CN104294487A - Presser foot - Google Patents
Presser foot Download PDFInfo
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- CN104294487A CN104294487A CN201410449415.7A CN201410449415A CN104294487A CN 104294487 A CN104294487 A CN 104294487A CN 201410449415 A CN201410449415 A CN 201410449415A CN 104294487 A CN104294487 A CN 104294487A
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- China
- Prior art keywords
- boss
- cover plate
- control stick
- cloth pressing
- pressing foot
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Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/06—Presser feet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
The invention relates to a presser foot. The presser foot comprises a body, a body base and an elastic sliding mechanism. The body is made of POM composite materials. The upper surface of the body perpendicularly protrudes upwards to form a boss I and a boss II. The side face of the body perpendicularly protrudes upwards to form a boss III. Through holes are formed in the boss I and the boss II respectively. One end of the lower surface of the body perpendicularly protrudes downwards to form a supporting column. The body base is made of PC materials and is perpendicularly and fixedly connected to the other end of the lower surface of the body. The elastic sliding mechanism is arranged on the upper surface of the body and comprises a spring, an operation rod and a cover plate, wherein the operation rod and the cover plate are made of metal materials, one end of the operation rod penetrates through the through holes in the boss I and the boss II, the operation rod is fixedly connected with a check ring, the other end of the operation rod is fixedly connected with the cover plate, and a slide groove is formed in one side of the cover plate and is limited to the boss III. The presser foot is simple in structure and light in overall weight while the mechanical properties such as strength, rigidity and hardness are not lowered, and the presser foot is convenient to use and high in universality.
Description
Technical field
The invention belongs to textile technology field, relate to a kind of sewing device, particularly a kind of cloth pressing foot.
Background technology
Cloth pressing foot executes stressed component on the surface at sewing, is divided by its function as common presser feet, extraordinary presser feet.From patent classification, extraordinary presser feet can divide for the two large classes by the parts that can be movable relatively and band roller bearing.Cloth pressing foot has generally included cloth pressing foot body, such as existing a kind of Caterpillar presser foot for sewing machine, it is by the cloth pressing foot body with gap, the series cylinder on body is contained in drum shaft, be enclosed within the crawler belt composition outside cylinder, wherein an outer surface of cylinder is provided with decorative pattern, and ratchet is equipped with in the drum shaft one end be applied on this decorative pattern cylinder, and stopping wheel taken by ratchet.
This technology, owing to adopting caterpillar belt structure and can only one-way movement, therefore, avoids the possibility that cloth is scratched.But this technical pattern is complicated, and manufacturing technique is too high, and then uses more complicated, and versatility is poor.
In sum, for solving the deficiency on existing cloth foot pressing structure, need to design the cloth pressing foot that a kind of structure is simple, easy to use, versatility is stronger.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose the cloth pressing foot that a kind of structure is simple, easy to use, versatility is stronger.
Object of the present invention realizes by following technical proposal: a kind of cloth pressing foot, comprises
Body, described body is elongated, on the upper surface of body vertical protrude be formed boss I with boss II and on the side of body vertical protrusion be formed with boss III, boss I and boss II all offer the through hole of concentric, give prominence to vertically downward in one end of the lower surface of body and be formed with support column, boss II, between boss I and support column, described support column offers and runs through the upper surface of body and the pin hole of lower surface;
Noumenal seat, is vertically connected in the other end of body lower surface;
Dan Hua mechanism, be arranged on the upper surface of body, comprise control stick, cover plate and spring, the through hole be opened on boss I and boss II is run through in one end of described control stick, control stick is fixed with back-up ring and back-up ring can be resisted against on boss II when action bars moves axially, control stick is arranged with spring and spring one end is resisted against on boss I, the other end is resisted against on back-up ring, the other end of described control stick is fixed with cover plate, be provided with sliding tray in the side of cover plate, described sliding tray is limited on boss III.
In above-mentioned a kind of cloth pressing foot, described body is made up of POM composite, and described POM composite becomes to be grouped into primarily of following mass percent: flexibilizer: 8-15%, kollag: 8-15%, reinforcing fiber: 5-10%, formaldehyde absorbent: 0.1-0.5%, surplus are POM.
POM is commonly called as match steel or takes steel by force, and have the Rockwell hardness of metalloid, intensity and rigidity, smooth surface, coefficient of friction is little, noiselessness, and self lubricity, creep-resistant property, good stability of the dimension, fatigue durability and anti-wear performance are all better.But common POM composite can only use under the condition of low speed, underload, and due to the degree of crystallinity of POM higher (generally reaching 75-85%), crystal grain is large, causes its impact flexibility low, often ruptures in a brittle manner.In order to requirement of the present invention can be adapted to, the present invention carries out blending and modifying by adding the modifier such as flexibilizer, kollag, reinforcing fiber, formaldehyde absorbent in above-mentioned formula to it, effectively improves the mechanical property such as ABRASION RESISTANCE, toughness, intensity of POM composite.
Wherein, described flexibilizer is mainly thermoplastic polyurethane, acrylonitrile-butadiene rubber, EP rubbers, TPU/nano-SiO
2, TPU/nano-CaCO
3in one or more.The TENSILE STRENGTH of POM composite, elastic modelling quantity, notch impact strength can be made add above-mentioned flexibilizer in POM after to be greatly improved, effectively to improve the toughness of POM composite.
Kollag is mainly PTFE powder, powdered graphite, MoS
2one or more in powder, the particle diameter of described kollag is 10-200 μm.In POM, the above-mentioned kollag of filling not only can improve its tribological property, can also strengthen the ABRASION RESISTANCE of POM.In consumption, add the above-mentioned lubricant of 2-5% in POM composite after, the friction factor of POM composite can be made to reduce about 60%, and abrasion resistance properties improves 1-2 doubly, continue to increase consumption, the tribological property of POM composite and abrasion resistance properties improve and continue to increase; But, the mechanical property the adding of above-mentioned lubricant making POM composite and processing characteristics deterioration.Therefore, according to the combined influence of above-mentioned lubricant to POM composite, its consumption controls within the scope of 8-15% by the present invention.
Reinforcing fiber be mainly in glass fibre, carbon fiber, aramid fiber one or more; The diameter of described reinforcing fiber is 10-50 μm, and draw ratio is (15-25): 1.The reinforcing fiber added in amount ranges of the present invention can improve the intensity of POM composite, rigidity reduce its volume change.And the reinforcing fiber added within the scope of above-mentioned diameter, draw ratio can improve the ABRASION RESISTANCE of POM composite.
Formaldehyde absorbent be mainly in melamine, dicyandiamide, polyamide, polyurethane one or more.POM is poor heat stability under forming temperature, releasing formaldehyde gas of degrading, and therefore, adds the formaldehyde absorbent of above-mentioned mass percent when granulation, can improve its stability.
The body of cloth pressing foot of the present invention adopts the rational POM composite of above-mentioned compatibility to make, and quality is light, and density only has 1.4g/cm
3left and right, want light a lot, but the performances such as its intensity, hardness and rigidity is but close with metal body, even higher with prior art compared with the body adopting metal material to make.And the advantage such as the cloth pressing foot body that the present invention adopts POM composite to make has smooth surface, self-lubricating is acted charitably, noiselessness, coefficient of friction are little, ABRASION RESISTANCE is strong, good dimension stability, metal material can be replaced completely to prepare cloth pressing foot body of the present invention.Moreover, consider from the sustainable development of resource, the present invention adopts POM composite to prepare cloth pressing foot body and also has very important significance and market prospects.
In above-mentioned a kind of cloth pressing foot, the preparation method of described body comprises the following steps:
S1, take raw material by the constituent of above-mentioned body and mass percent thereof, polyformaldehyde is placed on the drying baker inner drying 2-4 hour that temperature is 60-80 DEG C;
S2, above-mentioned dried POM to be mixed with other raw materials, add in double screw extruder, extrude from the head of double screw extruder, obtain pellet by granulator granulation;
S3, to add pellet obtained above after drying in high-speed injection molding machine barrel, be heated to molten condition, then by the raw material of molten condition through nozzle injection in mould, obtain body through pressurize, cooling forming, die sinking.
It is simple that the present invention adopts POM composite to prepare the technique of cloth pressing foot body, can one-shot forming, good integrity; And adopt metal material to prepare compared with cloth pressing foot body with prior art, do not need to carry out metalworking technique, saved the cost of equipment such as manufacturing procedure and process tool greatly, cost is low, and the cycle is short, and economic effect is given prominence to.
Wherein, the temperature of double screw extruder described in step S2 controls at 170-190 DEG C, and screw speed is 100-120r/min.
Drying condition described in step S3 is vacuumize 6-10h at 60-80 DEG C, and nozzle temperature is 200-230 DEG C, and mold temperature is 70-100 DEG C, expulsion pressure is 50-80MPa, and jet velocity is 40-70mm/s, and dwell pressure is 30-60MPa, dwell time is 10-20s, and cool time is 20-40s.
In above-mentioned a kind of cloth pressing foot, described noumenal seat is made up of the triangular portion be connected and rectangular portion, junction between triangular portion and rectangular portion offer arc groove and arc groove be connected on the lower surface of body, offer elongated hole in rectangular portion center.The location to this cloth pressing foot can be completed, the method registration by elongated hole and pin hole, simple to operate.
In above-mentioned a kind of cloth pressing foot, described noumenal seat is made up of PC material.PC material water white transparency, density only has 1.2g/cm
3left and right, quality is light, but it has very high toughness, rigidity, intensity, and Izod notched impact strength can reach more than 900J/m, and bending modulus can reach more than 2400MPa; And it is good to have fatigue durability, dimensionally stable, creep is also little, the mechanical properties such as good weatherability.The present invention adopts PC material to prepare noumenal seat, adopt metal material to prepare compared with noumenal seat with prior art, quality is light, but the mechanical properties such as intensity are close, preparation technology is simple, can one-shot forming, good integrity, does not need to carry out metalworking technique, save the cost of equipment such as manufacturing procedure and process tool greatly, cost is low, and the cycle is short, and economic effect is given prominence to.
In above-mentioned a kind of cloth pressing foot, the rectangular tabular of described cover plate, described cover plate both sides downward bending is formed with guide plate and grapple, sliding tray is opened on guide plate, grapple is in " J " font and perpendicular to control stick axis, cover plate one end is provided with connecting portion, and connecting portion is perpendicular to cover plate and grapple and be connected on control stick.In product reciprocating motion, back-up ring promotes spring, compresses spring; Spring promotes back-up ring until back-up ring is resisted against on boss II, and in reciprocating motion, guide plate suits mutually with boss III, and boss III controls and regulates the reciprocating direction of product, and this structure has the high and simple advantage of structure of working stability, accuracy.
In above-mentioned a kind of cloth pressing foot, described control stick and cover plate are made up of metal material.
In above-mentioned a kind of cloth pressing foot, described control stick and cover plate are made up of 45# steel.45# steel has higher intensity and good machinability, can obtain certain toughness, plasticity and ABRASION RESISTANCE after suitable heat treatment, and material source is convenient.Control stick of the present invention and the preferred 45# steel of cover plate are made, and promote cover plate and move under the effect of external force, and cover plate drives control stick to move by connecting portion, and then promote spring-compressed by the back-up ring be connected on control stick, during counter motion, spring promotes back-up ring, realizes the reverse movement of control stick.In forward and reverse motion process, between the body that the control stick that 45# steel is made and cover plate and POM composite are made, friction, capability reduces obviously, and resistance to grinding capacity significantly improves, and is also obviously reduced by fricative noise during forward and reverse fortune merit.
Compared with prior art, the present invention has following advantage:
1, adopt spring structure to instead of the mechanisms such as existing crawler type, processing technology requires lower, and structure is simple.
2, the side of cover plate offers sliding tray, sliding tray and the 3rd limits, cover plate is carried out spacing while, ensure that the reciprocating stability of control stick, improve machining accuracy.
3, in process, between control stick and cover plate, wear and tear between control stick and body very little, thus improve the service life of cloth pressing foot.
4, cloth pressing foot body of the present invention adopts POM composite to make, noumenal seat adopts PC material to make, control stick in Dan Hua mechanism and cover plate adopt 45# steel to make, and the cloth pressing foot overall weight made like this reduces a lot, but the mechanical properties such as intensity, rigidity, hardness do not reduce.
5, the POM composite compatibility of cloth pressing foot body employing of the present invention is reasonable, with the addition of the modifier such as flexibilizer, kollag, reinforcing fiber, formaldehyde absorbent and blending and modifying is carried out to it, effectively improve the mechanical property such as ABRASION RESISTANCE, toughness, intensity of POM composite.
6, cloth pressing foot body of the present invention adopts POM composite to make, noumenal seat adopts PC material to make, adopt compared with prepared by metal material with prior art, do not need to carry out metalworking technique, saved the cost of equipment such as manufacturing procedure and process tool greatly, and preparation technology is simple, can one-shot forming, good integrity, cost is low, cycle is short, and economic effect is given prominence to.
7, Dan Hua mechanism of the present invention is in forward and reverse motion process, between the body that the control stick that 45# steel is made and cover plate and POM composite are made, friction, capability reduces obviously, resistance to grinding capacity significantly improves, and is also obviously reduced by fricative noise during forward and reverse fortune merit.
Accompanying drawing explanation
Fig. 1 is the structural representation of this cloth pressing foot.
Fig. 2 is the structural representation at another visual angle of this cloth pressing foot.
In figure, 1, body; 11, upper surface; 111, boss I; 112, boss II; 12, lower surface; 121, support column; 121a, pin hole; 13, side; 131, boss III; 2, noumenal seat; 21, boss IV; 221, elongated hole; 3, Dan Hua mechanism; 31, control stick; 311, back-up ring; 32, cover plate; 321, guide plate; 321a, sliding tray; 322, grapple; 323, connecting portion; 33, spring.
Detailed description of the invention
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As depicted in figs. 1 and 2, in the preferred embodiment, cloth pressing foot comprises body 1, noumenal seat 2 and Dan Hua mechanism 3, body 1 is provided with boss I 111 and boss II 112, boss I 111 and boss II 112 all offer through hole, Dan Hua mechanism 3 comprises control stick 31, cover plate 32 and spring 33, control stick 31 is fixed with back-up ring 311, control stick 31 one end is fed through the two through hole on body 1, the other end is connected by connecting portion 323 and cover plate 32, control stick 31 is arranged with spring 33, spring 33 is between boss I 111 and boss II 112, when product offers the course of work, body 1 is located by external device, because cover plate 32 is fixedly connected with control stick 31, under mechanically operated effect, cover plate 32 and control stick 31 synchronizing moving, spring 33 is under the effect of back-up ring 311, start compressed action, when product starts counter motion, spring 33 starts small spring action, and spring 33 promotes back-up ring 311 counter motion, and then drives control stick 31 oppositely movement, and the cover plate 32 be connected with control stick 31 realizes reverse slide, completes processing action.
As depicted in figs. 1 and 2, body 1 is elongated, by upper surface, composition is surrounded in lower surface and side, upper surface 11 vertically protrude be formed boss I 111 with boss II 112 and on the side 13 of body 1 vertical protrusion be formed with boss III 131, boss I 111 and boss II 112 all offer the through hole of concentric, one end of lower surface 12 is vertically outstanding is formed with support column 121, boss II 112 is between boss I 111 and support column 121, support column 121 offers pin hole 121a, pin hole 121a is through body 1 upper surface 11 and lower surface 12, the diameter of pin hole 121a reduces from down to up gradually.Support column 121 and body 1 are integrated, and well can keep the stationarity of product, and the pin hole 121a that support column 121 is offered, while realizing product section location, ensures the stable of product, improves accuracy and the high efficiency of processing.
As depicted in figs. 1 and 2, noumenal seat 2 is made up of transparent PC material, be made up of the triangular portion be connected and rectangular portion and be made up of transparent PC material, junction between triangular portion and rectangular portion offer arc groove and arc groove be connected on the lower surface of body, elongated hole is offered in rectangular portion center, the location to this cloth pressing foot can be completed, the method registration by elongated hole 211 and pin hole 121a, simple to operate; The lower surface 12 of the arc groove that noumenal seat 2 is offered and body is tangent, facilitates user installation and fixed body 1.
As depicted in figs. 1 and 2, Dan Hua mechanism 3, be arranged on the upper surface 11 of body 1, comprise control stick 31, cover plate 32 and spring 33, one end of control stick 31 is passed and is given prominence to boss I 111 and boss II 112 through hole, control stick 31 is fixed with back-up ring 311, control stick 31 is arranged with spring 33 and spring 33 one end is resisted against on boss I 111, the other end is resisted against on back-up ring 311, back-up ring 311 can be resisted against on boss II 112, the other end of control stick 31 is fixed with cover plate 32, the rectangular tabular of described cover plate 32, described cover plate 32 both sides downward bending forms guide plate 321 and grapple 322, sliding tray is opened on guide plate 321, grapple 322 is in " J " font and perpendicular to control stick 31 axis, the end of cover plate 32 is provided with connecting portion 323, connecting portion 323 is perpendicular to cover plate 32 and grapple 322 and be connected on control stick 31, promote spring 33 by back-up ring 311 and realize reciprocating motion, structure is simple, versatility is stronger, on noumenal seat, 2 offer elongated hole 321.
In the course of work, the movement of cover plate 32 is promoted under mechanically operated effect, cover plate 32 drives control stick 31 to move by connecting portion 323, and then the compression of spring 33 is promoted by the back-up ring 311 be connected on control stick 31, during counter motion, spring 33 promotes back-up ring 311, and then realizes the reverse movement of control stick 31.
Further preferably, back-up ring 311 is greater than the length of boss I 111 and boss II 112 with the length of connecting portion 323, prevents connecting portion 323 in process from directly contacting with boss I 111 outer surface, while reducing wear, improves kinematic dexterity.
The present invention in an initial condition, extraneous drive unit is connected with the grapple 322 of product, when starting action, be driven through grapple 322 and drive cover plate 32 to move, cover plate 32 and control stick 31 are connected, and then drive moving axially of control stick 31, the back-up ring 311 that control stick 31 is connected starts Compress Spring 33, and product does rectilinear motion, until start release, now spring 33 is in compressive state, and the guide plate 321 that cover plate 32 is arranged can control and regulate the direction that product moves, during counter motion, spring 33 stretching motion, promote back-up ring 311 counter motion, and then promote control stick 31 counter motion, the cover plate 32 be connected with control stick 31 does straight line counter motion under the control of guide plate 321, until back-up ring 311 is resisted against on boss II 112, in this structure, by being arranged on the spring 33 between boss I 111 and boss II 112, and spring 33 one end is resisted against on back-up ring 311 that control stick 31 is connected, realize the reciprocating motion of control stick 31, the side of cover plate 32 offers sliding tray 321a, sliding tray 321a is by the restriction with boss III 111, strengthen the stability of cloth pressing foot in motion process and accuracy, the structure that the present invention just coordinates with back-up ring 31 with this spring 33, substantially increase the versatility of product, and structure is simple, easy to operate.
Wherein, above-mentioned cloth pressing foot body 1 is made up of POM composite, and POM composite becomes to be grouped into primarily of following mass percent: flexibilizer: 8-15%, kollag: 8-15%, reinforcing fiber: 5-10%, formaldehyde absorbent: 0.1-0.5%, surplus are POM.
Table 1: the constituent of embodiment of the present invention 1-4 cloth pressing foot body and mass percent thereof
Embodiment 1:
Take raw material by the constituent of embodiment in table 11 cloth pressing foot body and mass percent thereof, in raw material, the particle diameter of kollag is 10-50 μm, and the diameter of reinforcing fiber is 10-20 μm, and draw ratio is 15:1.Polyformaldehyde in raw material is placed on the drying baker inner drying 4 hours that temperature is 60 DEG C.Then mixed with other raw materials by dried POM, add in double screw extruder, the temperature of double screw extruder controls at 170-190 DEG C, and screw speed is 100r/min, extrudes, then obtain pellet by granulator granulation from the head of double screw extruder.
By the pellet vacuumize 10h at 60 DEG C obtained, then add in the barrel in high-speed injection molding machine, be heated to molten condition, then by the raw material of molten condition through excess temperature be the nozzle of 200 DEG C at 50MPa injected under pressure in mould, mould is heated to 70 DEG C in advance, and jet velocity is 40mm/s.Finally pressurize 20s under 30MPa pressure, cooling 20s is shaping, die sinking obtains body.
Embodiment 2:
Take raw material by the constituent of embodiment in table 12 cloth pressing foot body and mass percent thereof, in raw material, the particle diameter of kollag is 50-100 μm, and the diameter of reinforcing fiber is 20-30 μm, and draw ratio is 20:1.Polyformaldehyde in raw material is placed on the drying baker inner drying 3 hours that temperature is 70 DEG C.Then mixed with other raw materials by dried POM, add in double screw extruder, the temperature of double screw extruder controls at 170-190 DEG C, and screw speed is 110r/min, extrudes, then obtain pellet by granulator granulation from the head of double screw extruder.
By the pellet vacuumize 8h at 70 DEG C obtained, then add in the barrel in high-speed injection molding machine, be heated to molten condition, then by the raw material of molten condition through excess temperature be the nozzle of 210 DEG C at 60MPa injected under pressure in mould, mould is heated to 80 DEG C in advance, and jet velocity is 50mm/s.Finally pressurize 15s under 40MPa pressure, cooling 30s is shaping, die sinking obtains body.
Embodiment 3:
Take raw material by the constituent of embodiment in table 13 cloth pressing foot body and mass percent thereof, in raw material, the particle diameter of kollag is 100-150 μm, and the diameter of reinforcing fiber is 30-40 μm, and draw ratio is 22:1.Polyformaldehyde in raw material is placed on the drying baker inner drying 3 hours that temperature is 75 DEG C.Then mixed with other raw materials by dried POM, add in double screw extruder, the temperature of double screw extruder controls at 170-190 DEG C, and screw speed is 115r/min, extrudes, then obtain pellet by granulator granulation from the head of double screw extruder.
By the pellet vacuumize 7h at 70 DEG C obtained, then add in the barrel in high-speed injection molding machine, be heated to molten condition, then by the raw material of molten condition through excess temperature be the nozzle of 220 DEG C at 70MPa injected under pressure in mould, mould is heated to 90 DEG C in advance, and jet velocity is 60mm/s.Finally pressurize 12s under 50MPa pressure, cooling 35s is shaping, die sinking obtains body.
Embodiment 4:
Take raw material by the constituent of embodiment in table 14 cloth pressing foot body and mass percent thereof, in raw material, the particle diameter of kollag is 150-200 μm, and the diameter of reinforcing fiber is 40-50 μm, and draw ratio is 25:1.Polyformaldehyde in raw material is placed on the drying baker inner drying 2 hours that temperature is 80 DEG C.Then mixed with other raw materials by dried POM, add in double screw extruder, the temperature of double screw extruder controls at 170-190 DEG C, and screw speed is 120r/min, extrudes, then obtain pellet by granulator granulation from the head of double screw extruder.
By the pellet vacuumize 6h at 80 DEG C obtained, then add in the barrel in high-speed injection molding machine, be heated to molten condition, then by the raw material of molten condition through excess temperature be the nozzle of 230 DEG C at 80MPa injected under pressure in mould, mould is heated to 100 DEG C in advance, and jet velocity is 70mm/s.Finally pressurize 10s under 60MPa pressure, cooling 40s is shaping, die sinking obtains body.
The cloth pressing foot body that embodiment of the present invention 1-4 is obtained carries out performance test, and test result is as shown in table 2.
The performance test results of the cloth pressing foot body that table 2: embodiment of the present invention 1-4 obtains
As known from Table 2, the better performances such as hardness, intensity, rigidity of the cloth pressing foot body that POM composite of the present invention is made, the cloth pressing foot bulk properties made with metal material is very nearly the same.And the cloth pressing foot body that POM composite of the present invention is made also possesses the advantages such as quality is light, smooth surface, self lubricity are good, noiselessness, coefficient of friction are little, ABRASION RESISTANCE is strong, good dimension stability, and preparation technology is simple, cost is low, the cycle is short, metal material can be replaced completely to prepare cloth pressing foot body of the present invention.
Application Example:
Choose arbitrarily cloth pressing foot body obtained in above-described embodiment 1-4, with Dan Hua mechanism and noumenal seat assembly cost invention cloth pressing foot; Wherein, noumenal seat adopts prior art to make by PC material, and the cover plate in Dan Hua mechanism and control stick adopt prior art to make by metal material, and the present invention is preferably made up of 45# steel.
Comparative example:
The commercially available cloth pressing foot be made up of metal material.
Compared by the cloth pressing foot of Application Example and comparative example, comparative result is as shown in table 3.
Table 3: the comparative result of Application Example and comparative example cloth pressing foot
As known from Table 3, the present invention adopts plastics and metal material to combine to prepare cloth pressing foot, and reasonable in design; Compared with the cloth pressing foot of prior art, there is clear superiority in above-mentioned everyway, and cloth pressing foot of the present invention progressively will replace commercially available common cloth pressing foot becomes the market mainstream.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (8)
1. a cloth pressing foot, is characterized in that, comprises
Body, described body is elongated, on the upper surface of body vertical protrude be formed boss I with boss II and on the side of body vertical protrusion be formed with boss III, boss I and boss II all offer the through hole of concentric, give prominence to vertically downward in one end of the lower surface of body and be formed with support column, boss II, between boss I and support column, described support column offers and runs through the upper surface of body and the pin hole of lower surface;
Noumenal seat, is vertically connected in the other end of body lower surface;
Dan Hua mechanism, be arranged on the upper surface of body, comprise control stick, cover plate and spring, the through hole be opened on boss I and boss II is run through in one end of described control stick, control stick is fixed with back-up ring and back-up ring can be resisted against on boss II when action bars moves axially, control stick is arranged with spring and spring one end is resisted against on boss I, the other end is resisted against on back-up ring, the other end of described control stick is fixed with cover plate, be provided with sliding tray in the side of cover plate, described sliding tray is limited on boss III.
2. a kind of cloth pressing foot according to claim 1, it is characterized in that, described body is made up of POM composite, and described POM composite becomes to be grouped into primarily of following mass percent: flexibilizer: 8-15%, kollag: 8-15%, reinforcing fiber: 5-10%, formaldehyde absorbent: 0.1-0.5%, surplus are POM.
3. a kind of cloth pressing foot according to claim 2, is characterized in that, the preparation method of described body comprises the following steps:
S1, take raw material by the constituent of body according to claim 2 and mass percent thereof, polyformaldehyde is placed on the drying baker inner drying 2-4 hour that temperature is 60-80 DEG C;
S2, above-mentioned dried POM to be mixed with other raw materials, add in double screw extruder, extrude from the head of double screw extruder, obtain pellet by granulator granulation;
S3, to add pellet obtained above after drying in high-speed injection molding machine barrel, be heated to molten condition, then by the raw material of molten condition through nozzle injection in mould, obtain body through pressurize, cooling forming, die sinking.
4. a kind of cloth pressing foot according to claim 1, it is characterized in that, described noumenal seat is made up of the triangular portion be connected and rectangular portion, junction between triangular portion and rectangular portion offer arc groove and arc groove be connected on the lower surface of body, offer elongated hole in rectangular portion center.
5. a kind of cloth pressing foot according to claim 4, is characterized in that, described noumenal seat is made up of PC material.
6. a kind of cloth pressing foot according to claim 1, it is characterized in that, the rectangular tabular of described cover plate, described cover plate both sides downward bending is formed with guide plate and grapple, sliding tray is opened on guide plate, grapple is in " J " font and perpendicular to control stick axis, cover plate one end is provided with connecting portion, and connecting portion is perpendicular to cover plate and grapple and be connected on control stick.
7. a kind of cloth pressing foot according to claim 6, is characterized in that, described control stick and cover plate are made up of metal material.
8. a kind of cloth pressing foot according to claim 7, is characterized in that, described control stick and cover plate are made up of 45# steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410449415.7A CN104294487B (en) | 2014-09-04 | 2014-09-04 | A kind of cloth pressing foot |
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| US7134223B2 (en) * | 2002-07-23 | 2006-11-14 | Sewing Innovations And Machine Co. | Elastomeric sole for use with converted flatbed sewing machine |
| CN101210364A (en) * | 2006-12-28 | 2008-07-02 | 大和缝纫机制造株式会社 | Sewing machine presser foot |
| CN201588071U (en) * | 2010-01-13 | 2010-09-22 | 麻佰林 | Novel special tacking machine |
| CN202273071U (en) * | 2011-09-28 | 2012-06-13 | 吴江市润蕾纺织品有限公司 | Cloth presser foot |
| CN203625634U (en) * | 2013-12-06 | 2014-06-04 | 际华三五三四制衣有限公司 | Adjustable presser foot for lockstitch sewing machine |
| CN204097704U (en) * | 2014-09-04 | 2015-01-14 | 宁波瑞铭机械有限公司 | A kind of cloth pressing foot |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101372794B (en) * | 2008-10-16 | 2011-12-07 | 上海贵衣缝纫设备有限公司 | Adjustment mechanism for presser foot for connection in pattern machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7134223B2 (en) * | 2002-07-23 | 2006-11-14 | Sewing Innovations And Machine Co. | Elastomeric sole for use with converted flatbed sewing machine |
| CN101210364A (en) * | 2006-12-28 | 2008-07-02 | 大和缝纫机制造株式会社 | Sewing machine presser foot |
| CN201588071U (en) * | 2010-01-13 | 2010-09-22 | 麻佰林 | Novel special tacking machine |
| CN202273071U (en) * | 2011-09-28 | 2012-06-13 | 吴江市润蕾纺织品有限公司 | Cloth presser foot |
| CN203625634U (en) * | 2013-12-06 | 2014-06-04 | 际华三五三四制衣有限公司 | Adjustable presser foot for lockstitch sewing machine |
| CN204097704U (en) * | 2014-09-04 | 2015-01-14 | 宁波瑞铭机械有限公司 | A kind of cloth pressing foot |
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| CN104294487B (en) | 2016-09-07 |
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