CN107460655B - Bobbin winding device without prewinding and sewing machine - Google Patents

Abstract

The invention provides a bobbin winding device without pre-winding and a sewing machine, wherein the bobbin winding device comprises a shell and a winding shaft which is rotatably arranged in the shell, the winding shaft is provided with a bobbin shaft section which is positioned outside the shell and used for accommodating a bobbin, the bobbin winding device also comprises a winding liner and a thread cutting knife which is arranged on the front end surface of the winding liner opposite to the shell, the winding liner is sleeved on the bobbin shaft section and fixed on the winding shaft, the thread cutting knife is provided with a knife connecting part fixed on the winding liner and a knife cutting part which extends outwards from the periphery of the knife connecting part, and a thread clamping gap is formed between the knife cutting part and the winding liner; during the secant, earlier with the suture centre gripping in pressing from both sides the line clearance, cut off the suture by the sword secant portion again to make the end of a thread of suture behind the secant by fixed centre gripping in pressing from both sides the line clearance, and then when the wire winding next time, the drive spool rotates back suture and can twine on the spool of shuttle peg naturally, thereby removes the wire winding in advance from, realizes automatic wire winding.

Description

Bobbin winding device without prewinding and sewing machine

Technical Field

The invention relates to a bobbin winding device without pre-winding.

The invention also relates to a sewing machine comprising the bobbin winding device without prewinding.

Background

When the sewing machine is used for sewing the fabric, a rotating shuttle and a needle of the sewing machine are matched with each other to enable the bottom thread and the surface thread to be interwoven and sewn on the fabric in a linkage mode, and therefore stitches are formed. At present, the bobbin thread is generally short and only has the length of 20m-50m, so that the bobbin needs to be frequently replaced and the empty bobbin under replacement needs to be wound in the sewing process. The bobbin winding mode mainly comprises two modes of manual winding and winding of a winding device, the structure of the winding device capable of realizing winding can refer to the Chinese invention patent specification with the application number of 201410557879.X, the winding device is installed on a sewing machine and can be used independently, and the thread can be wound on a winding shaft of the bobbin and can be provided for the sewing machine to be used as a bottom thread source. However, in the prior art, no matter manual winding or wire device winding, it all needs to be around the line in advance before starting the winding, twine the suture on the spool of cop latch N circle in advance promptly, later carry out the winding again, so it can't realize automatic winding to make winding work efficiency lower, workman's wire winding operation intensity is higher, is unfavorable for improving sewing efficiency.

Disclosure of Invention

In view of the above-described drawbacks of the prior art, it is an object of the present invention to provide a bobbin winding device which does not require pre-winding and which can perform automatic winding.

In order to achieve the above object, the present invention provides a bobbin winding device without prewinding, comprising a housing and a winding shaft rotatably mounted in the housing, wherein the winding shaft is provided with a bobbin shaft section which is positioned outside the housing and used for accommodating a bobbin, the winding shaft further comprises a winding liner and a thread cutting knife arranged on the front end surface of the winding liner opposite to the housing, the winding liner is sleeved on the bobbin shaft section and fixed on the winding shaft, the thread cutting knife is provided with a knife connecting part fixed on the winding liner and a knife cutting line part extending outwards from the periphery of the knife connecting part, and a line clamping gap is formed between the knife cutting line part and the winding liner; when cutting the thread, the thread is clamped in the thread clamping gap and then cut off by the cutter cutting part.

Furthermore, a cutting line notch is formed in the cutting line part of the cutter, and a cutting line blade is arranged at the cutting line notch of the cutter cutting line part; the thread cutting blade is positioned at the inner side of the thread clamping gap along the radial direction of the bobbin shaft section.

Preferably, the outer end side of the cutter cutting line part is provided with a bending part which is bent forwards in the direction far away from the winding gasket, and a bayonet is formed between the bending part and the winding gasket; and the bayonet is positioned outside the thread clamping gap and communicated with the thread clamping gap along the radial direction of the bobbin shaft section.

The winding device further comprises a driving motor and an electric control module which are arranged in the shell, and a switch button which is arranged on the outer surface of the shell, wherein the rear end of the winding shaft which is positioned in the shell is fixedly connected with an output shaft of the driving motor, and the driving motor and the switch button are connected with the electric control module.

Furthermore, a first limit sensor and a second limit sensor which are oppositely arranged are fixed on the outer surface of the shell, the first limit sensor and the second limit sensor are both connected with the electronic control module, and a connecting line between the first limit sensor and the second limit sensor is tangent to the outer circumference of the winding groove on the shuttle peg.

Preferably, the output shaft of the driving motor is fixed with the winding shaft through a screw, and the connection position of the output shaft of the driving motor and the winding shaft is adjustable along the axial direction of the winding shaft.

The anti-reverse mechanism comprises an anti-reverse ratchet fixed on the spindle section of the shuttle peg, a spring hook plate fixed on the shell, an anti-reverse pawl with a fixed swing fulcrum and a first pre-tightening spring, wherein one end of the anti-reverse pawl is matched with the anti-reverse ratchet, and two ends of the first pre-tightening spring are respectively connected with the other end of the anti-reverse pawl and the spring hook plate.

Preferably, an axially extending fixing groove is formed in the outer peripheral surface of the bobbin shaft section, a second pre-tightening spring is fixedly installed in the fixing groove, and the middle part of the second pre-tightening spring protrudes outwards from the bobbin shaft section along the radial direction of the bobbin shaft section.

Further, still including installing the thread tension mechanism on the casing front side surface, thread tension mechanism including the trapping mechanism pole that is fixed in the casing, cross the line and collude, first trapping plate, second trapping plate, trapping spring and adjust knob and overlap in proper order after to before along the axial of trapping mechanism pole and establish on the trapping mechanism pole, adjust knob and trapping mechanism pole are screw-thread fit, trapping spring's both ends respectively with second trapping plate and adjust knob looks butt, be formed with the trapping mechanism groove between first trapping plate and the second trapping mechanism, the outer end department of crossing the line hook sets up the line hole of crossing that is located trapping mechanism groove periphery side.

The bobbin counter comprises a bobbin position screw, a counting unit, a first wire counting wheel, a second wire counting wheel and a wire passing groove, wherein the rear end of the bobbin position screw is fixed on the shell, the counting unit is rotatably arranged on the periphery of the bobbin position screw through a bearing, the first wire counting wheel and the second wire counting wheel are fixed on the periphery of the counting unit and are arranged in a front-back opposite mode, the wire passing groove is formed between the first wire counting wheel and the second wire counting wheel, and the wire passing groove is located on the front side of a rear side flange on the shuttle core; before winding, the suture thread passes through the thread clamping groove, the thread passing hole and the thread passing groove in sequence and then is clamped in the thread clamping gap.

Preferably, the counting unit includes first clamp plate and the second clamp plate of installing in the bearing periphery and front and back relative setting, with casing relatively fixed's number of turns sensor and be fixed in the first mark and the second mark of first clamp plate, the periphery at first clamp plate is fixed to first wire wheel, the periphery at the second clamp plate is fixed to the second wire wheel.

Preferably, the counting unit is an encoder, and the encoder is a photoelectric encoder, a magnetoelectric encoder, or a contact brush type encoder.

Furthermore, the first wire counting wheel and the second wire counting wheel respectively comprise a flat plate part which straightly extends along the radial direction of the wire counting shaft position screw and a sloping plate part which obliquely and outwardly extends from the outer peripheral side of the flat plate part, the flat plate part on the first wire counting wheel is abutted with the flat plate part on the second wire counting wheel, the sloping plate part on the first wire counting wheel and the sloping plate part on the second wire counting wheel are reversely inclined, and the space between the two forms the wire passing groove; the bevel plate part on the first wire counting wheel and the bevel plate part on the second wire counting wheel are both provided with a plurality of tooth sockets which are communicated from front to back, and the tooth sockets on the first wire counting wheel and the tooth sockets on the second wire counting wheel are arranged along the circumferential direction of the wire passing grooves in a staggered mode.

Preferably, a drawer is connected to the lower end of the housing, and the drawer has an accommodating groove with an upward opening.

The invention also provides a sewing machine, wherein the bobbin winding device is fixedly arranged on a machine shell of the sewing machine.

As described above, the bobbin winding device and the sewing machine according to the present invention, which do not require pre-winding, have the following advantageous effects:

in this application, when the back secant is accepted in the wire winding, earlier with the suture centre gripping in pressing from both sides the line clearance, cut off the suture by sword secant portion again to make the end of a thread of suture behind the secant fixed centre gripping in pressing from both sides the line clearance, and then when the wire winding next time, the drive spool rotates back suture can twine on the spool of shuttle peg naturally, thereby removes the wire winding in advance from, realizes automatic wire winding.

Drawings

Fig. 1 is a schematic structural view of a bobbin thread winding device according to the present application.

Fig. 2 and 3 are schematic structural views of the winding mechanism in the present application, and a driving motor is omitted in both fig. 2 and 3.

Fig. 4 is an exploded view of the wire winding mechanism of the present application.

Fig. 5 is a schematic structural diagram of a wire-wound gasket according to the present application.

Fig. 6 is a schematic structural view of the thread cutting knife in the present application.

Fig. 7 is a schematic structural diagram of a wire clamping mechanism in the present application.

Fig. 8 is an exploded view of the wire clamping mechanism of the present application.

Fig. 9 is a schematic structural diagram of the wire counting mechanism in the present application.

Fig. 10 is an exploded view of the wire counting mechanism of the present application.

Description of the element reference numerals

1 casing 19 adjusting knob

2 winding shaft 20 wire clamping groove

201 bobbin shaft section 21 thread position counting screw

202 fixed groove 22 bearing

3 first wire-counting wheel of wire-winding liner 23

301 first cavity 24 second wire-counting wheel

302 second cavity 241 flat plate portion

4 the bevel board part of the line cutter 242

401 gullet of blade attachment 243

402 line cutting part 25 wire passing groove

403 secant notch 26 first press plate

404 second pressing plate with line cutting blade 27

405 first mark of bending part 28

5 second mark of driving motor 29

6 switch button 30 suture

7 first limit sensor 31 bobbin

8 second limit sensor 311 mandrel

9 ratchet wheel 312 front flange

10 spring hook plate 313 back flange

11 anti-reverse-rotation pawl 32 drawer

12 first preloaded spring 33 input button

13 second pre-tightening spring 34 display screen

14 wire clamping rod 35 state display lamp

15 cross line and collude 36 circle number sensor

151 wire passing hole 100 wire winding mechanism

16 first clamp 200 anti-reverse mechanism

17 second clamping plate 300 wire clamping mechanism

18 trapping spring 400 meter line mechanism

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.

In the following embodiment, the axial direction of the spool 2 is defined as the front-rear direction, and the end of the spool 2 on which the bobbin 31 is fitted is defined as the leading end.

As shown in fig. 1, the present invention provides a bobbin winding device without prewinding, comprising a housing 1 and a winding mechanism 100 mounted on the housing 1, the winding mechanism 100 being used for winding a thread 30 on a bobbin 31. The bobbin 31 is a conventional structure, and as shown in fig. 4, mainly includes a core shaft 311 extending forward and backward, a front flange 312 provided at the front end of the core shaft 311, a rear flange 313 provided at the rear end of the core shaft 311, and a winding groove formed between the core shaft 311, the front flange 312, and the rear flange 313, and the winding groove is an annular groove. Further, as shown in fig. 2 to 4, the winding mechanism 100 includes a winding shaft 2 extending in a front-rear axial direction, a winding liner 3, and a thread cutting blade 4 provided on a front end surface of the winding liner 3 facing away from the housing 1, the winding shaft 2 is rotatably mounted in the housing 1, a front section of the winding shaft 2 has a bobbin shaft section 201 located outside the housing 1 and accommodating the bobbin 31, the winding liner 3 is fitted over the bobbin shaft section 201 and fixed to the winding shaft 2, the thread cutting blade 4 has a blade connecting portion 401 fixed to the winding liner 3, and a blade cutting portion 402 extending outward from an outer periphery of the blade connecting portion 401, and a thread clamping gap is formed between the blade cutting portion 402 and the winding liner 3. During winding, the bobbin 31 is sleeved on the bobbin shaft section 201 of the winding shaft 2, the winding shaft 2 drives the bobbin 31 to synchronously rotate, and then the thread 30 is wound on the mandrel 311 of the bobbin 31 until the thread 30 is filled in the winding groove of the bobbin 31; after the winding is finished, the bobbin 31 is taken down forwards from the bobbin shaft section 201 of the winding shaft 2, then the thread 30 is clamped in the thread clamping gap, and then the thread 30 is cut off by the cutter cutting part 402 of the thread cutter 4; therefore, the thread end of the cut thread 30 is clamped in the thread clamping gap, and then the bobbin 31 is sleeved on the bobbin shaft section 201 backwards in the next winding process, the thread 30 can be naturally wound on the winding shaft 2 of the bobbin 31 after the winding shaft 2 is driven to rotate, so that pre-winding is omitted, and automatic winding is realized.

Further, as shown in fig. 5, a stepped concave cavity is formed at the front side of the winding pad 3, the concave cavity includes a first cavity 301 with a smaller diameter and a second cavity 302 with a larger diameter, and the first cavity 301 is located at the rear side of the second cavity 302; as shown in fig. 6, the knife connecting portion 401 of the thread cutting knife 4 is disc-shaped, the knife thread cutting portion 402 extends outward along the radial direction of the knife connecting portion 401, and the knife connecting portion 401 is accommodated in the first cavity 301 and fixed to the winding liner 3 by a screw; when the bobbin 31 is fitted backward on the bobbin 2, the rear flange 313 of the bobbin 31 is received in the second cavity 302. A cutting line notch 403 is formed in the cutting line part 402 of the cutter, and a cutting line blade 404 is arranged at the cutting line notch 403 of the cutting line part 402 of the cutter; the thread cutting edge 404 is located inside the thread clamping gap in the radial direction of the bobbin shaft section 201, or in the radial direction of the knife attachment portion 401, the bobbin 31 and the winding liner 3, so that the thread 30 is easily caught in the thread clamping gap and then the thread 30 is introduced into the thread cutting gap 403 to be cut by the thread cutting edge 404. In order to facilitate the clamping of the suture 30 into the wire clamping gap, the outer end side of the knife cutting line part 402 is provided with a bending part 405 which is bent forwards in the direction away from the winding pad 3, and a bayonet is formed between the bending part 405 and the winding pad 3, so that the width of the bayonet is far larger than the width of the wire clamping gap in the front-back direction; and, the bayonet is located outside the thread trapping gap and communicates with the thread trapping gap in the radial direction of the bobbin shaft section 201.

As shown in fig. 1 to 4, the bobbin winding device further includes a driving motor 5 and an electronic control module installed in the housing 1, and a switch button 6 installed on the outer surface of the housing 1, the rear end of the winding shaft 2 located in the housing 1 is fixedly connected with the output shaft of the driving motor 5, and the driving motor 5 and the switch button 6 are both connected with the electronic control module. After the switch button 6 is pressed down, the electric control module receives the signal and controls the driving motor 5 to rotate, and then the driving motor 5 drives the winding shaft 2 and the shuttle peg 31 sleeved on the winding shaft 2 to rotate together, so that automatic winding is realized. In this embodiment, the output shaft of the driving motor 5 extends into the rear section of the winding shaft 2, the two are fixed by screws, and the connection position of the output shaft of the driving motor 5 and the winding shaft 2 is adjustable back and forth along the axial direction of the winding shaft 2, so that the extension amount of the winding shaft 2 extending forward from the front side surface of the housing 1 can be adjusted, and the position of the bobbin 31 sleeved on the winding shaft 2 relative to the housing 1, and the below-described thread clamping mechanism 300 and the thread counting mechanism 400 can be adjusted.

Preferably, as shown in fig. 1, a first limit sensor 7 and a second limit sensor 8 are fixed on the front side surface of the housing 1, the first limit sensor 7 and the second limit sensor 8 are both connected with the electronic control module, the installation positions of the first limit sensor 7 and the second limit sensor 8 are adjusted according to different sizes of the shuttle peg 31, so that a connecting line between the first limit sensor 7 and the second limit sensor 8 is tangent to the outer circumference of a winding groove on the shuttle peg 31, namely the triggering position of the first limit sensor 7 or the second limit sensor 8 is just coincided with the outer edge of a coil when a thread 30 is fully wound in the winding groove of the shuttle peg 31, or, when the bobbin 31 is fully wound with the thread 30 in the winding groove, the first limit sensor 7 or the second limit sensor 8 can be triggered to change the output signal of the first limit sensor 7 or the second limit sensor 8. In this embodiment, the first limit sensor 7 is configured to emit light, and the second limit sensor 8 is configured to receive the light emitted by the first limit sensor 7; in the process that the driving motor 5 drives the winding shaft 2 to rotate and realize winding, the first limit sensor 7 emits light to the second limit sensor 8, when the suture line 30 is not wound fully around the winding groove, no shielding object exists between the first limit sensor 7 and the second limit sensor 8, and the second limit sensor 8 can receive the light; when the winding groove of the bobbin 31 is fully wound with the thread 30, the outer edge of the coil on the bobbin 31 is just blocked between the first limit sensor 7 and the second limit sensor 8, so that the second limit sensor 8 cannot receive light, the output signal of the second limit sensor 8 changes, the electric control module can control the driving motor 5 to stop rotating according to the output signal of the second limit sensor 8, and the winding is finished.

As shown in fig. 2 to 4, the bobbin winding device further includes a reverse rotation preventing mechanism 200, the reverse rotation preventing mechanism 200 includes a reverse rotation preventing ratchet 9, a spring hook plate 10, a reverse rotation preventing pawl 11 having a fixed swing fulcrum, and a first pre-tightening spring 12, the ratchet wheel 9 is sleeved at the rear end of the bobbin shaft section 201 and fixed to the bobbin shaft section 201 by screws extending in the radial direction of the bobbin shaft section 201, the spring hook plate 10 is fixed to the right side surface of the housing 1 by a screw, the reverse rotation preventing pawl 11 is mounted to the housing 1 by a screw extending forward and backward, and the non-return pawl 11 is rotatably sleeved on the screw, so the screw forms a fixed swing fulcrum of the non-return pawl 11, and one end of the anti-reverse pawl 11 is matched with the anti-reverse ratchet 9, and two ends of the first pre-tightening spring 12 are respectively connected with the other end of the anti-reverse pawl 11 and the spring hook plate 10. In the anti-reverse mechanism 200, under the action of the anti-reverse pawl 11, the allowed rotation direction of the anti-reverse ratchet wheel 9 is the same as the winding direction, so that the winding shaft 2 is limited to rotate only in the same direction of the winding direction but not in reverse direction; therefore, when cutting the wire, due to the action of the acting force and the reaction force, the wire can apply the acting force opposite to the winding direction to the wire cutter 4, the partial acting force is simultaneously applied to the winding liner 3 and the winding shaft 2, the reverse rotation of the output shafts of the winding shaft 2 and the driving motor 5 can be effectively avoided through the reverse rotation preventing mechanism 200, the reverse rotation preventing mechanism 200 can lock the driving motor 5 to prevent the reverse rotation of the driving motor 5, and the self-locking mechanism has the self-locking function, so that the wire cutting can be operated by one hand, and the wire cutting process is simpler, more convenient and more humanized; and compared with the mode of adding a brake component to the driving motor 5, the mode of adding the anti-reverse mechanism 200 can effectively reduce the cost.

In this embodiment, the bobbin 31 is detachably connected to the bobbin shaft section 201 of the bobbin 2, and the specific connection structure between the bobbin and the bobbin shaft section is as follows: as shown in fig. 4, a fixing groove 202 axially extending in the front-rear direction is formed on the outer peripheral surface of the bobbin shaft section 201, a second pre-tightening spring 13 is fixedly installed in the fixing groove 202, and the middle part of the second pre-tightening spring 13 protrudes outward from the bobbin shaft section 201 along the radial direction of the bobbin shaft section 201; after the bobbin 31 is sleeved on the bobbin shaft section 201 of the winding shaft 2, the bobbin 31 and the bobbin shaft section 201 are relatively static under the action force of the second pre-tightening spring 13; when the bobbin 31 is removed forward from the bobbin shaft section 201, the biasing force of the second biasing spring 13 is overcome.

As shown in fig. 1, the bobbin winder further includes a thread clamping mechanism 300 mounted on the front surface of the housing 1, the thread clamping mechanism 300 being used to apply a tension to the thread 30 to tighten the thread 30 around the bobbin 31. In the present application, the wire clamping mechanism 300 adopts the following structure: as shown in fig. 7 and 8, the thread clamping mechanism 300 comprises a thread clamping rod 14 fixed on the housing 1, a thread passing hook 15, a first thread clamping plate 16, a second thread clamping plate 17, a thread clamping spring 18 and an adjusting knob 19, the wire clamping rod 14 is parallel to the winding shaft 2 and also extends forwards and backwards, the wire passing hook 15, the first wire clamping plate 16, the second wire clamping plate 17, the wire clamping spring 18 and the adjusting knob 19 are sequentially sleeved on the wire clamping rod 14 from back to front along the axial direction of the wire clamping rod 14, the adjusting knob 19 is in threaded fit with the wire clamping rod 14, so that the mounting position of the adjusting knob 19 on the wire clamping rod 14 can be adjusted back and forth, the two ends of the wire clamping spring 18 are respectively abutted against the second wire clamping plate 17 and the adjusting knob 19, a wire clamping groove 20 is formed between the first wire clamping plate 16 and the second wire clamping plate 17, and a wire passing hole 151 located on the outer peripheral side of the wire clamping groove 20 is formed in the outer end of the wire passing hook 15. Before winding, the thread 30 on the thread cylinder passes through the thread clamping groove 20 and the thread passing hole 151 in sequence and then is clamped between the thread cutter 4 and the winding liner 3, and in the winding process, the thread clamping mechanism 300 enables the thread 30 to be in a tensioning state; further, the urging force of the thread tension spring 18 on the second thread tension plate 17 can be adjusted by turning the adjustment knob 19, thereby adjusting the amount of tension applied to the suture 30 by the thread tension mechanism 300.

As shown in fig. 1, the bobbin thread winding device further includes a thread counting mechanism 400 mounted on the front side surface of the housing 1, the thread counting mechanism 400 being for recording the length of the thread 30 wound on the bobbin 31; the wire clamping mechanism 300, the wire counting mechanism 400 and the wire winding mechanism 100 are distributed in a triangular manner. As shown in fig. 9 and 10, the thread counting mechanism 400 includes a thread counting position screw 21 whose rear end is fixed to the housing 1, a counting unit rotatably mounted on the outer periphery of the thread counting position screw 21 via a bearing 22, a first thread counting wheel 23 and a second thread counting wheel 24 fixed on the outer periphery of the counting unit and arranged in a front-rear opposite manner, and a thread passing groove 25 formed between the first thread counting wheel 23 and the second thread counting wheel 24, the housing 1 has a mounting projection projecting forward for carrying the thread counting mechanism 400, and the thread passing groove 25 is located on the front side of a rear side edge 313 on the bobbin 31; before the winding is started, as shown in fig. 1, the thread 30 on the bobbin is sequentially inserted through the thread clamping groove 20, the thread passing hole 151 and the thread passing groove 25 and then clamped in the thread clamping gap. In the winding process, the thread 30 drives the first thread counting wheel 23 and the second thread counting wheel 24 to rotate, so that the counting unit is driven to rotate, the counting unit detects the number of turns of the first thread counting wheel 23 and the second thread counting wheel 24, the signal is sent to the electronic control module, the electronic control module automatically calculates the length of the thread 30 wound on the bobbin 31 according to the output signal of the counting unit, effective data are provided for controlling the bottom thread allowance in the use process of the subsequent bobbin 31, and the thread 30 is not influenced by the thickness of the thread 30. In this embodiment, the electronic control module is an integrated circuit board, as shown in fig. 1, an input button 33, a display screen 34 and a status display lamp 35 are further installed on the front side surface of the housing 1, the input button 33, the display screen 34 and the status display lamp 35 are all connected to the electronic control module, and the input button 33 can be used for setting various data, such as: setting winding amount data; the display screen 34 is used to display the amount of wire winding.

Further, the counting unit has the following preferred embodiments:

as shown in fig. 9 and 10, the first embodiment of the counting unit includes a first pressing plate 26 and a second pressing plate 27 which are installed on the periphery of the bearing 22 and are arranged in a front-back opposite manner, a turn number sensor 36 fixed opposite to the casing 1, and a first mark 28 and a second mark 29 fixed on the first pressing plate 26, the first wire wheel 23 is fixed on the periphery of the first pressing plate 26, and the second wire wheel 24 is fixed on the periphery of the second pressing plate 27. During winding, the first pressing plate 26 and the second pressing plate 27 rotate synchronously with the first wire counting wheel 23 and the second wire counting wheel 24, the first mark 28 and the second mark 29 rotate synchronously with the first pressing plate 26, the turn number sensor 36 periodically senses the first mark 28 and the second mark 29, so that the turn number sensor 36 can detect the turn number of the first wire counting wheel 23 and the second wire counting wheel 24, and the electronic control module further calculates the total length of the wound wire according to the value. Preferably, the turn number sensor 36 is of various types, such as: the turn number sensor 36 may be a hall sensor, and the first mark 28 and the second mark 29 are both magnets; alternatively, the turn number sensor 36 may be a photoelectric sensor, and then the first mark 28 and the second mark 29 are both light-reflecting members; alternatively, the turn number sensor 36 may be a counting brush, and the first mark 28 and the second mark 29 are both contacts; at the moment, a power-on electric brush is additionally arranged and used for connecting a low-voltage power supply; when the first wire counting wheel 23 and the second wire counting wheel 24 rotate, the contact points are in periodic contact with the counting electric brushes, the electric control module can record the on-off times of the circuit of the counting electric brushes, the on-off times are converted into the number of turns of the first wire counting wheel 23 and the second wire counting wheel 24 according to a certain relation, and then the total length of the wound wire is further calculated.

In the second embodiment of the counting unit, the counting unit is an encoder, and the encoder is a photoelectric encoder, a magnetoelectric encoder, or a contact brush type encoder. In the winding process, the encoder synchronously rotates along with the first wire counting wheel 23 and the second wire counting wheel 24, so that the number of turns of the first wire counting wheel 23 and the second wire counting wheel 24 is recorded, and the electric control module further calculates the total length of the wound wire according to the numerical value.

Further, each of the first and second routing wheels 23 and 24 includes a flat plate portion 241 extending straight in the radial direction of the routing axis screw 21, and a sloping plate portion 242 extending outward from the outer periphery side of the flat plate portion 241, the flat plate portion 241 on the first routing wheel 23 and the flat plate portion 241 on the second routing wheel 24 are in contact, the sloping plate portion 242 on the first routing wheel 23 is inclined forward, and the sloping plate portion 242 on the second routing wheel 24 is inclined backward, so that the sloping plate portion 242 on the first routing wheel 23 and the sloping plate portion 242 on the second routing wheel 24 are inclined back to back, and the space therebetween forms the routing groove 25; the plurality of tooth grooves 243 penetrating in the front-back direction are formed in both the inclined plate part 242 of the first wire counting wheel 23 and the inclined plate part 242 of the second wire counting wheel 24, and the tooth grooves 243 on the first wire counting wheel 23 and the tooth grooves 243 on the second wire counting wheel 24 are arranged in a staggered manner in the circumferential direction of the wire passing groove 25. The gullets 243 have two functions: 1. the material used for the inclined plate part 242 can be reduced, so that the overall weight of the first wire counting wheel 23 and the first wire counting wheel 24 is reduced, the rotational inertia is reduced, and the suture line 30 can drive the first wire counting wheel 23 and the first wire counting wheel 24 to rotate more easily; 2. due to the design of the inclined plate part 242 and the staggered tooth grooves, when the suture 30 passes through the first wire counting wheel 23 and the first wire counting wheel 24, the suture 30 can be slightly twisted, a certain pre-tightening effect is achieved, the acting force of the first wire counting wheel 23 and the second wire counting wheel 24 on the suture 30 is increased, larger friction force is generated, the suture 30 is prevented from slipping with the first wire counting wheel 23 and the first wire counting wheel 24, and the accuracy of the length of the wound suture 30 on the bobbin 31 is recorded.

Preferably, a drawer 32 is connected to the lower end of the housing 1, and the drawer 32 has a receiving groove with an upward opening therein for receiving the bobbin 31.

The bobbin winding device related to the application can be used independently, and can also be installed on a sewing machine for use.

The invention also provides a sewing machine, wherein the bobbin winding device is fixedly arranged on a machine shell of the sewing machine.

In conclusion, the bobbin winding device related to the application adopts the structure that the thread cutting knife 4 is combined with the winding liner 3, so that the thread end of the thread 30 after thread cutting is clamped in the thread clamping gap between the thread cutting knife 4 and the winding liner 3 every time, and further, when winding next time, the thread 30 does not need to be pre-wound on the bobbin 31 for N circles and then formal winding is started, and finally, full-automatic winding is realized, so that the winding operation is simpler and more convenient.

Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (13)

1. A bobbin winding device without prewinding, comprising a housing (1) and a winding shaft (2) rotatably mounted in the housing (1), the winding shaft (2) having thereon a bobbin shaft section (201) located outside the housing (1) for accommodating a bobbin (31), characterized in that: the bobbin winder further comprises a winding liner (3), a thread cutting knife (4) arranged on the front end face of the winding liner (3) back to the shell (1), a driving motor (5) and an electric control module which are all installed in the shell (1), and a switch button (6) installed on the outer surface of the shell (1), wherein the winding liner (3) is sleeved on the bobbin shaft section (201) and fixed on the winding shaft (2), the thread cutting knife (4) is provided with a knife connecting part (401) fixed on the winding liner (3) and a knife thread cutting part (402) extending outwards from the periphery of the knife connecting part (401), and a thread clamping gap is formed between the knife thread cutting part (402) and the winding liner (3); when cutting the thread, the thread (30) is clamped in the thread clamping gap, and then the thread (30) is cut by the cutter cutting part (402); the rear end of the winding shaft (2) in the shell (1) is fixedly connected with an output shaft of a driving motor (5), and the driving motor (5) and the switch button (6) are connected with an electric control module; a first limit sensor (7) and a second limit sensor (8) which are oppositely arranged are fixed on the outer surface of the shell (1), the first limit sensor (7) and the second limit sensor (8) are connected with an electric control module, and a connecting line between the first limit sensor (7) and the second limit sensor (8) is tangent to the outer circumference of a winding groove on the shuttle peg (31); when the full thread (30) is wound in the winding groove of the bobbin (31), the first limit sensor (7) or the second limit sensor (8) can be triggered just to enable the output signal of the first limit sensor (7) or the second limit sensor (8) to change, and the electric control module controls the driving motor (5) to stop according to the output signal of the first limit sensor (7) or the second limit sensor (8).

2. The bobbin winding device according to claim 1, wherein: a secant notch (403) is formed in the cutter secant part (402), and a secant blade (404) is arranged at the secant notch (403) of the cutter secant part (402); the thread cutting edge (404) is located inside the thread clamping gap in the radial direction of the bobbin shaft section (201).

3. The bobbin winding device according to claim 1, wherein: a bending part (405) which is bent forwards in the direction far away from the winding gasket (3) is arranged on the outer end side of the cutter cutting line part (402), and a bayonet is formed between the bending part (405) and the winding gasket (3); the bayonet is located on the outer side of the thread clamping gap and communicated with the thread clamping gap along the radial direction of the bobbin shaft section (201).

4. The bobbin winding device according to claim 1, wherein: the output shaft of the driving motor (5) is fixed with the winding shaft (2) through a screw, and the connecting position of the output shaft of the driving motor (5) and the winding shaft (2) is adjustable along the axial direction of the winding shaft (2).

5. The bobbin winding device according to claim 1, wherein: the anti-reverse mechanism (200) comprises an anti-reverse ratchet wheel (9) fixed on the spindle section (201) of the shuttle peg, a spring hook plate (10) fixed on the shell (1), an anti-reverse pawl (11) with a fixed swing fulcrum and a first pre-tightening spring (12), one end of the anti-reverse pawl (11) is matched with the anti-reverse ratchet wheel (9), and two ends of the first pre-tightening spring (12) are respectively connected with the other end of the anti-reverse pawl (11) and the spring hook plate (10).

6. The bobbin winding device according to claim 1, wherein: the outer peripheral surface of the bobbin shaft section (201) is provided with an axially extending fixing groove (202), a second pre-tightening spring (13) is fixedly installed in the fixing groove (202), and the middle part of the second pre-tightening spring (13) protrudes outwards from the bobbin shaft section (201) along the radial direction of the bobbin shaft section (201).

7. The bobbin winding device according to claim 1, wherein: the wire clamping mechanism (300) is arranged on the front side surface of the shell (1), the wire clamping mechanism (300) comprises a wire clamping rod (14) fixed on the shell (1), a wire passing hook (15), a first wire clamping plate (16), a second wire clamping plate (17), a wire clamping spring (18) and an adjusting knob (19), the wire-passing hook (15), the first wire clamping plate (16), the second wire clamping plate (17), the wire clamping spring (18) and the adjusting knob (19) are sequentially sleeved on the wire clamping rod (14) from back to front along the axial direction of the wire clamping rod (14), the adjusting knob (19) is in threaded fit with the wire clamping rod (14), two ends of the wire clamping spring (18) are respectively abutted against the second wire clamping plate (17) and the adjusting knob (19), a wire clamping groove (20) is formed between the first wire clamping plate (16) and the second wire clamping plate (17), the outer end of the wire-passing hook (15) is provided with a wire-passing hole (151) positioned on the outer peripheral side of the wire-clamping groove (20).

8. The bobbin winding device according to claim 7, wherein: the bobbin thread counting mechanism (400) is mounted on the front side surface of the shell (1), the bobbin thread counting mechanism (400) comprises a bobbin position screw (21) with the rear end fixed on the shell (1), a counting unit rotatably mounted on the periphery of the bobbin position screw (21) through a bearing (22), a first winding wheel (23) and a second winding wheel (24) which are fixed on the periphery of the counting unit and are arranged in a front-back opposite mode, and a thread passing groove (25) formed between the first winding wheel (23) and the second winding wheel (24), and the thread passing groove (25) is located on the front side of a rear side flange (313) on the shuttle core (31); before winding, the thread (30) passes through the thread clamping groove (20), the thread passing hole (151) and the thread passing groove (25) in sequence and then is clamped in the thread clamping gap.

9. The bobbin winding device according to claim 8, wherein: the counting unit is including installing first clamp plate (26) and second clamp plate (27) that relative set up around and in bearing (22) periphery and with casing (1) number of turns sensor (36) relatively fixed and be fixed in first mark (28) and second mark (29) of first clamp plate (26), the periphery at first clamp plate (26) is fixed in first wire wheel (23), the periphery at second clamp plate (27) is fixed in second wire wheel (24).

10. The bobbin winding device according to claim 8, wherein: the counting unit is an encoder which is a photoelectric encoder, a magnetoelectric encoder or a contact brush type encoder.

11. The bobbin winding device according to claim 8, wherein: the first wire counting wheel (23) and the second wire counting wheel (24) respectively comprise a flat plate part (241) which straightly extends along the radial direction of the wire counting shaft position screw (21) and a sloping plate part (242) which obliquely and outwardly extends from the outer peripheral side of the flat plate part (241), the flat plate part (241) on the first wire counting wheel (23) is abutted with the flat plate part (241) on the second wire counting wheel (24), the sloping plate part (242) on the first wire counting wheel (23) and the sloping plate part (242) on the second wire counting wheel (24) are reversely inclined, and the space between the two forms the wire passing groove (25); the inclined plate part (242) on the first wire counting wheel (23) and the inclined plate part (242) on the second wire counting wheel (24) are both provided with a plurality of tooth grooves (243) which are penetrated through from front to back, and the tooth grooves (243) on the first wire counting wheel (23) and the tooth grooves (243) on the second wire counting wheel (24) are arranged in a staggered mode along the circumferential direction of the wire passing grooves (25).

12. The bobbin winding device according to claim 1, wherein: the lower extreme of casing (1) is connected with drawer (32), have the accepting groove that the opening is up in drawer (32).

13. A sewing machine characterized by: a bobbin winding device as claimed in any one of claims 1 to 12 is fixedly mounted on a housing of the sewing machine.

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