Typewriting machines – Having power-driven operator for plural functions
Reexamination Certificate
2000-01-11
2002-04-09
Hilten, John S. (Department: 2854)
Typewriting machines
Having power-driven operator for plural functions
C400S186000, C400S187000, C400S371000
Reexamination Certificate
active
06367994
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a power transmission switching device for selectively switching two drive transmission systems and transmitting driving force from one driving source to the selected drive transmission system, a locking device for securely locking the engagement of gears in the selected drive transmission system in the power transmission switching device and a recording apparatus provided with the power transmission switching device for individually driving the two drive transmission systems by one driving source.
2. Related Art
If the driving force of one driving source such as a motor is individually transmitted to two driven systems and utilized, a power transmission switching device may be provided halfway to the driven systems to switch the transmission of the driving force.
For a conventional type example of such a power transmission switching device, as disclosed in Japanese published unexamined patent application Hei.9-169121 for example, there is structure that a driving gear having a long dimension in an axial direction is provided on the side of a driving source, a first driven gear and a second driven gear respectively connected to different drive units are provided on the side of driven transmission mechanisms and further, a slide gear which is always engaged with the driving gear and can be slid in the axial direction of the driving gear is provided between the driving gear and the first driven gear or the second driven gear. In such structure, when the slide gear is located on the one side in the axial direction of the driving gear, driving force is transmitted to the first driven gear, when the slide gear is slid to the other side in the axial direction of the driving gear, driving force is transmitted to the second driven gear and the transmission of a drive to the first driven gear is disconnected.
Also, for another conventional type example of the power transmission switching device, there is structure that a gear train for a paper supply roller of a printer and a gear train for a paper feeding roller are switched by a switching device as disclosed in Japanese published unexamined patent applications Hei. 10-129057 and Hei. 10-129895. The above switching device operates a switching lever utilizing the movement of a carriage to a home position to execute the connection and the release of the connection of gear trains.
However, in a mechanism provided with the former slide gear, there is a problem that as a fixed or longer dimension in a direction in which the slide gear is slid is required, a compact power transmission switching device cannot be realized and the whole switching device is large-sized.
Also, in the latter switching device, as the movement of a carriage to a home position operates a switching lever, throughput is extended by time when the carriage is moved. There is a problem that as structure that the carriage presses the switching lever to slide a gear is adopted, the structure is complicated and the switching device is thickened in a direction in which the gear is slid.
To solve these problems, the adoption of a planet gear which can be selectively engaged with each drive transmission gear of two drive transmission systems is conceivable. However, in this case, when the planet gear is normally and reversely rotated in a state that it is engaged with either of the two drive transmission gears, gears are sometimes separated and a situation that all teeth are not engaged occurs unless a rocking lever is tightly fixed in a state that the planet gear is engaged with the drive transmission gear.
A first object of the present invention is to provide a power transmission switching device provided with relatively simple and compact structure including a mechanism for selectively switching two power transmission systems by one driving source.
A second object of the present invention is to provide a rocking lever locking device for tightly locking the rocking lever in a state that a planet gear is engaged with either of two drive transmission gears in a power transmission switching device.
A third object of the present invention is to provide a miniaturized recording apparatus including a power transmission switching device the structure of which is simple and compact for individually driving two drive transmission systems by one driving source.
SUMMARY OF THE INVENTION
To achieve the above objects, according to a first aspect of the present invention, a power transmission switching device provided with a mechanism for selectively switching two drive transmission systems connected to one driving source and comprising a first drive transmission gear of a first drive transmission system, a first drive transmission gear of a second drive transmission system, a rocking lever which can be rocked between the first drive transmission gear of the first drive transmission system and the first drive transmission gear of the second drive transmission system, a planet gear attached to the rocking lever, located between the above both drive transmission gears and selectively engaged with the above both drive transmission gears by the rock of the rocking lever for transmitting driving force from the driving source and locking means for locking the rocking lever in a state that the planet gear is engaged with either of the two drive transmission gears wherein the first drive transmission gear of the first drive transmission system and the first drive transmission gear of the second drive transmission system are located on both sides of the drive shaft of the driving source and the first and second drive transmission systems are connected to a drive unit normally and reversely rotated is provided.
According to the above configuration, driving force from the driving source can be selectively transmitted to the first and second drive transmission systems by rolling the planet gear between the first drive transmission gear of the first drive transmission system and the first drive transmission gear of the second drive transmission system. If the planet gear is rotated clockwise and counterclockwise, that is, if it is normally and reversely rotated, the planet gear is also never separated from the first drive transmission gear of each drive transmission system by locking the rocking lever by the above locking means. Therefore, gears are prevented from being separated and a situation that all teeth are not engaged is prevented from occurring.
Also, according to another aspect of the present invention, another power transmission switching device provided with a mechanism for selectively switching two drive transmission systems connected to one driving source and comprising a first drive transmission gear of a first drive transmission system, a first drive transmission gear of a second drive transmission system, a rocking lever which can be rocked between the first drive transmission gear of the first drive transmission system and the first drive transmission gear of the second drive transmission system, a planet gear attached to the rocking lever, located between the above both drive transmission gears, rolled on a locus between the above both drive transmission gears and selectively engaged with the both drive transmission gears by the rock of the rocking lever for transmitting driving force from the driving source and rocking lever holding means for advancing or backing the rocking lever on the above locus to regulate the above roll of the planet gear in a state that the planet gear is engaged with either of the two drive transmission gears wherein the first drive transmission gear of the first drive transmission system and the first drive transmission gear of the second drive transmission system are located on both sides of the drive shaft of the driving source and the first and second drive transmission systems are connected to a drive unit normally and reversely rotated is provided.
According to the above configuration, the similar action and effect are also acquired. The rocking lever locking means disclose
Komuro Kiyoto
Oshima Keiich
Tsuji Etsuo
Yokoyama Koichiro
Chau Minh H.
Hilten John S.
Seiko Epson Corporation
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