Sheet feeding or delivering – Feeding – By means to convey sheet
Patent
1996-07-08
1998-09-08
Bollinger, David H.
Sheet feeding or delivering
Feeding
By means to convey sheet
271202, 271203, B65H 534
Patent
active
058034501
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a first device intended to bring flat products of low flexural strength, such as sheets or sheet packages of paper or plastic, from a constant inlet velocity v.sub.E to a second constant outlet velocity v.sub.A. The conveyance of packages of printed sheets, which must be slowed from a high inlet velocity to a reduced outlet velocity in order to effect an adaptation to the processing speed of a folding apparatus, can be cited as an example.
DESCRIPTION OF THE PRIOR ART
DE 1 189 919 A1 describes a device consisting of an inlet conveyor belt of a constant velocity, an intermediate conveyor belt with a periodically changing velocity, and an outlet conveyor belt. The transfer of the product to be conveyed from one belt to the next belt respectively takes place at the same velocity of the involved belts. The intermediate conveyance causes an acceleration of the product to a higher velocity. It is driven by a gear making periodic gear changes. Periodic gears are known. The gear with non-circular wheels disclosed in DE 646 002 A can be cited as an example.
In connection with products of a length L, which follow each other at a clock time T, the distance "a" between the shafts of the reversing pulleys of the intermediate conveyor belt is composed of the length L and the deceleration length L.sub.V in the case of a product deceleration and, in the case of a product acceleration, of the length L and the acceleration length L.sub.B.
Relatively short clock times T require comparatively large accelerations and decelerations of the intermediate conveyor belt. Relatively large inertia forces are generated by this, which can result in the breakdown of drive elements. In addition, there is the danger that the products will slide, change their distance and in this way interfere with the clocked operation.
SUMMARY OF THE INVENTION
The object of the present invention is to disclose the relationship between the shaft spacing distance "a" between of the reversing pulleys and the radius of the drive pulley r of the intermediate conveyor belt, to keep the inertia forces as low as possible and to assure a slip-free conveyance of the products.
In accordance with the invention, the shaft spacing distance "a" is considered to be a part of the circumference of a replacement or theoretical pulley with a radius R, parts of the circumference of which are the angle ranges .phi..sub.E for the constant inlet velocity v.sub.E, .phi..sub.V for the deceleration range, .phi..sub.A for the constant outlet velocity v.sub.A, and .phi..sub.B for the acceleration range, and which theoretical pulley makes one revolution during the clock time T, so that the relationship "a"=L+R.phi..sub.V applies in the case of product deceleration, or "a"=L+R.phi..sub.B for the case of product acceleration.
An actual drive pulley of a radius R would be of too large a size and would therefore have too large mass moments of inertia. In order to keep the deceleration and acceleration torque as small as possible at a predetermined periodic movement cycle and shaft spacing distance "a" of the reversing pulleys of the intermediate conveyor belt, the invention provides a considerably smaller radius r of the actual drive pulley of the intermediate conveyor belt than that of the radius R of the theoretical or replacement pulley. This is achieved in that gear wheel stages, which provide gearing up to a faster speed, are disposed between the periodic gear and the drive pulley and as a whole have a total gear level in an amount of i<1. Without a change in the speeds of the intermediate conveyor belt, the radius of the drive pulley then becomes r=iR.
The gear wheels with the ratio i result in that, compared with drive pulleys of the radius R, the mass moment of inertia of drive pulleys of the radius r is less by the factor i.sup.5 and, reduced to the drive shaft of the periodic gear, is less by the factor i.sup.3, if it is assumed that the ratio of width to radius of the pulleys remains constant.
Now, since in conne
REFERENCES:
patent: 3994221 (1976-11-01), Littleton
patent: 4184392 (1980-01-01), Wood
patent: 4601387 (1986-07-01), Kobler
Patent Abstracts of Japan; Pub. No. JP46002953 Dated Jan. 1989; vol. 13, No. 163.
Brokate Heido
Jakob Ralph
Jarchow Friedrich
Liu Ming
Stab Rudolf
Bollinger David H.
Koenig & Bauer--Albert Aktiengesellschaft
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