CN109680421B

CN109680421B - Sewing machine capable of switching back sewing

Info

Publication number: CN109680421B
Application number: CN201910058391.5A
Authority: CN
Inventors: 何明金; 祝书伟
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2019-01-22
Filing date: 2019-01-22
Publication date: 2021-07-30
Anticipated expiration: 2039-01-22
Also published as: CN109680421A

Abstract

The invention discloses a sewing machine for switching backstitch, which comprises: switch the seat, the slider, first connecting rod, the second connecting rod, the eccentric wheel, the crank, first pay-off axle, second pay-off axle and drive arrangement, switch on the base plate of seat hinge joint on the sewing machine, drive arrangement is used for the drive to switch the seat and rotates, be equipped with the spout on the seat of switching, the extending direction of spout and the rotation center line mutually perpendicular who switches the seat, slider sliding connection is in the spout, the both ends of first connecting rod are articulated with slider and articulate one end respectively, the articulate other end and first pay-off axle fixed connection, the both ends of second connecting rod are articulated with slider and eccentric wheel respectively, the eccentric wheel is fixed on the second pay-off axle, the pot head that is equipped with the eccentric wheel on the second pay-off axle is established in the one end of first pay-off axle. The mutual separation of the stitch length adjusting part and the automatic backstitch can be realized through the switching seat, the collision between the adjuster and the stud during the automatic backstitch is eliminated, the noise is eliminated, and the service life of corresponding parts is prolonged.

Description

Sewing machine capable of switching back sewing

Technical Field

The invention relates to the technical field of sewing machines, in particular to a sewing machine with reversing sewing switching.

Background

The existing sewing machine is characterized in that in order to ensure the correspondence between the backstitch stitch length and the main stitch length, the stitch length adjusting function and the automatic backstitch function are realized by adjusting the angle of the swing seat (namely, the adjustment of the backstitch stitch length is also considered while the main stitch length is adjusted), and due to the limitation of the mechanism, the automatic backstitch switching mechanism can generate larger noise, and the conditions of serious part abrasion and stitch length distortion can occur after long-time use.

In the existing sewing machine, a needle pitch adjusting part drives a feeding stud to feed in the front and back directions by rotating a needle pitch dial to adjust the angle of a swinging seat, so that the change of the needle pitch is realized; the automatic backstitch part drives the automatic backstitch rod group to drive the swing seat to swing to a certain angle through the automatic backstitch electromagnet to realize backstitch, and the limitation of backstitch needle distance is realized by the collision of the working arc surface of the regulator and the head of the feeding stud, so that the contact part of the stud and the feeding regulator is severely abraded after long-time use, and noise is brought when the front backstitch is switched.

Therefore, how to provide a sewing machine with reversed sewing switching to avoid the mutual collision of parts and noise, and further improve the service life of the parts and the use experience effect of a user is a technical problem to be solved by technical personnel in the field.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a sewing machine with a reverse sewing switch, which can effectively eliminate the noise generated by the collision of the components, thereby improving the service life of the components.

In order to achieve the purpose, the invention provides the following technical scheme:

a backstitch switching sewing machine comprising: the switching seat is hinged to a bottom plate on the sewing machine, the driving device is used for driving the switching seat to rotate, a sliding groove is formed in the switching seat, the extending direction of the sliding groove is perpendicular to the rotating central line of the switching seat, the sliding block is connected in the sliding groove in a sliding mode, two ends of the first connecting rod are hinged to one end of the sliding block and one end of the crank respectively, the other end of the crank is fixedly connected with the first feeding shaft, two ends of the second connecting rod are hinged to the sliding block and the eccentric wheel respectively, the eccentric wheel is fixed to the second feeding shaft, and one end, provided with the eccentric wheel, of the second feeding shaft is sleeved at one end of the first feeding shaft.

Preferably, the slider includes first slider and second slider, the spout include with first slider mutually supported first spout and with second slider mutually supported second spout, be equipped with the recess on the switching seat, be equipped with respectively on the relative lateral wall in the recess first spout with the second spout, first slider with the second slider passes through round pin axle fixed connection, first connecting rod with the second connecting rod all with the round pin axle is articulated.

Preferably, the driving device comprises a backstitch electromagnet and a pull rod, and the backstitch electromagnet is used for pulling the switching seat to rotate through the pull rod.

Preferably, the switching seat is of a cylindrical structure, and two ends of the switching seat are provided with pins for hinging.

Preferably, one end of the pull rod is hinged with a pin at one end of the switching seat.

Preferably, the manual backstitch assembly is used for controlling the angle of the swing seat, and further controlling the swing angle of the second feeding shaft.

Preferably, the swing seat further comprises a stud and an adjuster, and the adjuster is pushed to swing by screwing the stud, so that the rotation angle of the swing seat is adjusted.

Compared with the prior art, the technical scheme has the following advantages:

the invention provides a sewing machine for switching backstitch, which comprises: switch the seat, the slider, first connecting rod, the second connecting rod, the eccentric wheel, the crank, first pay-off axle, second pay-off axle and drive arrangement, switch on the base plate of seat hinge joint on the sewing machine, drive arrangement is used for the drive to switch the seat and rotates, be equipped with the spout on the seat of switching, the extending direction of spout and the rotation center line mutually perpendicular who switches the seat, slider sliding connection is in the spout, the both ends of first connecting rod are articulated with slider and articulate one end respectively, the articulate other end and first pay-off axle fixed connection, the both ends of second connecting rod are articulated with slider and eccentric wheel respectively, the eccentric wheel is fixed on the second pay-off axle, the pot head that is equipped with the eccentric wheel on the second pay-off axle is established in the one end of first pay-off axle. Through the rotation function of the switching seat, the mutual separation of the needle pitch adjusting part and the automatic backstitch can be realized, the noise during the automatic backstitch is eliminated, the collision between the regulator and the stud during the automatic backstitch is eliminated, and the service life of corresponding parts is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view of a reverse stitching switching sewing machine according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the switching architecture of FIG. 1;

FIG. 3 is a schematic view of a slider moving in a normal state of a reverse sewing machine according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating a movement structure of a slider in a backstitch state of the sewing machine with backstitch switching according to an embodiment of the present invention.

The reference numbers are as follows:

the device comprises a switching seat 1, a sliding block 2, a first connecting rod 3, a second connecting rod 4, an eccentric wheel 5, a crank 6, a first feeding shaft 7, a second feeding shaft 8, a pin 9, a pull rod 10, a backstitch electromagnet 11, a feeding crank 12, a swinging seat 13, an adjuster 14, a stud 15, a main shaft 16, a backstitch wrench 17 and a cushion 18.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a reverse seam switching sewing machine according to an embodiment of the present invention; fig. 2 is a schematic diagram of the switching structure in fig. 1.

The sewing machine that an embodiment of the invention provides switches over the backstitch, including: the switching seat 1, the sliding block 2, the first connecting rod 3, the second connecting rod 4, the eccentric wheel 5, the crank 6, the first feeding shaft 7, the second feeding shaft 8 and the driving device, the switching seat 1 is hinged on a bottom plate of the sewing machine, the driving device is used for driving the switching seat 1 to rotate, the switching seat 1 is provided with a sliding chute, the extending direction of the sliding chute is vertical to the rotating central line of the switching seat 1, the sliding block 2 is connected in the sliding chute in a sliding way, the two ends of the first connecting rod 3 are respectively hinged with one end of the sliding block 2 and one end of the crank 6, the other end of the crank 6 is fixedly connected with the first feeding shaft 7, the two ends of the second connecting rod 4 are respectively hinged with the sliding block 2 and the eccentric wheel 5, the eccentric wheel 5 is fixed on the second feeding shaft 8, one end of the eccentric wheel 5 arranged on the second feeding shaft 8 is sleeved at one end of the first feeding shaft 7, and the other end of the second feeding shaft 8 is fixedly connected with the feeding crank 12 of the needle distance adjusting part.

In this embodiment, for convenience of understanding, as shown in fig. 3 and 4, the switching seat 1 is simplified to EF, the slider 2 is C, the first connecting rod 3 is CD, the second connecting rod 4 is BC, the eccentric wheel 5 is AB, and the crank 6 is AD, during normal sewing, the switching seat 1 is locked at a preset angle Φ 3, the rotation angles of the eccentric wheel 5 and the crank 6 are the same, when backstitch is required, the driving device drives the switching seat 1 to rotate to another preset angle Φ 4, and the rotation angles of the eccentric wheel 5 and the crank 6 are opposite, that is, the reversing function of the first feeding shaft 7 can be realized by the rotation of the switching seat 1, wherein Φ 3 and Φ 4 are not changed under different needle pitches, so that the requirement that the working stroke of the backstitch electromagnet is not changed during forward and backstitch switching can be ensured. Importantly, the mutual separation of the stitch length adjusting part and the automatic backstitch can be realized by switching the rotating function of the seat 1, the noise during the automatic backstitch is eliminated, the collision between the regulator 14 and the stud 15 during the automatic backstitch is eliminated, and the service life of corresponding parts is prolonged.

Specifically, slider 2 includes first slider 2 and second slider 2, and the spout includes the first spout of mutually supporting with first slider 2 and the second spout of mutually supporting with second slider 2, switches and is equipped with the recess on the seat 1, is equipped with first spout and second spout on the relative lateral wall in the recess respectively, and first slider 2 and second slider 2 are through round pin axle fixed connection, and first connecting rod 3 and second connecting rod 4 all articulate with the round pin axle. In specific working process, the main shaft 16 rotates to drive the second feeding shaft 8 to rotate, and then drives the first feeding shaft 7 to rotate through the switching seat 1, wherein the stability of power transmission of the switching seat 1 is improved through the first sliding block 2 and the second sliding block 2.

Specifically, the driving device comprises a backstitch electromagnet 11 and a pull rod 10, and the backstitch electromagnet 11 is used for pulling the switching seat 1 to rotate through the pull rod 10. Wherein can set up blotter 18 on the iron core of backstitch electro-magnet 11, blotter 18 is located the outside of backstitch electro-magnet 11, when backstitch electro-magnet during operation, the iron core moves along backstitch electro-magnet inner chamber, the blotter 18 of setting on the iron core also can move along with the iron core, reach limiting displacement when blotter 18 and the contact of backstitch electro-magnet 11 outer wall, wherein blotter 18 can be elastomeric element such as rubber pad, in order to reach the mesh of amortization, the spacing of just backstitch can be restricted by the blotter, and the collision of regulator 14 and double-screw bolt 15 accomplishes spacingly in the non-original structure, consequently, the noise abatement.

Wherein the switching base 1 is preferably of a cylindrical structure, and both ends of the switching base 1 are provided with pins 9 for hinging. Through will switching the both ends of seat 1 and articulate, be favorable to improving the stability when switching seat 1 rotates the switching.

In particular, one end of the pull rod 10 is hinged to a pin 9 at one end of the switching seat 1. Namely, the backstitch electromagnet 11 drives the pin 9 to rotate through the pull rod 10, so that the switching seat 1 realizes the steering function.

In order to improve the applicability of the sewing machine provided by the above embodiment, in this embodiment, the sewing machine further includes a manual backstitch assembly and a swing seat 13, and the manual backstitch assembly is used for controlling the angle of the swing seat 13, and further controlling the swing angle of the second feeding shaft 8. Manual control backstitch spanner 17 will swing seat 13 and transfer to certain angle, and 8 phase angles of second feeding shaft will change this moment, can drive first feeding shaft 7 phase angles simultaneously and change, can manually realize the backstitch, through keeping manual backstitch function, be favorable to keeping user's use habit, and prior art can be referred to the concrete structure and the theory of operation of relevant manual backstitch subassembly in addition, and this place is no longer repeated.

Further, the needle pitch adjusting mechanism comprises a stud 15 and an adjuster 14, the adjuster 14 is pushed to swing by screwing the stud 15, and then the rotating angle of the swing seat 13 is adjusted, so that the swing angle transmitted from the revolving motion of the main shaft to the swing of the second feeding shaft 8 is changed, the swing angle of the second feeding shaft 8 serving as an input and transmitting the motion to the first feeding shaft 7 through the switching seat 1 and other components is also changed, and finally the needle pitch is changed. The detailed structure and operation principle of the stud 15 and the adjuster 14 can be referred to the prior art, and will not be described herein.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The sewing machine for switching the backstitch provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A backstitch switching sewing machine, comprising: the sewing machine comprises a switching seat, a sliding block, a first connecting rod, a second connecting rod, an eccentric wheel, a crank, a first feeding shaft, a second feeding shaft and a driving device, wherein the switching seat is hinged to a bottom plate on the sewing machine, the driving device is used for driving the switching seat to rotate, a sliding groove is formed in the switching seat, the extending direction of the sliding groove is perpendicular to the rotating central line of the switching seat, the sliding block is connected in the sliding groove in a sliding mode, two ends of the first connecting rod are hinged to the sliding block and one end of the crank respectively, the other end of the crank is fixedly connected with the first feeding shaft, two ends of the second connecting rod are hinged to the sliding block and the eccentric wheel respectively, the eccentric wheel is fixed on the second feeding shaft, one end of the eccentric wheel, which is arranged on the second feeding shaft, is sleeved on one end of the first feeding shaft, and the driving device comprises a backstitch electromagnet and a pull rod, the backward joint electromagnet is used for pulling the switching seat to rotate through the pull rod, a buffer pad is arranged on an iron core of the backward joint electromagnet and located outside the backward joint electromagnet, and the buffer pad and the outer wall of the backward joint electromagnet are in contact to play a limiting role.

2. The machine according to claim 1, wherein the slider comprises a first slider and a second slider, the sliding grooves comprise a first sliding groove and a second sliding groove, the first sliding groove and the second sliding groove are matched with each other, the switching seat is provided with a groove, the first sliding groove and the second sliding groove are respectively arranged on opposite side walls in the groove, the first slider and the second slider are fixedly connected through a pin, and the first connecting rod and the second connecting rod are both hinged to the pin.

3. The backstitch switching sewing machine of claim 1, wherein the switching base is a cylindrical structure, and a pin for hinge joint is provided at both ends of the switching base.

4. The reverse stitching switching sewing machine of claim 3 wherein one end of the pull rod is hinged to a pin at one end of the switch base.

5. The backstitch switching sewing machine according to any one of claims 1 to 4, further comprising a manual backstitch assembly and a swing seat, wherein the manual backstitch assembly is used for controlling an angle of the swing seat, and further controlling a swing angle of the second feeding shaft.

6. The machine according to claim 5, further comprising a stud and an adjuster, wherein the adjuster is driven to swing by screwing the stud, thereby adjusting the rotation angle of the swing seat.