprises a presser foot lifting reset assembly capable of enabling the presser foot lifting adjusting piece to abut against the presser foot lifting adjusting cam all the time. The synchronous control device of the sewing machine can realize timely resetting of the presser foot and the feed dog on the premise of limited space.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a synchronous control device of a sewing machine. Background Art

[0002] Sewing machines are clothing sewing devices that are widely used in today's life. In recent years, with the continuous improvement of technical levels, the functions of sewing machines have become more and more diverse. For example, a stitch length adjustment and automatic presser foot lifting device disclosed in a Chinese patent (authorization announcement number: CN217628851U) is provided, wherein a stitch length adjustment cam and a presser foot lifting adjustment cam are arranged on the motor shaft of the driving motor, one end of the feed control crank is connected to the control rotating shaft, and the other end is connected to the stitch length adjustment mechanism, one end of the presser foot lifting control crank is connected to the control rotating shaft, and the other end is connected to the presser foot lifting mechanism, a stitch length adjustment rolling member is arranged on the feed control crank, and a presser foot lifting rolling member is arranged on the presser foot lifting control crank, the cam surface of the stitch length adjustment cam includes a stitch length adjustment section, a presser foot lifting idling section and a first transition section, and the cam surface of the presser foot lifting cam includes a presser foot lifting section, a stitch length adjustment idling section and a second transition section; when the stitch length is adjusted and the presser foot is lifted, the presser foot lifting mechanism and the stitch length adjustment mechanism do not interfere with each other.

[0003] Combined with the contents of paragraphs 0036 and 0039 of the description of the comparative document, it can be known that for the presser foot lifting action and stitch length adjustment action in the sewing machine, the motor shaft of the driving motor drives the stitch length adjustment cam and the presser foot lifting cam to rotate together, and the stitch length adjustment cam drives the stitch length adjustment roller to drive the feed dog in the stitch length adjustment mechanism to move the fabric, and the presser foot lifting cam drives the presser foot lifting roller to drive the presser foot lifting mechanism to move the presser foot to flatten the fabric.

[0004] In actual use, since both the stitch length adjustment cam and the presser foot lifting cam are special-shaped wheels, when they rotate with the motor shaft, they push the stitch length adjustment roller and the presser foot lifting roller respectively, and there may be separation between the stitch length adjustment cam and the stitch length adjustment roller, and between the presser foot lifting cam and the presser foot lifting roller. In other words, there may be a situation where the presser foot and the feed dog cannot be moved and reset. To address this defect, the comparative document provides a solution in paragraphs 0037-0038 of the specification, namely, a fixed base plate is provided in the shell, and the base plate and the swing seat reset pin are connected by a tension spring, so that the elastic force of the tension spring can realize the separation of the stitch length adjustment cam and the stitch length adjustment roller, and then pull the stitch length adjustment roller to move and abut against the stitch length adjustment cam again. Similarly, this structure is also used for the presser foot lifting cam and the presser foot lifting roller.

[0005] However, as is known to all, as a high-precision device, a sewing machine has a large number of transmission components integrated inside its casing, which results in that the installation space available inside is not so abundant, which may cause the above-mentioned reset structure to be unable to be effectively installed. Summary of the invention

[0006] The utility model aims at the above problems existing in the prior art and proposes a synchronous control device for a sewing machine. The technical problem to be solved by the utility model is: how to realize the timely resetting of the presser foot and the feed dog under the premise of limited space.

[0007] The purpose of the utility model can be achieved through the following technical solutions: a synchronous control device of a sewing machine, comprising a driving motor, a presser foot lifting and adjusting mechanism with a presser foot lifting and adjusting member, and a stitch length adjusting mechanism with a stitch length adjusting member, a presser foot lifting and adjusting cam being fixed on the motor shaft of the driving motor, and the outer side wall of the presser foot lifting and adjusting member abuts against the presser foot lifting and adjusting cam, and is characterized in that a connecting disk is also fixed on the motor shaft of the driving motor, and a ring-shaped and eccentrically arranged limiting groove is opened on the upper circumferential edge of one side plate surface of the connecting disk, and the stitch length adjusting member is embedded in and limited in the limiting groove, and the synchronous control device of the sewing machine also includes a presser foot lifting and resetting assembly that can make the presser foot lifting and adjusting member always abut against the presser foot lifting and adjusting cam.

[0008] The synchronous control device of the sewing machine comprises a driving motor, a presser foot lifting and adjusting mechanism for controlling the lifting of the presser foot, a stitch length adjusting mechanism for controlling the feed dog to protrude from the needle plate, and a reverse and forward sewing driving mechanism for controlling the feed dog to move in different paths and protrude from the needle plate. A presser foot lifting and adjusting cam and a connecting plate arranged at intervals along the length direction of the motor shaft are fixed on the motor shaft of the driving motor. The presser foot lifting and adjusting cam abuts against the presser foot lifting and adjusting member in the presser foot lifting and adjusting mechanism. During the rotation of the motor shaft, the presser foot lifting and adjusting cam is driven to rotate, and the presser foot lifting and adjusting member is pushed by the irregular surface of its outer wall to drive the presser foot lifting and adjusting mechanism to move upward, and finally realize the lifting action of the presser foot. Based on the above structure, compared with the prior art, the advantage of this case is that after the presser foot is lifted upward by the presser foot lifting and adjusting mechanism, the presser foot lifting and adjusting cam will separate from the presser foot lifting and adjusting member during the continuous rotation, thereby causing the presser foot to be unable to fall and reset. The present application controls the presser foot lifting and adjusting mechanism through a presser foot reset assembly fixed on the frame, so as to achieve the momentary pulling The presser foot lifting and adjusting mechanism is moved so that the presser foot lifting and adjusting member always abuts against the outer wall of the presser foot lifting and adjusting cam, thereby realizing the lifting and resetting of the presser foot during the rotation of the presser foot lifting and adjusting cam, and at the same time, a connecting disk that can rotate synchronously with the driving end of the driving motor is installed on the driving end of the driving motor, and a ring-shaped and eccentrically arranged limiting groove is provided on one side plate of the connecting disk, and the stitch length adjusting member is embedded in the limiting groove, and in the process that the connecting disk rotates with the motor shaft, the groove wall of the limiting groove can effectively limit the stitch length adjusting member, so that the stitch length adjusting member can drive the stitch length adjusting mechanism to move with the rotation of the connecting disk, thereby directly realizing the lifting and resetting of the feed dog during the rotation of the connecting disk. In addition, compared with the prior art, the above-mentioned setting method can, when the space in the sewing machine casing is limited, replace at least one group of resetting structures while the connecting disk pushes the feed dog, thereby alleviating the installation pressure of the presser foot lifting and resetting assembly, so as to ensure that the presser foot is reset and the feed dog can be reset in time after being lifted early.

[0009] In the above-mentioned synchronous control device of the sewing machine, the connecting disk is in the shape of a plate and is fixed on the motor shaft of the driving motor. The limiting groove is provided along the circumferential direction near the edge of the plate surface of the connecting disk on one side facing away from the driving motor body, and a stitch length adjustment cam is formed on the plate surface of the connecting disk and in the limiting groove. Under the premise of ensuring the stable connection of the connecting disk, this arrangement is adopted to achieve that the connecting disk can directly integrate the stitch length adjustment cam, and at the same time, the stitch length adjustment cam is prevented from protruding too much from the connecting disk, thereby preventing the existence of the stitch length adjustment cam from affecting the installation of other components in the casing.

[0010] In the above-mentioned synchronous control device of the sewing machine, the stitch length adjustment mechanism includes a stitch length adjustment crank, the stitch length adjustment member is in the shape of a rod, one end of the stitch length adjustment member is fixedly connected to the stitch length adjustment crank, and the other end is sleeved with an annular roller, and the outer side wall of the roller abuts against the outer side wall of the stitch length adjustment cam and the inner side wall of the limit groove respectively. The annular roller abuts against the outer side wall of the stitch length adjustment cam and the inner side wall of the limit groove respectively, thereby effectively avoiding excessive wear of the stitch length adjustment member, and the stitch length adjustment member can specifically be a threaded pin or a bolt, etc.

[0011] In the above-mentioned synchronous control device of the sewing machine, the connecting disk has a protruding portion on one side plate surface facing the main body of the driving motor, the connecting disk is provided with a socket hole passing through the protruding portion and allowing the motor shaft to pass through, the outer side wall of the protruding portion is provided with a plurality of locking holes connected to the socket hole along the circumferential direction, and the connecting disk is positioned by screws passing through the locking holes and pressing against the motor shaft. The connecting disk is specifically sleeved on the outside of the motor shaft of the driving motor through the socket hole, and is screwed in the locking hole by screws to press against the outer wall of the motor shaft of the driving motor, thereby ensuring the installation stability of the connecting disk.

[0012] In the above-mentioned synchronous control device of the sewing machine, the presser foot lifting adjustment mechanism includes a presser foot lifting short connecting rod, the presser foot lifting adjustment member is a ball bearing, the inner ring of the presser foot lifting adjustment member is fixedly connected to the presser foot lifting short connecting rod through a screw and a nut, and the outer ring of the presser foot lifting adjustment member is in abutment with the presser foot lifting adjustment cam. The presser foot lifting adjustment mechanism is connected to the presser foot lifting adjustment member through a short connecting rod, and as a specific solution, the presser foot lifting adjustment member is specifically a ball bearing, that is, its inner ring can be fixed to the presser foot lifting short connecting rod by a screw, and its outer ring can roll when it contacts and is subjected to force with the presser foot lifting adjustment cam, thereby reducing the wear on the presser foot lifting adjustment member and the presser foot lifting adjustment cam. In addition, as an alternative solution, the presser foot lifting adjustment member can also have a rotating disk on the outer wall, which is screwed to the presser foot lifting short connecting rod by a screw and can rotate circumferentially around the screw.

[0013] In the above-mentioned synchronous control device of the sewing machine, the presser foot lifter reset assembly includes a tension spring and a spring pin for fixing in the frame, the presser foot lifter adjustment mechanism also includes a presser foot lifter plate fixedly connected to the presser foot lifter short connecting rod and a rear lever hinged to the presser foot lifter plate, one end of the tension spring is connected to the spring pin, and the other end is connected to the rear lever. As a further solution, the presser foot lifter and reset assembly in the present application is also different from the reset structure in the prior art. Specifically, the presser foot lifter and reset assembly includes a spring pin and a tension spring, wherein the spring pin is fixed on the frame of the sewing machine, one end of the tension spring is connected to the rear lever in the presser foot lifter and adjusting mechanism, and the other end is connected to the spring pin. After the connection is completed, the spring is always in a tensioned state. After the presser foot lifter and adjusting mechanism lifts the presser foot, when the elastic force acting on the rear lever is greater than other forces, the rear lever and even the entire presser foot lifter and adjusting mechanism can be pulled downward to reset, thereby realizing the movement and reset of the presser foot. In addition, compared with the prior art, the original base plate structure is replaced by the setting of a spring pin, which can effectively reduce the installation space required for the presser foot lifter and reset assembly, thereby avoiding affecting the installation of other components. As an alternative solution, the tension spring in the presser foot lifter and reset assembly can be replaced by an elastic metal sheet.

[0014] Compared with the prior art, the synchronous control device of the sewing machine has the following advantages:

[0015] By opening an annular and eccentrically arranged limiting groove on the connecting disk, a stitch length adjustment cam is formed on the side plate surface of the connecting disk in the limiting groove, so that the stitch length adjustment member is embedded in and limited in the limiting groove. During operation, due to the existence of the limiting groove, the stitch length adjustment member is always in contact with the outer wall of the stitch length adjustment cam, thereby achieving the function of lifting the feed dog and driving it to reset at the same time. At the same time, the presser foot lifting and resetting assembly cooperates with the presser foot lifting and adjusting cam and the presser foot lifting and adjusting member to achieve the lifting and resetting of the presser foot. Compared with the prior art, on the premise of ensuring that the feed dog and the presser foot can be reset, at least one set of reset structures is omitted, thereby alleviating the problem of insufficient installation space inside the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the synchronous control device of the sewing machine.

[0017] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0018] Figure 3 It is a structural schematic diagram of the synchronous control device of the sewing machine from another perspective.

[0019] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0020] Figure 5 It is a structural diagram of the connection disk.

[0021] Figure 6 It is a structural diagram of the connection disk from another perspective.

[0022] Figure 7 It is a structural schematic diagram of the needle distance adjustment part.

[0023] Figure 8 It is a structural schematic diagram of the presser foot lifting and resetting assembly.

[0024] In the figure,

[0025] 1. driving motor; 11. presser foot lifting adjustment cam; 12. connecting plate; 121. stitch length adjustment cam; 122. limit groove; 123. protrusion; 1231. locking hole; 124. socket hole;

[0026] 2. Presser foot lifting adjustment mechanism; 21. Presser foot lifting adjustment member; 22. Presser foot lifting short connecting rod; 23. Presser foot lifting plate; 24. Rear lever;

[0027] 3. Needle distance adjustment mechanism; 31. Needle distance adjustment member; 311. Roller; 32. Needle distance adjustment crank;

[0028] 4. Reverse and forward sewing driving mechanism;

[0029] 5. Presser foot lifting and resetting assembly; 51. Tension spring; 52. Spring pin. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] like Figure 1 and Figure 3 As shown, the synchronous control device of the sewing machine comprises a driving motor 1, a presser foot lifting adjustment mechanism 2 connected to the presser foot of the sewing machine, a stitch length adjustment mechanism 3 connected to the feed dog of the sewing machine, and a reverse and forward sewing driving mechanism 4 respectively connected to the stitch length adjustment mechanism and the feed dog. Figure 2 and Figure 4 The motor shaft of the driving motor 1 is provided with intervals along the length direction of the motor shaft and the presser foot lifting and adjusting cam 11 and the connecting plate 12 which can rotate synchronously with the motor shaft, combined with Figure 5-6The connecting disk 12 is specifically arranged vertically, with one side thereof facing the main body of the driving motor 1, and the side of the connecting disk 12 facing the main body of the driving motor 1 has a protruding protrusion 123, and a sleeve hole 124 is provided near the center of the connecting disk 12, and the connecting disk 12 is sleeved with the outside of the motor shaft through the sleeve hole 124. A plurality of locking holes 1231 arranged at intervals and connected to the sleeve hole 124 are provided on the outer wall of the protrusion 123 along the circumferential direction, and a plurality of screws are screwed into the locking holes 1231 one by one and pressed against the outside of the motor shaft, thereby firmly positioning the connecting disk 12 on the motor shaft, and an annular limiting groove 122 is provided on the disk surface of the other side of the connecting disk 12 near the edge along the circumferential direction, and a stitch distance adjustment cam 121 located in the limiting groove 122 is formed on the disk surface of the connecting disk 12 on this side.

[0032] The presser foot lifting and adjusting mechanism 2, the needle length adjusting mechanism 3 and the reverse and forward sewing driving mechanism 4 are all prior arts, among which the specific structures of the presser foot lifting and adjusting mechanism 2 and the needle length adjusting mechanism 3 are disclosed in paragraphs 0036 and 0039 of the specification of Chinese patent CN217628851U, and the working principles are disclosed in paragraphs 0042 to 0045 of the specification. The specific structure and working principle of the reverse and forward sewing driving mechanism 4 are disclosed in paragraphs 0026 and 0035 of Chinese patent CN109056197A. Therefore, the specific structures and working principles of the presser foot lifting and adjusting mechanism 2, the needle length adjusting mechanism 3 and the reverse and forward sewing driving mechanism 4 are not elaborated in this case.

[0033] However, it is worth mentioning that the presser foot lifting and adjusting mechanism 2 specifically includes a presser foot lifting short connecting rod 22 and a presser foot lifting plate 23 which are screwed and locked together by a bolt and a nut. A presser foot lifting and adjusting member 21 is rotatably connected to the presser foot lifting and short connecting rod 22, specifically a roller 311 bearing. As an alternative, it can also be a rotating disk rotatably connected to the presser foot lifting and short connecting rod 22, and the presser foot lifting and adjusting member 21 abuts against the outer side wall of the presser foot lifting and adjusting cam 11. The stitch length adjustment mechanism 3 specifically includes a stitch length adjustment crank 32 hinged in the sewing machine casing, combined with Figure 7 A stitch length adjusting member 31 is installed on the stitch length adjusting crank 32, which is specifically a bolt. The stitch length adjusting member 31 is screwed to position one end of itself on the stitch length adjusting crank 32, and the other end is embedded in the limiting groove 122. The end of the stitch length adjusting member 31 embedded in the limiting groove 122 is sleeved with a roller 311 whose outer wall is respectively in contact with the stitch length adjusting cam 121 and the inner wall of the limiting groove 122. As an alternative, the stitch length adjusting member 31 can also be a bolt fixed with a ball bearing.

[0034] In addition, the presser foot lifting and adjusting mechanism 2 further comprises a rear lever 24 hinged to the presser foot lifting plate 23, and a hanging hole is provided on the rear lever 24. Figure 8The synchronous control device of the sewing machine also includes a presser foot lifting and resetting component 5, which specifically includes a tension spring 51 and a spring pin 52. One end of the spring pin 52 is fixed in a reserved hole opened on the frame, and a hanging groove is opened on the outer wall of the other end along the circumferential direction. One end of the tension spring 51 is hung in the hanging hole, and the other end is hung in the hanging groove.

[0035] Working principle: The present application drives the motor 1 shaft to rotate by driving the motor 1, thereby realizing the synchronous rotation of the connecting disk 12 and the presser foot lifting adjustment cam 11, and the connecting disk 12 rotates and causes the stitch adjustment cam 121 to push the stitch adjustment member 31 to move, thereby realizing the movement of the entire stitch adjustment mechanism 3 and driving the reverse and forward sewing driving mechanism 4 to work, thereby realizing the stitch adjustment and the switching of forward sewing or reverse sewing, and in this process, due to the limitation of the stitch adjustment member 31 by the limiting groove 122, the limiting adjustment member always abuts against the stitch adjustment cam 1 The outer wall of 21 is formed on the feed dog, thereby achieving the ejection and reset action along with the stitch length adjustment cam 121. At the same time, the presser foot lifting adjustment mechanism 2 pushes the presser foot lifting adjustment member 21 to move, so that the presser foot lifting adjustment mechanism 2 is driven, thereby driving the presser foot to move upward. At the same time, under the action of the tension spring 51, the presser foot lifting adjustment member 21 is always in contact with the presser foot lifting adjustment cam 11, thereby ensuring that when the force of the presser foot lifting adjustment cam 11 on the presser foot lifting adjustment member 21 disappears, the presser foot can be moved downward and reset by the tension of the tension spring 51.

[0036] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0037] Although the present invention uses more terms such as driving motor 1, presser foot lifting adjustment cam 11, connecting plate 12, stitch length adjustment cam 121, limiting groove 122, protrusion 123, locking hole 1231, sleeve hole 124, presser foot lifting adjustment mechanism 2, presser foot lifting adjustment member 21, presser foot lifting short connecting rod 22, presser foot lifting plate 23, rear lever 24, stitch length adjustment mechanism 3, stitch length adjustment member 31, roller 311, stitch length adjustment crank 32, reverse and forward sewing driving mechanism 4, presser foot lifting reset assembly 5, tension spring 51, spring pin 52, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A synchronous control device for a sewing machine, comprising a driving motor (1), a presser foot lifting and adjusting mechanism having a presser foot lifting and adjusting member (21), and a stitch length adjusting mechanism (3) having a stitch length adjusting member (31), wherein a presser foot lifting and adjusting cam (11) is fixed to the motor shaft of the driving motor (1), and an outer side wall of the presser foot lifting and adjusting member (21) abuts against the presser foot lifting and adjusting cam (11), characterized in that: A connecting disk (12) is also fixed on the motor shaft of the driving motor (1), and a limiting groove (122) in an annular shape and eccentrically arranged is provided on a side plate surface of the connecting disk (12) in the circumferential direction, and the stitch length adjusting member (31) is embedded in and limited in the limiting groove (122). The synchronous control device of the sewing machine also includes a presser foot lifting reset assembly (5) capable of making the presser foot lifting adjusting member (21) always abut against the presser foot lifting adjusting cam (11).

2. The synchronous control device for a sewing machine according to claim 1, characterized in that: The connecting disk (12) is plate-shaped and fixed on the motor shaft of the driving motor (1); a limiting groove (122) is provided along the circumferential direction near the edge of a plate surface on one side of the connecting disk (12) facing away from the main body of the driving motor (1); a needle distance adjustment cam (121) is formed on the plate surface of the side of the connecting disk (12) and located in the limiting groove (122).

3. The synchronous control device for a sewing machine according to claim 2, characterized in that: The stitch length adjustment mechanism (3) comprises a stitch length adjustment crank (32); the stitch length adjustment member (31) is in the shape of a rod; one end of the stitch length adjustment member (31) is fixedly connected to the stitch length adjustment crank (32); the other end of the stitch length adjustment member (31) is sleeved with a ring-shaped roller (311); the outer side wall of the roller (311) respectively abuts against the outer side wall of the stitch length adjustment cam (121) and the inner side wall of the limiting groove (122).

4. The synchronous control device for a sewing machine according to claim 2, characterized in that: The connecting disk (12) has a protruding portion (123) on a side plate surface facing the main body of the driving motor (1); the connecting disk (12) is provided with a socket hole (124) passing through the protruding portion (123) and allowing the motor shaft to pass through; a plurality of locking holes (1231) communicating with the socket hole (124) are circumferentially provided on the outer side wall of the protruding portion (123); the connecting disk (12) is positioned by screws passing through the locking holes (1231) and pressed against the motor shaft.

5. The synchronous control device for a sewing machine according to claim 1, 2 or 4, characterized in that: The presser foot lifting and adjusting mechanism (2) comprises a presser foot lifting short connecting rod (22); the presser foot lifting and adjusting member (21) is a ball bearing; the inner ring of the presser foot lifting and adjusting member (21) is fixedly connected to the presser foot lifting short connecting rod (22) via a screw and a nut, and the outer ring of the presser foot lifting and adjusting member (21) abuts against the presser foot lifting and adjusting cam (11).

6. The synchronous control device for a sewing machine according to claim 5, characterized in that: The presser foot lifting and resetting assembly (5) comprises a tension spring (51) and a spring pin (52) for fixing in a frame, the presser foot lifting and adjusting mechanism (2) further comprises a presser foot lifting plate (23) fixedly connected to the presser foot lifting short connecting rod (22) and a rear lever (24) hinged to the presser foot lifting plate (23), one end of the tension spring (51) is connected to the spring pin (52), and the other end is connected to the rear lever (24).

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