Textiles: spinning – twisting – and twining – Apparatus and processes – Covering or wrapping
Patent
1990-09-04
1992-05-12
Stodola, Daniel P.
Textiles: spinning, twisting, and twining
Apparatus and processes
Covering or wrapping
57 3, D02G 336, D07B 714
Patent
active
051116464
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for placing at least one tape around a continuous strand of material, particularly for putting tape around a cable, the device being provided with a driven tape feeding device for the tape which rotates about the longitudinal axis of the strand and includes a tape reel.
Continuous strands of material, particularly cables, are encased in one or two tapes of paper, plastic, metal and/or fabric made of fibers or metal wires. In many cases, the thus wound or taped strand of material is subsequently provided with an additional plastic sheath. The application of the plastic sheath is effected by way of coextrusion, that is, the taped strand of material is conducted through an appropriately configured extruder. The tape length required for taping is greater by a multiple than the length of the strand of material, so that the device as a whole must be stopped each time and held at a standstill until the empty tape reel has been exchanged (for) a full tape reel and the outgoing tape end has been connected with the incoming tape end. Since the extruder must be kept at its required temperature during the time of the standstill, the practice in the past has been to continuously draw plastic material through a discharge conduit during the period of standstill to thus prevent damage due to overheating to the plastic in the extruder itself and to the already applied plastic sheath still in the region of the extruder nozzle. Aside from the considerable losses in plastic occurring during the standstill period, there also exists the danger that, due to the influence of greater heat during the standstill period, the sheathing will be damaged.
SUMMARY OF THE INVENTION
It is the object of the invention to configure a device of the above-identified type so that continuous operation and, at the same time, an exchange of reels and the joining of the tape end and the tape beginning is possible during operation.
This is accomplished according to the invention in that at least two tape reels are provided which are each supported on a reel carrier that is mounted so as to rotate independently of the tape feeding device and coaxially with the strand of material. Each reel carrier has an associated releasable coupling so as to connect it with the tape feeding device in a manner secure against rotation and each reel carrier is provided with a device to guide the leading tape end. In such a device, the tape feeding device is composed, for example, of a rotor which rotates coaxially about the longitudinal axis of the strand and is provided with guide and tensioning elements for the tape to be applied. The rate of advance of the strand of material and the rate of rotation of the rotor are here determined by the pitch of the wound tape. Depending on the intended use, several tapes, also tapes of different materials, can be applied in one process step. In the device according to the invention, two tape reels are provided for each type of tape, with the tape always being fed from one tape reel and applied to the strand of material, while the other tape reel rotates along. When the trailing end of the tape reel in operation has left the reel, guide devices now cause the leading end of the tape from the second tape reel to be fed in and to be connected with the trailing tape end so that the taping process can be continued without stoppage. Depending on the type of connection that is employed to connect the trailing tape end with the leading tape end, the rate of advance of the strand of material, on the one hand, and the rate of rotation of the tape feeding device, on the other hand, can here be reduced over a short period of time, so that a reliable and proper connection can be effected between the outgoing trailing tape end and the incoming leading tape end. As soon as this has happened, the device is able to be brought back to its full operating speed. This has the advantage, particularly when taping strands of material, for example cables, which after the taping process are p
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Rollins John F.
Stodola Daniel P.
Stolberger Maschinenfabrik GmbH & Co. KG
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