Sheet feeding or delivering – Feeding – Separators
Patent
1990-05-16
1991-10-29
Olszewski, Robert P.
Sheet feeding or delivering
Feeding
Separators
271 181, 271 33, 11212115, B65H 320
Patent
active
050609246
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for picking up one piece of cloth from a stack of cloth pieces, comprising means for gripping and raising the edge of a piece of cloth to be picked up; and means intended to be inserted under the piece of cloth to be picked up from the side of the raised edge thereof for separating and supporting the piece of cloth.
In clothing industry, it is customary to cut cloths used for the manufacture of garments by means of automatic cutting means which cut several cloths at a time. Such cut pieces of cloth form stacks in which there are several layers of cloth. In practice, it has proved difficult to automatically pick up one piece of cloth from such a stack and various methods and devices have been suggested for the purpose. Such devices include suction-type and sticker-type devices. In suction-type devices a major problem has been that suction applied to the stack of cloth pieces tends to take with it more than one piece of cloth. In sticker-type devices, on the other hand, the performance of the sticking means deteriorates in the long run, so that such devices are unreliable in long-term use especially when transferring pieces of cloth. An example of a more advanced technique is an arrangement in which an air jet is applied to the topmost piece of cloth in a stack from the mid area of the cloth towards its edge, so that the piece of cloth is caused to vibrate, being thus separated from the other cloth pieces. While the edge of the topmost layer "flutters", one arm of an accurately directed gripping jaw can be inserted under the piece of cloth so that the piece of cloth will be positioned between the elongated gripping jaws. Similar or closely related techniques and devices, in which particularly the structure of the means raising the edge of the piece of cloth to be picked up varies, are disclosed e.g. in German Offenlegungsschrifts 3 419 056 and 3 634 699 and U.S. Pat. No. 4 231 563. These techniques, however, are rather sensitive to the change of the kind of cloth and require in any case accurate adjustment for each kind of cloth to be operative.
The object of the present invention is to provide a device for picking up one piece of cloth from a stack of cloth pieces, which device is most reliable and is operative irrespective of the kind of the piece of cloth to be picked up.
This object is achieved by means of a device according to the invention which is characterized in that the separating and supporting means comprising an elongated strip of magnetizable metal, and separating blades positioned on both sides of said strip, the support means being arranged to be inserted under the piece of cloth to be picked up from the side of the raised edge thereof; an elongated magnetic bar positioned opposite to the magnetizable strip for locking the piece of cloth to be picked up between the magnetic bar and the magnetizable strip; and means for displacing the separating blades in opposite sideward directions with respect to the magnetizable strip for wholly separating the piece of cloth to be picked up from the other pieces of cloth in the stack. Further, it is preferable that said means for gripping and raising the edge of the piece of cloth to be picked up comprise a sticker member having a surface of an adhesive material for gripping the piece of cloth to be picked up at the edge region thereof; and means for turning the sticker member for raising the edge of the piece of cloth to be picked up apart from the stack.
In the following the device according to the invention will be described in more detail with reference to the attached drawing, in which the figure shows by way of example one specific embodiment of the device according to the invention.
The figure exemplifies a device for picking up one piece of cloth 1 from a stack 2 of cloth pieces. In the figure, the stack 2 is placed on a vertically adjustable table 10 and it is pressed by holders 9. A sticker member 3 is provided above the stack 2 so as to be pressed with a substantially constant force against the stack 2. The sti
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Airaksinen Pentti
Leppaniemi Reijo
Miettinen Matti
Pohjolainen Jarmo
Varjus Seppo
Cimcorp Oy
Olszewski Robert P.
Reim Steve
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