A trimming device for sewing machine and sewing machine

Abstract

The purpose of the present invention is to provide a trimming device for a sewing machine which is simple to operate, more accurate, easy to install, and separated from the transmission of other mechanisms; it includes a bearing seat, and a driving motor and a trimming assembly arranged inside the bearing seat; the driving motor transmits power to the edge starting assembly through a crank connecting rod assembly; cooperates with a knife holder guide frame and a slider arranged in its vertical slide groove to drive the trimming assembly to rise and fall vertically; the trimming assembly is provided with a knife rod and a knife holder; the knife holder includes a fixed bracket and an adjusting bracket; a cutter is installed at the lower part of the adjusting bracket; a plurality of adjusting threaded holes are opened on the adjusting bracket, and the height of the cutter can be adjusted by adjusting the threaded holes; the bearing seat can be installed on the sewing machine casing; the driving motor is arranged horizontally, and the motor shaft is parallel to the sewing machine main shaft; a cover is provided on the bearing seat, and the cover is used to protect the driving motor; the cover bearing seat and the sewing machine casing are connected by bolts.

Description

Technical Field

[0001] The invention relates to the field of sewing machines, in particular to a trimming device of a sewing machine. Background Art

[0002] Patent No. CN201020525945.2 discloses a synchronous vertical trimming integrated feed sewing machine, which connects the cutter bar cam and the needle bar crank on the same main shaft, so that the cutter action maintains the same frequency as the thread picking action and the presser foot action to move vertically up and down.

[0003] This technical solution has the following disadvantages:

[0004] 1. The cutter assembly will perform edge trimming when driven by the spindle. When the fabric needs to be turned, the spindle stops rotating, causing the presser foot to lift, and the fabric cannot be trimmed at this time.

[0005] 2. The knife bar cam and the needle bar crank are connected to the same main shaft and are positioned and connected by pins. The synchronization between the cutting action, the thread picking action and the presser foot action is achieved through the action between the machines. This method easily interferes with the edge cutting action and is not precise and stable enough.

[0006] 3. The cutter assembly uses two cutter guide frames to adjust the position of the cutter on the horizontal plane, which is not only complicated to adjust but also difficult to ensure accuracy.

[0007] 4. The cutter assembly is manually controlled by a knife control rod and a clutch knob, which makes the operation inconvenient. At the same time, additional components are added, making the internal structure of the sewing machine too compact, causing inconvenience for the maintenance and upgrade of the sewing machine. Summary of the invention

[0008] The purpose of the present invention is to provide a trimming device for a sewing machine which is simple to operate, more accurate, easy to install, and separated from the transmission of other mechanisms.

[0009] The purpose of the invention is achieved in this way:

[0010] A trimming device for a sewing machine, comprising

[0011] A bearing seat, which is arranged on the sewing machine body;

[0012] A driving motor is mounted on the bearing seat and is used to provide power;

[0013] The cutter assembly is arranged on the bearing seat and can be lifted and lowered vertically;

[0014] The crank-connecting rod assembly is arranged in the bearing seat, one end of which is a power input end and the other end is a power output end; the power input end is connected to the motor shaft of the driving motor, and the power output end is connected to the cutter assembly;

[0015] The knife holder guide frame is arranged in the bearing seat and has a vertical slide groove; the power output end is provided with a slider, the slider is located in the slide groove, and the slider is connected to the guide column of the cutter assembly; the crank connecting rod assembly converts the rotation of the motor shaft into the vertical lifting of the cutter assembly.

[0016] Preferably, the crank-connecting rod assembly includes a crank sleeve, a connecting rod and a guide column; the crank sleeve is passed through the motor shaft, the swing end of the crank sleeve is hinged to the upper end of the connecting rod, the lower end of the connecting rod is sleeved on the guide column, one end of the guide column is fixedly connected to the upper end of the cutter assembly, and the other end of the guide column is connected to the slider.

[0017] Preferably, the cutter assembly is provided with a cutter bar and a cutter holder; the cutter holder comprises a fixed bracket and an adjusting bracket; the fixed bracket is mounted on the lower end of the cutter bar, the top end of the adjusting bracket is formed with a groove adapted to the fixed bracket, and the adjusting bracket is assembled on the fixed bracket through the groove;

[0018] The surface of the adjusting bracket is provided with an adjusting groove, and a bolt passes through the adjusting groove to screw the fixing bracket and the adjusting bracket into one body;

[0019] A cutter is installed at the lower part of the adjusting bracket.

[0020] Preferably, a U-shaped groove is formed at the top of the cutter, a plurality of adjusting threaded holes are opened on the adjusting bracket, an adjusting bolt passes through the U-shaped groove and is assembled into the adjusting threaded hole, and a gasket is provided between the adjusting bolt and the U-shaped groove;

[0021] The adjusting bolt is used to realize the screw connection between the cutter, the gasket and the adjusting bracket, and the cutter is fixed on the adjusting bracket, so that the cutter can move together with the cutter assembly.

[0022] Preferably, the width of the fixed bracket is smaller than the distance between the needle bar and the presser foot lifting rod, so that the fixed bracket extends from between the needle bar and the presser foot lifting rod.

[0023] Preferably, the cutter abuts against the tungsten steel sheet on the inner side of the needle plate.

[0024] Preferably, the bearing seat is an end cover of a sewing machine;

[0025] The bearing seat is arranged on the casing of the sewing machine.

[0026] Preferably, the driving motor is arranged transversely, and the motor shaft is parallel to the main shaft of the sewing machine.

[0027] Preferably, a cover is provided on the bearing seat, and the cover is used to protect the driving motor; the bearing seat and the sewing machine casing are connected by bolts.

[0028] A sewing machine comprises the above-mentioned trimming device for the sewing machine.

[0029] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0030] 1. The trimming device is equipped with a separate drive motor, which no longer requires the motor drive of the sewing machine.

[0031] When the angle is set, the trimming device can still perform the trimming action.

[0032] 2. The trimming device can be sold separately. When assembling, you only need to screw the bearing base and the sewing machine housing together.

[0033] Bolt tighten, no additional mechanical connection structure, screw holes can use the original model hole position, independent control and installation

[0034] Convenient; it is also very suitable for old models and suitable for upgrading and modification.

[0035] 3. The drive motor and the sewing machine upper shaft motor are located at the two ends of the frame and are basically in the same straight line.

[0036] When the two motors work at the same time, they can achieve dynamic balancing and reduce sewing vibration to a certain extent.

[0037] Improve usage comfort.

[0038] 4. Due to the use of a separate drive motor, the trimming action is separated from other actions, reducing mechanical time

[0039] The controller sends signals to the two drive motors to achieve synchronization, which improves the working time of the sewing machine.

[0040] Accuracy and stability.

[0041] 5. The cutter assembly is fixed on the end cover and is limited by a cutter guide frame to fix the cutter in the front and rear directions.

[0042] The position of the cutter in the horizontal and vertical directions can be adjusted by adjusting the grooves and threaded holes on the bracket.

[0043] The precise positioning of the cutter also improves the flexibility of the cutter.

[0044] 6. By removing the trimming device from the sewing machine, not only the cutting device is simplified, but also the number of components is reduced.

[0045] The types and quantities make the internal space of the sewing machine no longer compact and easy to maintain.

[0046] 7. The trimming device is arranged inside the bearing seat, and the bearing seat can be connected to the sewing machine through bolts.

[0047] The controller is used to synchronize the trimming device drive motor and the sewing machine motor, and the original mechanism of the sewing machine can be retained.

[0048] Under such circumstances, product upgrade of sewing machines can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural diagram of the present invention.

[0050] Figure 2 It is a structural diagram of the cutter assembly of the present invention.

[0051] Figure 3 It is an exploded view of the present invention.

[0052] Figure 4 It is a structural diagram after the present invention and the sewing machine are assembled.

[0053] Figure 5 yes Figure 4 A is an enlarged view of the middle image.

[0054] Figure 6 It is a cross-sectional view after the present invention and the sewing machine are assembled.

[0055] Reference numerals: 1-bearing seat; 11-tool holder guide frame; 12-slideway; 13-slider; 14-cover; 15-sleeve; 16-mounting

[0056] Matching holes;

[0057] 2-cutter assembly; 20-cutter bar; 21-guide column; 22-cutter holder; 221-adjusting bracket; 222-fixing bracket; 23-groove;

[0058] 24-adjustment slot; 25-cutter; 26-U-shaped slot; 27-adjustment bolt; 28-gasket; 29-adjustment threaded hole;

[0059] 3-driving motor; 31-motor shaft; 32-crank connecting rod assembly; 33-crank sleeve; 34-connecting rod;

[0060] 4-sewing machine housing; 41-threading mechanism; 42-needle; 43-needle bar; 44-presser foot lifting mechanism; 45-presser foot; 46-lifting mechanism

[0061] Presser foot rod; 47-needle plate; 48-tungsten steel sheet;

[0062] 100-Sewing machine upper shaft motor. DETAILED DESCRIPTION

[0063] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings.

[0064] However, the present invention is not limited to these Examples.

[0065] like Figure 1-Figure 3 As shown, a trimming device for a sewing machine comprises

[0066] A bearing seat 1, which is arranged on the sewing machine body;

[0067] A driving motor 3 is mounted on the bearing base 1 and is used to provide power;

[0068] The cutter assembly 2 is arranged on the bearing seat 1 and can be lifted and lowered vertically;

[0069] The crank connecting rod assembly 32 is arranged in the bearing seat 1, one end of which is a power input end 35, and the other end is a power output end 36; the power input end 35 is connected to the motor shaft 31 of the driving motor 3, and the power output end 36 is connected to the cutter assembly 2;

[0070] The knife holder guide frame 11 is arranged in the bearing seat 1 and has a vertical slide groove 12; the power output end 36 is provided with a slider 13, the slider 13 is located in the slide groove 12, and the slider 13 is connected to the guide column 21 of the cutter assembly 2; the crank connecting rod assembly 32 converts the rotation of the motor shaft 31 into the vertical lifting of the cutter assembly 2.

[0071] The cutter assembly 2 is driven by the drive motor 3. When the drive motor 3 is started, the power input end 35 transmits energy to the cutter assembly 2 connected to the power output end 36 through the crank connecting rod assembly 32.

[0072] Since the knife holder guide frame 11 is vertically fixed on the bearing seat 1, the horizontal displacement of the slider 13 is limited by the slideway 12, so that the slider 13 can only reciprocate in the up and down direction. Since the slider 13 is connected to the guide column 12, when the guide column 21 is driven by the power output end 36 to move, the slider 13 also limits the horizontal displacement of the guide column 12, so that the rotation of the motor shaft 31 is converted into the vertical lifting of the cutter assembly 2, and the shaking of the cutter assembly 2 is reduced, and the accuracy of the cutter 25 is improved.

[0073] like Figure 1-Figure 3As shown, the crank-connecting rod assembly 32 includes a crank sleeve 33, a connecting rod 34 and a guide column 21; the crank sleeve 32 is passed through the motor shaft 31, the swing end of the crank sleeve 32 is hinged to the upper end of the connecting rod 33, the lower end of the connecting rod 33 is sleeved on the guide column 21, one end of the guide column 21 is fixedly connected to the upper end of the cutter assembly 2, and the other end of the guide column 21 is connected to the slider 13.

[0074] When the driving motor 3 is started, the crank sleeve 33 fixed on the motor shaft 31 by bolts also rotates with the motor shaft 31, and drives the guide column 21 to move through the connecting rod 33. Since one end of the guide column 21 is connected to the slider 13 located in the tool holder guide frame 11, the guide column 21 can only move along the direction of the tool holder guide frame 11.

[0075] The other end of the guide column 21 is connected to the cutter rod 20 of the cutter assembly 2. Therefore, when the guide column 21 is driven by the drive motor 3 and starts to move, it will drive the cutter rod 20 to move along the direction of the tool holder guide frame 11, thereby realizing the transmission of the power generated by the drive motor 3 to the cutter assembly 2.

[0076] like Figure 1-Figure 3 As shown, the cutter assembly 2 is provided with a knife bar 20 and a knife holder 22; the knife holder 22 includes a fixed bracket 221 and an adjusting bracket 222; the fixed bracket 222 is installed at the lower end of the knife bar 20, and the top end of the adjusting bracket 222 is formed with a groove 23 adapted to the fixed bracket 221, and the adjusting bracket 222 is assembled on the fixed bracket 221 through the groove 23;

[0077] The tool holder 22 is used to connect the tool rod 20 and the cutter 25. One end of the fixed bracket 221 is connected to the bottom end of the tool rod 20. The top of the adjusting bracket 222 is formed with a groove 23 adapted to the fixed bracket 222. The adjusting bracket 222 is assembled on the other end of the fixed bracket 221 through the groove 23.

[0078] An adjusting groove 24 is formed on the surface of the adjusting bracket 222 , and a bolt passes through the adjusting groove 24 to screw the fixing bracket 221 and the adjusting bracket 222 together; a cutter 25 is installed at the lower part of the adjusting bracket 222 .

[0079] During operation, the function of moving the adjustment bracket 222 can be realized by changing the position of the bolt passing through the adjustment slot 24, and then the position of the cutter 25 in the left-right direction can be adjusted.

[0080] like Figure 3-Figure 6 A U-shaped groove 26 is formed at the top of the cutter 25, and a plurality of adjusting threaded holes 29 are opened on the adjusting bracket 222. The adjusting bolt 27 passes through the U-shaped groove 26 and is assembled into the adjusting threaded hole 29. A gasket 28 is provided between the adjusting bolt 27 and the U-shaped groove 26.

[0081] The screw connection between the cutter 25 , the gasket 28 and the adjusting bracket 22 is achieved by adjusting the bolt 27 , and the cutter 25 is fixed on the adjusting bracket 22 , so that the cutter 25 can move together with the cutter assembly 2 .

[0082] After the adjusting bolt 27 is tightened, the U-shaped groove 26 formed at the top of the cutter 25 is pressed by the gasket 28 to fix the cutter 25. The adjusting bolt 27 can be installed to the adjusting threaded holes 29 at different heights to adjust the height of the cutter 25. In the process of adjusting the cutter 25, since the upper end of the cutter assembly 2 is restricted by the knife holder guide frame, it will not easily move in the front and rear directions, so that the positioning of the cutter 25 can be more accurate. The gasket 28 is provided with a plurality of holes, which can facilitate the installation of the adjusting bolt 27 in conjunction with the U-shaped groove 26.

[0083] When installed on sewing machines of different models, the height of the cutter 25 needs to be adjusted. The adjustment bolt 27 can be connected to the adjustment threaded holes 29 of different heights and the position of the gasket 28 can be changed to provide sufficient clamping force for the cutter 25 so that the cutter 25 is fixed on the adjustment bracket 222.

[0084] like Figure 1 and Figure 2 As shown, the width of the fixed bracket 221 is smaller than the distance between the needle bar 43 and the presser foot lifting rod 46 , so that the fixed bracket 221 extends out from between the needle bar 43 and the presser foot lifting rod 46 .

[0085] In order to reduce the cost of upgrading the sewing machines on the market, the present invention is a separate structure, which can be installed on the existing sewing machine housing 4 to achieve the upgrading of the sewing machine without having to specially manufacture a new sewing machine for production. Therefore, the width of the fixed bracket 221 should be smaller than the distance between the needle bar 43 and the presser foot lifting rod 46, which is convenient for installation and will not affect the normal operation of the sewing machine.

[0086] Since a separate drive motor 3 is used, the transmission between the cutter assembly 2 and other mechanisms is separated to reduce mutual interference. The controller can send signals to the drive motor 3 of the cutter assembly 2 and the drive motor of the sewing machine synchronously, so as to achieve synchronization of the presser foot lifting action, the thread piercing action and the edge cutting action, thereby improving the accuracy and stability of the sewing machine during operation.

[0087] like Figure 5 and Figure 6As shown, the cutter 25 is against the tungsten steel sheet 48 on the inner side of the needle plate 47. The actual role of the tungsten steel sheet 48 is to fix the cutter. Correspondingly, replacing the tungsten steel sheet 48 with other wear-resistant hard metal materials is also an equivalent replacement. Since tungsten steel itself has high hardness and strength, and has properties such as corrosion resistance and rust resistance, the tungsten steel sheet 48 made of tungsten steel has good wear resistance, so as to reduce the wear of the needle plate 47 due to the frequent up and down movement of the cutter 25, and at the same time, it can play a role in positioning the cutter 25, increasing the beauty of the finished product.

[0088] like Figure 4 and Figure 6 As shown, the bearing seat 1 is the end cover of the sewing machine;

[0089] The bearing base 1 is mounted on a casing 4 of the sewing machine.

[0090] The bearing seat 1 can be connected to the sewing machine casing 4 in the form of an end cover, which can reduce the cost of upgrading the existing sewing machine. At the same time, it does not affect the overall appearance of the sewing machine, and completes the assembly of the trimming device of the sewing machine without taking up too much space.

[0091] The knife rod 20 is sleeved with a sleeve 15 , and the knife rod 20 passes through the sleeve 15 and comes out from the assembly hole 16 .

[0092] The sleeve 15 can further reduce the shaking of the knife rod 20, reduce the displacement of the cutter assembly 2, and improve the accuracy of the cutter assembly 2. At the same time, the sleeve 15 can protect the knife rod 20 from colliding with the assembly hole 16, reducing the loss of the knife rod 20 due to friction.

[0093] The driving motor 3 is arranged horizontally, and the motor shaft 31 is parallel to the main shaft of the sewing machine.

[0094] By making the motor shaft 31 of the drive motor 3 parallel to the main shaft of the sewing machine, the reciprocating strokes between the cutting action, the piercing action and the presser foot lifting action can be made equivalent, which makes it easy to synchronize the frequencies between the drive motor 3 and the sewing machine motor through the controller, thereby avoiding the sewing machine from malfunctioning due to the different frequencies between the cutting action and other actions.

[0095] like Figure 4 and Figure 6 As shown, a cover 14 is provided on the bearing seat 1, and the cover 14 is used to protect the driving motor 3; the cover 14, the bearing seat 1 and the sewing machine housing 4 are connected by bolts.

[0096] The drive motor 3 is arranged in the cover 14. The cover is arranged behind the supporting seat 1 to facilitate the installation of the drive motor 3 and to protect the drive motor 3. The power is transmitted to the cutter assembly 2 through the crank connecting rod assembly 32 in the supporting seat 1, driving the cutter assembly 2 to move. The cover 14, the supporting seat 1 and the sewing machine casing 4 are connected by bolts, which is convenient for installation and can also provide good fixation.

[0097] like Figure 1 As shown, the tool holder guide frame 11 is a separate component independent of the supporting seat 1; accordingly, a person skilled in the art should realize that the present application does not exclude the design that the tool holder guide frame 11 and the supporting seat 1 are integrally formed, and the tool holder guide frame 11 is formed at the corresponding part on the supporting seat 1.

[0098] A sewing machine comprises the above-mentioned trimming device for the sewing machine.

[0099] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A trimming device for a sewing machine, comprising: A bearing seat (1) arranged on a sewing machine body; A driving motor (3) is mounted on the supporting base (1) and is used to provide power; A cutter assembly (2) is arranged on the bearing seat (1) and can be raised and lowered vertically; The crank-connecting rod assembly (32) is arranged in the bearing seat (1), one end of which is a power input end (35). The other end is a power output end (36); the power input end (35) is connected to the motor shaft (31) of the drive motor (3), and the power output end (36) is connected to the cutter assembly (2); A tool holder guide frame (11) is arranged in the bearing seat (1) and has a vertical slide groove (12); The power output end (36) is provided with a slider (13), the slider (13) is located in the slide groove (12), and the slider (13) is connected to the guide column (21) of the cutter assembly (2); the crank connecting rod assembly (32) converts the rotation of the motor shaft (31) into the vertical lifting of the cutter assembly (2); The crank-connecting rod assembly (32) comprises a crank sleeve (33), a connecting rod (34) and the guide column (21); The motor shaft (31) is provided with the crank sleeve (33), the swing end of the crank sleeve (33) is hinged to the upper end of the connecting rod (34), the lower end of the connecting rod (34) is sleeved on the guide column (21), one end of the guide column (21) is fixedly connected to the upper end of the cutter assembly (2), and the other end of the guide column (21) is connected to the slider (13); The width of the fixed bracket (221) in the cutter assembly (2) is smaller than the distance between the needle bar (43) and the presser foot lifting rod (46), so that the fixed bracket (221) extends from between the needle bar (43) and the presser foot lifting rod (46); The bearing seat (1) is an end cover of a sewing machine; The bearing seat (1) is mounted on a sewing machine casing (4).

2. A trimming device for a sewing machine according to claim 1, characterized in that: The cutter assembly (2) is provided with a cutter bar (20) and a cutter holder (22); the cutter holder (22) comprises a fixed bracket (221) and an adjustment bracket (222); the fixed bracket (221) is mounted on the lower end of the cutter bar (20), and a groove (23) adapted to the fixed bracket (221) is formed on the top end of the adjustment bracket (222). The adjusting bracket (222) is assembled on the fixing bracket (221) via the groove (23); The surface of the adjusting bracket (222) is provided with an adjusting groove (24), and a bolt passes through the adjusting groove (24) to screw the fixing bracket (221) and the adjusting bracket (222) together; A cutter (25) is installed at the lower portion of the adjustment bracket (222).

3. The trimming device of a sewing machine according to claim 2, characterized in that: A U-shaped groove (26) is formed at the top end of the cutter (25); a plurality of adjusting threaded holes (29) are formed on the adjusting bracket (222); an adjusting bolt (27) passes through the U-shaped groove (26) and is assembled into the adjusting threaded hole (29); a gasket (28) is provided between the adjusting bolt (27) and the U-shaped groove (26); The adjusting bolt (27) is used to achieve screw connection between the cutter (25), the gasket (28) and the adjusting bracket (222), and the cutter (25) is fixed to the adjusting bracket (222), so that the cutter (25) moves together with the cutter assembly (2).

4. The trimming device of a sewing machine according to claim 2, characterized in that: The cutter (25) abuts against a tungsten steel sheet (48) on the inner side of the needle plate (47).

5. The trimming device of a sewing machine according to claim 1, characterized in that: The driving motor (3) is arranged transversely, and the motor shaft (31) is parallel to the main shaft of the sewing machine.

6. The trimming device of a sewing machine according to claim 5, characterized in that: A cover shell (14) is provided on the bearing seat (1), and the cover shell (14) is used to protect the drive motor (3); the cover shell (14), the bearing seat (1) and the sewing machine casing (4) are connected by bolts.

7. A sewing machine, characterized in that: A trimming device for a sewing machine comprising the invention described in any one of claims 1 to 6.

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