Conveyors: power-driven – Conveyor section – Unit load conveying surface means moved about an endless or...
Patent
1997-10-08
2000-04-25
Ellis, Christopher P.
Conveyors: power-driven
Conveyor section
Unit load conveying surface means moved about an endless or...
198812, 1984643, 198444, B65G 1712
Patent
active
060533048
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a storage unit for the temporary storage of rolls or logs of rolled up band-shaped material, arranged between a first section and a second section of a production or conversion line.
More particularly, the invention relates to an intermediate storage unit of the type comprising: input means for the distribution in the storage unit of rolls arriving from said first section, output means for the controlled discharge of rolls from the storage unit towards said second section, an indefinite flexible member bearing a plurality of seats for said rolls, said seats being subdivided into two groups, of full seats and of empty seats respectively, and two motor units, for the advance of the seats of the first group towards the output means and of the seats of the second group towards the input means.
STATE OF THE ART
Temporary accumulation storage units of this type are described for example in the U.S. Pat. Nos. 4,142,626 and 4,168,776. These are normally used in paper conversion lines, in which, from a reel of paper of large diameter, small rolls of toilet paper, all-purpose towels and similar products are formed, which are packed in individual or multiple packagings. In these conversion lines, the initial reel of paper is unrolled and rolled up again, in a so-called re-reeling machine, to form logs or rolls of a height equal to the height of the reel and of a diameter equal to the diameter of the finished product. The logs thus obtained have to be closed by means of gluing of the free end in a gluing machine arranged downstream of the re-reeling machine. Successively, each log or roll is sent to a cropper to be cut perpendicularly to its own axis to obtain small rolls of desired height.
Arranged between the gluing machine (or a number of gluing machines in parallel) and the cropper (or a number of croppers in parallel) is a storage unit for the temporary accumulation of the glued rolls which makes it possible to free the production rates of the re-reeling machine and of the gluing machine (or of the gluing machines) from that of the cropper or of the croppers. The storage unit has a pair of parallel chains forming an indefinite flexible member bearing a plurality of oscillating seats or troughs which receive and discharge the rolls.
The flexible member of the accumulation storage unit, constituted by a pair of parallel chains lying in two vertical planes on the two sides of the storage unit, are typically guided between series of guide wheels, some of which have a fixed axle and others have a movable axle, to allow a variation in the number of full and empty seats respectively. The number of full seats varies in relation to the number of empty seats according to the frequency of arrival of rolls from the production section upstream, and to the frequency of discharge of the rolls towards the section downstream. In traditional devices, the movement of the flexible member is of intermittent type, both in the input zone and in the output zone. The actuation of the input and output motor units is brought about respectively by the arrival of a roll from the gluing machine or by the request for one or a number of rolls simultaneously by the cropper. This intermittent movement causes a series of disadvantages, due mainly to the great dynamic stresses caused by the starts and by the stops of the flexible member and of the full and empty seats.
The control of the advance of the flexible member is particularly important. In fact, it is necessary to ensure that all the seats or troughs of the storage unit, on passage from the charging station, are filled, without leaving empty seats intercalated with full seats. The presence of an empty seat between two full seats may bring about the absence of a roll in one of the channels of the cropper and therefore an unbalance in the section of the line downstream, with consequent serious disadvantages in the packaging machines positioned downstream of the cropper. Correct functioning of the accumulation storage unit is therefore essential to
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Drawing of Paper Machine Converting Company (PCMC) Machine R 00697 With Order Acknowledgement Form Dated 02/28/1979 and 07/16/1979.
Dillon, Jr. Joe
Ellis Christopher P.
Fabio Perini S.p.A.
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