CN218115811U - Edge trimming device of a sewing machine and the sewing machine - Google Patents

Abstract

The utility model aims at providing a trimming device of a sewing machine, which has simple operation, more accuracy and convenient installation and is separated from other mechanisms in transmission; the trimming device comprises a bearing seat, a driving motor and a trimming component, wherein the driving motor and the trimming component are arranged in the bearing seat; the driving motor transmits power into the edge starting assembly through the crank connecting rod assembly; the edge cutting assembly is driven to vertically lift by matching with the tool rest guide frame and a sliding block arranged in a vertical sliding chute of the tool rest guide frame; the trimming component is provided with a cutter bar and a cutter rest; the tool rest comprises a fixed bracket and an adjusting bracket; the lower part of the adjusting bracket is provided with a cutter; a plurality of adjusting threaded holes are formed in the adjusting bracket, and the height of the cutter can be adjusted through the adjusting threaded holes; the bearing seat can be arranged on the shell of the sewing machine; the driving motor is transversely arranged, and a motor shaft is parallel to a main shaft of the sewing machine; the bearing seat is provided with a housing which is used for protecting the driving motor; the cover bearing seat is connected with the sewing machine shell through a bolt.

Description

Edge trimming device of a sewing machine and the sewing machine

technical field

The utility model relates to the field of sewing machines, in particular to an edge trimming device of a sewing machine.

Background technique

Patent No. CN201020525945.2 discloses a synchronous vertical edge trimming integrated feed sewing machine, by connecting the knife bar cam and needle bar crank on the same main shaft, the cutting knife action is kept in line with the barbed thread take-up action and presser foot action Make up and down vertical movement at the same frequency.

There is following shortcoming in this technical scheme:

1. The edge trimming component is driven by the main shaft to perform the edge trimming action. When the fabric needs to be rotated, the main shaft stops rotating and the presser foot is lifted. At this time, the edge trimming of the fabric cannot be performed.

2. The knife bar cam and the needle bar crank are connected on the same main shaft, and are positioned and connected by pins. Through the action between the machines, the synchronization between the action of the cutter, the action of the thread pick-up and the action of the presser foot is realized. This method It is easy to interfere with the trimming action, which is not precise and stable enough.

3. The cutting edge assembly adjusts the position of the cutting knife on the horizontal plane through two knife rest guide frames, which is not only cumbersome to adjust, but also difficult to ensure accuracy.

4. The trimming assembly is manually controlled by the knife lever and the clutch knob, which makes the operation more inconvenient. At the same time, additional components are added to make the internal structure of the sewing machine too compact, which is inconvenient for the maintenance and upgrading of the sewing machine.

Utility model content

The purpose of the utility model is to provide an edge trimming device of a sewing machine which is easy to operate, more precise, easy to install, and separated from other mechanisms.

The purpose of this utility model is achieved like this:

A trimming device of a sewing machine, comprising

The bearing seat is arranged on the main body of the sewing machine;

The driving motor is installed on the bearing seat and used to provide power;

The edge trimming assembly is set on the bearing seat and can be lifted vertically;

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 trimming assembly;

The knife rest guide frame is arranged in the bearing seat and has a vertical chute; the power output end is provided with a slider, and the slider is located in the chute, and the slider and the trimming assembly The guide posts are connected; the crank connecting rod assembly converts the rotation of the motor shaft into the vertical lifting of the trimming assembly.

Preferably, the crank connecting rod assembly includes a crank bush connecting rod and a guide post; the crank bush is pierced on the motor shaft, and the swing end of the crank bush is hinged to the upper end of the connecting rod, so that The lower end of the connecting rod is sleeved on the guide post, one end of the guide post is fixedly connected with the upper end of the trimming assembly, and the other end of the guide post is connected with the slider.

Preferably, the edge trimming assembly is provided with a knife rod and a knife holder; the knife holder includes a fixed bracket and an adjustment bracket; the fixed bracket is installed at the lower end of the knife rod, and the top end of the adjustment bracket is formed with a The groove that the fixing bracket is adapted to, the adjusting bracket is assembled on the fixing bracket through the groove;

And the surface of the adjustment bracket is provided with an adjustment groove, and the bolt passes through the adjustment groove to screw the fixed bracket and the adjustment bracket into one body;

A cutter is installed at the bottom of the adjusting bracket.

Preferably, the top of the cutter is formed with a U-shaped groove, and several adjusting threaded holes are opened on the adjusting bracket, and the adjusting bolts pass through the U-shaped grooves and are assembled into the adjusting threaded holes, and the adjusting bolts and Gaskets are arranged between the U-shaped grooves;

Through the adjusting bolt, realize the screw connection between the gasket of the cutter and the adjusting bracket, and fix the cutter on the adjusting bracket, so that the cutter can follow the trimming assembly Exercise together.

Preferably, the width of the fixing bracket is smaller than the distance between the needle bar and the presser foot lifter bar, so that the fixing bracket protrudes from between the needle bar and the presser foot lifter bar.

Preferably, the cutter abuts against the tungsten steel sheet inside the needle plate.

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

The bearing seat is installed on the sewing machine casing.

Preferably, the drive motor is arranged laterally, and the motor shaft is parallel to the main shaft of the sewing machine.

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

A sewing machine comprises the above-mentioned edge trimming device of the sewing machine.

Compared with the prior art, the utility model has outstanding and beneficial technical effects as follows:

1. The edge trimming device is equipped with a separate driving motor, which no longer needs the motor drive of the sewing machine. When the angle of the cloth is turned, the edge trimming device can still perform the edge trimming action.

2. The edge trimming device can be sold independently. When assembling, you only need to tighten the bearing seat and the sewing machine housing with bolts. There is no additional mechanical connection structure. The screw holes can follow the holes on the original model and be controlled independently. And it is easy to install; it is also very suitable for old models, suitable for upgrading and refitting.

3. The drive motor and the upper shaft motor of the sewing machine are respectively located at the two ends of the frame, and are basically on the same straight line. When the two motors work at the same time, the effect of dynamic balance can be achieved, and the vibration of sewing can be reduced to a certain extent. , improve the comfort of use.

4. Due to the use of a separate drive motor, the edge trimming action is separated from other actions, reducing the mutual interference between the machines. At the same time, the controller is used to synchronize the signals sent by the two drive motors, which improves the accuracy of the sewing machine when it is working. sex and stability.

5. The trimming component is fixed on the end cover, and the position of the cutter in the front and rear directions is fixed by a knife holder guide frame. The horizontal and vertical positions of the cutter can be adjusted by adjusting the groove on the bracket and adjusting the threaded hole. The upper position is convenient for the precise positioning of the cutter, and at the same time improves the flexibility of the cutter.

6. By removing the trimming device from the sewing machine, it not only simplifies the cutter device, but also reduces the types and quantities of components, making the internal space of the sewing machine no longer compact and easy to maintain.

7. The edge trimming device is set inside the bearing seat, and the bearing seat can be connected with the sewing machine through bolts. In addition, the controller is used to realize the synchronization of the driving motor of the edge trimming device and the sewing machine motor, which can keep the original mechanism of the sewing machine. Achieve product upgrades for sewing machines.

Description of drawings

Fig. 1 is a structural diagram of the utility model.

Fig. 2 is a structural diagram of the trimming assembly of the utility model.

Fig. 3 is an exploded view of the utility model.

Fig. 4 is the structural diagram after the utility model and the sewing machine are assembled.

Fig. 5 is an enlarged view of A in Fig. 4 .

Fig. 6 is a cross-sectional view of the utility model after it has been assembled with the sewing machine.

Reference signs: 1-bearing seat; 11-knife holder guide frame; 12-sliding groove; 13-slider; 14-cover; 15-sleeve; 16-assembly hole;

2-trimming assembly; 20-knife rod; 21-guide column; 22-knife holder; 221-adjusting bracket; 222-fixing bracket; 23-groove; 24-adjusting groove; 25-cutter; 26-U Groove; 27-adjusting bolt; 28-gasket; 29-adjusting threaded hole;

3-drive motor; 31-motor shaft; 32-crank connecting rod assembly; 33-crank sleeve; 34-connecting rod;

4-sewing machine casing; 41-barbed thread mechanism; 42-needle; 43-needle bar; 44-presser foot mechanism; 45-presser foot; 46-presser foot lever; 47-needle plate; ;

100 - Sewing machine upper shaft motor.

detailed description

The following are specific embodiments of the utility model, and the technical solutions of the utility model are further described in conjunction with the accompanying drawings, but the utility model is not limited to these embodiments.

As shown in Figures 1-3, a trimming device of a sewing machine includes

Bearing seat 1, which is arranged on the main body of the sewing machine;

The driving motor 3 is installed on the bearing seat 1 and is used to provide power;

The trimming assembly 2 is arranged on the bearing seat 1 and can be lifted vertically;

Crank connecting rod assembly 32, is arranged in bearing seat 1, and its one end is power input end 35, and the other end is power output end 36; Power input end 35 is connected with the motor shaft 31 of drive motor 3, power output end 36 and trimming Component 2 connection;

The knife rest guide frame 11 is arranged in the bearing seat 1 and has a vertical chute 12; the power output end 36 is provided with a slide block 13, and the slide block 13 is located in the chute 12, and the slide block 13 and the trimming assembly 2 The guide column 21 is connected; the crank connecting rod assembly 32 converts the rotation of the motor shaft 31 into the vertical lifting of the trimming assembly 2 .

The edge trimming assembly 2 is driven by the driving motor 3 , when the driving motor 3 starts, the power input end 35 transmits energy to the edge trimming assembly 2 connected to the power output end 36 through the crank connecting rod assembly 32 .

Since the tool holder guide frame 11 is vertically fixed on the bearing seat 1, the horizontal displacement of the slider 13 is limited by the chute 12, so that the slider 13 can only reciprocate in the up and down direction. Because the slide block 13 is connected with the guide post 21, when the guide post 21 is driven by the power output end 36 to move, the slide block 13 limits the horizontal displacement of the guide post 21 at the same time, so that the rotation of the motor shaft 31 becomes The edge trimming assembly 2 is vertically lifted, while reducing the shaking of the edge trimming assembly 2 and improving the accuracy of the cutter 25 .

As shown in Figures 1-3, the crank connecting rod assembly 32 includes a crank bush 33, a connecting rod 34 and a guide post 21; The upper end of 34 is hinged, the lower end of connecting rod 34 is sleeved on the guide post 21, one end of guide post 21 is fixedly connected with the upper end of trimming assembly 2, and the other end of guide post 21 is connected with slide block 13.

When the drive motor 3 starts, the crank bush 33 fixed on the motor shaft 31 by bolts also rotates with the motor shaft 31, and drives the guide post 21 to move through the connecting rod 34. The slide block 13 in the frame 11 is connected, so the guide post 21 can only move in the direction of the knife rest guide frame 11.

The other end of the guide post 21 is connected with the knife bar 20 of the trimming assembly 2, so when the guide post 21 is driven by the drive motor 3 and starts to move, it will drive the knife bar 20 to move along the direction of the knife rest guide frame 11, thereby The power generated by the driving motor 3 is transmitted to the trimming assembly 2 .

As shown in Figures 1-3, the trimming assembly 2 is provided with a knife bar 20 and a knife rest 22; the knife rest 22 includes a fixed bracket 222 and an adjusting bracket 221; The top is formed with a groove 23 adapted to the fixing bracket 222, and the adjusting bracket 221 is assembled on the fixing bracket 222 through the groove 23;

Knife rest 22 is used for connecting knife bar 20 and cutting knife 25, and one end of fixed bracket 222 is connected with the bottom end of knife bar 20, and the top of adjustment bracket 221 is formed with the groove 23 that fits with fixed bracket 222, and adjustment bracket 221 passes through The groove 23 is fitted on the other end of the fixing bracket 222 .

And the adjustment bracket 221 surface has an adjustment groove 24, and the bolt passes through the adjustment groove 24 to screw the fixed bracket 222 and the adjustment bracket 221 into one; the bottom of the adjustment bracket 221 is equipped with a cutter 25.

During operation, the function of moving the adjustment bracket 221 can be realized by changing the position where the bolt passes through the adjustment slot 24, and then the position of the cutter 25 in the left-right direction can be adjusted.

As shown in Figures 3-6, a U-shaped groove 26 is formed on the top of the cutter 25, and several adjusting threaded holes 29 are opened on the adjusting bracket 221. The adjusting bolt 27 passes through the U-shaped groove 26 and is assembled into the adjusting threaded hole 29. A gasket 28 is arranged between the U-shaped groove 26;

Through the adjustment bolt 27, the screw connection between the cutter 25, the pad 28 and the adjustment bracket 221 is realized, and the cutter 25 is fixed on the adjustment bracket 221, so that the cutter 25 can move with the trimming assembly 2.

After the adjusting bolt 27 is tightened, the U-shaped groove 26 formed on the top of the cutting knife 25 is pressed by the gasket 28, so that the cutting knife 25 is fixed. The adjustment bolt 27 can be installed to the adjustment screw holes 29 of different heights to realize the function of adjusting the height of the cutter 25. In the process of adjusting the cutter 25, since the upper end of the edge trimming assembly 2 is restricted by the knife rest guide frame, it will not easily occur. The displacement in the front-back direction can make the positioning of the cutter 25 more precise. The spacer 28 is provided with several holes, and the U-shaped groove 26 can be used to facilitate the installation of the adjusting bolt 27 .

When being installed on different types of sewing machines, it is necessary to adjust the height of the cutter 25, and the adjustment screw 27 can be connected to the adjustment threaded hole 29 of different heights, and the position of the gasket 28 can be changed to provide enough for the cutter 25. The clamping force makes the cutter 25 fixed on the adjustment bracket 221.

As shown in FIGS. 1 and 2 , the width of the fixed bracket 222 is smaller than the distance between the needle bar 43 and the presser foot lifter 46 , so that the fixed bracket 222 protrudes from between the needle bar 43 and the presser foot lifter 46 .

In order to reduce the cost required for upgrading the sewing machines on the market, the utility model is a separate structure, which can be installed on the existing sewing machine casing 4 to realize the upgrading and transformation of the sewing machine without specially making a new sewing machine and putting it into production. Therefore, the width of the fixed bracket 222 should be smaller than the distance between the needle bar 43 and the presser foot bar 46, which is convenient for installation and does not affect the normal operation of the sewing machine.

Due to the use of a separate drive motor 3, the transmission between the trimming assembly 2 and other mechanisms is separated, reducing mutual interference. The controller can synchronously send signals to the drive motor 3 of the edge trimming assembly 2 and the drive motor of the sewing machine to realize the synchronization of the presser foot lifting action, thread piercing action and edge trimming action, which improves the accuracy and stability of the sewing machine when it is working.

As shown in Fig. 5 and Fig. 6, the cutting knife 25 abuts against the tungsten steel sheet 48 inside the needle plate 47. Wear-resistant hard metal materials are also an equivalent replacement. Due to the high hardness and strength of tungsten steel itself, and the properties of corrosion resistance and not easy to rust, the tungsten steel sheet 48 made of tungsten steel has good wear resistance, so as to reduce the frequent movement of the cutter 25 up and down, so that the needle plate 47 wears and tear, can play the effect of positioning to cutting knife 25 simultaneously, increases the attractive in appearance of finished product.

As shown in Figure 4 and Figure 6, the bearing seat 1 is the end cover of the sewing machine;

The bearing base 1 is mounted on the sewing machine casing 4 .

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 and transforming the existing sewing machine, and at the same time complete the assembly of the trimming device of the sewing machine without affecting the overall appearance of the sewing machine. Take up too much space.

The cutter bar 20 is sleeved with the sleeve 15 , and the cutter bar 20 passes through the sleeve 15 and goes out from the assembly hole 16 .

Through the sleeve 15, the shaking of the knife rod 20 can be further reduced, the displacement of the edge trimming assembly 2 can be reduced, and the accuracy of the edge trimming assembly 2 can be improved. At the same time, the sleeve 15 can protect the knife rod 20 from colliding with the assembly hole 16, Reduce the loss of the tool holder 20 due to friction.

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

Make the motor shaft 31 of the driving motor 3 parallel to the main shaft of the sewing machine, so that the reciprocating strokes between the cutting knife action, the stabbing action and the presser foot lifting action are equivalent, and it is convenient to synchronize the frequency between the driving motor 3 and the sewing machine motor through the controller. , to avoid the sewing machine not working properly due to the difference in frequency between the cutter action and other actions.

As shown in Figures 4 and 6, the bearing seat 1 is provided with a casing 14, and the casing 14 is used to protect the driving motor 3; the casing 14, the bearing seat 1 and the sewing machine casing 4 are connected by bolts.

The driving motor 3 is arranged in the casing 14, and the casing is arranged behind the bearing seat 1 to facilitate the installation of the driving motor 3, and also to protect the driving motor 3, and the power is transmitted to the trimming through the crank connecting rod assembly 32 in the bearing seat 1 In the component 2, the edge trimming component 2 is driven to move, and the casing 14, the bearing seat 1 and the sewing machine casing 4 are connected by bolts, which is not only convenient for installation, but also provides good fixation.

As shown in Figure 1, the tool rest guide frame 11 is a separate component independent of the bearing seat 1; correspondingly, those skilled in the art should recognize that the present application does not exclude the tool rest guide frame 11 and the bearing seat 1 is an integrally formed design, and the knife rest guide frame 11 is a corresponding part formed on the bearing seat 1.

A sewing machine comprises the above-mentioned edge trimming device of the sewing machine.

The foregoing embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore: all equivalent changes made according to the structure, shape, and principle of the present utility model should be covered by this utility model. within the scope of protection of utility models.

Claims (10)

1. A trimming device of a sewing machine is characterized by comprising

A bearing seat (1) arranged on the sewing machine main body;

the driving motor (3) is arranged on the bearing seat (1) and is used for providing power;

the trimming component (2) is arranged on the bearing seat (1) and can vertically lift;

the crank connecting rod assembly (32) is arranged in the bearing seat (1), one end of the crank connecting rod assembly is a power input end (35), and the other end of the crank connecting rod assembly is a power output end (36); the power input end (35) is connected with a motor shaft (31) of the driving motor (3), and the power output end (36) is connected with the trimming assembly (2).

2. The trimming device of a sewing machine according to claim 1, characterized in that it further comprises a knife holder guide (11) arranged inside said carrier (1); the tool rest guide frame (11) is provided with a vertical sliding groove (12); the power output end (36) is provided with a sliding block (13), the sliding block (13) is positioned in the sliding groove (12), and the sliding block (13) is connected with a guide post (21) of the trimming component (2); the crank connecting rod assembly (32) converts the rotation of the motor shaft (31) into the vertical lifting of the trimming assembly (2);

the crank connecting rod component (32) comprises a crank shaft sleeve (33), a connecting rod (34) and the guide post (21); the motor shaft (31) is provided with the crank shaft sleeve (33) in a penetrating mode, the swinging end of the crank shaft 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 pillar (21), one end of the guide pillar (21) is fixedly connected with the upper end of the trimming assembly (2), and the other end of the guide pillar (21) is connected with the sliding block (13).

3. Trimming device of a sewing machine according to claim 1, characterized in that the trimming assembly (2) is provided with a knife bar (20) and a knife holder (22); the tool rest (22) comprises a fixing bracket (222) and an adjusting bracket (221); the fixed support (222) is arranged at the lower end of the cutter bar (20), a groove (23) matched with the fixed support (222) is formed at the top end of the adjusting support (221), and the adjusting support (221) is assembled on the fixed support (222) through the groove (23);

an adjusting groove (24) is formed in the surface of the adjusting bracket (221), and a bolt penetrates through the adjusting groove (24) to bolt the fixing bracket (222) and the adjusting bracket (221) into a whole;

the lower part of the adjusting bracket (221) is provided with a cutter (25).

4. The trimming device of a sewing machine according to claim 3, wherein 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 (221), an adjusting bolt (27) is inserted into the adjusting threaded holes (29) through the U-shaped groove (26), and a gasket (28) is arranged between the adjusting bolt (27) and the U-shaped groove (26);

the adjusting bolt (27) is used for realizing the screw connection among the cutting knife (25), the gasket (28) and the adjusting bracket (221), and the cutting knife (25) is fixed on the adjusting bracket (221), so that the cutting knife (25) can move along with the trimming component (2).

5. The trimming device of a sewing machine according to claim 4, wherein the width of the fixing bracket (222) is smaller than the distance between the needle bar (43) and the foot lifting lever (46) so that the fixing bracket (222) protrudes from between the needle bar (43) and the foot lifting lever (46).

6. Trimming device for sewing machines according to claim 5, characterized in that the cutter (25) rests on a tungsten steel plate (48) inside the needle plate (47).

7. Trimming device for sewing machines according to claim 1, characterized in that said carrier (1) is an end cap of a sewing machine;

the bearing seat (1) is arranged on a sewing machine shell (4).

8. Trimming device according to claim 7, characterized in that said drive motor (3) is arranged transversely, said motor shaft (31) being parallel to the main axis of the sewing machine.

9. The trimming device of a sewing machine according to claim 8, characterized in that said carrying seat (1) is provided with a cover (14), said cover (14) being intended to protect the drive motor (3); the cover shell (14), the bearing seat (1) and the sewing machine shell (4) are connected through bolts.

10. A sewing machine characterized by comprising the edge cutting device of the sewing machine according to any one of claims 1 to 9.

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