CN105004366A - Needle bar on-line vibration and bending measuring device - Google Patents
Needle bar on-line vibration and bending measuring device Download PDFInfo
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- CN105004366A CN105004366A CN201510235845.3A CN201510235845A CN105004366A CN 105004366 A CN105004366 A CN 105004366A CN 201510235845 A CN201510235845 A CN 201510235845A CN 105004366 A CN105004366 A CN 105004366A
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Abstract
The present invention discloses a needle bar on-line vibration and bending measuring device. The needle bar on-line vibration and bending measuring device comprises a bending sensor, a distortion sensor, a bending and distortion sensor, two acceleration sensors, an encoder and the like. A needle bar motion direction sensor and a needle bar transverse acceleration sensor are both arranged on a measurement base of a needle bar, the bending sensor and the distortion sensor are arranged on a cylindrical wall of the needle bar, and the bending and distortion sensor is arranged on a chute outer wall. The encoder is arranged on a gear pair of an upper shaft of a sewing machine, and the bending sensor, the distortion sensor and the bending and distortion sensor are all connected with a signal analyzer via a signal acquisition amplifier. The two acceleration sensors are connected with the signal analyzer via the load amplifiers respectively, the encoder is connected with the signal analyzer via a control panel, the control panel is connected with the signal acquisition amplifier, and the signal analyzer is connected with a display screen. According to the present invention, the dynamic data during the operation of the needle bar is obtained by measurement, the basis is provided for the needle bar mechanism design and improvement of a high-speed sewing machine, and the redundant distortion and bending during the movement of the needle bar are reduced as much as possible.
Description
Technical field
The present invention relates to a kind of shank pick-up unit of Yarn taking-up mechanism, be applied in the measuring technique of template sewing machine, be specifically related to a kind of shank on-line vibration and flexural measurement device.
Background technology
The trend of modern industry sewing machine high speed development is bright and clear, and constantly speed-raising causes the wearing and tearing of each mechanism kinematic rod member of sewing machine to aggravate, and brings the more fault of sewing machine.In the needle bar mechanism of sewing machine, shank is reciprocating, and shank has one section of accurate quiescent phase in minimum and extreme higher position, and the shank transverse vibration in motion is very large.
Needle bar mechanism is arranged on template sewing machine between axle and shank, is the main source of template sewing machine vibration & noise.Needle bar mechanism converts the to-and-fro movement of shank to the gyration of upper axle, and template sewing machine is combined into one the crank of needle bar mechanism and Yarn taking-up mechanism, the motion of the significantly serious vibration interference shank of thread take-up tension lever, aggravation pin vibration of bar.
Shank is reciprocating, and the design of shank motion does not limit the rotation of shank, but reaches in the to-and-fro movement of chute the object limiting shank and rotate by slide block through slider pin, causes the distortion of chute, slider pin and shank like this.And sewing thread is through the pinprick of eedle, stitch tension action direction and shank direction of motion space intersection, therefore the feature of shank motion there is flexural vibrations, torsional vibration, and all there is vibration in direction of motion with perpendicular to direction of motion, these vibrations are unnecessary and harmful.
The shank vibration of four bar needle bar mechanisms is strong especially, the especially transverse vibration of shank, and what eedle stung out on sewing is not a point, but a circle, show that the track of eedle when stinging material is an irregular circle.Nowadays high-speed industrial machine rotating speed is high, and the in use maximum problem of needle bar mechanism is that vibration is large, and the excessive and vibration that is eedle of tension force of facial suture causes the crooked and fault of needle tracking.Produce violent oscillatory motion in the transverse direction of shank motion, therefore need to measure the transverse vibration of shank and bending, measure and be turned back to which angle at upper axle and occur bending, the maximum vibration that shank is maximum, measurement data is an important element task.
The dynamic bending of shank can be obtained by the measurement of foil gauge group, the vibrational state of shank is recorded by acceleration transducer, just correctly can understand the force and deformation state of shank from the deflection of shank and the measured data of vibratory output, judge that whether the thorn material course of work is normal by data.
Summary of the invention
In order to meet the demand, the present invention aims to provide a kind of shank on-line vibration and flexural measurement device, obtaining the operating dynamic data of shank by measuring, for the needle bar mechanism design improvement of high speed sewing machine provides basis, reducing distortion unnecessary in shank motion as far as possible with bending.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of shank on-line vibration and flexural measurement device, comprise bend sensor, twist sensors, bending sensor, Signal Collection and amplify device, the first acceleration transducer, the second acceleration transducer, the first load amplifier, the second load amplifier, scrambler, control panel and signal analyzer; Described first acceleration transducer and described second acceleration transducer are separately positioned on the first measuring seat on shank and the second measuring seat, described bend sensor and described twist sensors are separately positioned on the cylinder outer wall of described shank, described bending sensor setting is on the lateral wall of chute, and described scrambler is arranged on the gear pair of axle on sewing machine;
Described bend sensor, described twist sensors are all connected with described signal analyzer by described Signal Collection and amplify device with described bending sensor; Described first acceleration transducer, described second acceleration transducer are connected with described signal analyzer respectively by described first load amplifier, described second load amplifier; Described scrambler connects described control panel, and described control panel one tunnel is directly connected with described signal analyzer, and another road is connected with described signal analyzer through described Signal Collection and amplify device, and described signal analyzer is connected with a display screen.
Further, described bend sensor pastes the side of the cylinder outer wall of described shank, and between described slider pin and described lower sleeve; Described bend sensor is made up of a slice first copper sheet and four first foil gauges be pasted onto on described first copper sheet, the stickup direction of described four first foil gauges and described shank axis parallel.
Further, described twist sensors pastes the opposite side of the cylinder outer wall of described shank, and between described slider pin and described lower sleeve; Described twist sensors is made up of a slice second copper sheet and four second foil gauges be pasted onto on described second copper sheet, and the stickup direction of described four second foil gauges becomes 45o angle with described shank axial line.
Further, described bending sensor is pasted onto on the lateral wall of described chute, described bending sensor is made up of a slice the 3rd copper sheet and eight the 3rd foil gauges be pasted onto on described 3rd copper sheet, wherein the stickup direction of four described 3rd foil gauges is parallel with described slide block movement direction, measure the flexural deformation of chute, the stickup direction of another four described 3rd foil gauges becomes 45o angle with described slide block movement direction, measures the torsional deformation of chute.
Further, described first measuring seat is made up of the first axle sleeve and " one " font support plate, and described first axle sleeve is set on the cylinder outer wall of described shank, and between described slider pin and described lower sleeve; The outer panel face of described " one " font support plate and described shank axis parallel, the interior plate face of described " one " font support plate is fixedly connected with described first measuring seat, and described first acceleration transducer is adsorbed on the outer panel face of described " one " font support plate.
Further, described second measuring seat is made up of the second axle sleeve and horizontal " T " font support plate, and described second axle sleeve is set on the cylinder outer wall of described shank, and between described slider pin and described lower sleeve; The sensor installed surface of the left supported plate of described " T " font support plate and described shank axis parallel, the right supported plate of described " T " font support plate is vertical with described shank axial line; The left supported plate of described " T " font support plate is fixedly connected with described first measuring seat, and described second acceleration transducer is adsorbed on the right supported plate of described " T " font support plate.
Further, electric bridge, transmitter, signal recognition device and signal amplifier is comprised in described Signal Collection and amplify device, described electric bridge is respectively described bend sensor, described twist sensors and described bending sensor power, and described bend sensor, described twist sensors are connected with described signal recognition device through described transmitter respectively with described bending sensor; Described scrambler and described control panel composition clock signal control device, described scrambler is connected with described signal recognition device through described control panel; Described signal recognition device is connected with described signal analyzer through described signal amplifier.Scrambler produces the pivotal angle signal of axle on sewing machine, and output signal entering signal collection amplifier and the signal analyzer respectively of control panel, controls record and the display timing generator of each signal.
Beneficial effect of the present invention is as follows:
The present invention is that sewing machine provides a kind of measure measuring shank, chute bending and vibrational state, utilizes bridge-type foil gauge principle to measure the bending of shank and chute, from two orientation measurement shank vibrational states.The shank vibration that dynamic loading is brought and bending distortion and the damage causing the another part of needle bar mechanism, the operating dynamic data of shank is obtained by measuring, for the needle bar mechanism design improvement of high speed sewing machine provides basis, reduce distortion unnecessary in motion as far as possible and bend.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, coordinates accompanying drawing to describe in detail below with preferred embodiment of the present invention.The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is one-piece construction block diagram of the present invention;
Fig. 2 is structure and the scheme of installation of shank;
Fig. 3 is the installation site schematic diagram of the present invention first acceleration transducer on shank;
Fig. 4 is the installation site schematic diagram of the present invention second acceleration transducer on shank;
Fig. 5 is the front view of the present invention first measuring seat;
Fig. 6 is the vertical view of the present invention first measuring seat;
Fig. 7 is the front view of the present invention second measuring seat;
Fig. 8 is the vertical view of the present invention second measuring seat;
Fig. 9 is bend sensor of the present invention and the installation site schematic diagram of twist sensors on shank;
Figure 10 is the structural representation of bend sensor of the present invention;
Figure 11 is the structural representation of twist sensors of the present invention;
Figure 12 is the left view of the installation site of bending sensor on chute of the present invention;
Figure 13 is the upward view of the installation site of bending sensor on chute of the present invention;
Figure 14 is the structural representation of bending sensor of the present invention;
Figure 15 is the work block diagram of shank measurement of distortion and flexure signal of the present invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Shown in Figure 1, a kind of shank on-line vibration and flexural measurement device, comprise bend sensor 1, twist sensors 2, bending sensor 3, Signal Collection and amplify device 4, first acceleration transducer 5, second acceleration transducer 6, first load amplifier 8, second load amplifier 9, scrambler 11, control panel 12 and signal analyzer 13; Described first acceleration transducer 5 and described second acceleration transducer 6 are separately positioned on the first measuring seat 7 on shank 15 and the second measuring seat 10, described bend sensor 1 and described twist sensors 2 are separately positioned on the cylinder outer wall of described shank 15, described bending sensor 3 is arranged on the lateral wall of chute 20, and described scrambler 11 is arranged on the gear pair 18 of axle 17 on sewing machine;
Described bend sensor 1, described twist sensors 2 are all connected with described signal analyzer 13 by described Signal Collection and amplify device 4 with described bending sensor 3; Described first acceleration transducer 5, described second acceleration transducer 6 are connected with described signal analyzer 13 respectively by described first load amplifier 8, described second load amplifier 9; Described scrambler 11 connects described control panel 12, and described control panel 12 1 tunnel is directly connected with described signal analyzer 13, and another road is connected with described signal analyzer 13 through described Signal Collection and amplify device 4, and described signal analyzer 13 is connected with a display screen 19.
Shown in Figure 2, shank 15 is in cylinder type, and drum diameter is 8 millimeters, and length is 185 millimeters, and cylinder medium-length hole intracavity diameter is 5.6 millimeters.Bottom geared head top 24 and geared head, 25 have the hole that diameter is 12 millimeters, are separately installed with upper bush 22 and lower sleeve 19 in upper and lower hole, and shank 15 moves coordinate with upper bush 22, lower sleeve 19, and shank 15 slides in upper bush 22 and lower sleeve 19.
Participate in shown in Fig. 3, Fig. 4, Fig. 3 represents the first installation site of acceleration transducer 5 on shank 15, and Fig. 4 represents the second installation site of acceleration transducer 6 on shank 15, and these two measuring points are all selected between slider pin 16 on shank 15 and lower sleeve 19.The moving component of needle bar mechanism is made up of jointly shank 15 and slide block 21, and slide block 21 synchronously moves up and down with shank 15 in chute 20, the rotation of shank 15 of the movement limit of slide block 21.Shank 15 is driven by connecting rod 23, and connecting rod 23 drives moving up and down of shank 15 and slide block 21 through slider pin 16, connecting rod 23, slide block 21 and three, shank 15 office plane.This needle bar mechanism is used on high speed sewing machine, adds the interference between the motion of each component, causes shaking by force of shank.
The Part I that the present invention measures is surveyingpin vibration of bar, and the feature of vibration-testing signal is as follows:
1) measuring object is the accelerating curve of shank, is time-domain curve;
2) signal is periodic signal;
3) use piezoelectric acceleration sensor, accelerometer be the most reliable, purposes the most extensively, the most accurate vibration transducer, the precision of acceleration test signal is high, and contained by acceleration signal, information is the abundantest.
The travelling speed of sewing machine is within the scope of 22-90HZ, and shank lateral vibration is very strong, thus eedle pricks on cloth under pinprick be not a hole, a but round eye, justify the diameter of eye diameter much larger than eedle, shank running environment is very poor.
Shown in Figure 4, shank 15, connecting rod 23 be not at same plane, the shank 15 that quality is large is work rod members, shank 15 high-speed motion produces distortion power to connecting rod 23, adopt the degree of freedom that slide block 21 moves along the movement of chute 20 limit shank 15, but the motional inertia of slide block 21 is much smaller than the motional inertia of shank 15, and chute 20 is located and is only leaned on two screws, be difficult to the depth of parallelism ensureing chute 20 and shank 15, the result of motion causes the high vibration of shank 15.
Shank moves in vertical direction, and the feature of shank motion exists strong vibration perpendicular in direction of motion, therefore measures shank acceleration, needs measurement two directions.The acceleration of shank direction of motion and the transverse vibration of shank is measured respectively with two acceleration transducers.
Shown in Figure 3, the first measuring point direction of measurement is selected in shank 15 direction of axis line, the i.e. direction of motion of shank.Shown in Fig. 5,6, described first measuring seat 7 is made up of the first axle sleeve 701 and " one " font support plate 702, the aperture of described first axle sleeve 701 is 8H7, described first axle sleeve 701 by nut lock on the cylinder outer wall of described shank 15, and between slider pin 16 and lower sleeve 19; The outer panel face of described " one " font support plate 702 and described shank 15 axis parallel, the interior plate face of described " one " font support plate 702 is fixedly connected with described first measuring seat 7, and described first acceleration transducer 5 is adsorbed on the outer panel face of described " one " font support plate 702.
Shown in Figure 4, the second measuring point selects the vertical direction at shank 15 axial line, and direction of measurement is perpendicular to shank 15 direction of motion.Shown in Fig. 7,8, described second measuring seat 10 is made up of the second axle sleeve 1001 and horizontal " T " font support plate 1002, the aperture of described second axle sleeve 1001 is 8H7, described second axle sleeve 1001 by nut lock on the cylinder outer wall of described shank 15, and between slider pin 16 and lower sleeve 19; The sensor installed surface of the left supported plate of described " T " font support plate 1002 and described shank 15 axis parallel, the right supported plate of described " T " font support plate 1002 is vertical with described shank 15 axial line; The left supported plate of described " T " font support plate 1002 is fixedly connected with described second measuring seat 10, and described second acceleration transducer 6 is adsorbed on the right supported plate of described " T " font support plate 1002.
Shank 15 is reciprocating, shown in Figure 4, shank motion does not limit the rotation of shank 15 in design, but reach in the to-and-fro movement of chute 20 rotation limiting shank 15 by slide block 21 through slider pin 16, cause chute 20 like this, exercise not harmony between slider pin 16 and shank 15, the bending and distortion of result production part; And sewing thread is through the pinprick of eedle, stitch tension action direction and shank direction of motion space intersection, the feature of therefore shank motion there is flexural deformation, torsional deformation, all there is vibration in direction of motion with perpendicular to direction of motion.
Shown in Figure 9, Fig. 9 represents shank bend sensor 1, the installation site of twist sensors 2 on shank 15, described bend sensor 1 pastes the side of the cylinder outer wall of described shank 15 Φ 8, described twist sensors 2 pastes the opposite side of the cylinder outer wall of described shank 15 Φ 8, and described bend sensor 1 and described twist sensors 2 are all between slider pin 16 and lower sleeve 19.
Shown in Figure 11, described bend sensor 1 is made up of the first copper sheet 101 of a slice 0.5 millimeters thick and four first foil gauges 102 be pasted onto on described first copper sheet 101, the stickup direction of described four first foil gauges 102 and described shank 15 axis parallel, measuring shank bending at centerline direction, is also the bending of direction of motion.
Shown in Figure 11, described twist sensors 2 is made up of the second copper sheet 201 of a slice 0.5 millimeters thick and four second foil gauges 202 be pasted onto on described second copper sheet 201, the stickup direction of described four second foil gauges 202 becomes 45o angle with described shank 15 axial line, measures the torsional deformation of shank direction of axis line.
Described first copper sheet 101 and described second copper sheet 201 very thin, can embowment, be pasted onto on the cylinder outer wall of shank 15.
Shown in Figure 12,13, Figure 12,13 represents the installation site of bending sensor 3 on chute 20, the sliding position of slide block 21 in chute 20 is between the holes in chute 20, and described bending sensor 3 is also pasted onto on the lateral wall between this holes of chute 20.
Shown in Figure 14, described bending sensor 3 is made up of the 3rd copper sheet 301 of a slice 0.5 millimeters thick and eight the 3rd foil gauges 302 be pasted onto on described 3rd copper sheet 301, wherein the stickup direction of four described 3rd foil gauges 302 is parallel with slide block 21 direction of motion, measure the flexural deformation on chute 20 centerline direction, also be the flexural deformation of direction of motion, the stickup direction of another four described 3rd foil gauges 302 becomes 45o angle with slide block 21 direction of motion, measures the torsional deformation of chute 20 side; Described 3rd copper sheet 301 is pasted onto 3.5mm thickness place in the middle part of chute 20 side.
Shown in Figure 15, electric bridge 401, transmitter 402, signal recognition device 403 and signal amplifier 404 is comprised in described Signal Collection and amplify device 4, described electric bridge 401 is respectively described bend sensor 1, described twist sensors 2 and described bending sensor 3 and powers, and described bend sensor 1, described twist sensors 2 are connected with described signal recognition device 403 through described transmitter 402 respectively with described bending sensor 3; Described scrambler 11 and described control panel 12 form clock signal control device, and described scrambler 11 is connected with described signal recognition device 403 through described control panel 12; Described signal recognition device 403 is connected with described signal analyzer 13 through described signal amplifier 404.
The signal of described first foil gauge 102, second foil gauge 202 and the 3rd foil gauge 302 enters described transmitter 402 respectively, and through signal recognition with after amplifying, signal exports from described Signal Collection and amplify device 404, enters described signal analyzer 13.
Described scrambler 11 and described control panel 12 form clock signal control device of the present invention, and described scrambler 11 can adopt the scrambler of resolution 1o or 2o, and described scrambler 11 produces the horizontal ordinate of sequential and experiment curv.
On sewing machine, axle 17 turns round, gear pair 18 is placed on rear side of headstock, upper axle 17 drives scrambler 11 to turn round by gear pair 18, the encoded device 11 in angle of revolution converts angle to, and coding angle enters control panel 12 and converts digital signal to, and control panel 12 angularly sends instruction, measurement sequential is provided, the record of command control signal, output signal entering signal collection amplifier 4 and the signal analyzer 13 respectively of control panel 12, controls record and the display timing generator of each signal.
Above-described embodiment, just in order to technical conceive of the present invention and feature are described, its objective is and is one of ordinary skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.The change of every equivalence done by the essence of content of the present invention or modification, all should be encompassed in protection scope of the present invention.
Claims (7)
1. shank on-line vibration and a flexural measurement device, is characterized in that: comprise bend sensor (1), twist sensors (2), bending sensor (3), Signal Collection and amplify device (4), the first acceleration transducer (5), the second acceleration transducer (6), the first load amplifier (8), the second load amplifier (9), scrambler (11), control panel (12) and signal analyzer (13); Described first acceleration transducer (5) and described second acceleration transducer (6) are separately positioned on the first measuring seat (7) on shank (15) and the second measuring seat (10), described bend sensor (1) and described twist sensors (2) are separately positioned on the cylinder outer wall of described shank (15), described bending sensor (3) is arranged on the lateral wall of chute (20), and described scrambler (11) is arranged on the gear pair (18) of axle on sewing machine (17);
Described bend sensor (1), described twist sensors (2) are all connected with described signal analyzer (13) by described Signal Collection and amplify device (4) with described bending sensor (3); Described first acceleration transducer (5), described second acceleration transducer (6) are connected with described signal analyzer (13) respectively by described first load amplifier (8), described second load amplifier (9); Described scrambler (11) connects described control panel (12), described control panel (12) tunnel is directly connected with described signal analyzer (13), another road is connected with described signal analyzer (13) through described Signal Collection and amplify device (4), and described signal analyzer (13) is connected with a display screen (19).
2. shank on-line vibration according to claim 1 and flexural measurement device, is characterized in that: described bend sensor (1) pastes the side of the cylinder outer wall of described shank (15), and is positioned between slider pin (16) and lower sleeve (19); Described bend sensor (1) is made up of a slice first copper sheet (101) and four first foil gauges (102) be pasted onto on described first copper sheet (101), the stickup direction of described four first foil gauges (102) and described shank (15) axis parallel.
3. shank on-line vibration according to claim 1 and flexural measurement device, is characterized in that: described twist sensors (2) pastes the opposite side of the cylinder outer wall of described shank (15), and is positioned between slider pin (16) and lower sleeve (19); Described twist sensors (2) is made up of a slice second copper sheet (201) and four second foil gauges (202) be pasted onto on described second copper sheet (201), and the stickup direction of described four second foil gauges (202) becomes 45o angle with described shank (15) axial line.
4. shank on-line vibration according to claim 1 and flexural measurement device, it is characterized in that: described bending sensor (3) is pasted onto on the lateral wall of chute (20), described bending sensor (3) is made up of a slice the 3rd copper sheet (301) and eight the 3rd foil gauges (302) be pasted onto on described 3rd copper sheet (301), wherein the stickup direction of four described 3rd foil gauges (302) is parallel with slide block (21) direction of motion, measure the flexural deformation of chute, the stickup direction of another four described 3rd foil gauges (302) becomes 45o angle with slide block (21) direction of motion, measure the torsional deformation of chute.
5. shank on-line vibration according to claim 1 and flexural measurement device, it is characterized in that: described first measuring seat (7) is made up of the first axle sleeve (701) and " one " font support plate (702), described first axle sleeve (701) is set on the cylinder outer wall of described shank (15), and is positioned between slider pin (16) and lower sleeve (19); The outer panel face of described " one " font support plate (702) and described shank (15) axis parallel, the interior plate face of described " one " font support plate (702) is fixedly connected with described first measuring seat (7), and described first acceleration transducer (5) is adsorbed on the outer panel face of described " one " font support plate (702).
6. shank on-line vibration according to claim 1 and flexural measurement device, it is characterized in that: described second measuring seat (10) is made up of the second axle sleeve (1001) and horizontal " T " font support plate (1002), described second axle sleeve (1001) is set on the cylinder outer wall of described shank (15), and is positioned between slider pin (16) and lower sleeve (19); The left supported plate sensor installed surface of described " T " font support plate (1002) and described shank (15) axis parallel, the right supported plate of described " T " font support plate (1002) is vertical with described shank (15) axial line; The left supported plate of described " T " font support plate (1002) is fixedly connected with described second measuring seat (10), and described second acceleration transducer (6) is adsorbed on the right supported plate of described " T " font support plate (1002).
7. shank on-line vibration according to claim 1 and flexural measurement device, it is characterized in that: in described Signal Collection and amplify device (4), comprise electric bridge (401), transmitter (402), signal recognition device (403) and signal amplifier (404), described electric bridge (401) is respectively described bend sensor (1), described twist sensors (2) and described bending sensor (3) power supply, described bend sensor (1), described twist sensors (2) is connected with described signal recognition device (403) through described transmitter (402) respectively with described bending sensor (3), described scrambler (11) and described control panel (12) composition clock signal control device, described scrambler (11) is connected with described signal recognition device (403) through described control panel (12), described signal recognition device (403) is connected with described signal analyzer (13) through described signal amplifier (404).
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| CN201510235845.3A CN105004366A (en) | 2015-05-11 | 2015-05-11 | Needle bar on-line vibration and bending measuring device |
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| CN201510235845.3A CN105004366A (en) | 2015-05-11 | 2015-05-11 | Needle bar on-line vibration and bending measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398336A (en) * | 2019-07-30 | 2019-11-01 | 燕山大学 | Sewing-machine foot high-frequency percussion fatigue tester |
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2015
- 2015-05-11 CN CN201510235845.3A patent/CN105004366A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 辉殿臣: "《服装机械原理》", 31 December 1990 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398336A (en) * | 2019-07-30 | 2019-11-01 | 燕山大学 | Sewing-machine foot high-frequency percussion fatigue tester |
| CN110398336B (en) * | 2019-07-30 | 2023-02-28 | 燕山大学 | Sewing machine presser foot high-frequency impact fatigue testing machine |
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