US3550641A - Arrangement for the monitoring of the insertion of weft threads - Google Patents

Arrangement for the monitoring of the insertion of weft threads Download PDF

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Publication number
US3550641A
US3550641A US759613A US3550641DA US3550641A US 3550641 A US3550641 A US 3550641A US 759613 A US759613 A US 759613A US 3550641D A US3550641D A US 3550641DA US 3550641 A US3550641 A US 3550641A
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Prior art keywords
shuttle
monitoring
arrangement
shuttles
thread
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Expired - Lifetime
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US759613A
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English (en)
Inventor
Edgar H Strauss
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Ruti Machinery Works Ltd
Maschinenfabrik Rueti AG
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Maschinenfabrik Rueti AG
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/26—Travelling-wave-shed looms

Definitions

  • PATENTED UEC29 1970 saw 1 or a ARRANGEMENT FOR THE MONITORING OF THE INSERTION OF WEFI THREADS
  • This invention relates to an arrangement for the monitoring of the insertion of weft threads on a loom, having a monitoring means which serves to detect, at a monitoring point, the presence of weft thread insertions and which can be selectively changed to an operative or nonoperative condition.
  • weft thread monitors which monitor the weft thread during the process of its insertion in a weaving operation. In the majority of cases, monitoring takes place as the result of a cam moving one or more thin needles against the weft thread inserted by a thread inserting member, e.g. a shuttle, directly after this member has passed. When a thread is present, the needle or needles are held by the thread, but otherwise the-needle or needles move on and the loom is stopped. On the other hand, it is also known to determine 1 whether a weft thread is present by optical means.
  • the shed is also relatively small.
  • the space available for carrying out the monitoring is thus correspondingly small.
  • the known monitoring arrangements noted above cannot be used.
  • the mechanical movements of the known arrangements cannot, in the time available, he executed with the necessary accuracy and, on the other hand, the known optical devices are quite unsuitable on account of the space limitations.
  • this invention contemplates an arrangement for. monitoring weft threads characterized in that, for the purpose of inserting weft threads, several inserting members (e.g. shuttles) are movable simultaneously one after the other and the effective or operative condition of the monitoring means begins for each insert ing member during itspassage through a monitoring point or area and the thread-monitoring activity of said mean is held up by the inserting member in question until the inserting member has completely passed through the monitoring point.
  • inserting members e.g. shuttles
  • FIG. 4 illustrates schematically a further embodiment of the and FIG. 5 shows, likewise schematically, the further embodiment of FIG. 4 in front elevation.
  • FIG. I The perspective illustration of a loom shown in FIG. I indicates the position of the arrangement of this invention for monitoring the insertion of the weft threads on a loom.
  • the warp threads 12 run from a warp beam 11 around the guide rollers 13 and 14, a roll 16 and a warp thread monitor 15.
  • the warp threads 12 are formed into a plurality of sheds directly beyond the roller 16; an open shed 17 being present at the position of each pick-inserting member or shuttle 18 and a shed change taking place between each two adjacent shuttles 18.
  • This shed-forming operation is indicated in the drawing by appropriate hatching.
  • For the pur pose of weaving a plurality of shuttles 18 are provided and these move simultaneously through the changing sheds 17 formed during the weaving operation one after the other.
  • shuttles 18 are moved forward by the blades or reed dents 19 member is still positioned at the monitoring point. This results presence of the weft thread, immediately upon the end part of the inserting member passing the monitoring point. Thus, the actual monitoring operation takes place instantaneously after the passage of the inserting member.
  • the arrangement according to the invention also provides for the monitoring of the thread-inserting members.
  • FIG. 1 shows an embodiment of a loom on which the arrangement of this invention for monitoring the insertion of the weft threads is used;
  • FIG. 2 is an elevational view of the arrangement of the invention including a monitoring means as seen from the lefthand side of the loom;
  • FIG. 3 shows a front elevation of the monitoring means shown in FIG. 2;
  • the blades 19 are incorporated in the ar rangement 28 which is firmly secured to the frame 29 of the loom. Two worm shafts (not illustrated) are provided in the arrangement 28 for the purpose of moving the blades 19. Upon rotation of the worm shafts, the blades 19 are swung about an axis in such a way that each blade 19 is continuously moved a little further on, relatively to the preceding blade, in its movement cycle. The blades 19 as a whole thereby provide an undulatory movement, which progresses from right to left and which carries the shuttle 18 along.
  • the sheds 17 also move at same speed from right to left.
  • the woven material 23 is rolled on to the cloth beam 26 by the pull-in roller 24 and the pressure roller 25.
  • a temple is shown schematically by reference numeral 27.
  • the weft thread 31 required for the weaving is drawn from a feed bobbin 2 2.
  • Shuttles 18 are continuously supplied from a shuttle feed 20. At the same time a rotor 21 continuously winds thread 31 on to a stationary blade (not illustrated) on which the turns of thread are arranged as separate coils. By pushing the shuttles 18 over the blade in a direction vertical thereto and by moving them from the blade in the longitudinal direction thereof, the coils are passed to the shuttles, individually.
  • FIGS. 2 and 3 On the side of the loom, at which the shuttles l8 emerge from the sheds, is located an arrangement 30 for monitoring the insertion of the weft threads.
  • the construction of this arrangement is illustrated in detail in FIGS. 2 and 3.
  • the cloth 23, the cloth beat up 33 and the shed 17 can again be seen in FIG. 2.
  • a shuttle 18, Inside the illustrated shed is a shuttle 18, which, in FIG. 2, is moving outwardly away from the plane of the drawings.
  • the end positions of blades 19 or the positions of their maximum swing are shown in broken lines. Of these parts, only the shuttle 18 and the cloth beat up element 33 are shown in FIG. 3. The other parts are omitted for the sake of clarity.
  • the thread 31 is continuously drawn out of them.
  • the arrangement 30 for monitoring the insertion of the weft thread incorporates a plate 34 which is secured by screws to the fixed element 35 of the frame of the loom. At its lower end, the plate 34 carries a rotatable shaft 36. Rigidly connected to the ends of the shaft 36 are the two planar smooth elements or members 37 and 38. In this embodiment, both members 37 and 38 are of the same form.
  • the member 37 acts as a sensor means and serves to probe the weft thread 31.
  • the actuating means or member 38 is provided for actuating the sensor means 37.
  • the spiral spring 39 shown schematically, the members 37 and 38 are continuously tensioned so that, in the illustration of FIG. 2, these elements or means tend to rotate in the anticlockwise direction.
  • the members 37 and 38 are each connected to a second shaft 40.
  • This shaft 40 increases the mechanical stability of the monitoring arrangement 30 and also acts as one pole of an electrical contact.
  • the other pole of this contact is formed by the small plate 41.
  • Plate 41 is adjustable by a screw 42, i.e. the distance between the free end of the plate 41 and the shaft 40 can be set bythe screw 42.
  • Each of the members 37 and 38 has a projection 43. These projections 43 and possibly an additional part or portion of each of the members 37 and 38 move between the warp threads 12 (which form shed 17); the members 37 and 38 being arranged parallel therewith.
  • the actual monitoring of the weft thread insertion takes place at the monitoring point or zone 45, towards which the projecting part 43 of the sensor means 37 is biased by the spring 39.
  • the sensor means 37 When a weft thread 31 is properly inserted from the shuttle 18, the sensor means 37 is held by the thread 31 before the shaft 40 touches the contact plate 41. When, however, no thread 31 is present, the sensor means 37 drops further towards the path of the shuttles 18, and with it the actuating member 38 and the small rod 40. The rod 40 thereby makes contact with the plate 41. Two different electrical voltages are now present in the contacts 40 and 41, so that when the contacts 40 and 41 are touched, an electrical signal is produced by a signal generating means or circuit whereby the stopping of the loom can be brought about, e.g. the signal may be directed to the power input of the loom.
  • shuttle 18 when initially passing the monitoring point will find the projection 43 on sensor means 37 raised and the means 37, 38, 40 swung clockwise against the bias of the spiral spring 39, because the shuttle 18 reaches the member 37 while the shuttle 18a is underneath the member 38.
  • the shuttle 18 will be moved to the left to reach a position between elements 37 and 38 in which the bias of the spring 39 will cause these elements to swing counterclockwise so that sensor means 37 via projection 43 will contact the weft thread extending from the shuttle, if present.
  • the period of sensing is limited to a time interval corresponding to the difference in length between the shuttle and the distance between elements 37 and 38.
  • the length of the shuttle for monitoring purposes is determined by the point of first contact of the shuttle with the projection 43 of element 38 and the point of last contact of the shuttle with the projection 43 of element 37 (which is substantially the trailing end of the shuttle). If the projection 43 of element 37 does not contact a weft thread 31 at the monitoring zone 45, the arrangement will stop the loom. Subsequently, the initial shuttle 18 will contact the actuating member 38 right after it leaves the position of the shuttle 18 shown in FIG. 3, so that the element 40 is again swung in the direction away from contact 41.
  • this monitoring operation can be further improved (i.e. a somewhat earlier commencement of the monitoring can be achieved) when the zone 44 on the shuttle 18 on which the projection 43 on the sensing member 37 comes to bear, is sloped off towards the rear edge of the shuttle 18 by cutting away a portion of the shuttle. In this way, the distance of the projection 43 to the thread 31 when the shuttle 18 slides off becomes still smaller.
  • the sensing means 37 is raised again, ie it must be pressed away again against the action of the spring 39, before the thread 31 is beat up. Otherwise, the absence of the weft thread 31 would obviously be incorrectly indicated. To achieve this, the positioning of the actuating member 38 must'be such that it is raised exactly in the position shown in FIG. 3 or possibly a very short period thereafter.
  • the elements 36 to 40 of the monitoring arrangement are brought to their active condition, e.g. by the shuttle 18a preceding the shuttle 18 when the shuttle 18a releases the member 38. This occurs when the shuttle 18 is passing the monitoring point 45.
  • the thread-monitoring function is then held up further by the shuttle 18 until its end 44 has moved from under the member 37.
  • the elements 36 to 40 of the monitoring arrangement are again brought to their inoperative condition in that the forward part of the shuttle 18 presses the member 38 out of the path of the shuttle against the action of the spring 39.
  • the distance between the members 37 and 38 must be smaller than the distance between two vicinal shuttles 18 as measured between corresponding points of said shuttles.
  • actuating element which is actuated by a shuttle preceding the shuttle 18a.
  • the appropriate actuating element would need to be displaced to the left relatively to the illustrated element 38 by a distance equal to the space between the corresponding shuttle and shuttle 180.
  • the actuating element is fitted in front of the sensing element or means 37. Its position is shown in FIG. 3 by the dot-dash line 46.
  • the sensing element 37 and an actuating element are thus coupled to each other in correspondence with the connection between the shafts 36 and 40. It can be seen that in the operational phase illustrated in FIG. 3, Le. in the illustrated position of the shuttles 18 and 18b, the shuttle 18b is about to press the member out of the path of the shuttles at position 46 and thus to bring the monitoring means into its nonoperative condition.
  • the sensing member 37 Since, when no shuttle is present, the sensing member 37 is likewise pressed into the path of movement of the shuttles l8 until the parts 40 and 41 make contact, i.e. because the action ing of the shuttles I8 to be carried outat the same time.
  • the position of the monitoring arrangev ment 30 along the path of the inserting members 18 is not tied to any particular place. It can be disposed at any given place along this path. Its most favorable position is in fact on the cloth side where the shuttles 18 run out.
  • FIGS. 4 and 5 shown a further embodiment from the side and from the front, respectively.
  • the cloth 23 and the shed 17 are omitted from FIG. 5 for'the sake of clarity,-but the cloth beat up 33 is shown in both FIGS.
  • the two end positions of the pivoting movements of the blades 19 are shown in FIG. 4.
  • a sensing member or means 50 having a projection 51 is provided. No projecting portion is present, however, on the element 52.
  • the sensing member 50 and the element 52 are firmly connected tothe shaft 53 and can be pivoted therewith in bearings 54.
  • An actuating member or means in the form of a plate 55 is carried by the elements 50 and 52.
  • the spring 56 biases the elements 50 and 52 in the anticlockwise direction (as seen in FIG. 4).
  • each of the blades 19 executes a swinging movement about'the shaft 57 shown in FIG. 4.
  • Each blade 19 is moved somewhat farther relatively to the blade immediately preceding it.
  • the blades 19a and 19b execute an upwards movement in the operational phase illustrated in FIG. 5, the blade 19b being moved somewhat farther relatively to the blade 19a immediately preceding it.
  • This upwards movement of the blades 19 causes the shuttles 18 to be moved to the left.
  • the shuttle I8 When, for the purpose of explaining the mode of operation, the shuttle I8 is assumed first to be located further tothe right than in the case in FIG. 5, then it can be readily seen that, at a certain position of the shuttle 18, the blade 190 would be in its highest position of swing. In this position, the horizontal plate 55 on the blade 190 has been raised. When this blade 19c drops, the plate 55 will have been lowered and thus the elements 50 and 52 will have rotated with the shaft 53 a little way in the anticlockwise direction. Since, in this operational condition, the shuttle 18 was, however, below the sensing means 50, then in this condition the projection 51 came to bear on the shuttle I8. If the shuttle l8 isnow moved farther to the left,
  • the projection 5] slides away from it. If a portion of weft thread 31 is present it bears against it. If no thread portion is present, a contact (not illustrated) is closed by movement of the sensing means 50 in an anticlockwise direction and the loom is stopped.
  • the blade 19d Shortly after the projection 51 has slid off the shuttle and before the thread portion 31 is beat up at the monitoring point or area 45, the blade 19d moves towards its highest position of swing. It thereby lifts the actuating member 55 and thus moves the projection 51 out of the path of the shuttles, via the elements 52 and 53, forming a coupling, and the direct connection of the element 50. In this manner the monitoring means is brought into its nonoperative condition.
  • the blade 19d Shortly after the projection 51 has slid off the shuttle and before the thread portion 31 is beat up at the monitoring point or area 45, the blade 19d moves towards its highest position of swing. It thereby lifts the actuating member 55 and thus moves the projection 51 out of the path of the shuttles, via the elements 52 and 53, forming a coupling, and the direct connection of the element 50. In this manner the monitoring means is brought into its nonoperative condition.
  • the arrangement for monitoring the weft thread is therefore not controlled by the shuttle 18, but by the blades 19 that move the shuttles.
  • the shed-forming members can also be used for controlling the arrangement I after the other, along a path through separate sheds formed 'during the weaving operation, said arrangement comprising monitoring means for detemiining the occurrence of a weft thread at a monitoring point on said path and control means responsive to the movement of said shuttles along said path for placing said monitoring means in an operative or nonoperative condition with respect to each shuttle, said control means causing said monitoring means to be in the operative condition for each shuttle carrying a weft thread during the travel of that shuttle past the monitoring point and the thread monitoring function of the monitoringmeans being delayed by the shuttle until it is past the monitoring point.
  • the monitoring means comprises a sensingmember
  • said control means comprises an actuating member and a coupling member
  • said sensing member being biased towards the monitoring point, being movable over said monitoring point and being connected to the actuating member by said coupling member
  • said actuating member is actuated by the shuttles, whereby in the nonoperative condition of the monitoring means the sensing member is pressed away from the monitoring point by said coupling member in the direction opposite to that in 5.
  • sensing member and the actuating member are rigidly interconnected and are biased towards the path of the shuttles and the actuating member is located at a point which is so selected that it ceases to bear on the shuttle moving past it during each period when the shuttle with the weft thread to be monitored by the sensing member is located beneath the sensing member.
  • sensing member and the actuating member each comprise a planar element that has a face positioned vertically to the path of movement of the shuttles, said elements being rigidly coupled with each other and being pivoted about a shaft disposed parallel with the path of movement of the shuttles and each having a projection which extends towards the path of the shuttles.
  • the monitoring means comprises a sensing member
  • the control means comprises an actuating member and a coupling member, said sensing member being biased towards the monitoring point, being movable over said monitoring point, and being connected to the actuating member by said coupling member; and said actuating member is actuated by the drive means, said actuating member extending over a zone along the drive means and being arranged to be displaced by the drive means, whereby the sensing member can be pressed away from the monitoring point by the coupling member and the monitoring means can be placed in its nonoperative condition.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US759613A 1967-09-21 1968-09-13 Arrangement for the monitoring of the insertion of weft threads Expired - Lifetime US3550641A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1323267A CH459098A (de) 1967-09-21 1967-09-21 Anordnung zur Überwachung des Schussfadeneintrages

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US3550641A true US3550641A (en) 1970-12-29

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US (1) US3550641A (de)
AT (1) AT297623B (de)
BE (1) BE720825A (de)
CH (1) CH459098A (de)
DE (1) DE1785392C3 (de)
FR (1) FR1581301A (de)
GB (1) GB1214727A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891011A (en) * 1973-01-29 1975-06-24 Southern Weaving Co Filling detecting device for narrow fabric loom

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS148467B1 (de) * 1970-04-28 1973-02-22
US4085777A (en) * 1973-07-24 1978-04-25 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Arrangement for the control of weft introduced into looms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891011A (en) * 1973-01-29 1975-06-24 Southern Weaving Co Filling detecting device for narrow fabric loom

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Publication number Publication date
CH459098A (de) 1968-06-30
DE1785392C3 (de) 1975-05-07
GB1214727A (en) 1970-12-02
DE1785392A1 (de) 1972-02-10
DE1785392B2 (de) 1974-09-19
BE720825A (de) 1969-02-17
FR1581301A (de) 1969-09-12
AT297623B (de) 1972-04-10

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