CN217104303U - Sewing machine - Google Patents

Abstract

The sewing machine is characterized by further comprising a swing rod, wherein the cloth feeding shaft driving source is provided with an output shaft, the swing rod is mounted on the output shaft, the swing rod is hinged with the crank, the connecting crank is fixed on the cloth feeding shaft, the cloth feeding shaft is movably connected with the cloth feeding tooth frame, and the cloth feeding tooth frame is fixedly provided with the cloth feeding teeth; the swing rod is hinged with the connecting rod, and the connecting rod is hinged with the crank. The utility model provides a sewing machine does not set up swing seat, utilizes the function that the swing seat has directly been replaced to the driving source drive swinging arms of work feed axle, can implement the gauge needle to gauge needle adjustment mechanism and adjust, can also implement the action of location feed dog zero point position to zero position positioning mechanism, and the sewing machine of this application has apparent convenient assembling, and the structure is retrencied more, has saved swing seat and has reduced the manufacturing degree of difficulty and cost simultaneously.

Description

Sewing machine

Technical Field

The application discloses a sewing machine relates to sewing machine manufacturing technical field.

Background

The swing seat of the sewing machine is an important part for adjusting the needle pitch, is arranged between the connecting rod and the cloth feeding shaft crank, and the needle pitch adjustment and the backstitch are realized by adjusting the angle of the swing seat. In the early days, the needle pitch on the sewing machine is adjusted by rotating the swing seat connected to the rotating shaft, the new needle pitch is generated by adjusting the angle of the swing seat which drives the swing seat to rotate to different angles along the circumferential direction of the axis of the rotating shaft, the manual adjustment of the swing seat is inconvenient, and the adjustment efficiency is low. Many sewing machines carry out the automatically regulated of gauge needle through the motor nowadays, and its process is that the motor drives the swing of gauge needle regulation crank, and then drives the swing of gauge needle regulation connecting rod, finally changes the wobbling range of main shaft drive pay-off axle, realizes the automatically regulated of sewing gauge needle. The swing seat is used as a key part for the operation of the sewing machine, the manufacture is more complicated, the noise is higher in the use process, the fault often occurs, in addition, the stable operation of the swing seat is realized only by the cooperative operation of a lubricating system of the sewing machine, and the lubricating system is needed to be very relevant to the use of the swing seat in the working process.

Disclosure of Invention

To above-mentioned sewing machine swing seat gauge needle adjust and the high problem of its operation requirement, this application provides a sewing machine of no swing seat to solve above-mentioned problem, have feed shaft driving source, connection crank, feed shaft, feed dog frame and feed dog, its characterized in that still has the swinging arms, the feed shaft driving source has the output shaft, installs the swinging arms on the output shaft, and the swinging arms hinged joint crank connects the crank, and the connection crank is fixed at the feed shaft, and feed shaft dynamic connection feed dog frame is fixed with the feed dog on the feed dog frame.

Preferably, there is also a connecting rod, which hinges the crank.

Preferably, the sewing machine further comprises a thread trimming presser foot lifting drive source, the thread trimming presser foot lifting drive source is provided with a second output shaft, and when the thread trimming presser foot lifting drive source drives the presser foot lifting mechanism and the thread trimming mechanism to perform thread trimming and presser foot lifting actions through the second output shaft, the output shaft is in a static state.

Preferably, the swing rod adjusts the swing angle of the swing rod according to a certain preset angle of the control system, and the swing rod enables the feed dog to form a new needle pitch under the driving of the feed shaft driving source in a rotating mode, so that the needle pitch adjustment is realized.

Preferably, the feed shaft driving source drives the feed dog to be in a zero position without a back and forth feed motion, and the feed dog is located below a needle plate provided in the sewing machine.

Preferably, the sewing machine is further provided with a control system, the control system gives a new needle pitch to the cloth feeding shaft driving source to operate in a back and forth rotating mode, the cloth feeding shaft driving source is transmitted to the swinging rod through the output shaft to perform back and forth swinging motion, the swinging rod is transmitted to the cloth feeding teeth through the connecting crank, the cloth feeding shaft and the cloth feeding tooth rack, and the swinging rod reciprocates to swing back and forth on a central line of an angle when the cloth feeding teeth are relatively in a zero position on the output shaft.

Preferably, the control system is electrically connected with a cloth feeding shaft driving source and a thread cutting and presser foot lifting driving source of the sewing machine, the cloth feeding shaft driving source is installed on a side frame body of the sewing machine, the thread cutting and presser foot lifting driving source is installed below a base of the sewing machine, and the thread cutting and presser foot lifting driving source and the cloth feeding shaft driving source are stepping motors or servo motors.

Preferably, the sewing machine is used for executing the actions of trimming and presser foot lifting by the trimming and presser foot lifting driving source after the zero position is positioned, and the trimming mechanism is provided with a trimming crank, a trimming fork wheel and a trimming tail execution end; the presser foot lifting mechanism is provided with a presser foot lifting grooved pulley, a presser foot lifting ejector rod and a presser foot lifting tail end execution end, a thread cutting crank and the presser foot lifting grooved pulley are arranged on the second output shaft, the thread cutting crank is located at the front end of the thread cutting presser foot lifting drive source, and the presser foot lifting grooved pulley is located at the rear end of the thread cutting presser foot lifting drive source.

Preferably, a pushing piece is arranged at the eccentric position of the thread cutting crank, the thread cutting fork wheel is provided with a return rod and a thread cutting rod, the pushing piece is located between the return rod and the thread cutting rod, the thread cutting lifting and pressing foot driving source drives the pushing piece to rotate, lower the thread cutting rod and transmit the thread cutting rod to the thread cutting end execution end, the thread cutting lifting and pressing foot driving source reversely operates the pushing piece to loosen the thread cutting rod, and the return rod is returned to the original position along with the action to complete the reset of the whole thread cutting mechanism, so that the thread cutting action is completed.

Preferably, the presser foot lifting grooved pulley is provided with a front ejector rod abutting point, a rear ejector rod abutting point and a presser foot lifting highest point, the front ejector rod abutting point and the rear ejector rod abutting point are used for abutting against the presser foot lifting ejector rod, the front ejector rod abutting point and the rear ejector rod abutting point are provided with a groove in an arc shape, the presser foot lifting highest point is located at the highest point of the arc, the front ejector rod abutting point and the presser foot lifting highest point correspond to the fact that a trimming presser foot lifting driving source operates in a reverse direction to act on the return rod during trimming, one presser foot lifting action is completed on the presser foot lifting grooved pulley in a direct manner when the trimming presser foot lifting driving source resets the return rod, and the presser foot lifting ejector rod returns to the front ejector rod abutting point from the front ejector rod abutting point and can also return to the rear ejector rod abutting point.

The utility model provides a sewing machine does not set up swing seat, utilize feed shaft driving source drive swinging arms direct replacement swing seat's function, can implement the gauge needle to gauge needle adjustment mechanism and adjust, can also implement the action of location feed dog zero point position to zero position positioning mechanism, drive through the driving source and need not lubricate relevant spare part, the work efficiency of sewing machine is improved, utilize the trimming to lift the drive execution trimming of presser foot driving source and lift the presser foot action, the sewing machine of this application has apparent convenient assembling, the structure is retrencied more, saved swing seat and reduced the manufacturing degree of difficulty and cost simultaneously. The sewing machine breaks through the design concept of the traditional sewing machine and has higher popularization and use values.

Drawings

FIG. 1 is a schematic view of a sewing machine according to the present application;

FIG. 2 is a schematic view of a driving source of a feed shaft of a sewing machine according to the present application;

FIG. 3 is a schematic view of a presser foot lifting mechanism and a thread trimming mechanism of a sewing machine according to the present application;

FIG. 4 is a view of a lift and presser foot sheave of a sewing machine according to the present application;

fig. 5 is a structural view of a thread trimming mechanism of a sewing machine according to the present application.

Reference numerals: the cloth feeding device comprises a cloth feeding shaft driving source 10, an output shaft 11, a swing rod 12, a crank 121, a connecting rod 13, a connecting crank 14, a cloth feeding shaft 15, a cloth feeding tooth frame 16, a cloth feeding tooth 17, a needle plate 18, a trimming pressure lifting and pressing foot driving source 20, an output shaft II 21, a pressure lifting and pressing foot grooved wheel 31, a front ejector rod abutting point 311, a rear ejector rod abutting point 312, a pressure lifting and pressing foot highest point 313, a pressure lifting and pressing foot ejector rod 32, a trimming crank 41, a pushing piece 411, a trimming fork wheel 51, a return rod 511 and a trimming rod 512.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1-5, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be clearly and clearly defined, and these embodiments are only for illustrating the present invention and are not limited thereto.

In fig. 1 and 2, the sewing machine of the present application has a feed shaft drive source 10, a thread cutting presser foot lifting drive source 20, a zero position positioning mechanism, a stitch length adjusting mechanism, a presser foot lifting mechanism, a thread cutting mechanism, and a control system. The cloth feeding shaft driving source 10 is provided with an output shaft 11, and the cloth feeding shaft driving source 10 drives the zero position positioning mechanism and the needle pitch adjusting mechanism through the output shaft 11 at different times, so that the sewing machine is in zero position positioning and needle pitch adjusting actions. The thread trimming presser foot lifting driving source 20 is provided with a second output shaft 21, and the thread trimming presser foot lifting driving source 20 drives the presser foot lifting mechanism and the thread trimming mechanism through the second output shaft 21 at different time so as to realize the action of lifting and trimming the presser foot and the thread trimming of the sewing machine. The cloth feeding shaft driving source 10 and the thread cutting and presser foot lifting driving source 20 are electrically connected with a control system of the sewing machine, the cloth feeding shaft driving source 10 is installed on a side frame body of the sewing machine, and the thread cutting and presser foot lifting driving source 20 is installed below a base of the sewing machine.

The sewing machine is characterized in that the swinging seat is not arranged, and normal sewing work can be realized by the sewing machine under the technical scheme without the swinging seat. The needle pitch adjusting mechanism can be adjusted under the rotation driving of the cloth feeding shaft driving source 10; but also can position the zero position of the feed dog 17 to the zero position positioning mechanism; the stitch lifting and pressing motion of the stitch lifting mechanism and the stitch cutting motion of the stitch cutting mechanism are performed by the drive of the stitch lifting and pressing drive source 20.

The needle pitch adjusting mechanism of the sewing machine will be described with reference to the accompanying drawings. The needle pitch adjusting mechanism comprises a cloth feeding shaft driving source 10, a swing rod 12, a connecting rod 13, a connecting crank 14, a cloth feeding shaft 15, a cloth feeding tooth rack 16 and a cloth feeding tooth 17. The cloth feeding shaft driving source 10 is provided with an output shaft 11, a swing rod 12 is installed on the output shaft 11, and the cloth feeding shaft driving source 10 drives the swing rod 12 in a rotating mode, so that the swing rod 12 adjusts the swing angle of the swing rod 12 according to a certain preset angle of a control system, and the swing angle is adjusted to be larger or smaller. The oscillating rod 12 is hinged with a crank 14, the connecting crank 14 is fixed on a cloth feeding shaft 15, the cloth feeding shaft 15 is movably connected with a cloth feeding tooth rack 16, and a cloth feeding tooth 17 is fixed on the cloth feeding tooth rack 16. As another technical solution, a connecting rod 13 may be additionally provided between the swing rod 12 and the connecting crank 14, the swing rod 12 is hinged with the connecting rod 13, the connecting rod 13 is hinged with the crank 14, and the connecting crank 14 is fixed on the cloth feeding shaft 15, and the technical effects of the two solutions are the same with each other by the presence or absence of the connecting rod 13.

The feed shaft drive source 10 drives the swing lever 12 through the output shaft 11 to change the original position, and the change of the position affects the feed dog 17 through the connecting crank 14, the feed shaft 15 and the feed dog holder 16, so that the feed dog 17 forms a new needle pitch. In detail, the feed shaft driving source 10 changes the swing lever 12 from the original position to a new position under the control of the control system to form a new needle pitch, and the control system performs the new needle pitch at the time of sewing, so that the feed shaft driving source 10 realizes the needle pitch adjustment of the sewing machine by means of the swing lever 12 under the control of the control system. The utility model provides a sewing machine does not need the swing seat to adjust the gauge needle, has got rid of the tradition and has used swing seat technique, has improved the intelligent control level that the gauge needle was adjusted on the one hand, and on the other hand has reduced sewing machine's manufacturing cost by a wide margin, has higher technical expansibility.

In addition, the control system changes the position of the swing rod 12 arranged on the output shaft 11, the changed position is randomly large, the changed position determines the size of the needle pitch, the needle pitch completely falls into the operation corner of the cloth feeding shaft driving source 10, and the cloth feeding teeth 17 finally sew with the new needle pitch, so that one sewing machine can easily realize flexible adjustment of various needle pitches, and the technical defect that the original sewing machine only limits one needle pitch is overcome.

After the stitch length adjustment is completed, the sewing machine performs the sewing work with the new stitch length.

The control system gives a new needle pitch to the cloth feeding shaft driving source 10 to operate in a back and forth rotation mode, the cloth feeding shaft driving source 10 transmits the back and forth swinging motion to the swinging rod 12 through the output shaft 11, the swinging rod 12 transmits the back and forth swinging motion to the cloth feeding dog 17 through the connecting crank 14, the cloth feeding shaft 15 and the cloth feeding dog frame 16, or the swinging rod 12 transmits the back and forth cloth feeding motion to the cloth feeding dog 17 through the connecting rod 13, the connecting crank 14, the cloth feeding shaft 15 and the cloth feeding dog frame 16, and the cloth feeding dog 17 has the back and forth cloth feeding motion, and the back and forth cloth feeding motion and the tooth lifting motion transmitted by the lifting shaft of the sewing machine form the sewing and routing motion of the cloth feeding dog 17. Compared with the prior art, the cloth feeding shaft driving source 10 realizes the cloth feeding action of the cloth feeding shaft 15 to the cloth feeding teeth 17 in a reciprocating mode, and has the advantage of accurate cloth feeding.

Since the swing lever 12 to which the output shaft 11 is attached and fixed is intended to transmit a swing source, the same technical effects are obtained by using the crank 121.

The zero-position positioning mechanism of the sewing machine has the zero-position positioning function of the feed dog 17, the feed dog 17 is required to be in the zero-position without front and back feed actions by being driven by the feed shaft driving source 10, meanwhile, the feed dog 17 is positioned below the needle plate 18, the influence of the feed dog 17 higher than the needle plate 18 to sewing materials to be adversely sewed can be effectively avoided, the problem that the existing sewing machine is inaccurate in zero-position positioning is solved, the sewing machine can execute the presser foot lifting action and the thread trimming action on the zero-position of the feed dog 17, the sewing stability is improved, and the sewing quality is improved. When the sewing machine finishes sewing work and needs to perform presser foot lifting action and thread cutting action, the control system enables the feed dog 17 to be in a zero position state through the feed shaft driving source 10, and the feed dog 17 is relatively on a central line of a swinging angle by reciprocating the swinging rod 12 (or the connecting rod 13) when the feed dog is in the zero position state on the position of the swinging rod 12 (or the connecting rod 13) on the output shaft 11.

Referring to fig. 3, 4 and 5 of the drawings, the sewing machine of the present application is configured such that the thread cutting and presser foot lifting operation is performed by the thread cutting and presser foot lifting drive source 20 after the zero point position is located. The sewing machine further comprises a thread trimming and presser foot lifting drive source 20, a presser foot lifting mechanism and a thread trimming mechanism. When the sewing machine finishes sewing, the sewing machine needs to perform the actions of trimming and then lifting the presser foot to finish all sewing work. The thread trimming presser foot lifting drive source 20 and the feed shaft drive source 10 both have a presser foot lifting operation angle and a thread trimming operation angle, the thread trimming presser foot lifting drive source 20 performs a presser foot lifting operation within the presser foot lifting operation angle, and the thread trimming presser foot lifting drive source 20 performs a thread trimming operation within the thread trimming operation angle. When the thread cutting and presser foot raising drive source 20 performs the thread cutting operation and the presser foot raising operation, the feed shaft drive source 10 is stationary.

The thread cutting mechanism is provided with a thread cutting crank 41, a thread cutting fork wheel 51 and a thread cutting end execution end; the presser foot lifting mechanism comprises a presser foot lifting grooved pulley 31, a presser foot lifting ejector rod 32 and a presser foot lifting tail end execution end. The trimming crank 41 and the presser foot lifting sheave 31 are arranged on the second output shaft 21, the trimming crank 41 is positioned at the front end of the trimming presser foot lifting drive source 20, and the presser foot lifting sheave 31 is positioned at the rear end of the trimming presser foot lifting drive source 20.

The eccentric position of the thread cutting crank 41 is provided with a pushing piece 411, the thread cutting fork wheel 51 is provided with a return rod 511 and a thread cutting rod 512, the pushing piece 411 is positioned between the return rod 511 and the thread cutting rod 512, and the thread cutting lifting and pressing foot driving source 20 drives the pushing piece 411 to rotate the lower thread cutting rod 512 to transmit to the thread cutting end execution end so as to cut thread, so that the thread cutting action is completed by the thread cutting end execution end. After the trimming is finished, the trimming lifting presser foot driving source 20 reversely runs the pushing piece 411 to release the trimming rod 512, and the return rod 511 is returned to the original position to complete the resetting of the whole trimming mechanism, thereby completing the trimming action.

After the thread trimming is finished, the sewing machine immediately performs a presser foot lifting action. The trimming presser foot lifting driving source 20 drives the presser foot lifting sheave 31 at a presser foot lifting operation rotation angle. The presser foot lifting sheave 31 is provided with a front ejector rod abutting point 311, a rear ejector rod abutting point 312 and a presser foot lifting peak 313, the front ejector rod abutting point 311 and the rear ejector rod abutting point 312 are used for abutting against the presser foot lifting ejector rod 32, the front ejector rod abutting point 311 and the rear ejector rod abutting point 312 are arc-shaped grooves, and the presser foot lifting peak 313 is located at the peak of the arc. When the presser foot lifting push rod 32 drives the presser foot lifting grooved pulley 31 to lift from the front push rod abutting point 311 to the presser foot lifting highest point 313 under the driving of the trimming presser foot lifting driving source 20, the presser foot lifting push rod 32 causes the presser foot lifting tail end execution end to execute the presser foot lifting action, and the presser foot lifting action is executed when returning to the front push rod abutting point 311 from the presser foot lifting highest point 313. The above-mentioned front top rod abutting point 311 to the highest point 313 of the presser foot lifting corresponds to that the thread cutting presser foot lifting driving source 20 runs reversely and acts on the return rod 511 during the thread cutting action, in other words, after the thread cutting presser foot lifting driving source 20 cuts thread, the thread cutting presser foot lifting driving source 20 completes a presser foot lifting action on the presser foot lifting grooved pulley 31 in a proper manner when returning to the return rod 511.

After the presser foot raising operation is completed, the presser foot lift pin 32 may return from the front pin abutting point 311 to the front pin abutting point 311, or may return to the rear pin abutting point 312. The above-mentioned thread trimming presser foot drive source 20 and the feed shaft drive source 10 preferably use a stepping motor or a servo motor.

The above description is only one of the preferred embodiments of the present application, and not intended to limit the scope of the present application, and all modifications that can be made to the equivalent structure or equivalent flow path by using the shape, structure and principle of the present application and the accompanying drawings, or applied to other related fields directly or indirectly are included in the scope of the present application.

Claims (10)

1. A sewing machine is provided with a cloth feeding shaft driving source, a connecting crank, a cloth feeding shaft, a cloth feeding tooth rack and a cloth feeding tooth and is characterized by further comprising a swing rod, wherein the cloth feeding shaft driving source is provided with an output shaft, the output shaft is provided with the swing rod, the swing rod is hinged with the crank, the connecting crank is fixed on the cloth feeding shaft, the cloth feeding shaft is movably connected with the cloth feeding tooth rack, and the cloth feeding tooth is fixed on the cloth feeding tooth rack.

2. The sewing machine of claim 1, further comprising a connecting rod, wherein the oscillating rod articulates the connecting rod, and the connecting rod articulates the crank.

3. The sewing machine of claim 1, further comprising a thread cutting presser foot drive source, wherein the thread cutting presser foot drive source comprises a second output shaft, and when the thread cutting presser foot drive source drives the presser foot lifting mechanism and the thread cutting mechanism through the second output shaft to perform the thread cutting and presser foot lifting operations, the output shaft is in a stationary state.

4. The sewing machine of claim 1 or claim, wherein the swing lever is configured to adjust the swing angle of the swing lever by a predetermined amount of angle preset by the control system, and the swing lever is configured to adjust the stitch length by rotationally driving the feed dog by the feed shaft driving source.

5. The sewing machine of claim 1, wherein the feed shaft drive source drives the feed dog to a zero position without back and forth feed motion, the feed dog being below a needle plate provided in the sewing machine.

6. The sewing machine of claim 1, further comprising a control system, wherein the control system is configured to provide a new gauge to the feed shaft drive source to operate in a back and forth rotational manner, wherein the feed shaft drive source is transmitted to the oscillating rod through the output shaft to perform a back and forth oscillating motion, wherein the oscillating rod is transmitted to the feed dog through the connecting crank, the feed shaft and the feed dog holder, and wherein the feed dog is located on the output shaft at a position where the oscillating rod reciprocates relative to a centerline of the angle of the oscillating rod when the feed dog is in the zero position.

7. The sewing machine of claim 6, wherein the control system electrically connects a feed shaft drive source and a cut thread lift and press drive source of the sewing machine, the feed shaft drive source is mounted on a side frame of the sewing machine, the cut thread lift and press drive source is mounted under a base of the sewing machine, and the cut thread lift and press drive source and the feed shaft drive source are stepper motors or servo motors.

8. The sewing machine of claim 3, wherein the sewing machine is further configured to perform the thread cutting and the presser foot lifting actions by the thread cutting presser foot lifting drive source after the zero position is located, and the thread cutting mechanism comprises a thread cutting crank, a thread cutting fork wheel and a thread cutting end execution end; the presser foot lifting mechanism is provided with a presser foot lifting grooved pulley, a presser foot lifting ejector rod and a presser foot lifting tail end execution end, a thread cutting crank and the presser foot lifting grooved pulley are arranged on the second output shaft, the thread cutting crank is located at the front end of the thread cutting presser foot lifting drive source, and the presser foot lifting grooved pulley is located at the rear end of the thread cutting presser foot lifting drive source.

9. The sewing machine of claim 8, wherein the eccentric position of the thread cutting crank is provided with a pushing member, the thread cutting fork wheel is provided with a return rod and a thread cutting rod, the pushing member is positioned between the return rod and the thread cutting rod, the thread cutting lifting and pressing foot driving source drives the pushing member to rotate to press the thread cutting rod downwards to be transmitted to the thread cutting end execution end, the thread cutting lifting and pressing foot driving source reversely operates the pushing member to release the thread cutting rod, and the return rod is returned to the original position according to the situation so as to complete the reset of the whole thread cutting mechanism and complete the thread cutting action.

10. The sewing machine of claim 8, wherein the presser foot lifting sheave has a front top bar abutting point, a rear top bar abutting point and a presser foot lifting peak, the front top bar abutting point and the rear top bar abutting point are used for abutting against the presser foot lifting top bar, the front top bar abutting point and the rear top bar abutting point are in a groove in an arc shape, the presser foot lifting peak is located at the peak of the arc, the front top bar abutting point and the presser foot lifting peak correspond to the reverse operation of the thread cutting presser foot lifting driving source during thread cutting action and act on the return rod, the thread cutting presser foot lifting driving source completes a presser foot lifting action on the presser foot lifting sheave along with the trend when resetting the return rod, and the presser foot lifting top bar returns to the front top bar abutting point from the front top bar abutting point and also can return to the rear top bar abutting point.

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