Presses – Binding – With automatic or material-triggered control
Reexamination Certificate
1999-11-05
2001-11-20
Gerrity, Stephen F. (Department: 3721)
Presses
Binding
With automatic or material-triggered control
C056S343000, C192S028000
Reexamination Certificate
active
06318250
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to agricultural machinery and, more particularly, to a device for actuating the clutch of a twine wrap device for balers and especially for big square balers.
BACKGROUND OF THE INVENTION
Applicant is aware of the following patents and publications, the disclosures of which are incorporated by reference herein:
U.S. Pat. No. 4,083,441
U.S. Pat. No. 4,522,120
U.S. Pat. No. 4,569,282
U.S. Pat. No. 4,838,015
U.S. Pat. No. 5,783,816
EP 0,573,342
A mechanical twine wrapping device is known from U.S. Pat. No. 4,083,441 (DE 27 38 500). In this design, the bale length is determined by a rotatable star wheel. The rotary movement of the star wheel is transmitted by a toothed segment and a connecting lever to a pivotably mounted stop in the clutch region. As soon as the pre-selected bale length is reached, the actuation of the clutch is controlled by the stop, and the process of twine wrapping the bale is triggered. Sufficient reliability of operation is achieved in balers of small and medium capacities with this design. However, as a result of higher pressing capacities and working speeds, such a design does not provide reliable and trouble-free operation under all the conditions, particularly in the conditions which occur in big square balers.
Electrical actuating devices for the clutch of the twine wrap device, such as those on big square balers, have also been developed. For example, from EP 0 573 342, a baler is known on which the twine wrap device is controlled by a star wheel, which determines the bale length, in conjunction with an electrical sensor. When the bale reaches a specified length, the sensor sends a signal to a control device which emits a control signal to the device for triggering the twine wrapping process. The triggering device is comprised of a lifting magnet, which is actuated by the control signal, and a clutch. When the lifting magnet is actuated, the clutch is switched by the lifting motion of the lifting magnet's ram. However, voltage fluctuations within the electrical wiring of the baler can prevent the lifting magnet from exerting a sufficient force to trigger the clutch, and may lead to malfunctions during the twine wrapping process.
SUMMARY OF THE INVENTION
The present invention provides a reliable actuating device for the clutch of a twine wrap device, for example, that of a big square baler as described herein, or other machines using wrapped twine fasteners. In accordance with one aspect of the present invention, there is provided a device for actuating the clutch of a twine wrap device using a pawl attached to the clutch, a shift lever is pivotable into the orbit of the pawl, a control device activates the shift lever, and an electric motor cooperates with the control device for the shift lever. The electric motor may be connected via an electric circuit with a device for determining the bale length in a baler. The electromotive control of the clutch according to the present invention requires a relatively low power level and may be independent of the particular vehicle voltage, as a result, the reliability of the clutch triggering process at the required point in time is improved.
It is an object of this invention to provide a twine wrapping device for balers having an improved clutch mechanism.
It is an object of this invention to provide a twine wrapping device for balers having an electromotive controlled clutch.
It is an object of this invention to provide a clutch mechanism for a twine wrapping device having a control mechanism actuated by an electric motor.
It is a further object of this invention to provide a twine wrapping device for big square balers having a clutch mechanism with an improved clutch actuating device.
These and other objects, aspects, features and advantages of the present invention will become apparent from the following detailed description when taken in conjunction with the referenced drawings. The drawings illustrate the best presently known mode of carrying out the invention and use similar reference characters to indicate the same parts throughout the views.
REFERENCES:
patent: 2560143 (1951-07-01), Vietti
patent: 2633794 (1953-04-01), Rothrock
patent: 2636582 (1953-04-01), Harrington et al.
patent: 2713303 (1955-07-01), Hill
patent: 2746584 (1956-05-01), Skromme
patent: 4083441 (1978-04-01), Young
patent: 4095520 (1978-06-01), Burford
patent: 4522120 (1985-06-01), Olfert
patent: 4569282 (1986-02-01), Galant
patent: 4838015 (1989-06-01), Mouret et al.
patent: 5783816 (1998-07-01), McPherson
patent: 5855166 (1999-01-01), McPherson
patent: PS 5 94 733 (1934-03-01), None
patent: PS 7 67 505 (1952-11-01), None
patent: 27 38 500 (1978-03-01), None
patent: 0 573 342 B1 (1997-07-01), None
patent: 3-139208-A (1991-06-01), None
patent: 3-155705-A (1991-07-01), None
Arnould Cyrille
Mesmer Denis
Nonhoff Ansgar
Campbell, II Dutro E.
Gerrity Stephen F.
Husch & Eppenberger LLC
Muir Robert E.
Usines Claas France
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