CN106948104B

CN106948104B - Dustproof sewing machine

Info

Publication number: CN106948104B
Application number: CN201710287299.7A
Authority: CN
Inventors: 陈满良; 楼俏军
Original assignee: Zhongjie Sewing Machine Co Ltd
Current assignee: Zhongjie Sewing Machine Co Ltd
Priority date: 2017-04-27
Filing date: 2017-04-27
Publication date: 2023-02-07
Anticipated expiration: 2037-04-27
Also published as: CN106948104A

Abstract

The invention provides a dustproof sewing machine, and belongs to the technical field of sewing machines. The problem that an existing sewing machine cannot guarantee smooth operation of a curved needle is solved. This can dirt-proof sewing machine, including casing and slide bar seat, slide bar seat fixed connection is on the casing, be provided with the seat hole in the slide bar seat, still be provided with the perforation that runs through slide bar seat upper end and lower extreme in the slide bar seat, perforation and seat hole cross arrangement and intercommunication, be provided with the slide bar cover in the seat hole, the slide bar cover can rotate in the seat hole, wear to be equipped with the slide bar in the perforation, the slide bar passes the slide bar cover and can slide from top to bottom in the slide bar cover, the upper end of slide bar seat is provided with dustproof construction, dustproof construction can be sealed with the perforation that is located the seat hole top. The sewing machine has the advantages of ensuring smooth operation of the curved needle and the like.

Description

Dustproof sewing machine

Technical Field

The invention belongs to the technical field of sewing machines, and relates to a dustproof sewing machine.

Background

A sewing machine is a machine for sewing a material to be sewn by sewing a thread, and generally includes a needle bar mechanism, a needle bar swing mechanism, a thread take-up mechanism, a feeding mechanism, a thread hooking mechanism, a pressing mechanism, and the like. The needle bar mechanism is a mechanism for the sewing needle to penetrate through the sewing material with the thread, and in order to meet the special stitch requirement, a looper assembly is arranged in the needle bar mechanism of the sewing machine. The looper subassembly includes the looper, the slide bar be connected with the looper and with the drive group of slide bar connection, still be provided with the slide bar seat on the casing, the slide bar wears to establish on the slide bar seat, often sets up lubricating oil between slide bar seat and slide bar for making the slide bar operation smooth and easy, often sets up leak protection oil device between slide bar and slide bar seat in order to prevent that lubricating oil from revealing to come sewing material and suture pollution.

Chinese patent literature discloses an oil leakage preventing device for an upper looper assembly [ application number: 200510128726.4; publication No.: 1782167B ] comprises an upper looper guide member fixed to a frame of a sewing machine, a cylindrical upper looper guide body fitted and held in a circular hole formed in the upper looper guide member so as to be rotatable around the center of the circle, an upper looper base slidably inserted into a hole formed through the upper looper guide body in the radial direction and having an upper looper fixed to the upper end thereof, an upper looper shaft connected to the lower end of the upper looper base in an interlocked state by a link mechanism so that the upper looper base is guided by the upper looper guide body in accordance with the forward and backward reciprocating rotation of the upper looper shaft and is slidable and movable around the center of the circle, an upper looper base, a link mechanism for supplying a lubricating oil to the outer peripheral surface of the upper looper base, and a lubricating oil supply mechanism for supplying a lubricating oil to the outer peripheral surface of the upper looper base. The cylindrical upper looper guide body has two through holes formed vertically to the through hole, an oil seal ring inserted in the through hole in the upper part and sliding elastically on the outer peripheral surface of the upper looper seat and with an elastic lip for scraping the residual lubricating oil adhered to the outer peripheral surface, and an oil sucking ring inserted in the through hole in the lower part and capable of sucking and holding the scraped residual lubricating oil. And under the state that one end is connected with the suction pump, the other end suction inlet of an oil discharge hole formed on the sewing machine frame is connected with the opening of the through long hole at the lower part, and the residual lubricating oil absorbed and held by the oil suction ring is forcibly recovered through the oil discharge hole.

This oil leakage preventing device can prevent the leakage of the lubricating oil, but it cannot prevent the dust from falling into the upper looper guide body and between the upper looper guide member and the upper looper guide body, and the dust easily causes the upper looper base not to smoothly slide in the upper looper guide body and the upper looper guide body not to smoothly rotate in the upper looper guide member, which would cause the upper looper not to smoothly move.

Disclosure of Invention

The invention aims to provide a dustproof sewing machine aiming at the problems in the prior art, and solves the technical problem of ensuring the smooth movement of a curved needle.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a can dirt-proof sewing machine, includes casing and slide bar seat, slide bar seat fixed connection is on the casing, be provided with the seat hole in the slide bar seat, still be provided with the perforation that runs through slide bar seat upper end and lower extreme in the slide bar seat, perforation and seat hole cross arrangement and intercommunication, be provided with the slide bar cover in the seat hole, the slide bar cover can rotate in the seat hole, wear to be equipped with the slide bar in the perforation, the slide bar passes the slide bar cover and can slide from top to bottom in the slide bar cover, its characterized in that, the upper end of slide bar seat is provided with dustproof construction, dustproof construction can be sealed with the perforation that is located the seat hole top.

The upper end of the sliding rod is fixedly connected with the curved needle, the lower end of the sliding rod is connected with the curved needle driving group, and the curved needle driving group moves to drive the sliding rod to swing in the through hole, so that the curved needle is driven to move. The swing of the sliding rod is divided into the sliding of the sliding rod in the sliding rod sleeve and the rotation of the sliding rod sleeve in the sliding rod seat, and the smooth movement of the curved needle can be ensured only if the sliding rod is ensured to slide smoothly in the sliding rod sleeve and the sliding rod sleeve smoothly rotates in the sliding rod seat simultaneously.

The perforation that dustproof construction will be located the seat hole top is sealed, so, the dust in the environment that sewing machine is located will be blockked in the outside of slide bar cover by dustproof construction, can prevent that the dust from dropping in the slide bar cover and dropping between slide bar cover and the slide bar seat, guarantees the slide bar simultaneously and can be in the smooth and easy slip of slide bar cover, guarantees the slide bar cover and smoothly rotates in the slide bar seat to guarantee that the looper carries out smooth and easy motion.

Meanwhile, the dustproof structure can prevent lubricating oil in the sliding rod seat from leaking to the curved needle from the upper end of the through hole, so that the lubricating oil is prevented from polluting sewing materials and sewing threads. Lubricating oil blocked by the dustproof mechanism flows back to the position between the sliding rod and the sliding rod sleeve and the position between the sliding rod sleeve and the sliding rod seat to lubricate under the action of gravity, so that the sliding rod can slide more smoothly in the sliding rod sleeve and can rotate more smoothly in the sliding rod seat, and the curved needle can move smoothly.

In foretell dustproof sewing machine of ability, dustproof construction includes dustproof sheet and sets up the spout in the slide bar seat upper end, the spout is alternately just communicated with the perforation, the spout is located the top of seat hole, the dustproof sheet is embedded into in the spout and can be in the spout horizontal slip, the slide bar pass the dustproof sheet and with dustproof sheet sealing connection.

The dustproof sheet is embedded into the sliding groove, and the sliding groove is arranged above the seat hole, so that dust cannot fall into the sliding rod sleeve and between the sliding rod seat and the sliding rod sleeve, and smooth movement of the curved needle is guaranteed. The dustproof sheet can slide left and right in the sliding groove, so that the dustproof sheet is prevented from being incapable of moving to block the swinging of the sliding rod, and the smooth movement of the curved needle is guaranteed.

In foretell dustproof sewing machine of ability, dustproof construction includes dustproof piece and fixes the spout seat in the slide bar seat upper end, be provided with the hole of stepping down on the spout seat, the hole of stepping down is passed to the upper end of slide bar, be provided with in the spout seat with step down the crossing spout that just communicates in the hole, dustproof piece imbeds in the spout and can slide from side to side in the spout, the slide bar pass dustproof piece and with dustproof piece sealing connection.

The upper port of the through hole is shielded by the dustproof sheet and the sliding groove seat, so that dust cannot fall into the sliding rod sleeve and between the sliding rod seat and the sliding rod sleeve from the through hole, and smooth movement of the curved needle is guaranteed. Imbed the dustproof sheet in the spout, the dustproof sheet can slide in the spout, thereby prevents that the dustproof sheet can not move and hinders the swing of slide bar to this guarantees the motion that the looper can be smooth and easy.

In foretell dustproof sewing machine of ability, dustproof construction includes the dustproof piece, the dustproof piece is made by elastic material, the dustproof piece covers on fenestrate last port, the slide bar passes the dustproof piece, the junction sealing fixation of slide bar and dustproof piece, the outer edge of dustproof piece is fixed and sealing connection with the slide bar seat.

The arrangement of the dustproof sheet can ensure that dust is blocked outside the sliding rod seat, thereby ensuring the smooth operation of the curved needle. The dustproof sheet has elasticity, and can adapt to the motion of slide bar through warping, makes the dustproof sheet can not obstruct the motion of slide bar to guarantee the smooth and easy operation of looper.

In the dustproof sewing machine, the dustproof sheet is provided with the sealing hole, the sliding rod penetrates through the sealing hole, and the side wall surface of the sealing hole is attached to the outer side surface of the sliding rod.

The arrangement prevents lubricating oil from leaking out along the sliding rod; on the other hand, dust can be prevented from falling into the sliding rod sleeve and between the sliding rod sleeve and the sliding rod seat from the sealing hole, and smooth movement of the curved needle is guaranteed.

In the above sewing machine capable of preventing dust, an upper surface of the dust-proof piece is abutted against an upper wall surface of the chute. Therefore, dust can not enter the sliding groove, and the dust-proof sheet can smoothly slide left and right in the sliding groove, so that smooth operation of the bent needle is guaranteed.

In the dustproof sewing machine, the cover plate is fixed on the front end face of the sliding rod seat, the seat hole penetrates through the front end face of the sliding rod seat, and the cover plate is fixed on the front end face of the sliding rod seat and seals the seat hole.

The slide rod seat is fixed on the machine shell, the front end face of the slide rod seat faces outwards, then the slide rod sleeve is installed in the seat hole from the front end face of the slide rod seat, and then the cover plate is fixed on the front end face of the slide rod seat so as to seal the seat hole. The seat hole penetrates through the front end face of the sliding rod seat to enable the sliding rod sleeve to be convenient to install, and the cover plate seals the seat hole to prevent dust from entering the seat hole from the front end face of the sliding rod seat, so that the sliding rod sleeve can smoothly rotate in the seat hole, and smooth movement of a curved needle is guaranteed.

In the dustproof sewing machine, a transition surface is arranged at the joint of the hole wall at the upper end of the seat hole and the wall of the through hole, and an oil storage cavity is formed between the transition surface and the outer side surface of the sliding rod sleeve.

Part of the lubricating oil blocked by the dustproof sheet flows into the oil storage cavity from the perforated hole wall, and in the rotating process of the sliding rod sleeve, the lubricating oil in the oil storage cavity continuously enters between the hole wall of the seat hole and the outer side surface of the sliding rod sleeve, so that the sliding rod sleeve rotates smoothly, and the curved needle is ensured to operate smoothly.

In the dustproof sewing machine, the sliding groove is an arc-shaped groove, the middle part of the sliding groove is arched upwards, the screenshot of the dustproof sheet is arc-shaped and is matched with the sliding groove, the sliding rod seat is provided with a hole I, and the side part of the sliding groove is communicated with Kong Yilian.

The sliding groove is an arc-shaped groove, the dustproof sheet is arc-shaped and can be matched with the sliding rod sleeve to rotate, and the generation of a gap between the dustproof sheet and the sliding rod is reduced, so that dust is effectively prevented from entering the seat hole, and smooth movement of the curved needle is guaranteed. If dust enters the sliding groove, the first hole can also facilitate the dust cleaning and the installation of a dust cleaning recovery device. The first hole can prevent the two sides of the sliding groove from forming a closed space so that the dust-proof sheet is difficult to slide.

In the dustproof sewing machine, the sliding rod seat is internally provided with an oil return channel penetrating through the lower end face of the sliding rod seat, and the oil return channel is communicated with the first hole.

Some lubricating oil blocked by the dustproof sheet enters the hole I, the outlet of the oil return channel is communicated with the oil pan, the outlet of the oil return channel is positioned on the lower end face of the sliding rod seat, and the lubricating oil can be smoothly guided out of the sliding rod seat by the oil return channel under the action of gravity so as to return to the oil pan.

In the above dustproof sewing machine, the chute penetrates through the front end face of the slide bar seat, and the cover plate seals the opening of the chute on the front end face of the slide bar seat.

The dustproof sheet can be installed and disassembled through the opening of the sliding groove in the front end face of the sliding rod seat, and the cover plate is opened to form disassembly and assembly of the dustproof sheet, so that the dustproof sheet is convenient to disassemble and assemble.

In the dustproof sewing machine, the lower surface of the sliding groove seat is provided with the fixing plate, the fixing plate is provided with the protruding positioning block, the sliding rod seat is provided with the concave positioning groove, the positioning block is inserted into the positioning groove, the front end face of the sliding groove seat is provided with the baffle, the baffle is connected with a screw, and the baffle is fixed on the sliding rod seat through the screw.

The sliding groove seat is placed on the upper end face of the sliding rod seat, the positioning block is embedded into the positioning groove, and then the baffle is fixed on the sliding rod seat through the screw, so that the sliding groove seat is fixed on the sliding rod seat, and the mounting method of the sliding groove seat is rapid.

In the dustproof sewing machine, an oil return channel penetrating through the sliding rod seat is further arranged in the sliding rod seat, a second hole communicated with the sliding groove is formed in the sliding groove seat, and the second hole is further communicated with the oil return channel.

The oil return passage is communicated with the oil pan, and the lubricating oil can return to the oil pan through the oil return passage.

Compared with the prior art, the invention has the following advantages:

the sliding rod seat is provided with the dustproof structure, so that the dustproof structure seals the through hole above the seat hole, dust can be prevented from entering the sliding rod sleeve and between the sliding rod sleeve and the sliding rod seat, the sliding rod can smoothly slide in the sliding rod sleeve, the sliding rod sleeve can smoothly rotate in the sliding rod seat, and the curved needle can smoothly move. The sliding rod seat is provided with a sliding groove, the sliding groove is internally and slidably connected with a dustproof sheet for plugging the through hole, the dustproof sheet is positioned above the sliding rod sleeve, or the sliding rod seat is fixedly arranged on the sliding rod seat, the sliding groove is provided with a sliding groove, the sliding groove is internally and slidably connected with a dustproof sheet for shielding the upper port of the through hole, and the smooth movement of the curved needle is ensured. The wall of the hole of the seat hole is provided with a transition surface to form an oil storage cavity between the transition surface and the outer side surface of the sliding rod sleeve, the side wall surface of the sealing hole of the dustproof sheet is attached to the outer side surface of the sliding rod, and the front end surface of the sliding rod seat is provided with a cover plate to further ensure that the curved needle moves smoothly.

Drawings

FIG. 1 is a partial perspective view of a first embodiment of the present sewing machine;

FIG. 2 is an exploded view of the looper assembly in one embodiment of the present sewing machine;

FIG. 3 is a cross-sectional view of the looper assembly in one embodiment of the present sewing machine;

FIG. 4 is an enlarged view at A in FIG. 3;

FIG. 5 is a partial perspective view of a second embodiment of the present sewing machine;

FIG. 6 is an exploded view of the looper assembly in the second embodiment of the sewing machine;

FIG. 7 is a cross-sectional view of the looper assembly in a second embodiment of the present sewing machine;

fig. 8 is an enlarged view at B in fig. 7.

In the figure, 1, a housing; 2. a curved needle assembly; 3. a slide bar seat; 3a, a seat hole; 3a1, a transition surface; 3b, punching; 3c, a chute; 3d, an oil storage cavity; 3e, a hole I; 3f, an oil return channel; 3g, positioning a groove; 4. a slide bar sleeve; 5. a slide bar; 6. a dust-proof sheet; 6a, sealing the hole; 7. a cover plate; 8. bending a needle; 9. a curved needle rocker; 10. a chute seat; 10a, a yielding hole; 10b, fixing plates; 10c, positioning blocks; 10d, a baffle plate; 10e, hole two; 11. and (4) a screw.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-4, a sewing machine capable of preventing dust comprises a machine shell 1 and a looper assembly 2, wherein the looper assembly 2 comprises a sliding rod seat 3, and the sliding rod seat 3 is fixedly connected on the machine shell 1. The right side part of the sliding rod seat 3 is provided with a mounting hole, a bolt is connected in the mounting hole, the sliding rod seat 3 is fixed on the machine shell 1 through the bolt, and the rear end face of the sliding rod seat 3 is attached to the front end face of the machine shell 1. A seat hole 3a penetrating through the slide rod seat 3 is formed in the front end face of the left side portion of the slide rod seat 3, the seat hole 3a is cylindrical, a slide rod sleeve 4 is arranged in the seat hole 3a, the slide rod sleeve 4 is cylindrical, the outer side face of the slide rod sleeve 4 is rotatably connected with the hole wall face of the seat hole 3a, and the slide rod sleeve 4 can rotate in the seat hole 3 a. The slide rod seat 3 is also internally provided with a through hole 3b, the through hole 3b is communicated with the seat hole 3a in a crossing way, and the through hole 3b penetrates through the upper end face and the lower end face of the slide rod seat 3. A sliding rod 5 penetrates through the through hole 3b, the upper end and the lower end of the sliding rod 5 extend out of the sliding rod seat 3 respectively, a through hole penetrating through the sliding rod sleeve 4 is formed in the sliding rod sleeve 4, the sliding rod 5 penetrates through the through hole of the sliding rod sleeve 4 and can slide up and down in the through hole, the upper end opening of the through hole is in an inverted cone shape, and the lower end opening of the through hole is in a cone shape. The upper end of the sliding rod 5 is fixedly connected with a curved needle 8, the lower end of the sliding rod 5 is connected with a curved needle driving set, the curved needle driving set comprises a curved needle rocker 9, one end of the curved needle rocker 9 is hinged with the lower end of the sliding rod 5, and the other end of the curved needle rocker 9 is connected with the main shaft. The main shaft rotates to drive the curved needle rocker 9 to swing, and the curved needle rocker 9 swings to drive the sliding rod 5 to swing in the through hole 3b, so that the curved needle 8 is driven to move. The swing of the sliding rod 5 is divided into the sliding of the sliding rod 5 in the sliding rod sleeve 4 and the rotation of the sliding rod sleeve 4 in the sliding rod seat 3, and the smooth movement of the curved needle 8 can be ensured only if the sliding rod 5 is ensured to slide smoothly in the sliding rod sleeve 4 and the sliding rod sleeve 4 is ensured to rotate smoothly in the sliding rod seat 3 at the same time.

The upper end of the slide rod seat 3 is provided with a dustproof structure which can seal a through hole 3b above the seat hole 3 a. Dustproof construction includes dustproof piece and sets up spout 3c in 3 upper ends of slide bar seat, spout 3c and perforation 3b cross arrangement and intercommunication, spout 3c is located the top of seat hole 3a, spout 3c runs through preceding terminal surface and the rear end face of slide bar seat 3, spout 3c is the middle part of arc wall and spout 3c and upwards arches, it all sets up porose 3e to lie in the left side and the right side of spout 3c on the slide bar seat 3, spout 3 c's left side and the left hole 3e intercommunication that lies in spout 3c, spout 3 c's right side and the hole 3e intercommunication that lies in spout 3c right side. If dust enters the chute 3c, the first hole 3e is provided to facilitate dust cleaning and installation of a dust-cleaning recycling device (not shown). The dustproof sheet 6 is embedded into the sliding groove 3c and can slide left and right in the sliding groove 3c, and the dustproof sheet 6 seals a gap between the hole wall of the through hole 3b above the seat hole 3a and the outer side wall of the sliding rod 5. The dustproof sheet 6 is positioned above the sliding rod sleeve 4, the dustproof sheet 6 is arc-shaped and matched with the sliding groove 3c, a sealing hole 6a is formed in the dustproof sheet 6, the sliding rod 5 penetrates through the sealing hole 6a, and the side wall surface of the sealing hole 6a is attached to the outer side surface of the sliding rod 5. The sliding rod 5 penetrates through the dustproof sheet 6 and is connected with the dustproof sheet 6 in a sealing mode, and the sliding rod 5 can slide up and down in the dustproof sheet 6. The upper surface of the dustproof sheet 6 is attached to the upper wall surface of the chute 3c, and the lower surface of the dustproof sheet 6 is attached to the lower wall surface of the chute 3c, so that dust can be prevented from entering the chute 3c to influence the sliding of the dustproof sheet 6 in the chute 3 c. A cover plate 7 is fixed on the front end face of the slide bar seat 3, the cover plate 7 seals the front end opening of the seat hole 3a, and the cover plate 7 seals the opening of the chute 3c on the front end face of the slide bar seat 3. The rear end face of the sliding rod seat 3 is attached to the front end face of the machine shell 1, the front end face of the machine shell 1 seals the rear end port of the seat hole 3a, and the front end face of the machine shell 1 seals the opening of the sliding groove 3c on the rear end face of the sliding rod seat 3. The joint of the hole wall of the upper end of the seat hole 3a and the hole wall of the through hole 3b is provided with a transition surface 3a1, and an oil storage cavity 3d is formed between the transition surface 3a1 and the outer side surface of the sliding rod sleeve 4. An oil return channel 3f penetrating through the sliding rod seat 3 is arranged on the right side of the sliding groove 3c in the sliding rod seat 3, and the oil return channel 3f is communicated with a first hole 3e on the right side of the sliding groove 3 c.

The dust-proof sheet 6 prevents dust from falling into the through hole of the slide rod sleeve 4 and between the slide rod sleeve 4 and the slide rod seat 3, so that the slide rod 5 can slide smoothly in the slide rod sleeve 4, and the slide rod sleeve 4 can rotate smoothly in the slide rod seat 3, thereby ensuring that the curved needle 8 can move smoothly. Meanwhile, the dustproof sheet 6 can prevent the lubricating oil in the sliding rod seat 3 from leaking to the curved needle 8 from the upper port of the through hole 3b, and particularly can prevent the lubricating oil from being thrown out by the sliding rod 5, so that the lubricating oil is prevented from polluting sewing materials and sewing threads. Under the action of gravity, one part of lubricating oil blocked by the dustproof sheet 6 flows back to an oil storage cavity 3d between the sliding rod sleeve 4 and the sliding rod seat 3 and an upper port of a through hole of the sliding rod sleeve 4, and in the process of sliding of the sliding rod 5 and rotation of the sliding rod sleeve 4, the lubricating oil enters between the sliding rod 5 and the sliding rod sleeve 4 and between the sliding rod sleeve 4 and the sliding rod seat 3 for lubrication, so that the sliding rod 5 slides more smoothly in the sliding rod sleeve 4 and the sliding rod sleeve 4 rotates more smoothly in the sliding rod seat 3, and the smooth movement of the curved needle 8 is ensured.

Example two

As shown in fig. 5-8, the dustproof structure includes a dustproof sheet 6 and a chute seat 10 fixed on the upper end of the slide bar seat 3, an abdicating hole 10a penetrating through the chute seat 10 is provided on the upper end surface of the chute seat 10, and the abdicating hole 10a is opposite to the through hole 3 b. The upper end of the sliding rod 5 penetrates through the abdicating hole 10a and then is fixedly connected with the curved needle 8, a sliding groove 3c which is crossed and communicated with the abdicating hole 10a is formed in the rear end face of the sliding groove seat 10, the dustproof sheet 6 is embedded into the sliding groove 3c and can slide left and right in the sliding groove 3c, the dustproof sheet 6 covers an upper port of the through hole 3b, and the dustproof sheet 6 seals a gap between the hole wall of the abdicating hole 10a and the outer side wall of the sliding rod 5. The dustproof sheet 6 is provided with a sealing hole 6a, the sliding rod 5 penetrates through the sealing hole 6a, and the hole wall of the sealing hole 6a is attached to the outer side face of the sliding rod 5. The sliding rod 5 penetrates through the dustproof sheet 6 and is connected with the dustproof sheet 6 in a sealing mode, and the sliding rod 5 can slide up and down in the dustproof sheet 6. The upper surface of the dustproof sheet 6 is attached to the upper surface of the sliding groove 3c, so that dust can be prevented from entering the sliding groove 3c to influence the sliding of the dustproof sheet 6 in the sliding groove 3 c. The lower surface of the left end of the sliding groove seat 10 is provided with a convex fixing plate 10b, the fixing plate 10b is positioned on the left side of the sliding rod seat 3, the right end surface of the fixing plate 10b is provided with a convex positioning block 10c, the left end surface of the sliding rod seat 3 is provided with a concave positioning groove 3g, the right end surface of the fixing plate 10b is attached to the left end surface of the sliding rod seat 3, and the positioning block 10c is inserted into the positioning groove 3 g. The front end surface of the chute seat 10 is provided with a baffle plate 10d, the baffle plate 10d is connected with a screw 11, and the baffle plate 10d is fixed on the slide bar seat 3 through the screw 11. The front end face of the slide rod seat 3 is fixedly connected with a cover plate 7, and the front end opening of the seat hole 3a is sealed by the cover plate 7. The rear end face of the slide bar seat 3 abuts against the front end face of the machine shell 1, the front end face of the machine shell 1 seals the rear end port of the seat hole 3a, and the front end face of the machine shell 1 seals the opening of the sliding groove 3c on the rear end face of the slide bar seat 3. The lower surface of the sliding groove seat 10 is attached to the upper end surface of the sliding rod seat 3, and the upper port of the through hole 3b of the sliding rod seat 3 is sealed by the sliding groove seat 10, the dustproof sheet 6 and the machine shell 1. Still be provided with the oil return passage 3f that runs through the draw-bar seat 3 in the draw-bar seat 3, oil return passage 3f and food tray intercommunication, oil return passage 3f is located the right side of seat hole 3a, is provided with the hole two 10e with spout 3c right side intercommunication on the spout seat 10, and hole two 10 still communicates with oil return passage 3f, and the last port department of oil return passage 3f often still is provided with the felt, prevents that the dust from entering into in the food tray. If a gap exists between the lower surface of the sliding chute seat 10 and the upper end surface of the sliding rod seat 3, the rear end surface of the baffle plate II is attached to the front end surface of the sliding rod seat 3 by arranging the baffle plate II on the lower surface of the sliding chute seat 10, so that the gap between the lower surface of the sliding chute seat 10 and the upper end surface of the sliding rod seat 3 is closed. The other structure is the same as the first embodiment.

The arrangement of the dustproof sheet 6 and the chute seat 10 enables dust to be blocked outside the through hole 3b, and prevents the dust from falling into the through hole of the slide bar sleeve 4 and between the slide bar sleeve 4 and the slide bar seat 3 from the upper end opening of the through hole 3b, so that the slide bar 5 can be ensured to slide smoothly in the slide bar sleeve 4, and meanwhile, the slide bar sleeve 4 can be ensured to rotate smoothly in the slide bar seat 3, and the smooth movement of the curved needle 8 is ensured. Meanwhile, the dustproof sheet 6 and the chute seat 10 can prevent the lubricating oil in the sliding rod seat 3 from leaking to the curved needle 8 from the upper port of the through hole 3b, and particularly can prevent the lubricating oil from being thrown out by the sliding rod 5, so that the lubricating oil is prevented from polluting sewing materials and sewing threads. Under the action of gravity, one part of lubricating oil blocked by the dustproof sheet 6 flows back to an oil storage cavity 3d between the sliding rod sleeve 4 and the sliding rod seat 3 and an upper port of a through hole of the sliding rod sleeve 4, and in the process that the sliding rod 5 slides and the sliding rod sleeve 4 rotates, the lubricating oil enters between the sliding rod 5 and the sliding rod sleeve 4 and between the sliding rod sleeve 4 and the sliding rod seat 3, so that the sliding rod 5 slides more smoothly in the sliding rod sleeve 4 and the sliding rod sleeve 4 rotates more smoothly in the sliding rod seat 3, and the smooth movement of the curved needle 8 is ensured. The other part of the lubricating oil blocked by the dust-proof sheet 6 flows to the hole two 10e on the right side of the chute 3c and finally returns to the oil pan.

EXAMPLE III

Dustproof construction includes dustproof sheet 6, and dustproof sheet 6 is made by elastic material, for example rubber or silica gel, and dustproof sheet 6's cross-section is wavy simultaneously, makes dustproof sheet 6 have the telescopic performance, and dustproof sheet 6 covers the last port of perforation 3b, and slide bar 5 passes dustproof sheet 6, and slide bar 5 is fixed with the junction of dustproof sheet 6 is sealed, and the outer edge of dustproof sheet 6 is fixed and sealing connection with slide bar seat 3. The other structure is the same as the first embodiment. The arrangement of the dustproof sheet 6 prevents external dust from entering the sliding rod seat 3, so that the sliding rod 5 can slide smoothly in the sliding rod sleeve 4, and the sliding rod sleeve 4 can rotate smoothly in the sliding rod seat 3, thereby ensuring that the curved needle 8 can move smoothly. The dustproof sheet 6 has elasticity, and the dustproof sheet 6 can adapt to the movement of the slide rod 5 through deformation, so that the dustproof sheet 6 cannot block the movement of the slide rod 5, and smooth operation of the curved needle is guaranteed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The dustproof sewing machine comprises a machine shell (1) and a sliding rod seat (3), wherein the sliding rod seat (3) is fixedly connected to the machine shell (1), a seat hole (3 a) is formed in the sliding rod seat (3), a through hole (3 b) penetrating through the upper end and the lower end of the sliding rod seat (3) is further formed in the sliding rod seat (3), the through hole (3 b) and the seat hole (3 a) are arranged in a crossed mode and communicated, a sliding rod sleeve (4) is arranged in the seat hole (3 a), the sliding rod sleeve (4) can rotate in the seat hole (3 a), a sliding rod (5) penetrates through the through hole (3 b), the sliding rod (5) penetrates through the sliding rod sleeve (4) and can slide up and down in the sliding rod sleeve (4), the dustproof sewing machine is characterized in that a dustproof structure is arranged between the upper end of the sliding rod seat (3) and the upper end of the sliding rod sleeve (4) extending out of the sliding rod sleeve (4) and can seal the through hole (3 b) above the sliding rod seat hole (3 a), the dustproof structure comprises a dustproof sheet (6) and a chute (3 c) which is arranged above the sliding rod seat (3 c) and can be communicated with a chute (3 c) at the sliding chute at the upper end of the sliding rod (3 c), the sliding rod (5) penetrates through the dustproof sheet (6) and is connected with the dustproof sheet (6) in a sealing mode.

2. The sewing machine capable of preventing dust according to claim 1, wherein the seat hole (3 a) penetrates through a front end face of the slide bar seat (3), a cover plate (7) is fixed on the front end face of the slide bar seat (3), and the cover plate (7) closes the seat hole (3 a).

3. The sewing machine capable of preventing dust according to claim 1, wherein the joint of the hole wall of the upper end of the seat hole (3 a) and the hole wall of the through hole (3 b) is provided with a transition surface (3 a 1), and an oil storage cavity (3 d) is formed between the transition surface (3 a 1) and the outer side surface of the slide bar sleeve (4).

4. The sewing machine capable of preventing dust according to claim 1, wherein the sliding groove (3 c) is an arc-shaped groove, the middle part of the sliding groove (3 c) is arched upwards, the section of the dust-proof sheet (6) is arc-shaped and matched with the sliding groove (3 c), a hole I (3 e) is formed in the sliding rod seat (3), and the side part of the sliding groove (3 c) is communicated with the hole I (3 e).

5. The sewing machine capable of preventing dust according to claim 1, wherein a cover plate (7) is fixed on the front end face of the slide bar seat (3), the slide groove (3 c) penetrates through the front end face of the slide bar seat (3), and the cover plate (7) closes an opening of the slide groove (3 c) on the front end face of the slide bar seat (3).

6. The dustproof sewing machine comprises a machine shell (1) and a sliding rod seat (3), wherein the sliding rod seat (3) is fixedly connected to the machine shell (1), a seat hole (3 a) is formed in the sliding rod seat (3), a through hole (3 b) penetrating through the upper end and the lower end of the sliding rod seat (3) is further formed in the sliding rod seat (3), the through hole (3 b) is arranged in a crossed mode with the seat hole (3 a) and communicated with the seat hole (3 a), a sliding rod sleeve (4) is arranged in the seat hole (3 a), the sliding rod sleeve (4) can rotate in the seat hole (3 a), a sliding rod (5) is arranged in the through hole (3 b) in a penetrating mode, the sliding rod (5) penetrates through the sliding rod sleeve (4) and can slide up and down in the sliding rod sleeve (4), the dustproof sewing machine is characterized in that the upper end of the sliding rod seat (3) and the upper end of the sliding rod (5) extending out of the sliding rod sleeve (4) are provided with a dustproof structure, the dustproof structure can seal the through hole (3 b) on the sliding rod seat hole (3 a) and a groove (10 c) formed in the sliding rod seat (10) and the upper end of the sliding rod seat (10 a) and a seat (10 a) which is provided with a yielding groove (10) and a yielding groove (10) which is communicated with the sliding rod seat (10 a) and a yielding groove (10 a) formed in the sliding rod seat (10), dustproof sheet (6) are embedded into chute (3 c) and can slide left and right in chute (3 c), slide bar (5) pass dustproof sheet (6) and with dustproof sheet (6) sealing connection.

7. Sewing machine capable of dust control according to claim 6, characterized in that said seat hole (3 a) penetrates the front end face of the slide bar seat (3), a cover plate (7) being fixed to the front end face of the slide bar seat (3), said cover plate (7) closing the seat hole (3 a).

8. Sewing machine capable of preventing dust according to claim 6, characterized in that the wall of the hole at the upper end of the housing (3 a) meets the wall of the through hole (3 b) with a transition surface (3 a 1), and an oil storage cavity (3 d) is formed between the transition surface (3 a 1) and the outer side of the sliding rod sleeve (4).

9. The sewing machine capable of preventing dust according to claim 6, wherein a fixing plate (10 b) is arranged on the lower surface of the sliding chute seat (10), a protruding positioning block (10 c) is arranged on the fixing plate (10 b), a concave positioning groove (3 g) is arranged on the sliding rod seat (3), the positioning block (10 c) is inserted into the positioning groove (3 g), a baffle (10 d) is arranged on the front end surface of the sliding chute seat (10), a screw (11) is connected onto the baffle (10 d), and the baffle (10 d) is fixed on the sliding rod seat (3) through the screw (11).

10. The sewing machine capable of preventing dust according to claim 6, wherein an oil return channel (3 f) penetrating through the sliding rod seat (3) is further arranged in the sliding rod seat (3), a second hole (10 e) communicated with the sliding groove (3 c) is arranged on the sliding groove seat (10), and the second hole (10 e) is further communicated with the oil return channel (3 f).