US3865150A - Braking device for a shuttle in a weaving machine - Google Patents

Braking device for a shuttle in a weaving machine Download PDF

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US3865150A
US3865150A US366523A US36652373A US3865150A US 3865150 A US3865150 A US 3865150A US 366523 A US366523 A US 366523A US 36652373 A US36652373 A US 36652373A US 3865150 A US3865150 A US 3865150A
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brake
shuttle
braking
shoe
braking device
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US366523A
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Hans Demuth
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Sulzer AG
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Sulzer AG
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    • 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
    • D03D49/52—Shuttle boxes

Definitions

  • the brake device has been constructed with a brake part which is adapted to press against the shuttle and is mounted on a brake member.
  • the brake member has usually been mounted to reciprocate vertically in synchronism with the weaving machine to cause pressing of the brake part against the shuttle at preset times.
  • a brake device of this type has holding plates which are screwed onto both sides of the brake member as well as guide shoes which are formed at the free ends of such plates to guide the shuttle.
  • a plastic brake part and a rubber buffer are clamped between the guide shoes and are located between the brake part and the brake member.
  • guide ledges are provided at the front end of the guide shoe for directing the shuttle entering into the brake device. Consequently, a large number of different parts made of different materials are secured to the brake member.
  • the parts which are secured to the brake member experience fairly heavy wear because of friction and heating and therefore have to be replaced at various times. If replacement is not carried out in good time, the shuttle ceases to be guided and centered accurately when entering the brake device. The shuttle stop position therefore ceases to be accurately defined, with repercussions on the accuracy of other events in the machine. The parts which are fitted to the brake member must therefore be replaced in good time. Since the dismantling and adjustment of new parts entail difficulties and require expert knowledge, it sometimes occurs that parts which are not fully worn are replaced. Therefore, the number of interruptions in operation is higher than strictly necessary.
  • the invention provides a braking device for braking a shuttle in a weaving machine comprising a brake member for reciprocally moving relative to a shuttle path and a one-piece brake shoe mounted on the brake member.
  • the one-piece brake shoe includes a brake part or braking surface for pressing against the shuttle and guide shoes or jaws on opposite sides of the brake part for guiding the shuttle therebetween.
  • the invention thus provides fewer separate items for fitting to the brake member than in the known devices.
  • the braking device can be such that when worn parts are replaced, only one item, namely the brake shoe, needs to be replaced. Dismantling, and adjustment of the new brake shoe, are very simple operations.
  • the brake shoe engages around the brake member by means of holding plates which are formed on and are unitary with the brake shoe and which. serve to secure the brake shoe to the brake member.
  • the holding plates have ledges which engage in grooves in the brake member.
  • the brake shoe is made of plastics.
  • the volume of resilient material can be increased considerably, giving softer guidance and improved centering of the shuttle as well as more accurate definition of the shuttle stop position.
  • the softer guidance damps shuttle oscillations, thus reducing the risk of the picked weft yarn being lost because of an oscillating yarn clamp (lost yarn).
  • FIG. 1 illustrates a sectional view through a conventional brake device of a gripper shuttle weaving machine
  • FIG. 2 illustrates a view taken on line II-II of FIG.
  • FIG. 3 illustrates a sectional view of a braking device according to the invention corresponding to the bottom part of FIG. 2;
  • FIG. 4 illustrates a side view of the braking device of FIG. 3
  • FIG. 5 illustrates an alternative form of the bottom part of FIG. 3
  • FIG. 6 illustrates another feature of a braking device according to the invention.
  • FIG. 7 illustrates a side view of the device of FIG. 6.
  • a conventional weaving machine catching mechanism which is covered by a cover 1, includes a guide 2 in which a brake member 3 of substantially square cross-section can reciprocate vertically.
  • the brake member 3 has two forked ends 4 at the top, and a toggle joint 6 driven by a drive rod 5 is disposed between the ends 4.
  • the toggle joint 6 connects a stationary block 11 to the brake member 3.
  • the height of the block 11 can be adjusted by means of a screw 9.
  • the rod 5 Before each entry of shuttle 12in the catcher mechanism, the rod 5 is moved by the machine drive into the position shown in FIG. 2, in which the toggle joint 6 is in an extended position, the parts which will be described hereinafter and which are disposed on the bottom of the brake member 3 are in the braking position. The rod 5 then moves to the right as viewed in FIG. 2 causing the toggle joint 6 to bend and the brake member and the other parts of the brake to rise so thatthe shuttle 12 can go on to other operations.
  • Guide plates 17 are also clamped between the plates 14 and the member 3. Those ends of the plates 17 which are on the right in FIG. 1 from guide ledges 18 for the entering shuttle while the plates 14 form guide jaws 19 at the bottom.
  • a stationary brake plate 21 is disposed below the shuttle.
  • the braking device of the invention has a brake member 3 which carries a onepiece brake shoe 31 made of a resilient plastics on the bottom.
  • the brake shoe 31 comprises a braking surface 150 corresponding to the brake part 15, guide jaws 19a corressponding to the jaws 19, a pad 16a corresponding to the pad 16, plate-like holding or retaining parts 140 corresponding to the plates 14, and ledges 18a corresponding to the ledges 18.
  • the plate-like parts 14a i.e. holding plates engage around the bottom part of the brake member 3 and have ledges 32 at their top ends adapted to engage in grooves 33 in the brake member 3.
  • the shoe 31 Due to the resilience of the material used for the brake shoe 31, the shoe 31 can be pushed onto the bottom end of the brake member 3 and be self-retaining.
  • the screws 13 can be omitted or else used simply as a safeguard.
  • a space 34 is left between the lowest part of the brake member 3 and the pad a to enable the brake shoe 31 to be resilient.
  • the shoe 31 is also formed with bores 35 for the same purpose.
  • the brake shoe 31 has bevelled surfaces 36 to brake the shuttle 12, shown in chain-dotted lines in FIG. 3. Consequently, the specific braking pressure acting on the brake shoe 31 can be less than in the construction shown in FIGS. 1 and 2, an important consideration in the light of the cold flow of plastics subjected to high pressures.
  • the brake shoe 31a is formed with side recesses 37 to increase the resilience of the plastics material.
  • the one-piece brake shoe 31b comprises merely the brake surface 15a, the jaws 19a and the ledges 18a.
  • This brake shoe 31b is made of plastics and is retained by means of top ledges or the like 41 in metal holding plates 14a which fit into appropriate grooves 42 in the shoe 31b.
  • the brake shoe 31b is formed with grooves 43 in which projections 44 on the plates 14a engage, to prevent the brake shoe 31b from shifting to the left as viewed in FIG. 7 as a result of the braking action on the shuttle.
  • a braking device for braking a shuttle in a weaving machine comprising a brake member for reciprocally moving relative to a shuttle path;
  • a one-piece brake shoe mounted on said brake member, said brake shoe including a braking surface for pressing against a shuttle and guide jaws disposed on opposite sides of said braking surface for guiding a shuttle therebetween.
  • each holding plate has at least one ledge and said brake member has a plurality of grooves, each groove receiving a respective ledge.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Braking Arrangements (AREA)

Abstract

The braking device uses a one-piece plastics braking shoe to brake a shuttle. The shoe includes a braking part to engage the shuttle and guide shoes to guide the shuttle under the braking part. The shoe can include integral holding plates for securing the shoe to a reciprocating brake member or can cooperate with separable holding plates of metal for the same purpose.

Description

0 Muted States Patent 1 91 1111 3,865,150
Demuth 1 Feb. 11, 11975 [54] BRAKING DEVICE FOR A SHUTTLE IN A 2,538,798 l/l951 Pfarrwaller 139/125 2,693,830 11/1954 Darash 139/126 WEAVING MACHINE I 2,713,357 7/1955 Peterson 139/186 [75] lnventor: Plans Demuth. Wmterthur. 3,014,505 12/1961 Herard et a1 139/126 Switzerland 3,124,166 3/1964 Pfarrwaller 139/185 X [73] Assignee: Sulzer Brothers Ltd., Winterthur,
Switzerland Primary Examiner-James Kee Chi Attorney, Agent, or Firm-Keny0n & Kenyon Reilly [22] Flled. June 4, 1973 Carr & Chapin [21] App]. No.: 366,523
[30] Foreign Application Priority Data [57] ABSTRACT June 20, 1972 Switzerland 9241/72 Th b ki d i e uses a one-piece plastics braking shoe to brake a shuttle. The shoe includes a braking [52] US. Cl. 139/185, 139/125 part to engage the Shuttle and guide shoes to guide the [51] Kill. (:1 D03d 49/54 Shuttle under the braking part. The Shoe can include [58] Field 01 Search 139/185-187, integral holding plates f securing the Shoe to a recip 139/183 126 rocating brake member or can cooperate with separable holding plates of metal for the same purpose. [56] References Clted UNITED STATES PATENTS 6 Claims, 7 Drawing Figures 2,271,205 1/1942 Pfarrwaller 139/187 X BRAKING DEVICE FOR A SHUTTLE IN A WEAVING MACHINE This invention relates to a braking device for a shuttle in a weaving machine.
Heretofore, weaving machines which use gripper shuttles for picking elements and in which a weft package remains outside a shed during operation, generally have the shuttles move through the shed at very high picking speeds. As a result, rather high amounts of kinetic energy must be absorbed in bringing the shuttles to a stop after passing through the shed. To this end, various types of brake devices have been used. In some instances, the brake device has been constructed with a brake part which is adapted to press against the shuttle and is mounted on a brake member. The brake member has usually been mounted to reciprocate vertically in synchronism with the weaving machine to cause pressing of the brake part against the shuttle at preset times. Generally, a brake device of this type has holding plates which are screwed onto both sides of the brake member as well as guide shoes which are formed at the free ends of such plates to guide the shuttle. In addition, a plastic brake part and a rubber buffer are clamped between the guide shoes and are located between the brake part and the brake member. Also, guide ledges are provided at the front end of the guide shoe for directing the shuttle entering into the brake device. Consequently, a large number of different parts made of different materials are secured to the brake member.
In operation, the parts which are secured to the brake member experience fairly heavy wear because of friction and heating and therefore have to be replaced at various times. If replacement is not carried out in good time, the shuttle ceases to be guided and centered accurately when entering the brake device. The shuttle stop position therefore ceases to be accurately defined, with repercussions on the accuracy of other events in the machine. The parts which are fitted to the brake member must therefore be replaced in good time. Since the dismantling and adjustment of new parts entail difficulties and require expert knowledge, it sometimes occurs that parts which are not fully worn are replaced. Therefore, the number of interruptions in operation is higher than strictly necessary.
Accordingly, it is an object of the invention to provide a braking device of relatively long life.
It is another object of the invention toprovide a braking device of simple construction for use in a weaving machine.
It is another object of the invention to reduce the downtime of a weaving machine due to brake replace-' ment.
It is another object of the invention to provide a braking device of relatively few parts.
It is another object of the invention to provide a shuttle braking device which can be quickly and easily replaced in a weaving machine.
Briefly, the invention provides a braking device for braking a shuttle in a weaving machine comprising a brake member for reciprocally moving relative to a shuttle path and a one-piece brake shoe mounted on the brake member. The one-piece brake shoe includes a brake part or braking surface for pressing against the shuttle and guide shoes or jaws on opposite sides of the brake part for guiding the shuttle therebetween.
The invention thus provides fewer separate items for fitting to the brake member than in the known devices. The braking devicecan be such that when worn parts are replaced, only one item, namely the brake shoe, needs to be replaced. Dismantling, and adjustment of the new brake shoe, are very simple operations.
According to a feature of the invention, the brake shoe engages around the brake member by means of holding plates which are formed on and are unitary with the brake shoe and which. serve to secure the brake shoe to the brake member. Conveniently, the holding plates have ledges which engage in grooves in the brake member. According to :a feature of the invention, the brake shoe is made of plastics.
More particularly, in the case of a plastics brake shoe, the volume of resilient material can be increased considerably, giving softer guidance and improved centering of the shuttle as well as more accurate definition of the shuttle stop position. The softer guidance damps shuttle oscillations, thus reducing the risk of the picked weft yarn being lost because of an oscillating yarn clamp (lost yarn).
These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:
FIG. 1 illustrates a sectional view through a conventional brake device of a gripper shuttle weaving machine;
FIG. 2 illustrates a view taken on line II-II of FIG.
FIG. 3 illustrates a sectional view of a braking device according to the invention corresponding to the bottom part of FIG. 2;
FIG. 4 illustrates a side view of the braking device of FIG. 3;
FIG. 5 illustrates an alternative form of the bottom part of FIG. 3;
FIG. 6 illustrates another feature of a braking device according to the invention; and
FIG. 7 illustrates a side view of the device of FIG. 6.
Referring to FIGS. 1 and 2, a conventional weaving machine catching mechanism, which is covered by a cover 1, includes a guide 2 in which a brake member 3 of substantially square cross-section can reciprocate vertically. The brake member 3 has two forked ends 4 at the top, and a toggle joint 6 driven by a drive rod 5 is disposed between the ends 4. By way of two links 7,
8 the toggle joint 6 connects a stationary block 11 to the brake member 3. The height of the block 11 can be adjusted by means of a screw 9.
Before each entry of shuttle 12in the catcher mechanism, the rod 5 is moved by the machine drive into the position shown in FIG. 2, in which the toggle joint 6 is in an extended position, the parts which will be described hereinafter and which are disposed on the bottom of the brake member 3 are in the braking position. The rod 5 then moves to the right as viewed in FIG. 2 causing the toggle joint 6 to bend and the brake member and the other parts of the brake to rise so thatthe shuttle 12 can go on to other operations.
Secured to the bottom of the brake member 3 by means of screws 13 and holding plates 14 are a platelike brake part 15 and a rubber pad 16 above the part 15. Guide plates 17 are also clamped between the plates 14 and the member 3. Those ends of the plates 17 which are on the right in FIG. 1 from guide ledges 18 for the entering shuttle while the plates 14 form guide jaws 19 at the bottom. A stationary brake plate 21 is disposed below the shuttle.
When the shuttle 12 has entered the catching mechanism l in the direction indicated by an arrow 22 and has been braked, the brake is released via rod 5. The shuttle is then moved back to the right as viewed in FIG. 1 by a drawback device (not shown) into an exactly equal position and then conveyed by an ejector mechanism (not shown) into a curved ejection guide 23 for return to the packing mechanism and a further passage through the shed.
Referring to FIGS. 3 and 4, the braking device of the invention has a brake member 3 which carries a onepiece brake shoe 31 made of a resilient plastics on the bottom. The brake shoe 31 comprises a braking surface 150 corresponding to the brake part 15, guide jaws 19a corressponding to the jaws 19, a pad 16a corresponding to the pad 16, plate-like holding or retaining parts 140 corresponding to the plates 14, and ledges 18a corresponding to the ledges 18. The plate-like parts 14a, i.e. holding plates engage around the bottom part of the brake member 3 and have ledges 32 at their top ends adapted to engage in grooves 33 in the brake member 3.
Due to the resilience of the material used for the brake shoe 31, the shoe 31 can be pushed onto the bottom end of the brake member 3 and be self-retaining. The screws 13 can be omitted or else used simply as a safeguard.
A space 34 is left between the lowest part of the brake member 3 and the pad a to enable the brake shoe 31 to be resilient. The shoe 31 is also formed with bores 35 for the same purpose.
The brake shoe 31 has bevelled surfaces 36 to brake the shuttle 12, shown in chain-dotted lines in FIG. 3. Consequently, the specific braking pressure acting on the brake shoe 31 can be less than in the construction shown in FIGS. 1 and 2, an important consideration in the light of the cold flow of plastics subjected to high pressures.
Referring to FIG. 5, the brake shoe 31a is formed with side recesses 37 to increase the resilience of the plastics material.
Referring to FIGS. 6 and 7, the one-piece brake shoe 31b comprises merely the brake surface 15a, the jaws 19a and the ledges 18a. This brake shoe 31b is made of plastics and is retained by means of top ledges or the like 41 in metal holding plates 14a which fit into appropriate grooves 42 in the shoe 31b. Also, the brake shoe 31b is formed with grooves 43 in which projections 44 on the plates 14a engage, to prevent the brake shoe 31b from shifting to the left as viewed in FIG. 7 as a result of the braking action on the shuttle.
What is claimed is: 1. A braking device for braking a shuttle in a weaving machine comprising a brake member for reciprocally moving relative to a shuttle path; and
a one-piece brake shoe mounted on said brake member, said brake shoe including a braking surface for pressing against a shuttle and guide jaws disposed on opposite sides of said braking surface for guiding a shuttle therebetween.
2. A braking device as set forth in claim 1 wherein said brake shoe further includes a pair of integral holding plates disposed on opposite sides of said brake member and securing said brake shoe to said brake member.
3. A braking device as set forth in claim 2 wherein each holding plate has at least one ledge and said brake member has a plurality of grooves, each groove receiving a respective ledge.
4. A braking device as set forth in claim 3 wherein said brake shoe is made of plastics.
5. A braking device as set forth in claim 4 wherein said holding plates resiliently engage said brake member thereon.
6. A braking means as set forth in claim 1 wherein said brake shoe is made of plastics.

Claims (6)

1. A braking device for braking a shuttle in a weaving machine comprising a brake member for reciprocally moving relative to a shuttle path; and a one-piece brake shoe mounted on said brake member, said brake shoe including a braking surface for pressing against a shuttle and guide jaws disposed on opposite sides of said braking surface for guiding a shuttle therebetween.
2. A braking device as set forth in claim 1 wherein said brake shoe further includes a pair of integral holding plates disposed on opposite sides of said brake member and securing said brake shoe to said brake member.
3. A braking device as set forth in claim 2 wherein each holding plate has at least one ledge and said brake member has a plurality of grooves, each groove receiving a respective ledge.
4. A braking device as set forth in claim 3 wherein said brake shoe is made of plastics.
5. A braking device as set forth in claim 4 wherein said holding plates resiliently engage said brake member thereon.
6. A braking means as set forth in claim 1 wherein said brake shoe is made of plastics.
US366523A 1972-06-20 1973-06-04 Braking device for a shuttle in a weaving machine Expired - Lifetime US3865150A (en)

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CH924172A CH553269A (en) 1972-06-20 1972-06-20 BRAKING DEVICE FOR PROTECTING A WEB MACHINE.

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JP (1) JPS523500Y2 (en)
CH (1) CH553269A (en)
DE (1) DE2234180C3 (en)
FR (1) FR2189556B1 (en)
GB (1) GB1431808A (en)
IT (1) IT989338B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060103A (en) * 1976-03-29 1977-11-29 Aktiengesellschaft Adolph Saurer Brakeshoe for shuttle brakes of looms
US4460021A (en) * 1982-05-07 1984-07-17 Sulzer Brothers, Limited Catcher and a method of operating a gripper projectile catcher
US4669511A (en) * 1985-01-16 1987-06-02 Sulzer Brothers Limited Projectile brake for a weaving machine
US4669512A (en) * 1985-01-28 1987-06-02 Sulzer Brothers Limited Brake for a projectile in a weaving machine
US4674544A (en) * 1985-01-28 1987-06-23 Sulzier Brothers Weaving machine projectile brake
US4832089A (en) * 1987-03-05 1989-05-23 Sulzer Brothers Limited Projectile-catching brake for a loom
US4872487A (en) * 1987-03-05 1989-10-10 Sulzer Brother Limited Projectile-catching brake for a loom
US4892121A (en) * 1988-07-14 1990-01-09 Niagara Lockport Industries Inc. Bladder type shuttle braking apparatus for looms

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271205A (en) * 1938-07-02 1942-01-27 Tefag Textil Finanz Ag Shuttle box
US2538798A (en) * 1951-01-23 Pfarrwaller
US2693830A (en) * 1951-05-29 1954-11-09 Warner Swasey Co Shuttle expeller for weaving machines
US2713357A (en) * 1953-05-27 1955-07-19 Crompton & Knowles Loom Works Shuttle check for loom
US3014505A (en) * 1959-09-08 1961-12-26 Crompton & Knowles Corp Looms operating with stationary weft supplies
US3124166A (en) * 1964-03-10 Shuttle receiving mechanism for gripper shuttle looms

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR676425A (en) * 1929-06-08 1930-02-22 Device for receiving loom shuttles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538798A (en) * 1951-01-23 Pfarrwaller
US3124166A (en) * 1964-03-10 Shuttle receiving mechanism for gripper shuttle looms
US2271205A (en) * 1938-07-02 1942-01-27 Tefag Textil Finanz Ag Shuttle box
US2693830A (en) * 1951-05-29 1954-11-09 Warner Swasey Co Shuttle expeller for weaving machines
US2713357A (en) * 1953-05-27 1955-07-19 Crompton & Knowles Loom Works Shuttle check for loom
US3014505A (en) * 1959-09-08 1961-12-26 Crompton & Knowles Corp Looms operating with stationary weft supplies

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060103A (en) * 1976-03-29 1977-11-29 Aktiengesellschaft Adolph Saurer Brakeshoe for shuttle brakes of looms
US4460021A (en) * 1982-05-07 1984-07-17 Sulzer Brothers, Limited Catcher and a method of operating a gripper projectile catcher
US4669511A (en) * 1985-01-16 1987-06-02 Sulzer Brothers Limited Projectile brake for a weaving machine
US4669512A (en) * 1985-01-28 1987-06-02 Sulzer Brothers Limited Brake for a projectile in a weaving machine
US4674544A (en) * 1985-01-28 1987-06-23 Sulzier Brothers Weaving machine projectile brake
US4832089A (en) * 1987-03-05 1989-05-23 Sulzer Brothers Limited Projectile-catching brake for a loom
US4872487A (en) * 1987-03-05 1989-10-10 Sulzer Brother Limited Projectile-catching brake for a loom
US4892121A (en) * 1988-07-14 1990-01-09 Niagara Lockport Industries Inc. Bladder type shuttle braking apparatus for looms

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Publication number Publication date
FR2189556B1 (en) 1977-02-11
IT989338B (en) 1975-05-20
JPS523500Y2 (en) 1977-01-25
GB1431808A (en) 1976-04-14
CH553269A (en) 1974-08-30
JPS4949267U (en) 1974-04-30
FR2189556A1 (en) 1974-01-25
DE2234180B2 (en) 1974-04-18
DE2234180A1 (en) 1974-01-17
DE2234180C3 (en) 1974-11-21

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