Conveyors: power-driven – Conveyor section – Having means to enhance the friction or adherence between...
Reexamination Certificate
1999-04-12
2001-06-05
Valenza, Joseph E. (Department: 3651)
Conveyors: power-driven
Conveyor section
Having means to enhance the friction or adherence between...
C242S614000
Reexamination Certificate
active
06241077
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a transport system for spinning bobbins and bobbin tubes supported on pallets having a foot portion with an element formed of magnetizable material on which permanent magnets act during transport along a transport path bridging a passage wherein the transport path comprises two essentially vertical sections and an essentially horizontal section connected therebetween.
BACKGROUND OF THE INVENTION
In a transport system of the initially cited type (German Patent Publication DE 40 11 797 A1) the disk-shaped or ring-shaped foot portions of the pallets are provided with a ring of magnetizable material, especially with a steel ring. These pallets are customarily transported on horizontally running conveyor belts on which they stand upright by their foot portion. In order to be able to carry out transport in a vertical direction in this transport system a rotating belt aligned in vertical direction is provided and is equipped at set intervals with permanent magnets arranged in pairs. The pallets brought up by a conveyor belt are tipped to the side and subsequently taken by the magnets in such a manner that the spinning bobbins or bobbin tubes are horizontally aligned. The pallets are tipped back at the upper end of the belt and taken by a conveyor belt. In order to transport the pallets back down again at the end of a passage, a second belt is provided which is also equipped with permanent magnets so that the process can be repeated in the reverse order.
It is also known (German Patent Publication DE 36 30 670 C2) that pallets can be transported on a transport path with two essentially vertical sections and one horizontal section by means of a conveyor belt. In this construction, the conveyor belt is provided with an additional belt-shaped frictional member. The pallets are pressed against the frictional member in such a manner by guide bars or arms acting upon their top that a frictional action sufficient for entrainment is obtained. The tops of the foot portions of the pallets thereby slide on the guide bars.
SUMMARY OF THE INVENTION
The present invention thus has the objective of addressing the problem of creating a transport system of the initially cited type which is designed in a simple manner and which largely avoids wear to the pallets.
This problem is solved in that at least one conveyor belt runs along the transport path, the back side of which belt is associated with stationarily arranged permanent magnets distributed over the transport sections, the magnetic forces of which magnets hold the pallets on the conveyor belt.
In such a design according to the invention, the frictional forces between the conveyor belt and the foot portions of the pallets necessary for transport up and down essentially vertical transport sections are applied by the magnetic forces so that the pallets themselves do not slide on any components which would expose them to wear.
An advantageous embodiment of the invention provides that the conveyor belt is guided on the transport path on a slide of non-magnetizable material on whose side facing away from the conveyor belt the permanent magnets are arranged. The slide assures that even the conveyor belt is not loaded too heavily and exposed to elevated wear.
An advantageous embodiment provides that the permanent magnets are magnetized vertically to the slide. As a result thereof the magnetic forces of the permanent magnets can be fully utilized. It is further provided with advantage that the permanent magnets are arranged in pairs spaced in the direction of transport and transversely thereto. The permanent magnets of each pair are oppositely polarized. This forms a magnetic field which runs through the magnetizable elements of the pallets so that they are securely held.
In order to utilize the magnetic forces as well as possible it is further provided that the permanent magnets are connected with each other on the side facing away from the slide by a yoke of magnetizable material. It is advantageously provided that the yoke is designed in the form of a rail attached to a frame and extending in the direction of transport with a plurality of the permanent magnets attached thereto. The yoke can thereby be integrated into the frame necessary for the transport path.
It is advantageously provided that the pallets are surrounded at their foot portion by a ring of magnetizable material and that the conveyor belt has a width which is less than the diameter of the rings. These rings permit a reliable introduction of force into the pallets. This introduction of force is also not disturbed by the conveyor belt, which has a lesser width, so that the magnetic forces pass without hindrance from the permanent magnets to the rings.
The pallets must be accelerated and deflected upward at the receiving position, so that the greatest transport forces are required thereat. For this reason, a zone of stronger magnetic forces is provided in the area of a receiving location at the beginning of the first, essentially vertical section in the direction of the transport path.
Lesser magnetic forces are required at the delivery location, especially in order to be able to carry out a separation of the pallets from the magnets relatively easily. For this reason, a zone of weaker magnetic forces is provided in the area of a delivery location of the second, essentially vertical section of the transport path.
In order to assure that the pallets are delivered in upright form at the delivery position, a separating guide for the pallets is provided between the delivery location of the second section and between a transport element following it at an angle of approximately 90°. This separating guide assures that the pallets are loosened at the end of the second section in a defined manner from the conveyor belt so that they are passed on in upright position to the following transport element, which is also a conveyor belt in most instances.
In order to avoid a backup of pallets in the area of the delivery position the second section of the transport path is provided in front of the delivery position with an individualizing device. This individualizing device, which is known in principle, e.g., from German Patent Publication DE 42 05 499 A1, assures that the pallets do not pass to the delivery position following each other directly.
In order to be able to deflect the pallets between the essentially vertical sections and the horizontal section at as acute an angle as possible, it is provided that the arrangement of permanent magnets is interrupted in the area of deflection positions for the conveyor belts and that deflection rollers for the conveyor belt, which rollers are also equipped with permanent magnets, are provided thereat. The permanent magnets rotate with the deflection rollers and assume the holding of the pallets in this area. The magnetic flux must also not pass through the conveyor belt in this area. Such deflection rollers equipped with permanent magnets can be used with advantage even in other bridge-like transport paths, e.g., in transport paths whose vertical or approximately vertical sections and/or horizontal sections are designed in accordance with German Patent Publication DE 36 30 670.
An advantageous embodiment provides that the permanent magnets are arranged between disks of magnetizable material which project over the circumference of the deflection roller and are flattened off to a polygonal shape. As a result of this polygonal form, acute-angled deflections of the pallets can be realized even though the diameter of the deflection rollers is maintained relatively small.
Further features and advantages of the present invention will be described and understood from the following description of the exemplary embodiments shown in the drawings.
REFERENCES:
patent: 3834519 (1974-09-01), Kitazawa et al.
patent: 3858710 (1975-01-01), Spodig
patent: 3876064 (1975-04-01), Morton
patent: 4212433 (1980-07-01), Matsui et al.
patent: 4236632 (1980-12-01), Spodig
patent: 4315568 (1982-02-01), Mojden
patent: 4697692 (1987-1
Bertrams Josef
Brauer Bernd
Lindemann Ute
Lörsch Bernd
Reuters Hans-Jakob
Kennedy Covington Lodbell & Hickman, LLP
Sharma Rashmi
Valenza Joseph E.
W. Schlafhorst AG & Co.
LandOfFree
Transport system for spinning bobbins and bobbin tubes with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transport system for spinning bobbins and bobbin tubes with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transport system for spinning bobbins and bobbin tubes with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2488797