Sheet feeding or delivering – Delivering – With transfer means between conveyor and receiver
Reexamination Certificate
1999-09-16
2001-06-05
Skaggs, H. Grant (Department: 3651)
Sheet feeding or delivering
Delivering
With transfer means between conveyor and receiver
C271S200000, C271S204000
Reexamination Certificate
active
06241238
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sheet-like material guiding device of an offset printing press.
2. Description of the Related Art
This type of device is disclosed, for example, in Japanese Unexamined Patent Publication No.4-211943. This publication discloses a sheet-fed offset printing press which delivers a printed sheet from a printing unit to a sheet pile device through a delivery passage defined between a chain towing transport mechanism and a transport guide mechanism; wherein the transport guide mechanism is composed of a transport belt (tape) extending in a direction of transport (circumferential direction), and being revolvingly driven in synchronism with the chain towing transport mechanism. The transport belt is connected to a suction wheel (vacuum wheel), and is movable in the transport direction in a manner interlocked with the suction wheel which is movable in the transport direction in accordance with a change in paper size. Elimination of loosening of the transport belt during its motion toward a loose side has been performed by a plumb bob interposed halfway in a looping of the transport belt.
As described above, while the transport belt is moving toward a loose side during the movement of the suction wheel, elimination of loosening of the transport belt has been performed by a plumb bob interposed halfway in a looping of the transport belt. As a result, the tension of the transport belt becomes, as such, a load on the movement of the suction wheel. Thus, a great power is required for the movement of the suction wheel. That is, a power source enough powerful to overcome the weight of the plumb bob is needed, thereby inducing a cost increase. Furthermore, during the movement of the suction wheel, the transport belt may be stretched by the plumb bob, causing a change in the tension. If the plumb bob happens to be inclined, the transport belt may be loosened.
SUMMARY OF THE INVENTION
The present invention has been accomplished in view of the above-described problems. It is an object of the invention to provide a sheet-like material guiding device of an offset printing press in which a guide means can satisfactorily follow during the movement of a sheet speed reducing means to achieve smooth transport, and in which a drive source for the sheet speed reducing means can be made small in capacity.
To attain the above object, the present invention claims a sheet-like material guiding device of an offset printing press, comprising:
a transport means for holding and transporting a sheet-like material;
a sheet piling means for piling the sheet-like material released from the transport means;
a sheet speed reducing means for reducing a speed of the sheet-like material transported by the transport means, the sheet speed reducing means being supported movably in a direction of transport of the sheet-like material; and
a guide means disposed below the transport means for guiding the sheet-like material at nearly the same speed as a speed of transport of the sheet-like material by the transport means, the guide means being movable so as to follow movement of the sheet speed reducing means,
the sheet-like material guiding device including
a pair of rotating parts for supporting the guide means, and
a moving member for supporting the rotating parts movably, with the distance between the rotating parts being unchanged.
The guide means may be a belt enough wide to cover a maximum sheet size.
The guide means may also be a belt, and may be formed by coating urethane onto an upper surface of a cloth comprising warp and weft of polyester, and impregnating a lower surface of the cloth with urethane.
The guide means may also be a belt looped over a plurality of rollers. The pair of rotating parts may be two rollers movably supported by brackets among the plurality of rollers. One of the brackets for the two rollers may be connected to a suction device as the sheet speed reducing means, and the brackets for the two rollers may be connected together via a chain as the moving member movable along a bent chain guide.
The guide means may also be a belt looped between two rollers as the pair of rotating parts movably supported by brackets; one of the brackets for the two rollers may be connected to a suction device as the sheet speed reducing means, and the brackets for the two rollers may be connected together via a rod-shaped part as the moving member.
According to the foregoing constitutions, during the movement of the sheet speed reducing means, the guide means can satisfactorily follow, without imposing a load on a drive source for the sheet speed reducing means. Thus, smooth transport can be realized, and the drive source for the sheet speed reducing means can be made small incapacity. Besides, when the chain movable along the bent chain guide is used, the belt can be caused to effectively follow the suction device, without involving interference with other materials or an increase in space.
The present invention is preferred for use in a sheet-fed offset printing press.
REFERENCES:
patent: 3167012 (1965-01-01), Claybourn
patent: 3730517 (1973-05-01), Norton
patent: 3960374 (1976-06-01), Gaffney
patent: 4469321 (1984-09-01), Geschwindner
patent: 4830355 (1989-05-01), Jeschke
patent: 5259608 (1993-11-01), Pollich
patent: 5263415 (1993-11-01), Pollich
patent: 3638322A1 (1987-11-01), None
patent: 1592001 (1970-05-01), None
patent: 4-211943 (1992-08-01), None
Komori Corporation
Skaggs H. Grant
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