Cloth cutting device of sewing machine

Abstract

The utility model provides a cloth cutting device of a sewing machine, which comprises a casing, a cutter and a corresponding cutter holder, and further comprises a cutter swing rod component capable of driving the cutter to cut cloth and a driving component for driving the cutter swing rod component to act, and the driving component comprises a transmission shaft and a driving connecting rod component for driving the transmission shaft to rotate. The cutter swing rod assembly comprises a driving crank with one end arranged on the transmission shaft and a driving swing rod with one end sliding on the driving crank, and further comprises a switching structure for driving the driving swing rod to slide on the driving crank so as to switch a non-driving state and a driving state, the sewing state or the state of cutting cloth while sewing can be rapidly switched, and operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a cloth cutting device of a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so as to interweave or stitch together one or more layers of sewing materials.

[0003] At present, there are sewing machines with cloth cutting devices on the market, which can cut the cloth while sewing. However, this kind of cloth cutting mechanism cannot switch modes (such as only sewing and sewing while cutting the cloth) or the switching is relatively troublesome. Summary of the Invention

[0004] In order to solve the above problems of the prior art, the utility model provides a cloth cutting device of a sewing machine, which can quickly switch between the states of cutting the cloth and not cutting the cloth, and is simple to operate.

[0005] The technical scheme adopted is as follows:

[0006] A cloth cutting device of a sewing machine includes a machine shell, a cutting knife and a corresponding cutting knife seat, and further includes a cutting knife swing rod assembly for driving the cutting knife to cut the cloth and a driving assembly for driving the cutting knife swing rod assembly to act. The driving assembly includes a transmission shaft and a driving link assembly for driving the transmission shaft to rotate. The cutting knife swing rod assembly includes a driving crank with one end arranged on the transmission shaft and a driving swing rod with one end sliding on the driving crank. It also includes a switching structure for driving the driving swing rod to slide on the driving crank to switch between the non-driving state and the driving state. When the driving swing rod is in the non-driving state, the corresponding end of the driving swing rod is located at the end where the driving crank is connected to the transmission shaft, and the round handle at the connection of the driving swing rod is coaxial with the transmission shaft; when the driving swing rod is in the driving state, the driving swing rod is located at the other end of the driving crank.

[0007] Further, the driving link assembly includes a driving cam, a driving arm with one end arranged on the driving cam, and a connecting rod connecting the other end of the driving arm and the transmission shaft.

[0008] Further, the switching structure includes a driving cylinder, a switching crank, and a first connecting rod connecting the switching crank and the cylinder joint. One end of the switching crank is connected to the first connecting rod, the other end is connected to the driving swing rod through a second connecting rod, and the middle part is rotatably connected to the rotating shaft.

[0009] Further, a sliding groove and a sliding block matched with the sliding groove are arranged on the driving crank, and one end of the driving swing rod is rotatably connected to the sliding block.

[0010] Further, stop pins for blocking the sliding block are arranged at both ends of the driving crank.

[0011] Further, the cutter swing rod assembly further includes a transmission connecting rod and a connecting link. One end of the transmission connecting rod is connected to the driving swing rod, the other end is connected to the connecting link, and the middle part is rotatably arranged on the machine shell.

[0012] Further, one end of the connecting link is connected to the transmission connecting rod, and the other end is arranged on the cutter seat.

[0013] Further, a cutter guide sleeve for the cutter seat to slide up and down is arranged on the machine shell, and a guide groove cooperating with the cutter guide sleeve is arranged on the cutter seat.

[0014] Further, a button for controlling the cylinder solenoid valve is arranged on the machine shell.

[0015] Further, the transmission shaft and the rotating shaft are both arranged on the machine shell.

[0016] Compared with the prior art, the beneficial effects produced by the present utility model are as follows:

[0017] The present utility model provides a cloth cutting device for a sewing machine, including a cutter swing rod assembly, a driving assembly and a switching structure. The driving assembly includes a transmission shaft, and the cutter swing rod assembly is driven to act by driving the transmission shaft to rotate, so as to drive the cutter to cut the cloth. The cutter swing rod assembly includes a driving crank and a driving swing rod. One end of the driving crank is arranged on the transmission shaft, and the rotation of the transmission shaft can drive the driving crank to swing.

[0018] One end of the driving swing rod is slidably arranged on the driving crank. When the driving swing rod slides to the position where the set round handle is coaxial with the transmission shaft, the transmission shaft rotation has no driving force on the driving swing rod, and at this time, it is in a non-driving state, and the sewing machine only sews; when the driving swing rod slides towards the other end of the driving crank and forms a connecting rod assembly with the driving crank, the rotation of the transmission shaft will drive the driving swing rod to swing and drive the cutter to cut the cloth. At this time, it is in a driving state, and cloth can be cut while sewing. The switching structure can quickly switch the driving state of the driving swing rod by driving the driving swing rod to slide, realizing two states of sewing alone and cutting cloth while sewing, and the switching operation is simple. It is driven by a cylinder, and pressing the button for controlling the cylinder can complete the switching. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0020] Figure 2 It is a front view schematic diagram in the non-driving state;

[0021] Figure 3 It is a front view schematic diagram in the driving state;

[0022] Figure 4 It is a partial structure schematic diagram in the non-driving state;

[0023] Figure 5For Figure 4 An enlarged view of position a;

[0024] Figure 6 A partial structural schematic diagram in the driving state;

[0025] Figure 7 A schematic diagram of the back side of the present utility model;

[0026] Wherein, the cutting knife 1, the cutting knife seat 2, the cutting knife swing rod assembly 3, the driving crank 301, the driving swing rod 302, the transmission connecting rod 303, the connecting connecting rod 304, the driving assembly 4, the transmission shaft 401, the connecting rod assembly 402, the driving cam 4021, the driving arm 4022, the connecting rod 4023, the switching structure 5, the driving cylinder 501, the switching crank 502, the first connecting rod 503, the second connecting rod 504, the sliding groove 6, the slider 7, the machine shell 8, the cutting knife guide sleeve 9, the guide groove 10, the rotating shaft 11, the button 12. Specific embodiments

[0027] The following further describes the present utility model in conjunction with specific embodiments.

[0028] Refer to Figures 1-7 , a cloth cutting device of a sewing machine, comprising a machine shell 8, a cutting knife 1 and a corresponding cutting knife seat 2, further comprising a cutting knife swing rod assembly 3 capable of driving the cutting knife 1 to cut the cloth and a driving assembly 4 for driving the cutting knife swing rod assembly to act. The driving assembly 4 comprises a transmission shaft 401 and a driving connecting rod assembly 402 for driving the transmission shaft 401 to rotate. The cutting knife swing rod assembly 3 comprises a driving crank 301 and a driving swing rod 302 with one end sliding on the driving crank 301. One end of the driving crank 301 is connected to the transmission shaft 401. It further comprises a switching structure 5 for driving the driving swing rod to slide on the driving crank to switch between the non-driving state and the driving state. When the driving swing rod 302 is in the non-driving state, the corresponding end of the driving swing rod 302 moves to the end where the driving crank 301 is connected to the transmission shaft 401, and the round handle 14 at the connection of the driving swing rod is coaxial with the transmission shaft 401; when the driving swing rod is in the driving state, the driving swing rod is located at the other end of the driving crank. The non-driving state refers to the state when the driving swing rod does not swing; the driving state refers to the state when the cutting knife swing rod drives the cutting knife to cut the cloth.

[0029] The driving connecting rod assembly 402 comprises a driving cam 4021, a driving arm 4022 with one end arranged on the driving cam 4021, and a connecting rod 4023 connecting the other end of the driving arm and the transmission shaft. The driving cam 4021 is arranged on a driving shaft (not shown in the figure), and this driving shaft also drives the needle bar. When the driving shaft rotates, the driving arm 4022 swings, and drives the transmission shaft 401 to rotate through the transmission of the connecting rod 4023. Sharing a driving shaft with the needle bar, there is no need to separately provide a driving mechanism for cloth cutting, saving space and cost, and ensuring that cloth cutting is synchronized with feeding and the needle bar.

[0030] The described switching structure 5 includes a driving cylinder 501 (other drivers can also be used), a switching crank 502, and a first connecting rod 503 connecting the switching crank 502 and the cylinder joint. One end of the switching crank 502 is connected to the first connecting rod 503, and the other end is connected to the driving swing rod 302 through a second connecting rod 504. The middle part is rotatably connected to the rotating shaft 11. The cylinder 501 drives the first connecting rod 503 to move, driving the switching crank 502 to swing. The switching crank 502 drives the driving swing rod 302 to slide on the driving crank through the second connecting rod 504.

[0031] The driving crank 301 is provided with a sliding groove 6 and a slider 7 that cooperates with the sliding groove 6. One end of the driving swing rod 302 is rotatably connected to the slider 7. The slider slides in the sliding groove, driving the driving swing rod to slide together. The slider 7 is provided with a round shaft for installing the driving swing rod 302, and the round handle 14 provided on the driving swing rod is sleeved outside the round shaft and is rotatably connected to the round shaft. Both ends of the driving crank 301 are provided with retaining pins 13 for blocking the slider 7. The retaining pins 13 are provided to prevent the slider 7 from disengaging from the driving crank 301, determining two states of the driving swing rod, the non-driven state and the driven state.

[0032] When the driving swing rod 302 is in the non-driven state, the round handle 14 of the driving swing rod 302 is coaxial with the transmission shaft 401. When the transmission shaft 401 rotates, the driving crank 301 swings, but the driving swing rod 302 is in the non-driven state and will not swing accordingly. The driving swing rod 302 does not drive the cutter to cut the cloth. Therefore, when the driving shaft rotates, it can only drive the needle bar to move, and the cutter does not perform the cloth cutting action, being in the state of single sewing.

[0033] When the driving swing rod 302 is in the driven state, the driving swing rod 301 moves to the other end of the driving crank 301. When the transmission shaft 401 rotates, the swing of the driving crank 301 will drive the driving swing rod 302 to swing and drive the cutter to move up and down to cut the cloth. At this time, the driving swing rod and the driving crank form a connecting rod structure. The driving crank has a driving force on the driving swing rod, and the driving swing rod 301 can drive the cutter to cut the cloth, being in the state of sewing and cutting the cloth at the same time.

[0034] In this embodiment, as Figure 2 、 4 , when the cylinder drives the first connecting rod 503 to extend and the driving swing rod moves to the non-driven state, the switching structure 5 drives the driving swing rod to slide and also drives the driving swing rod 302 to swing when driving the driving swing rod to slide, so that the driving swing rod 302 drives the cutter seat to move upward. When the driving swing rod 302 moves to the non-driven state, the cutter seat 2 just moves to the highest point. At this time, the cutter is in the non-driven state. As Figure 3 、 6, the air cylinder drives the first connecting rod 503 to retract, causing the driving swing rod to move to the driving state. While the switching structure 5 drives the driving swing rod to slide, it also drives the driving swing rod 302 to swing, causing the driving swing rod 302 to drive the cutter holder to move downward. At this time, the cutter is in the driving state and can be driven by the driving component 4 to cut the cloth.

[0035] The cutter swing rod assembly 3 further includes a transmission connecting rod 303 and a connecting link 304. One end of the transmission connecting rod 303 is connected to the driving swing rod 302, the other end is connected to the connecting link 304, and the middle is rotatably arranged on the machine shell 8. One end of the connecting link 304 is connected to the transmission connecting rod 303, and the other end is arranged on the cutter holder 2.

[0036] The swing of the driving swing rod 301 drives the swing of the transmission connecting rod 303, and the swing of the transmission connecting rod 303 drives the up and down movement of the cutter holder 2 through the connecting link 304, which can drive the cutter to cut the cloth downward.

[0037] A cutter guide sleeve 9 for the up and down sliding of the cutter holder 2 is provided on the machine shell 8, and a guide groove 10 matching with the cutter guide sleeve is provided on the cutter holder 2. A mutually matching sliding plane is provided between the cutter guide sleeve 9 and the guide groove 10, making the movement of the cutter holder 2 smoother and the cloth cutting speed faster.

[0038] A button 12 for controlling the air cylinder solenoid valve is provided on the machine shell 8. The movement of the air cylinder is controlled through the button 12 to complete the switching action, which is convenient to operate and realizes fast switching.

[0039] The transmission shaft 401 and the rotating shaft 11 are both arranged on the machine shell.

[0040] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A cloth cutting device for a sewing machine, comprising a housing (8), a cutter (1) and a corresponding cutter seat (2), characterized in that: The invention also comprises a cutter swing arm assembly (3) capable of driving the cutter (1) to cut cloth, and a driving assembly (4) for driving the cutter swing arm assembly to move. The driving assembly (4) comprises a transmission shaft (401) and a driving connecting rod assembly (402) for driving the transmission shaft (401) to rotate. The cutter swing arm assembly (3) comprises a driving crank (301) with one end disposed on the transmission shaft (401), and a driving swing arm (302) with one end sliding on the driving crank (301). The invention also comprises a switching structure (5) for driving the driving swing arm to slide on the driving crank to switch between a driving state and a non-driving state. When the driving swing arm (302) is in the non-driving state, the corresponding end of the driving swing arm (302) is located at one end where the driving crank (301) is connected to the transmission shaft (401), and the round handle (14) at the connection of the driving swing arm is coaxial with the transmission shaft (401). When the driving swing arm is in the driving state, the driving swing arm is located at the other end of the driving crank.

2. The cloth cutting device for a sewing machine according to claim 1, characterized in that: The driving connecting rod assembly (402) comprises a driving cam (4021), a driving arm (4022) with one end arranged on the driving cam (4021), and a connecting rod (4023) connecting the other end of the driving arm and the transmission shaft.

3. The cloth cutting device for a sewing machine according to claim 1, characterized in that: The switching structure (5) comprises a driving cylinder (501), a switching crank (502), and a first connecting rod (503) connecting the switching crank (502) and the cylinder joint; one end of the switching crank (502) is connected to the first connecting rod (503), and the other end is connected to the driving rocker arm (302) via a second connecting rod (504); the middle part is rotatably connected to the rotating shaft (11).

4. The cloth cutting device for a sewing machine according to claim 1, characterized in that: The driving crank (301) is provided with a slide groove (6) and a slider (7) matched with the slide groove (6), and one end of the driving rocker arm (302) is rotatably connected to the slider (7).

5. The cloth cutting device for a sewing machine according to claim 4, characterized in that: Both ends of the driving crank (301) are provided with blocking pins (13) for blocking the sliding block (7).

6. The cloth cutting device for a sewing machine according to claim 1, characterized in that: The cutter rocker arm assembly (3) further comprises a transmission connecting rod (303) and a connecting connecting rod (304); one end of the transmission connecting rod (303) is connected to the driving rocker arm (302), and the other end is connected to the connecting connecting rod (304); the middle portion is rotatably disposed on the housing (8).

7. The cloth cutting device for a sewing machine according to claim 6, characterized in that: One end of the connecting rod is connected to the transmission connecting rod (303), and the other end is arranged on the cutter seat (2).

8. The cloth cutting device for a sewing machine according to claim 1, characterized in that: The housing (8) is provided with a cutter guide sleeve (9) for the cutter seat (2) to slide up and down, and the cutter seat (2) is provided with a guide groove (10) that cooperates with the cutter guide sleeve.

9. The cloth cutting device for a sewing machine according to claim 1, characterized in that: The housing (8) is provided with a button (12) for controlling the cylinder solenoid valve.

10. The cloth cutting device for a sewing machine according to claim 3, characterized in that: The transmission shaft (401) and the rotating shaft (11) are both arranged on the casing.

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