CN104613126B - A kind of liquid-gas type loom let-off mechanism buffer and application thereof - Google Patents
A kind of liquid-gas type loom let-off mechanism buffer and application thereof Download PDFInfo
- Publication number
- CN104613126B CN104613126B CN201510070485.6A CN201510070485A CN104613126B CN 104613126 B CN104613126 B CN 104613126B CN 201510070485 A CN201510070485 A CN 201510070485A CN 104613126 B CN104613126 B CN 104613126B
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- Prior art keywords
- buffer
- piston
- piston sheet
- chamber
- sheet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/04—Control of the tension in warp or cloth
- D03D49/06—Warp let-off mechanisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3228—Constructional features of connections between pistons and piston rods
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Actuator (AREA)
Abstract
The invention discloses a kind of liquid-gas type loom let-off mechanism buffer, including buffer housing and piston, buffer housing is divided into air chamber and grease chamber by a thin film, air chamber one end is extended with draw ring, piston is made up of piston rod and piston sheet, on piston rod, one end is fixedly connected with c-type buffer head, and piston sheet includes upper piston sheet and lower piston sheet；Buffer housing open at one end is provided with fairlead, and fairlead one end is arranged with clamping sleeve, and piston rod is additionally provided with buffer case lid；The present invention have also been devised the application of a kind of liquid-gas type loom let-off mechanism buffer, lubricating oil is injected in the grease chamber of buffer housing, and buffer is fixed on let-off mechanism by draw ring and c-type buffer head, by the revolution amount of buffer adaptation beam of a loom, making warp thread sendout change, present configuration is simple, can be according to different product by the situation that is interspersed of through hole on regulating piston sheet, reduce the response speed of buffer, it is ensured that the quality weaved cotton cloth and efficiency.
Description
Technical field
The present invention relates to a kind of buffer and application thereof, the liquid-gas type being specifically related on a kind of loom in let-off mechanism
Buffer and application thereof, belong to textile industry equipment technical field of improvement.
Background technology
Loom, also known as loom, is the machinery that the lines such as cotton, fiber crops, hair are combined into cloth with longitude and latitude structural arrangement.Loom
History had thousand of year, in thousand of years, loom has a great development, and especially after the industrial revolution, occurs in that
The various looms such as rapier loom, air-jet loom, water-jet loom, gripper shuttle loom, these maximizations, mechanization, intelligentized
Loom gradually instead of original manual loom, applies in the production of cloth, and let-off mechanism is in the operating of loom
In be particularly important.
The principle of loom let-off mechanism work at present is that beam of a loom overcomes braking moment to turn round under the effect of warp tension,
Allowing warp thread broadcast out from beam of a loom, complete warp let-off action, during the warp let-off, warp run-in is by special Adjustable Let off Motion
It is adjusted；How many warp run-ins of the adjustable type warp let-off is by warp tension Determines at that time, therefore Adjustable Let off Motion one
As using the back rest as tension force sensing part, by the revolution amount of buffer adaptation beam of a loom, make warp thread sendout change, buffering
The reaction action speed of device, response speed controllability, for the adjustability of different product, determine the effect of buffer, and
Impact on weave cotton cloth quality and effect.
The most existing buffer for textile industry uses oil system piston structure, imitates timely for reaching the beam of a loom warp let-off
Really, piston is bored oil guiding hole, make lower oil cavitie connect, accelerate the reaction action of buffer；But this buffer lacks adjustability,
Different cloth base product cannot be adapted to let-off mechanism response speed requirement；Simultaneously as the response speed of buffer is accelerated, knitting
During cloth, easily cause and on cloth, produce obvious gap, leverage the textile quality of cloth, cause the wave of raw material
Take and the increase of cost, research and develop a kind of buffer for weaving loom let-off mechanism that can overcome drawbacks described above and application becomes
The technical problem that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
The technical problem to be solved is, the shortcoming overcoming prior art, it is provided that a kind of liquid-gas type loom send
Through mechanism's buffer and application thereof, this buffer structure is simple, good looking appearance, and application is simple, by piston sheet UNICOM buffer
Housing, reduces the response speed of buffer, improves the controllability of buffer, can be according to different product by regulating upper and lower piston sheet
The situation that is interspersed of upper through hole, regulates buffer response speed, it is ensured that the quality weaved cotton cloth and efficiency, the air chamber energy simultaneously set up
Auxiliary piston rod back and forth movement, reduces energy consumption.
In order to solve above technical problem, the present invention provides a kind of liquid-gas type loom let-off mechanism buffer, including delaying
Rushing device housing and piston, piston horizontally extends in buffer case body, and piston can move horizontally in buffer case body, buffer
Housing is to be divided into air chamber and grease chamber by a thin film in hollow structure and its one end seal other end opening, buffer, air chamber away from
One end of grease chamber is extended with draw ring, and air chamber is semicircular structure and air chamber is provided with at air inlet, and grease chamber is tubular structure, and grease chamber
One end open away from air chamber；
Piston is by piston rod and is arranged at the piston sheet of piston rod one end and forms, and on piston rod, the one end away from piston sheet is solid
Determining connection and have c-type buffer head, piston sheet includes upper piston sheet and lower piston sheet, and is equipped with logical on upper piston sheet and lower piston sheet
Hole, grease chamber is divided into upper chamber and lower oil chamber by piston sheet；
Prolong its circumferencial direction inside buffer housing open at one end and be provided with fairlead, and one end projection buffer of fairlead
Housing, one end of fairlead projection buffer housing is arranged with clamping sleeve, is provided with between piston rod lower piston sheet and c-type buffer head
Buffer case lid, buffer case lid is suitable with clamping sleeve and is set on clamping sleeve.
The technical scheme that the present invention limits further is:
In aforementioned liquid-gas type loom let-off mechanism buffer, upper piston sheet and lower piston sheet are bolted to connection
On piston rod, the identical manhole that is of clear size of opening on upper piston sheet and lower piston sheet, and the center of circle of through hole is all same
On circumference.
In aforementioned liquid-gas type loom let-off mechanism buffer, when upper piston sheet and lower piston sheet are fixed, through hole interlocks
Distribution, the through hole on upper and lower piston sheet can be adjusted according to the needs of real work, lower oil chamber in UNICOM, upper and lower piston sheet
The most buffer speeds of part of upper through hole overlap are the fastest, and the fewest buffer speed of part of upper and lower piston sheet through hole overlap is the slowest.
In aforementioned liquid-gas type loom let-off mechanism buffer, between fairlead and described buffer housing, it is additionally provided with one layer
Sealing ring, it is ensured that be connected more firm, simultaneously between fairlead with buffer housing, it is ensured that when running, in buffer case body
Fluid will not overflow, and more, buffering effect is more preferable for shock-absorbing capacity.
In aforementioned liquid-gas type loom let-off mechanism buffer, fairlead and described piston rod interference fit, it is ensured that live
Sealing between stopper rod and fairlead, improves the performance of buffering.
The present invention have also been devised the application of above-mentioned liquid-gas type loom let-off mechanism buffer, particularly as follows:
First buffer housing and piston are separated, at the air inlet of air chamber, in air chamber, fill air, then will buffering
Lubricating oil upward, is injected in the grease chamber of buffer housing in device shell nozzle one end；
2. the upper piston sheet on piston sheet and lower piston sheet are rotated so that leading on upper piston sheet and lower piston sheet
Hole is in staggered distribution；
3. being filled in by piston sheet in buffer housing, buffer housing sealed end down and is fixed on warp let-off machine by draw ring
On the fixing post of structure side, the c-type buffer head on piston rod is fixed on the horizontal suspending weight arm of let-off mechanism side；
The horizontal suspending weight arm of let-off mechanism by c-type buffer head promote piston rod to the direction of air chamber move, air chamber with
Thin film between grease chamber offsets to the direction of air chamber, and the lubricating oil in upper chamber hinders piston rod movement to buffer it, and
Lubricating oil in upper chamber flows in lower oil chamber by the through hole on piston sheet, and the horizontal suspending weight arm of let-off mechanism pulls piston rod
Running to the direction away from air chamber, the pressure in air chamber also assists propelling movement piston rod to run to the direction away from air chamber, follows with this
Ring is reciprocal.
The technical scheme that the present invention limits further is:
The application of aforementioned liquid-gas type loom let-off mechanism buffer, the step 1. middle lubricants capacity that injects is grease chamber's volume
1/3rd.
The application of aforementioned liquid-gas type loom let-off mechanism buffer, step 2. according to loom let-off mechanism send through
The position size that on the thickness regulating piston sheet of yarn, through hole staggers, warp thread is the thinnest, then the through hole on upper piston sheet and lower piston sheet
The position staggered is the biggest；Warp thread is the thickest, then the position that the through hole on upper piston sheet and lower piston sheet staggers is the least.
The invention has the beneficial effects as follows:
Sealing one end of buffer cylinder body in the present invention and piston rod one end are respectively equipped with draw ring and c-type buffer head, energy
Buffer is well fixed, and is easily installed on miscellaneous equipment, as being fixed on let-off mechanism.
Piston sheet in the present invention uses the through hole on biplate composition, and upper and lower piston sheet to be in staggered distribution, and has connected buffering
The upper chamber of device housing and lower oil chamber, and the position that through hole staggers can be regulated, well control the reaction speed of tension force and buffer
Degree.
Piston sheet in the present invention is assembled by bolt-connection convenient dismounting on the piston rod and cleans, meanwhile, at buffer
The open at one end of housing is provided with the sealing member being made up of fairlead and clamping sleeve, then is reinforced by buffer case lid, really
Protect the sealing being in operation, it is ensured that fluid does not spills over, it is ensured that buffering effect.
Owing to tension force is the biggest, response speed affects the quality weaved cotton cloth the soonest, the let-off mechanism buffer structure in the present invention
Simply, the through hole in the design of the biplate having through hole, and upper and lower piston sheet is used to be in staggered distribution, it is possible to according to upper and lower piston sheet
The size of the position control tension force that upper through hole staggers, and then control response speed so that buffer response speed controllability is strengthened,
Be conducive to the stable operation of buffer, reach guarantee and weave cotton cloth quality and efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention；
Fig. 2 is the structure for amplifying schematic diagram of part A in Fig. 1；
In figure: 1-buffer housing, 2-piston, 21-piston rod, 22-piston sheet, 221-upper piston sheet, 222-lower piston
Sheet, 3-thin film, 4-air chamber, 5-upper chamber, 6-lower oil chamber, 7-draw ring, 8-c-type buffer head, 9-fairlead, 10-clamping sleeve, 11-
Buffer case lid.
Detailed description of the invention
Embodiment 1
A kind of liquid-gas type loom let-off mechanism buffer that the present embodiment provides, structure is as it is shown in figure 1, include buffer
Housing 1 and piston 2, piston 2 horizontally extends in buffer housing 1, and piston 2 can move horizontally in buffer housing 1, buffering
Device housing 1 is in hollow structure and its one end seals other end opening, is divided into air chamber 4 and oil by a thin film 3 in buffer housing 1
Room, air chamber 4 is extended with draw ring 7 away from one end of grease chamber, and air chamber 4 is provided with at air inlet for semicircular structure air chamber 4, and grease chamber is
Tubular structure, and grease chamber is away from the one end open of air chamber 4；
Piston 2 is by piston rod 21 and is arranged at the piston sheet 22 of piston rod 21 one end and forms, away from piston on piston rod 21
One end of sheet 22 is fixedly connected with c-type buffer head 8, and piston sheet 22 includes upper piston sheet 221 and lower piston sheet 222, upper piston sheet
221 and lower piston sheet 222 be bolted to connection on piston rod 21, and be all provided with on upper piston sheet 221 and lower piston sheet 222
Having through hole, and the identical manhole that is of clear size of opening, the center of circle of through hole is all on same circumference, and grease chamber is divided into by piston sheet 22
Upper chamber 5 and lower oil chamber 6；
Prolong its circumferencial direction inside buffer housing 1 open at one end and be provided with fairlead 9, and one end of fairlead 9 is stretched out slow
Rushing device housing 1, one end of fairlead 9 projection buffer housing 1 is arranged with clamping sleeve 10, between fairlead 9 and buffer housing 1
Be additionally provided with one layer of sealing ring, fairlead 9 and piston rod 21 interference fit, piston rod 21 upper piston sheet 221 and c-type buffer head 8 it
Between be provided with buffer case lid 11, buffer case lid 11 is suitable with clamping sleeve 10 and is set on clamping sleeve 10.
Embodiment 2
The present embodiment provides the application of liquid-gas type loom let-off mechanism buffer in embodiment 1, particularly as follows:
First buffer housing 1 and piston 2 are separated, at the air inlet of air chamber 4, in air chamber 4, fill air, then will
Buffer housing 1 open at one end upward, injects lubricating oil in the grease chamber of buffer housing 1, and injecting lubricants capacity is that grease chamber holds
Long-pending 1/3rd；
2. the upper piston sheet 221 on piston sheet 22 and lower piston sheet 222 are rotated so that upper piston sheet 221 and under
Through hole on piston sheet 222 is in staggered distribution, and sends through hole on the thickness regulating piston sheet 22 of warp thread according to loom let-off mechanism
The position size staggered, warp thread is the thinnest, then the position that the through hole on upper piston sheet 221 and lower piston sheet 222 staggers is the biggest；Warp thread
The thickest, then the position that the through hole on upper piston sheet 221 and lower piston sheet 222 staggers is the least；
3. filling in buffer housing 1 by piston sheet 22, buffer housing 1 sealed end down and is fixed on by draw ring 7
On the fixing post of let-off mechanism side, the c-type buffer head 8 on piston rod 21 is fixed on the horizontal suspending weight arm of let-off mechanism side
On；
The horizontal suspending weight arm of let-off mechanism promotes piston rod 21 to move to the direction of air chamber 4 by c-type buffer head 8, gas
Thin film 3 between room 4 and grease chamber offsets to the direction of air chamber 4, and the lubricating oil in upper chamber 5 hinders piston rod 21 to move to enter it
Lubricating oil in row buffering, and upper chamber 5 flows in lower oil chamber 6 by the through hole on piston sheet 22, and the level of let-off mechanism is hanged
Weighing arm pulls piston rod 21 to run to the direction away from air chamber 4, and the pressure in air chamber 4 also assists propelling movement piston rod 21 to away from gas
The direction of room 4 is run, and moves in circles with this.
In addition to the implementation, the present invention can also have other embodiments.All employing equivalents or equivalent transformation shape
The technical scheme become, all falls within the protection domain of application claims.
Claims (7)
1. an application for liquid-gas type loom let-off mechanism buffer, including buffer housing (1) and piston (2), described
Piston (2) horizontally extends in described buffer housing (1), and described piston (2) can level move in buffer housing (1)
Dynamic, described buffer housing (1) in hollow structure and its one end seal in other end opening, described buffer housing (1) by
One thin film (3) is divided into air chamber (4) and grease chamber, and described air chamber (4) is extended with draw ring (7), described air chamber (4) away from one end of grease chamber
Being provided with at air inlet for semicircular structure air chamber (4), described grease chamber is tubular structure, and grease chamber is away from the one of air chamber (4)
End opening；
Described piston (2) is by piston rod (21) and is arranged at the piston sheet (22) of piston rod (21) one end and forms, described piston rod
(21) on, the one end away from piston sheet (22) is fixedly connected with c-type buffer head (8), and described piston sheet (22) includes upper piston sheet
(221) and lower piston sheet (222), and it is equipped with through hole, described work on described upper piston sheet (221) and lower piston sheet (222)
Grease chamber is divided into upper chamber (5) and lower oil chamber (6) by patch (22)；
It is provided with fairlead (9) along its circumferencial direction inside described buffer housing (1) open at one end, and described fairlead (9)
Described buffer housing (1) is stretched out in one end, and one end of described fairlead (9) projection buffer housing (1) is arranged with clamping sleeve
(10), buffer case lid (11), institute it are provided with between described piston rod (21) lower piston sheet (222) and described c-type buffer head (8)
The buffer case lid (11) stated is suitable with described clamping sleeve (10) and is set on described clamping sleeve (10), its feature
It is: the application of this liquid-gas type loom let-off mechanism buffer is as follows:
First buffer housing (1) and piston (2) are separated, at the air inlet of air chamber (4), in air chamber (4), fill air,
Again by buffer housing (1) open at one end upward, in the grease chamber of buffer housing (1), lubricating oil is injected；
2. the upper piston sheet (221) on piston sheet (22) and lower piston sheet (222) are rotated so that upper piston sheet (221)
It is in staggered distribution with the through hole on lower piston sheet (222)；
3. filling in buffer housing (1) by piston sheet (22), buffer housing (1) sealed end down and passes through draw ring (7) admittedly
Being scheduled on the fixing post of let-off mechanism side, the c-type buffer head (8) on piston rod (21) is fixed on the level of let-off mechanism side
On suspending weight arm；
4. the horizontal suspending weight arm of let-off mechanism promotes piston rod (21) to move to the direction of air chamber (4) by c-type buffer head (8),
Thin film (3) between air chamber (4) and grease chamber offsets to the direction of air chamber (4), and the lubricating oil in upper chamber (5) hinders piston rod
(21) it is buffered by motion, and the lubricating oil in upper chamber (5) flows to lower oil chamber (6) by the through hole on piston sheet (22)
In, the horizontal suspending weight arm of let-off mechanism pulls piston rod (21) to run to the direction away from air chamber (4), the pressure in air chamber (4)
Also auxiliary propelling movement piston rod (21) is run to the direction away from air chamber (4), moves in circles with this.
The application of liquid-gas type loom let-off mechanism buffer the most according to claim 1, it is characterised in that: described upper work
Patch (221) and lower piston sheet (222) are bolted to connection on described piston rod (21), described upper piston sheet
(221) the identical manhole that is of clear size of opening and on lower piston sheet (222), and the center of circle of through hole is all on same circumference.
The application of liquid-gas type loom let-off mechanism buffer the most according to claim 2, it is characterised in that: described upper work
When patch (221) and lower piston sheet (222) are fixing, described through hole is interspersed.
The application of liquid-gas type loom let-off mechanism buffer the most according to claim 1, it is characterised in that: described guiding
It is additionally provided with one layer of sealing ring between set (9) and described buffer housing (1).
The application of liquid-gas type loom let-off mechanism buffer the most according to claim 1, it is characterised in that: described guiding
Set (9) and described piston rod (21) interference fit.
The application of liquid-gas type loom let-off mechanism buffer the most according to claim 1, it is characterised in that: step 1. in
Injecting lubricants capacity is 1/3rd of grease chamber's volume.
The application of liquid-gas type loom let-off mechanism buffer the most according to claim 1, it is characterised in that: step 2. in
Sending, according to loom let-off mechanism, the position size that the upper through hole of thickness regulating piston sheet (22) of warp thread staggers, warp thread is the thinnest,
The position that then through hole on upper piston sheet (221) and lower piston sheet (222) staggers is the biggest；Warp thread is the thickest, then upper piston sheet (221)
The least with the position that the through hole on lower piston sheet (222) staggers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510070485.6A CN104613126B (en) | 2015-02-10 | 2015-02-10 | A kind of liquid-gas type loom let-off mechanism buffer and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510070485.6A CN104613126B (en) | 2015-02-10 | 2015-02-10 | A kind of liquid-gas type loom let-off mechanism buffer and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104613126A CN104613126A (en) | 2015-05-13 |
| CN104613126B true CN104613126B (en) | 2017-01-04 |
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|---|---|---|---|
| CN201510070485.6A Expired - Fee Related CN104613126B (en) | 2015-02-10 | 2015-02-10 | A kind of liquid-gas type loom let-off mechanism buffer and application thereof |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3215614A1 (en) * | 1982-04-27 | 1983-02-03 | Anna Dorothea 8000 München Sapunarow-Ryffel | Hydraulic single-tube shock absorber with damping control |
| JP3233380B2 (en) * | 1994-02-28 | 2001-11-26 | 株式会社ショーワ | Hydraulic shock absorber |
| US6978872B2 (en) * | 2002-05-29 | 2005-12-27 | Progressive Suspension Inc. | Hydraulic dampers with pressure regulated control valve |
| CN203297456U (en) * | 2013-05-23 | 2013-11-20 | 宁波南方减震器制造有限公司 | Air and oil pressure damper |
| CN203585188U (en) * | 2013-10-30 | 2014-05-07 | 武汉天捷重型装备股份有限公司 | Hydro-pneumatic spring suspension oil cylinder |
| CN104179872A (en) * | 2014-07-24 | 2014-12-03 | 三一矿机有限公司 | Variable damping oil-gas suspension cylinder and mining dump truck thereof |
| CN204477157U (en) * | 2015-02-10 | 2015-07-15 | 苏州陈恒织造有限公司 | A kind of liquid-gas type weaving machine let-off mechanism buffer |
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