Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
  • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
  • B65H59/20—Co-operating surfaces mounted for relative movement
  • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
  • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
  • B65H59/20—Co-operating surfaces mounted for relative movement
  • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
  • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
  • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
  • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/30—Handled filamentary material
  • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

• the invention relates to a thread brake specified in the preamble of patent claim s 1.
• Such mechanical thread brakes are, for example, between a supply spool and one
• Thread storage device common to generate a certain tension in the running thread and to keep this tension relatively constant.
• Motion detectors are also used to monitor the thread, which indicate when the thread is moving or e.g. due to a malfunction that comes to a standstill.
• Thread brakes are used, the thread pushing a resilient body away from the support surface in the barrel, which presses and brakes the thread against the support surface.
• the invention has for its object a Thread brake of the type mentioned to create, which with an extremely simple structure between the two functions, ie the thread brake and the motion detection function, does not require a compromise and allows the response behavior for both functions to be set independently of one another.
• the thread brake should also
• the thread brake has an extremely simple structure.
• the thread brake hardly differentiates itself from the reliable and simple mechanical thread brakes.
• the reaction force from the re-loading of the running thread is used to generate a relative movement between the holder and the carrier, which the position sensor for signaling monitors exactly.
• the braking function is not only independent of the motion detection function, ie. simple and precisely adjustable as before, but the motion detection function and its sensitive adjustability remain independent of the braking function. This is because physical motion-induced reaction force, which occurs when braking, is used, at least in part, for motion detection.
• Another important advantage is that the position of the holder monitoring position sensor can be set so that the useful signal indicating a fault is already generated before the thread has come to a standstill.
• a further, advantageous embodiment, in which the holder can be moved approximately parallel to the running direction of Faoens, can be seen from claim 5.
• the relative position of the friction element to the running thread is maintained regardless of the relative position between the holder and the carrier.
• the holding arm simultaneously takes on the function of a spring that applies the reference force, which the reaction counteracts from the rubbing of the running thread.
• the embodiment according to claim 7 is also advantageous.
• the two functions of the thread brake can be adapted very precisely to the respective requirements.
• the thread brake is adjustable as usual.
• the movement function is also independently adjustable in a wide range between "sensitive” and “insensitive”. High reliability, extensive maintenance . It and compact dimensions are achieved in the embodiment according to claim 8.
• the position sensors are commercially available, inexpensive, energy-saving and small components.
• 1 + 2 is a side view and a
• a thread brake B according to FIGS. 1 and 2 contains a friction element R which acts on the running thread Y with friction and which is arranged with a holder H in a stationary carrier T. It is a disk brake with plate-shaped disks 4, 5 pressed against each other by a spring 3, on an axis 7 lying transversely to the running direction of the thread Y. The pretension of the spring 3 and thus also the braking action is adjustable by means of a nut 19.
• the thread Y runs through the thread brake B from right to left in FIGS. 1 and 2. It is removed from a thread spool 2 and inserted into an inlet 6 which e.g. is the inlet end of the opening tube of a thread storage device, not shown.
• the thread storage device pulls the thread with a thread tension Fa, which is controlled by the friction element R and kept largely constant. On the inlet side of the friction element R there is a lower thread tension Fi in the running thread Y.
• the axis 7 is attached to a holding arm 8 which can be pivoted about a lower transverse axis 14.
• the transverse axis 14 is defined by a pivot 9 on the carrier T in a bearing 15.
• the holding arm 8 is attached to the shaft 9 at one end.
• a lever 10 is fastened, which encloses an angle of approximately 90 ° with the holding arm 8 and carries a flag 17 at the free end.
• a spring 12 anchored to the carrier T acts on the lever 19 and loads the friction element R with a reference force opposite to the reaction force from the frictional action of the thread Y.
• the spring 12 (not shown) can be adjustable in its spring force.
• a position sensor S is arranged in the carrier, which is, for example, an opto-electronic sensor 11 with a light barrier 18.
• the flag 17 releases the light barrier in the rest position shown. If, on the other hand, the friction element R is pivoted counterclockwise under the reaction force from the frictional action of the running thread Y up to the limit stop 20, the light barrier is interrupted when the position of the friction element can be precisely determined. From this a strong useful signal can be derived to report movement of a correct thread run.
• the thread brake B functions like a conventional thread brake.
• the spring 12 can also be set so that the friction element R is pivoted with the holding arm 8 while the thread is running only in intermediate positions between the two limit stops and also interrupts the light barrier 18. This also represents a correct thread run. If there is a disruption in the thread course, for example due to thread breakage, an obstacle to movement in the thread path, a hanging of the thread on an obstacle, or the like, the thread speed is initially reduced. The difference between the thread tensions Fa and Fi decreases, and also the reaction force from the rebeetzschlagung until finally the spring 12 is able to move the lever 10 against the limit stop 13 to the rest position.
• the light barrier 18 When moving to the rest position, the light barrier 18 is released and a signal as a fault indicator generated. Depending on the setting of the position sensor S, the signal is only generated in the rest position or in advance of it, ie before the thread has come to a complete standstill.
• the friction element R consists of two leaf springs 4 ', 5' pressed against each other by the force of a schematically indicated spring 3 ', between which the thread Y running from right to left is pulled through and braked.
• the friction element R is attached to a holding arm 8 ′ designed as an angle lever, which can be pivoted about the transverse axis 14 in the carrier T.
• the spring 12 engages on the holding arm 8 1 and pulls it in the direction of the limit stop 13 defining the rest position on the carrier T.
• the pretension of the spring 12 (size of the reference force which the friction element opposes to the reaction force from the frictional action of the running thread loaded, is adjustable by means of a screw 19.
• the flag 17 is attached directly to the holding arm 8 'and cooperates with the position sensor S in the aforementioned manner.
• the second limit stop 20 could also be omitted; then the friction element works, so to speak, floating against the spring 12. In the rest position, in or in front of the signal representing a disturbance wi rd generated by the position sensor, the friction element R, however, only arrives at or shortly before a thread position.
• the thread brake B is a crocodile brake, in which the friction element R consists of two claws 4 ', 5' which can be swiveled about axes Y perpendicular to both sides of the thread Y and have thread eyelets 21 and 22 arranged therein.
• the claws 4 ", 5" are spread apart like a forceps by spring force.
• the thread runs through the mutually offset thread eyelets 21, 22 z i ck-zac k-shaped g and from left to right, is thereby deflected and braked.
• Front and rear, fixed thread eyelets 23, 24 ensure the longitudinal guidance of the thread Y.
• a plate 27 with bearing blocks 25 is used to hold the friction element R. the axes 26.
• the plate 27 is guided in a linear guide 28 of the carrier T so as to be displaceable approximately parallel to the running direction of the thread Y.
• the spring 12 pushes the plate 27 to the left to the limit stop 13, (rest position).
• the position sensor S is attached to the carrier T (optoelectronic sensor 11), the light barrier 18 of which can be covered by the flag 17.
• the friction element R is attached to the holding arm S ", which is mounted in the stationary carrier T.
• the holding arm 8" is designed as a spiral spring 29, which is fastened with a foot part 30 to the carrier T, which is designed as a plate 31.
• Mounted on the holding arm 8 " is the lever 10, which activates the position sensor S with the flag 17.
• the bending spring 29 When the thread Y runs from left to right, the bending spring 29 is bent with the reaction force from the frictional action of the thread Y, so that the friction element R is A limit stop 13 can be provided for the rest position, or alternatively the flexibility of the spiral spring can also be responsible for locating and maintaining the rest position
• the flag 17 covers the light barrier of the position sensor S. The signal generated then represents the correct thread run. As long as this signal is present, there has been no disturbance in the thread run. If the thread comes to a standstill, the spiral spring 29 stretches and pulls the flag 17 upwards until it is in the rest position or shortly before the light barrier is released and there is a signal that is clearly distinguishable from the previous signal, the one Represents disorder.
• the two functions: thread braking and motion detection do not influence one another.
• the thread brake can be fine-tuned to suit the respective requirements.
• the motion detection function has the advantage that a fault indicating signal Cutout friedlich 'depending on the position of the support is produced and therefore do not depend on whether the monitored thread is actually come to a stop or has no voltage. Then it is possible to generate the fault signal before the thread has completely come to a standstill. It is also advantageous that by returning the friction element R to the rest position in the event of a malfunction, the thread part running out of the thread brake is withdrawn, which can be important in a thread store to which the thread brake is placed directly at the inlet.
• the position sensor S can be an opto-electronic sensor, an inductive or a Hall sensor. It is also conceivable, however, to use a simple electrical limit switch or a spring loaded spring spring, the spring of which is at the same time the spring which loads the holder against the reaction force from the frictional action of the thread.
• each of the above-mentioned embodiments of the thread brakes can carry out a tension monitoring function and respond to the thread tension.

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• Tension Adjustment In Filamentary Materials (AREA)
• Engineering & Computer Science (AREA)
• Quality & Reliability (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20375292

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (7)

• 1989
  • 1989-03-09 SE SE8900839A patent/SE8900839D0/sv unknown
• 1990
  • 1990-03-09 WO PCT/EP1990/000385 patent/WO1990010593A1/de unknown

Patent Citations (7)

Non-Patent Citations (1)

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