CA1311664C - Dobby mechanism - Google Patents
Dobby mechanismInfo
- Publication number
- CA1311664C CA1311664C CA000550411A CA550411A CA1311664C CA 1311664 C CA1311664 C CA 1311664C CA 000550411 A CA000550411 A CA 000550411A CA 550411 A CA550411 A CA 550411A CA 1311664 C CA1311664 C CA 1311664C
- Authority
- CA
- Canada
- Prior art keywords
- knives
- loom
- dobby
- swing
- hook
- Prior art date
- 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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- Looms (AREA)
Abstract
ABSTRACT
A dobby mechanism for looms has frame means for supporting first and second knives that reciprocate radially out of phase at the loom frequency. A plurality of swing levers are adapted to be coupled to and to operate a loom har-ness to effect shedding of the warp. Hooks are pivoted to each swing lever for engagement with one or the other of the knives. The hooks are actuated to engage a selected one of the knives. The hooks are controlled by pattern control means, whereby selected levers may be operated as determined by the pattern control means.
A dobby mechanism for looms has frame means for supporting first and second knives that reciprocate radially out of phase at the loom frequency. A plurality of swing levers are adapted to be coupled to and to operate a loom har-ness to effect shedding of the warp. Hooks are pivoted to each swing lever for engagement with one or the other of the knives. The hooks are actuated to engage a selected one of the knives. The hooks are controlled by pattern control means, whereby selected levers may be operated as determined by the pattern control means.
Description
OPENSHED DWELL TYPE DOBBY
The invention relates to openshed dwell type dobbies for weaving looms, and more particularly to dobbies having their drive mechanism operated at the loom frequency. The object of the inven-tion is to provide such dobbies with a reciprocating drive which gets its motion delivered selectively and in full to the swing levers that shed the loom harnesses.
In the design weaving process, openshed dwell type dobbies offer the most desirable mode of shedding performance.
Openshed permits the warp threads to be selectively shed from two base positions, and dwell allows the shed to remain narrow and stationary during the weft insertion. Openshed thus eliminates the wasted thread motion that was once needed when the selection was made from a single base, and dwell avoids the extra warp tension and breakage that occurs if the shed opening is large and non-stationary. Dobbies which operate at the loom frequency usually depend on a gear system of drive, and are represented by the well-known Leeming and Knowles dobbies. Essentially they include a drive gear which is operated uninterruptedly at the loom frequency, and a crank gear which is driven selectively, a half turn at a time. Each half turn of the crank is then transmitted to the swing lever through a crank rod, while the two end posi-tions of the crank define the two base positions of the openshed.
In;the L~eeming dobby, it is the drive gear which is operated to achieve the selectlon, and in the Knowles dobby it is the driven gear which is operated for this purpose. The drive gear, in each :
:: :
, : . :
6 6 D.
case, carries teeth only on a half of the circumference, so that the blank half represents an idle motion and yields the dwell.
Gear system dobbies are highly suitable for positive shedding, but cannot cope with high loom speeds. ~his speed limitation is due to the following known factors: Resistance of the gear components to quick selection, inertia of the crank mechanism to motion transmission, infinite acceleration of the driven gear at the start of each motion, and the non-adjustable nature of the dwell.
Nevertheless, the gear system dobbies offer the inherent advantage 10 of shed stability, due to the fact that the drive and the driven components remain disconnected with each other during the openshed and dwell operations.
Reciprocating drives are very common in dobbies which operate at half the loom frequency, e.g. the well known Keighley ?
dobby and its derivatives. However, it is not common to use a reciprocating drive in dobbies which operate at the full loom frequency. One exception is the present inventor's early work (Swiss Pat. No. 370,025 and U.K. Pat. No. 988,690), which was like a Leeming dobby in that the selection process was applied on the 20 drive mechanism. The present invention is more like a Knowles dobby in that the selection process is applied on the dri~en mechanism. Moreover, in conformity with the standard technology of dobby looms, the present invention makes use of swing levers for shedding the loom harnesses. It will be noted that the main advantages of the present invention are That it links the full motion of the drive with the swing levers, that it achieves the selection through hooks that are easy to operate and select, that ,,,, : . .
.~
:.
1 3 1 1 666~36l-65 it ensures a perEect shed stability by keeping the driven components disconnected from the drive during the openshed and dwell, that it allows each driven motion to commence with a mild acceleration, that it has the provision ror a variable dwell, and that i-t economises the size of the dobby mechanism.
Essentially, the present invention, an openshed dwell type dobby comprises a drive mechanism having two drive knives which reciprocate radially out of phase at the loom frequency;
means of selection which operate on each loom cycle; and a plurality of swing levers which carry each a hook and are shed from two separate base positions by linking the hooks selectively with the drive. It will be seen that a simple combination of these dobby components can very logically provide the above noted important advantages.
Therefore this invention seeks to provide an openshed dwell type dobby for shedding warp harnesses of a weaving loom, comprising: i) a pair of drive knives which reciprocate out of phase at a full frequency of a related loom between two fixed base positions; ii) a plurality of swing levers which are rested at said two base positions and are selectively shed from each different of these positions to the other simultaneously by a particular knife of the said pair such that both knives, on completing respective shedding strokes, return concurrently through idle strokes to respective original positions; iii) swing ~levers (ii) connected individually to harnesses of said related ;loom and deliver,~on said shedding strokes, the full motion of each knife to the harnesses be;ng shed; iv) hook means pivoted .
.
-1 ~ I 1 6 6 4 67361-65 directly onto each of said swing levers to engage said swing levers with said particular knives from said different positions;
v) means of selection for selectively actuating said hook means from said two base positions according to a given pattern.
The invention is now described with the help oE a concrete example given in the following drawings, in which:
Fig. 1 is a front view in section and shows the swing lever at the upper base position mechanism Eor the operation of the knives is omitted Eor the sake of clarity.
Fig. 2 corresponds to Fig. 1, but shows the swing lever at the lower base position and includes the mechanism omitted in Fig. 1.
Fig. 3 shows one possible arrangement mounting the dobby on a loom.
Referring to Fig. 1 of the drawings, drlve knives 1 and 2 reciprocate at the loom frequency radially out of phase and, as shown by full arrows, each knife commences its shedding stroke from 3a ~""~a . ` ,: : . : ' ' ' . ` ' ' ' ~ ' , . i ~ - . .. . .
--```` 131 1664 a different base or position. After the shedding stroke, the knives return to their original positions, but these return strokes are idle, occur concurrently, and yield the dwell. A
number of swing levers 3, each carrying a ~ixed notch 4 and a two-way hook 5 pivoted at 25 to lever 3, are placed in such a manner that the hooks are disposed in between the two knives and can be selectively linked with either knife from its particular base. Swing levers 3 are pivoted on fixed shaft 12. Fig. 1 shows a representative swing lever resting in the upper base position, which corresponds to the base of knife 2. In this position, the notch 4 is engaged by an elevator 6, held on a fixed pivot in the cross bar 7. The means of selection consists of a series of composite levers 24, one for each swing lever and composed of a rigid portion 8 and a spring portion 9, and a pattern cylinder 10, which is rotated intermittently, one step on each return stroke of the knives. The mechanism for intermittent motion is not shown, since such mechanisms are very common. In each step, the cylinder 10 presents a fresh stud or blank 10' to each composite lever 24, a stud 10' being presented i~ the swing lever 3 is required to occupy the upper position. This upper position, and also the corresponding positions of the related hook 5 and elevator 6, is shown in Fig. 1. It can be seen that the swing lever 3 and its hook will remain completely disconnected from the knives in this partlcular position, as long as a stud 10' is followed by a stud on the pattern cylinder 10.
~ When the swing lever 3 is required to shed from the .
upper position, thé composite lever 24 is made to drop and rest on .
- .
131 16~4 a common rod 19, by presenting a blank on cylinder 10. This makes the hook 5 drop to a position in which it is engageable by knife 2 and, simultaneously, the spring 9 is withdrawn from the elevator 6. As the knife 2 now approaches the end of its idle stroke, it engages the hook 5, releases the elevator 6 and sheds the swing lever 3, in that order~ The lower base position is reached when the swing lever comes to rest against a fixed cross bar 17 and, in that position, the hook 5 again occupies a neutral position between drive knives 1, 2, as shown in Fig. 2. It will be seen later that the swing lever 3 is biased downwards by string 21, which bias allows the lower base position of Fig. 2 to be defined by the cross bar 17, on which all the swing levers rest when selected by blanks.
Fig. 2 shows the drive arrangement for knives 1, 2, and the swing lever 3 resting in the lower base position. The drive knives 1, 2 are mounted respectively on shafts 11 and 12, through gears 13, 14 and side arms 15, 16. Gear 13 and arm 15 operate integrally and are fixed on shaft 11; gear 14 and arm 16 also operate integrally, but are free on shaft 12. Gear 13 and 14 are mutually coupled. However, shaft 11 is free in the dobby frame, but shaft 12 is fixed, and thus the drive knives 1, 2 can both be made to reciprocate in opposite directions by oscillating the shat 11. Figs. 1 and 2 both represent the same inner side of the dobby frame 20. The opposite side of the frame (not shown) supports the other ends of shafts 11, 12, on which are mounted the counterparts of gears 13, 1~ and side arms 15, 16. Thus the knives 1 and 2 are actually operated by respective arm pairs 15 .
- -:
..' :
': ` ' `
, ~ . . . .
1~1 166~
and 16, located one inside the other. The two sides of the dobby frame 20 are held together by cross bars 17, 18. Only one repres-entative swing lever 3, with its related elevator 6 and composite lever 24, is shown in the drawings; but usually their number varies from 12 to 24, and all are placed on the same centre to operate selectively in the same manner.
The shedding of the swing lever 3 by knife 1, from the base position in Fig. 2, is done by presenting a stud 10' on the pattern cylinder 10. The stud raises the composite lever 24, and hence the related elevator 6 and hook. The hook is thus engaged by knife 1 on the start of its shedding stroke, and the full motion of the knife is subsequently communicated to the swing lever. When the upper position of the swing lever 3 is reached and knife 1 has just reversed its motion, elevator 6 engages the notch 4, the hook 5 drops on the composite lever 8, and the cycle is repeated from the position of Fig. 1. A close study will reveal that the elevator 6 needs resilient pressure to disengage the hook 5 from knife 2 and also to engage the hook 5 with knife 1. This pressure is supplied by the spring portion 9 of the composite lever.
Fig. 3 shows diagrammatically a ront view of a loom equipped with the present dobby. A string 21 connects each swing lever 3 with a loom harness 22 of loom 23. The mounting arrange-ment lS according to the conventional practice used in negative dobby shedding. The loom harness 22 is biased downwards by spring action, supplied by a bottom motion, and the bias is carried to the swing lever 3 through string 21. The shaft 11 is oscillated 131 166~
at the loom frequency by coupling it with the crank shaEt of the loom through a crank mechanism, (not shown). The crank arm of shaft 11 is shown in dotted lines as it is hidden from the view.
When the shaft 11 is thus oscillated by a simple crank, the two strokes of the drive are equal and the dwell equals a half of the loom cycle. However, if a shorter dwell is required, say for small width looms, the shaft 11 can be made to oscillate by a quick return motion. Such motions are well known and not shown in the present drawings. It is important to note that the drive knives 1 and 2 must operate at different swing angles to deliver the same motion to the swing lever 3. This provision is made while designing the gear ratio between the gears 13 and 14.
It will be noted that the hooks introduced for the selective transmission of motion are comparatively lighter in weight and easier to select than the corresponding components used in dobbies which operate at the loom frequency. Moreover, each motion of the drive commences with a zero acceleration, and the driven components follow the same motion. Another point to note is that the swing levers receive not only the full motion of the drive, bat also oscillate in a wide angle of swing. This is rendered possible by allowing the swing levers and the drive knives to be operated on axes which are either identical or close to each other. In consequence, swing levers of very small length can be used to transmit the full motion required for the shedding purpose, and this same economy is reflected in the rest of the dobby mechanism.
, ~
:
The invention relates to openshed dwell type dobbies for weaving looms, and more particularly to dobbies having their drive mechanism operated at the loom frequency. The object of the inven-tion is to provide such dobbies with a reciprocating drive which gets its motion delivered selectively and in full to the swing levers that shed the loom harnesses.
In the design weaving process, openshed dwell type dobbies offer the most desirable mode of shedding performance.
Openshed permits the warp threads to be selectively shed from two base positions, and dwell allows the shed to remain narrow and stationary during the weft insertion. Openshed thus eliminates the wasted thread motion that was once needed when the selection was made from a single base, and dwell avoids the extra warp tension and breakage that occurs if the shed opening is large and non-stationary. Dobbies which operate at the loom frequency usually depend on a gear system of drive, and are represented by the well-known Leeming and Knowles dobbies. Essentially they include a drive gear which is operated uninterruptedly at the loom frequency, and a crank gear which is driven selectively, a half turn at a time. Each half turn of the crank is then transmitted to the swing lever through a crank rod, while the two end posi-tions of the crank define the two base positions of the openshed.
In;the L~eeming dobby, it is the drive gear which is operated to achieve the selectlon, and in the Knowles dobby it is the driven gear which is operated for this purpose. The drive gear, in each :
:: :
, : . :
6 6 D.
case, carries teeth only on a half of the circumference, so that the blank half represents an idle motion and yields the dwell.
Gear system dobbies are highly suitable for positive shedding, but cannot cope with high loom speeds. ~his speed limitation is due to the following known factors: Resistance of the gear components to quick selection, inertia of the crank mechanism to motion transmission, infinite acceleration of the driven gear at the start of each motion, and the non-adjustable nature of the dwell.
Nevertheless, the gear system dobbies offer the inherent advantage 10 of shed stability, due to the fact that the drive and the driven components remain disconnected with each other during the openshed and dwell operations.
Reciprocating drives are very common in dobbies which operate at half the loom frequency, e.g. the well known Keighley ?
dobby and its derivatives. However, it is not common to use a reciprocating drive in dobbies which operate at the full loom frequency. One exception is the present inventor's early work (Swiss Pat. No. 370,025 and U.K. Pat. No. 988,690), which was like a Leeming dobby in that the selection process was applied on the 20 drive mechanism. The present invention is more like a Knowles dobby in that the selection process is applied on the dri~en mechanism. Moreover, in conformity with the standard technology of dobby looms, the present invention makes use of swing levers for shedding the loom harnesses. It will be noted that the main advantages of the present invention are That it links the full motion of the drive with the swing levers, that it achieves the selection through hooks that are easy to operate and select, that ,,,, : . .
.~
:.
1 3 1 1 666~36l-65 it ensures a perEect shed stability by keeping the driven components disconnected from the drive during the openshed and dwell, that it allows each driven motion to commence with a mild acceleration, that it has the provision ror a variable dwell, and that i-t economises the size of the dobby mechanism.
Essentially, the present invention, an openshed dwell type dobby comprises a drive mechanism having two drive knives which reciprocate radially out of phase at the loom frequency;
means of selection which operate on each loom cycle; and a plurality of swing levers which carry each a hook and are shed from two separate base positions by linking the hooks selectively with the drive. It will be seen that a simple combination of these dobby components can very logically provide the above noted important advantages.
Therefore this invention seeks to provide an openshed dwell type dobby for shedding warp harnesses of a weaving loom, comprising: i) a pair of drive knives which reciprocate out of phase at a full frequency of a related loom between two fixed base positions; ii) a plurality of swing levers which are rested at said two base positions and are selectively shed from each different of these positions to the other simultaneously by a particular knife of the said pair such that both knives, on completing respective shedding strokes, return concurrently through idle strokes to respective original positions; iii) swing ~levers (ii) connected individually to harnesses of said related ;loom and deliver,~on said shedding strokes, the full motion of each knife to the harnesses be;ng shed; iv) hook means pivoted .
.
-1 ~ I 1 6 6 4 67361-65 directly onto each of said swing levers to engage said swing levers with said particular knives from said different positions;
v) means of selection for selectively actuating said hook means from said two base positions according to a given pattern.
The invention is now described with the help oE a concrete example given in the following drawings, in which:
Fig. 1 is a front view in section and shows the swing lever at the upper base position mechanism Eor the operation of the knives is omitted Eor the sake of clarity.
Fig. 2 corresponds to Fig. 1, but shows the swing lever at the lower base position and includes the mechanism omitted in Fig. 1.
Fig. 3 shows one possible arrangement mounting the dobby on a loom.
Referring to Fig. 1 of the drawings, drlve knives 1 and 2 reciprocate at the loom frequency radially out of phase and, as shown by full arrows, each knife commences its shedding stroke from 3a ~""~a . ` ,: : . : ' ' ' . ` ' ' ' ~ ' , . i ~ - . .. . .
--```` 131 1664 a different base or position. After the shedding stroke, the knives return to their original positions, but these return strokes are idle, occur concurrently, and yield the dwell. A
number of swing levers 3, each carrying a ~ixed notch 4 and a two-way hook 5 pivoted at 25 to lever 3, are placed in such a manner that the hooks are disposed in between the two knives and can be selectively linked with either knife from its particular base. Swing levers 3 are pivoted on fixed shaft 12. Fig. 1 shows a representative swing lever resting in the upper base position, which corresponds to the base of knife 2. In this position, the notch 4 is engaged by an elevator 6, held on a fixed pivot in the cross bar 7. The means of selection consists of a series of composite levers 24, one for each swing lever and composed of a rigid portion 8 and a spring portion 9, and a pattern cylinder 10, which is rotated intermittently, one step on each return stroke of the knives. The mechanism for intermittent motion is not shown, since such mechanisms are very common. In each step, the cylinder 10 presents a fresh stud or blank 10' to each composite lever 24, a stud 10' being presented i~ the swing lever 3 is required to occupy the upper position. This upper position, and also the corresponding positions of the related hook 5 and elevator 6, is shown in Fig. 1. It can be seen that the swing lever 3 and its hook will remain completely disconnected from the knives in this partlcular position, as long as a stud 10' is followed by a stud on the pattern cylinder 10.
~ When the swing lever 3 is required to shed from the .
upper position, thé composite lever 24 is made to drop and rest on .
- .
131 16~4 a common rod 19, by presenting a blank on cylinder 10. This makes the hook 5 drop to a position in which it is engageable by knife 2 and, simultaneously, the spring 9 is withdrawn from the elevator 6. As the knife 2 now approaches the end of its idle stroke, it engages the hook 5, releases the elevator 6 and sheds the swing lever 3, in that order~ The lower base position is reached when the swing lever comes to rest against a fixed cross bar 17 and, in that position, the hook 5 again occupies a neutral position between drive knives 1, 2, as shown in Fig. 2. It will be seen later that the swing lever 3 is biased downwards by string 21, which bias allows the lower base position of Fig. 2 to be defined by the cross bar 17, on which all the swing levers rest when selected by blanks.
Fig. 2 shows the drive arrangement for knives 1, 2, and the swing lever 3 resting in the lower base position. The drive knives 1, 2 are mounted respectively on shafts 11 and 12, through gears 13, 14 and side arms 15, 16. Gear 13 and arm 15 operate integrally and are fixed on shaft 11; gear 14 and arm 16 also operate integrally, but are free on shaft 12. Gear 13 and 14 are mutually coupled. However, shaft 11 is free in the dobby frame, but shaft 12 is fixed, and thus the drive knives 1, 2 can both be made to reciprocate in opposite directions by oscillating the shat 11. Figs. 1 and 2 both represent the same inner side of the dobby frame 20. The opposite side of the frame (not shown) supports the other ends of shafts 11, 12, on which are mounted the counterparts of gears 13, 1~ and side arms 15, 16. Thus the knives 1 and 2 are actually operated by respective arm pairs 15 .
- -:
..' :
': ` ' `
, ~ . . . .
1~1 166~
and 16, located one inside the other. The two sides of the dobby frame 20 are held together by cross bars 17, 18. Only one repres-entative swing lever 3, with its related elevator 6 and composite lever 24, is shown in the drawings; but usually their number varies from 12 to 24, and all are placed on the same centre to operate selectively in the same manner.
The shedding of the swing lever 3 by knife 1, from the base position in Fig. 2, is done by presenting a stud 10' on the pattern cylinder 10. The stud raises the composite lever 24, and hence the related elevator 6 and hook. The hook is thus engaged by knife 1 on the start of its shedding stroke, and the full motion of the knife is subsequently communicated to the swing lever. When the upper position of the swing lever 3 is reached and knife 1 has just reversed its motion, elevator 6 engages the notch 4, the hook 5 drops on the composite lever 8, and the cycle is repeated from the position of Fig. 1. A close study will reveal that the elevator 6 needs resilient pressure to disengage the hook 5 from knife 2 and also to engage the hook 5 with knife 1. This pressure is supplied by the spring portion 9 of the composite lever.
Fig. 3 shows diagrammatically a ront view of a loom equipped with the present dobby. A string 21 connects each swing lever 3 with a loom harness 22 of loom 23. The mounting arrange-ment lS according to the conventional practice used in negative dobby shedding. The loom harness 22 is biased downwards by spring action, supplied by a bottom motion, and the bias is carried to the swing lever 3 through string 21. The shaft 11 is oscillated 131 166~
at the loom frequency by coupling it with the crank shaEt of the loom through a crank mechanism, (not shown). The crank arm of shaft 11 is shown in dotted lines as it is hidden from the view.
When the shaft 11 is thus oscillated by a simple crank, the two strokes of the drive are equal and the dwell equals a half of the loom cycle. However, if a shorter dwell is required, say for small width looms, the shaft 11 can be made to oscillate by a quick return motion. Such motions are well known and not shown in the present drawings. It is important to note that the drive knives 1 and 2 must operate at different swing angles to deliver the same motion to the swing lever 3. This provision is made while designing the gear ratio between the gears 13 and 14.
It will be noted that the hooks introduced for the selective transmission of motion are comparatively lighter in weight and easier to select than the corresponding components used in dobbies which operate at the loom frequency. Moreover, each motion of the drive commences with a zero acceleration, and the driven components follow the same motion. Another point to note is that the swing levers receive not only the full motion of the drive, bat also oscillate in a wide angle of swing. This is rendered possible by allowing the swing levers and the drive knives to be operated on axes which are either identical or close to each other. In consequence, swing levers of very small length can be used to transmit the full motion required for the shedding purpose, and this same economy is reflected in the rest of the dobby mechanism.
, ~
:
Claims (8)
1. An openshed dwell type dobby for shedding warp harnesses of a weaving loom, comprising:
i) a pair of drive knives which reciprocate out of phase at a full frequency of a related loom between two fixed base positions:
ii) a plurality of swing levers which are rested at said two base positions and are selectively shed from each different of these positions to the other simultaneously by a particular knife of the said pair such that both knives, on completing respective shedding strokes, return concurrently through idle strokes to respective original positions;
iii) swing levers (ii) connected individually to harnesses of said related loom and deliver, on said shedding strokes, the full motion of each knife to the harnesses being shed;
iv) hook means pivoted directly onto each of said swing levers to engage said swing levers with said particular knives from said different positions;
v) means of selection for selectively actuating said hook means from said two base positions according to a given pattern.
i) a pair of drive knives which reciprocate out of phase at a full frequency of a related loom between two fixed base positions:
ii) a plurality of swing levers which are rested at said two base positions and are selectively shed from each different of these positions to the other simultaneously by a particular knife of the said pair such that both knives, on completing respective shedding strokes, return concurrently through idle strokes to respective original positions;
iii) swing levers (ii) connected individually to harnesses of said related loom and deliver, on said shedding strokes, the full motion of each knife to the harnesses being shed;
iv) hook means pivoted directly onto each of said swing levers to engage said swing levers with said particular knives from said different positions;
v) means of selection for selectively actuating said hook means from said two base positions according to a given pattern.
2. A dobby according to claim 1, wherein said loom harnesses connected to the swing levers define the openshed state when the unselected levers, during said shedding strokes, remain at said base positions and their associated hook means remain disengaged from said drive knives.
3. A dobby according to claim 2, wherein the loom harnesses define the dwell state when the related swing levers and their hook means, during said idle strokes, remain disengaged from said drive knives.
4. A dobby according to claim 3, wherein said hook means comprises a two-way hook pivoted onto each swing lever to deliver, when selected, the full motion of either knife to the related loom harness.
5. A dobby according to claim 4, wherein each two-way hook rests on said means of selection and remains disengaged from said knives during the performance of openshed and dwell.
6. A dobby according to claim 5, wherein the means of selection, one for each swing lever and its two-way hook, consists of a composite lever made of two resiliently joined parts actuated according to a given pattern.
7. A dobby according to claim 1, wherein said swing levers and at least one knife of said pair of drive knives are mounted and operated on one and the same common shaft.
8. A dobby according to claim 6, wherein the given pattern is represented by a given arrangement of studs and blanks run on a pattern cylinder.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000550411A CA1311664C (en) | 1987-10-28 | 1987-10-28 | Dobby mechanism |
| IN896DE1988 IN175854B (en) | 1987-10-28 | 1988-10-19 | |
| CN88107383A CN1019824B (en) | 1987-10-28 | 1988-10-27 | Openshe dwell type bobby mechanism |
| BR8805595A BR8805595A (en) | 1987-10-28 | 1988-10-27 | LICOS MACHINERY MECHANISM FOR LOVES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000550411A CA1311664C (en) | 1987-10-28 | 1987-10-28 | Dobby mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1311664C true CA1311664C (en) | 1992-12-22 |
Family
ID=4136738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000550411A Expired - Fee Related CA1311664C (en) | 1987-10-28 | 1987-10-28 | Dobby mechanism |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1019824B (en) |
| BR (1) | BR8805595A (en) |
| CA (1) | CA1311664C (en) |
| IN (1) | IN175854B (en) |
-
1987
- 1987-10-28 CA CA000550411A patent/CA1311664C/en not_active Expired - Fee Related
-
1988
- 1988-10-19 IN IN896DE1988 patent/IN175854B/en unknown
- 1988-10-27 CN CN88107383A patent/CN1019824B/en not_active Expired
- 1988-10-27 BR BR8805595A patent/BR8805595A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034232A (en) | 1989-07-26 |
| IN175854B (en) | 1995-09-30 |
| CN1019824B (en) | 1992-12-30 |
| BR8805595A (en) | 1989-07-11 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |