Sheet feeding or delivering – Delivering – With transfer means between conveyor and receiver
Patent
1986-09-03
1987-11-24
Schacher, Richard A.
Sheet feeding or delivering
Delivering
With transfer means between conveyor and receiver
271 84, 271900, 271189, B65H 2934
Patent
active
047083344
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to laying-up workpieces in the form of pieces of flexible sheet material, that is depositing such a workpiece in a desired location and if desired, laying a second workpiece on top of the first.
Devices for carrying out such an operation have been described, for example in U.K. Patent Specifications Nos. 1,511,210 and 1,570,754. Each of those devices includes a tray on which a workpiece is placed and which is movable to a desired location where the workpiece is to be deposited. Clamps then descend on discrete portions of an edge region of the workpiece and maintain its position whilst the tray is removed.
The present invention provides a device for depositing in a desired location a workpiece constituted by a piece of flexible sheet material, which gives positive control of the workpiece and reduces the chances of the workpiece becoming rucked during its deposition.
SUMMARY OF THE INVENTION
According to the invention, a device for depositing in a desired location a workpiece, comprising a piece of flexible sheet material, the device comprising a tray for supporting the workpiece in a flat condition in a position above a desired location, means for retracting the tray, and restraining means for preventing retraction of the workpiece with the tray, whereby the workpiece can move downwards into the desired location as the tray is retracted, is characterised in that said restraining means comprises a flexible sheet, and means for depositing the flexible sheet over a workpiece on the tray and for retaining it in contact with the workpiece as, during retraction of the tray, the workpiece moves off the tray downwards into the desired location.
Suitably the means for depositing the flexible sheet over a workpiece on the tray is such that the flexible sheet is progressively lowered onto the workpiece on the tray.
In its method aspect, the invention relates to a method of depositing, in a desired location, a workpiece comprising a piece of flexible sheet material, in which a workpiece is supported on a tray, and the tray is retracted whilst retraction of the workpiece is prevented, characterised in that a flexible sheet is deposited over the workpiece resting on the tray in a position above the desired location, and the tray is retracted from under the sheet while the workpiece moves down into the desired location whilst being restrained from following the tray by the said flexible sheet.
Suitably, the flexible sheet is progressively lowered over the workpiece on the tray.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be further described, by way of example with reference to the accompanying drawings, in which:
FIG. 1 is a plan of a device according to the invention,
FIG. 2 is a side elevation of the device of FIG. 1 showing an early stage in the cycle of operation of the device,
FIG. 3 is an end elevation of the device of FIG. 1,
FIGS. 4, 5 and 6 are further side elevations of the device of FIG. 1 showing different stages in operation of the device and
FIG. 7 is a diagram illustrating the mode of operation of a further device according to the invention.
DESCRIPTION OF PREFERRED EMBODIMENT
The device shown in the drawings is able to deposit a workpiece, constituted by a piece of flexible sheet material, in a desired location.
The device comprises a table top 10 supported on stanchions 11 and 12. The stanchions 12 are connected by two horizontal beams 13. Mounted on the table top 10 is a movable tray 14. The tray 14 is supported by wheels 15 and 16. The wheels 15 run on the table top 10 and the wheels 16, with axles lower than the axles of the wheels 15, run in a guide rail 17 so that the tray 14 is guided for reciprocal movement between an extended location for deposition, of a workpiece, shown in FIGS. 1, 2 and 4, and a retracted location for the tray, shown in FIGS. 5 and 6.
Movement of the tray 14 is effected by an air-operated piston-and-cylinder device 18 mounted on brackets 19 beneath the table top 10. The piston rod 21 of the device 18 is connecte
REFERENCES:
patent: 3768807 (1973-10-01), Spengler
patent: 3978785 (1976-09-01), Stapp
patent: 4157823 (1979-06-01), Morton
patent: 4159108 (1979-06-01), Haft
patent: 4406449 (1983-09-01), Buck
Flavell John
Nash Michael A.
Tubb Anthony B.
Courtaulds Clothing Limited
Schacher Richard A,.
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