Small needle plate quick-changing structure and sewing machine

Abstract

The utility model discloses a small needle plate quick-changing structure and a sewing machine, the small needle plate quick-changing structure comprises a needle plate fixing seat and a small needle plate, and a clamping pin and a clamping hole which are meshed with each other are arranged between the needle plate fixing seat and the small needle plate; the clamping hole comprises an inserting part and a limiting part; when the small needle plate is rotated relative to the needle plate fixing seat, the clamping pin enters the limiting part from the inserting part, and the limiting part is used for limiting the clamping pin to be separated from the clamping hole.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a small needle plate quick-change structure and a sewing machine. Background Art

[0002] There is a double-needle needle plate on the bar tacking machine, which includes a needle plate fixing seat and a small needle plate. The small needle plate is fixed on the needle plate fixing seat. When facing various sewing scenes such as denim, weaving, knitting, button sewing, etc., or when the small needle plate is punctured or pierced due to the bending of the machine needle, the small needle plate needs to be replaced to ensure the beautiful sewing stitches.

[0003] However, the existing small needle plate is fixed on the needle plate fixing seat by screws. When replacing the small needle plate, the screws need to be frequently disassembled and installed. The screws are small and replacement takes a long time. Utility Model Content

[0004] The utility model aims to provide a small needle plate quick-change structure and a sewing machine, which change the original screw connection into a bayonet connection, thereby solving the technical problem that the existing small needle plate replacement takes too long.

[0005] To achieve the above-mentioned purpose, the utility model provides a small needle plate quick-change structure, including a needle plate fixing seat and a small needle plate, wherein a mutually engaging snap-in pin and a snap-in hole are provided between the needle plate fixing seat and the small needle plate; the snap-in hole includes an insertion portion and a limiting portion; when the small needle plate is rotated relative to the needle plate fixing seat, the snap-in pin enters the limiting portion from the insertion portion, and the limiting portion is used to limit the snap-in pin from disengaging from the snap-in hole.

[0006] Preferably, a stop block is integrally formed at the end of the locking pin, and the cross-sectional area of ​​the stop block is between the cross-sectional area of ​​the limiting portion and the cross-sectional area of ​​the inserting portion.

[0007] Preferably, the minimum width of the socket portion is equal to the maximum width of the limiting portion; and the width of the limiting portion gradually decreases in a direction away from the insertion portion.

[0008] Preferably, a stepped groove is formed on the end surface of the limiting portion, and the stop block abuts against the stepped groove so that the end surface of the stop block is flush with the bottom end surface of the needle plate fixing seat.

[0009] Preferably, the bayonet pin sleeve is provided with an elastic member, two ends of the elastic member abut between the needle plate fixing seat and the small needle plate, and the elastic member is used to provide damping for the needle plate fixing seat and the small needle plate.

[0010] Preferably, the needle plate fixing seat is provided with a fixing groove for fixing the small needle plate, the fixing groove is a cylindrical groove, and the depth of the fixing groove is greater than or equal to the thickness of the small needle plate; the snap-in pin is fixed to the small needle plate, and the snap-in hole is provided at the bottom of the fixing groove; a sink groove is formed on the side of the snap-in hole facing the small needle plate, and the elastic member is installed in the sink groove.

[0011] Preferably, an avoidance gap is formed at the bottom of the fixing groove, and a clamping hole is respectively provided on both sides of the avoidance gap.

[0012] Preferably, the elastic member is a spring.

[0013] Preferably, the elastic member is an elastic pad.

[0014] The utility model also provides a sewing machine, comprising the small needle plate quick-change structure.

[0015] Compared with the background technology, the utility model optimizes the connection structure between the needle plate fixing seat and the small needle plate, and changes the original screw connection into a bayonet pin connection. When replacing the small needle plate, it is only necessary to rotate the small needle plate relative to the needle plate fixing seat, and the bayonet pin and bayonet hole provided between the needle plate fixing seat and the small needle plate can be separated. The small needle plate is more convenient to replace, and the replacement time of the small needle plate is effectively shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A front schematic diagram of a small needle plate quick-change structure provided by an embodiment of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the back side;

[0019] Figure 3 for Figure 2 A partial enlarged view of

[0020] Figure 4 for Figure 1 Exploded diagram of

[0021] Figure 5 for Figure 1 A cross-sectional view of

[0022] Figure 6 for Figure 1 Schematic diagram of the back of the small and medium needle board;

[0023] Figure 7 for Figure 1 Front view of the middle needle plate fixing seat;

[0024] Figure 8 for Figure 7 A partial enlarged view of

[0025] Fig. 9 for Figure 6 Schematic diagram of the back side;

[0026] Fig.10 for Fig. 9 A partial enlarged view of .

[0027] The reference numerals are as follows:

[0028] Needle plate fixing seat 1, small needle plate 2, clamping pin 3, clamping hole 4 and elastic member 5;

[0029] A fixing groove 11 and an avoidance notch 12;

[0030] Stop block 31;

[0031] Insertion portion 41, limiting portion 42 and sinking groove 43;

[0032] Step groove 421. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The utility model embodiment discloses a small needle plate quick change structure, as shown in the attached Figures 1 to 4 As shown, it includes a needle plate fixing seat 1 and a small needle plate 2. The needle plate fixing seat 1 and the small needle plate 2 are parallel, and the needle plate fixing seat 1 is used to support the small needle plate 2. Figures 4 to 7 As shown, a mutually engaged engaging pin 3 and an engaging hole 4 are provided between the needle plate fixing seat 1 and the small needle plate 2, and the engaging hole 4 includes an interlocking portion 41 and a limiting portion 42 that are interconnected. When installing the small needle plate 2, the engaging pin 3 is first inserted into the interlocking portion 41, and then the small needle plate 2 is rotated relative to the needle plate fixing seat 1, and the engaging pin 3 enters the limiting portion 42 from the interlocking portion 41, and the limiting portion 42 restricts the engaging pin 3 from being separated from the engaging hole 4, so that the small needle plate 2 is fixed on the needle plate fixing seat 1.

[0036] The utility model optimizes the connection structure between the needle plate fixing seat 1 and the small needle plate 2, and changes the original screw connection into a bayonet pin connection. When replacing the small needle plate 2, it is only necessary to rotate the small needle plate 2 relative to the needle plate fixing seat 1, and the bayonet pin 3 and the bayonet hole 4 provided between the needle plate fixing seat 1 and the small needle plate 2 can be separated. The small needle plate 2 is more convenient to replace, and the replacement time of the small needle plate 2 is effectively shortened.

[0037] As attached Figure 5 and 6 As shown, a stop block 31 is integrally formed at the end of the locking pin 3, and the cross-sectional area of ​​the stop block 31 is between the cross-sectional area of ​​the limiting portion 42 and the cross-sectional area of ​​the insertion portion 41, so that the stop block 31 can pass through the insertion portion 41 but cannot pass through the limiting portion 42, so that the stop block 31 and the end surface of the limiting portion 42 abut against each other to form a stop, thereby limiting the small needle plate 2 from detaching from the needle plate fixing seat 1.

[0038] As attached Figures 8 to 10 As shown, the clamping hole 4 is a long hole with varying width. The insertion portion 41 is a circular arc hole, and its arc length is close to three-quarters of a circular arc. The limiting portion 42 is composed of a square hole and a semicircular hole, and the width of the square hole is greater than the diameter of the semicircular hole. The minimum width of the insertion portion 41 is equal to the maximum width of the limiting portion 42, that is, the minimum width of the circular arc hole is equal to the width of the square hole. In the direction away from the insertion portion 41, the width of the limiting portion 42 gradually decreases, making it easier for the clamping hole 4 to clamp the clamping pin 3.

[0039] The stopper block 31 is coaxially connected to the pin body of the clamping pin 3 in an integral manner. The stopper block 31 is in the shape of a disk, and the pin body is in the shape of a cylinder. The diameter of the pin body is smaller than the diameter of the stopper block 31. The diameter of the stopper block 31 is equal to the diameter of the arc hole of the insertion portion 41, but larger than the diameter of the semicircular hole of the limiting portion 42; the diameter of the pin body is smaller than the width of the square hole, but equal to the diameter of the semicircular hole.

[0040] A stepped groove 421 is formed on the end face of the limiting portion 42. When the engaging pin 3 enters the limiting portion 42 of the engaging hole 4, the stop block 31 abuts against the stepped groove 421, so that the end face of the stop block 31 is flush with the bottom end face of the needle plate fixing seat 1, thereby preventing the engaging pin 3 from protruding out of the needle plate fixing seat 1 and causing interference.

[0041] The clamping pin 3 is sleeved with an elastic member 5, and the two ends of the elastic member 5 abut between the needle plate fixing seat 1 and the small needle plate 2. The elastic member 5 provides damping for the needle plate fixing seat 1 and the small needle plate 2 by its own elastic force, so that a certain pre-pressure is maintained between the small needle plate 2 and the needle plate fixing seat 1, and the small needle plate 2 is restricted from rotating freely relative to the needle plate fixing seat 1, so as to prevent the small needle plate 2 from accidentally detaching from the needle plate fixing seat 1, and ensure that the small needle plate 2 is reliably fixed on the needle plate fixing seat 1. The elastic member 5 can be a spring or an elastic pad, but is not limited thereto.

[0042] The needle plate fixing seat 1 is provided with a fixing groove 11, and the small needle plate 2 is coaxially fixed in the fixing groove 11. The fixing groove 11 is a cylindrical groove, and the small needle plate 2 is disc-shaped. The diameter of the fixing groove 11 is greater than or equal to the diameter of the small needle plate 2, and the depth of the fixing groove 11 is greater than or equal to the thickness of the small needle plate 2, so that the small needle plate 2 is completely sunken in the fixing groove 11, and the small needle plate 2 is prevented from protruding out of the needle plate fixing seat 1 and causing interference.

[0043] The clamping pin 3 is fixedly arranged on the small needle plate 2, and the clamping hole 4 is arranged at the groove bottom of the fixed groove 11. Of course, the setting positions of the clamping pin 3 and the clamping hole 4 are interchanged, and the purpose of the utility model is not affected.

[0044] A sinking groove 43 is formed on one side of the clamping hole 4 facing the small needle plate 2, and the elastic member 5 is installed in the sinking groove 43. The setting of the sinking groove 43 provides space for the elastic member 5 to expand and contract, so as to prevent the small needle plate 2 from being pushed out of the fixing groove 11 by the elastic member 5. The sinking groove 43 can be a waist-shaped groove, which provides space for the elastic member 5 to move with the small needle plate 2.

[0045] An avoidance notch 12 is formed at the bottom of the fixing groove 11, and a clamping hole 4 is respectively provided on both sides of the avoidance notch 12 to ensure that the small needle plate 2 is evenly stressed and avoid the small needle plate 2 from being stuck due to uneven stress.

[0046] The utility model also discloses a sewing machine, which comprises the small needle plate quick-change structure and has the same beneficial effects.

[0047] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0048] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A small needle plate quick-change structure, characterized in that: The invention comprises a needle plate fixing seat (1) and a small needle plate (2); a mutually engaging engaging pin (3) and an engaging hole (4) are provided between the needle plate fixing seat (1) and the small needle plate (2); the engaging hole (4) comprises an inserting portion (41) and a limiting portion (42); when the small needle plate (2) is rotated relative to the needle plate fixing seat (1), the engaging pin (3) enters the limiting portion (42) from the inserting portion (41), and the limiting portion (42) is used to limit the engaging pin (3) from being separated from the engaging hole (4).

2. The small needle plate quick-change structure according to claim 1 is characterized in that: A stop block (31) is integrally formed at the end of the locking pin (3), and the cross-sectional area of ​​the stop block (31) is between the cross-sectional area of ​​the limiting portion (42) and the cross-sectional area of ​​the insertion portion (41).

3. The small needle plate quick-change structure according to claim 2 is characterized in that: The minimum width of the insertion portion (41) is equal to the maximum width of the limiting portion (42); and in a direction away from the insertion portion (41), the width of the limiting portion (42) gradually decreases.

4. The small needle plate quick-change structure according to claim 2 is characterized in that: The end surface of the limiting portion (42) is formed with a stepped groove (421), and the stop block (31) abuts against the stepped groove (421) so that the end surface of the stop block (31) is flush with the bottom end surface of the needle plate fixing seat (1).

5. The small needle plate quick-change structure according to any one of claims 1 to 4, characterized in that: The locking pin (3) is sleeved with an elastic member (5), the two ends of the elastic member (5) are abutted between the needle plate fixing seat (1) and the small needle plate (2), and the elastic member (5) is used to provide damping for the needle plate fixing seat (1) and the small needle plate (2).

6. The small needle plate quick-change structure according to claim 5, characterized in that: The needle plate fixing seat (1) is provided with a fixing groove (11) for fixing the small needle plate (2), the fixing groove (11) is a cylindrical groove, and the depth of the fixing groove (11) is greater than or equal to the thickness of the small needle plate (2); the locking pin (3) is fixed to the small needle plate (2), and the locking hole (4) is arranged at the bottom of the fixing groove (11); the locking hole (4) is formed with a sink groove (43) on one side of the locking hole (4) facing the small needle plate (2), and the elastic member (5) is installed in the sink groove (43).

7. The small needle plate quick-change structure according to claim 6, characterized in that: The bottom of the fixing groove (11) is formed with an escape notch (12), and one of the clamping holes (4) is provided on each side of the escape notch (12).

8. The small needle plate quick-change structure according to claim 5, characterized in that: The elastic member (5) is a spring.

9. The small needle plate quick-change structure according to claim 5, characterized in that: The elastic member (5) is an elastic pad.

10. A sewing machine, characterized in that: It comprises the small needle plate quick-change structure as described in any one of claims 1 to 9.

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