Sheet conveying device and image forming apparatus including the same
First Claim
1. A sheet conveying device comprising:
- upstream and downstream rotatable conveying means respectively located on an upstream side and a downstream side on a preselected sheet conveyance path;
first and second drive means for respectively causing said upstream and downstream conveying means to rotate, said second drive means driving said downstream conveying means at a variable conveying speed; and
speed adjusting means for causing a conveying speed of said upstream conveying means to reflect the conveying speed of said downstream conveying means that is variable.
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Accused Products
Abstract
A sheet conveying device includes conveying means respectively located at an upstream side and a downstream side on a sheet conveyance path. First drive means rotates the upstream conveying means at a constant speed while second drive means rotates the downstream conveying means at a variable speed. When the second drive means accelerates the rotation of the downstream conveying means, speed adjusting means causes the conveying speed of the upstream conveying means to reflect the acceleration. The sheet conveying device insures smooth, reliable conveyance even when a sheet extends over both of the upstream and downstream conveying means.
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Citations
49 Claims
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1. A sheet conveying device comprising:
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upstream and downstream rotatable conveying means respectively located on an upstream side and a downstream side on a preselected sheet conveyance path;
first and second drive means for respectively causing said upstream and downstream conveying means to rotate, said second drive means driving said downstream conveying means at a variable conveying speed; and
speed adjusting means for causing a conveying speed of said upstream conveying means to reflect the conveying speed of said downstream conveying means that is variable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sheet conveying device for conveying a sheet with upstream and downstream rotatable conveying means respectively located at an upstream side and a downstream side on a preselected sheet conveyance path, said sheet conveying device comprising:
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drive means for causing the downstream conveying means to rotate;
acceleration drive means for accelerating a rotation of the downstream conveying means;
power transmitting means connecting said upstream and downstream conveying means; and
a first one-way clutch intervening between said drive means and the downstream conveying means; and
a second one-way clutch intervening between said acceleration drive means and the downstream conveying means. - View Dependent Claims (11, 12)
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13. A drive control device for controlling first and second drive means for respectively causing upstream and downstream rotatable conveying means, which are respectively located at an upstream side and a downstream side on a preselected sheet conveyance path, to rotate, said drive control device comprising:
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speed adjusting means connecting the upstream and downstream conveying means for causing a conveying speed of said upstream conveying means, which is controlled by the second drive means, to reflect a conveying speed of said downstream conveying means; and
control means for controlling the second drive means such that when the conveying speed of the upstream conveying means and the conveying speed of the downstream conveying means are to be varied, said downstream conveying means rotates at a higher speed than said upstream conveying means. - View Dependent Claims (14, 15)
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16. In a drive control device for controlling drive means for causing upstream and downstream rotatable conveying means, which are respectively located at an upstream side and a downstream side on a preselected sheet conveyance path, to rotate at a preselected speed and acceleration drive means for accelerating a rotation of said upstream conveying means and a rotation of said downstream conveying means, power transmitting means connects said upstream and downstream conveying means,
a first one-way clutch intervenes between said drive means and said downstream conveying means, a second one-way clutch intervenes between said acceleration drive means and said downstream conveying means, and control means controls said acceleration drive means when a conveying speed of said upstream conveying means and a conveying speed of said downstream conveying means are to be varied.
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17. A duplex copy conveying unit comprising:
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a reversing section for reversing a sheet;
a path for receiving the sheet conveyed from said reversing section;
at least upstream and downstream totatable conveying means respectively located at an upstream side and a downstream side on said path for conveying the sheet from said path to an outside of said path;
first and second drive means for respectively causing said upstream and downstream conveying means to rotate, wherein said second drive means drives said downstream conveying means at a variable conveying speed; and
speed adjusting means for causing said upstream conveying means to reflect a conveying speed of said downstream conveying means, which is variable. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A duplex copy conveying unit comprising:
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a reversing section for reversing a sheet;
a path for receiving the sheet conveyed from said reversing section;
at least upstream and downstream rotatable conveying means respectively located at an upstream side and a downstream side on said path for conveying the sheet from said path to an outside of said path;
drive means for causing said downstream conveying means to rotate;
acceleration drive means for acceleration a rotation of said downstream conveying means;
power transmitting means connecting said upstream and downstream conveying means;
a first one-way clutch intervening between said drive means and said downstream conveying means; and
a second one-way clutch intervening between said acceleration drive means and said downstream conveying means. - View Dependent Claims (27, 28)
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29. In an image forming apparatus for forming an image on a sheet that is conveyed by a sheet conveying device arranged in said image forming apparatus, said sheet conveying device comprising:
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upstream and downstream rotatable conveying means respectively located on an upstream side and a downstream side on a preselected path for conveying a sheet;
first and second drive means for respectively causing said upstream and downstream conveying means to rotate, said second drive means driving said downstream conveying means at a variable conveying speed; and
speed adjusting means for causing a conveying speed of said upstream conveying means to reflect the conveying speed of said downstream conveying means that is variable.
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30. In an image forming apparatus for forming an image on a sheet that is conveyed by a sheet conveying device arranged in said image forming apparatus, said sheet conveying device comprising:
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upstream and downstream rotatable conveying means respectively located on an upstream side and a downstream side on a preselected path for conveying a sheet;
drive means for causing the downstream conveying means to rotate;
acceleration drive means for accelerating a rotation of the downstream conveying means;
power transmitting means connecting said upstream and downstream conveying means; and
a first one-way clutch intervening between said drive means and the downstream conveying means; and
a second one-way clutch intervening between said acceleration drive means and the downstream conveying means.
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31. In an image forming apparatus including a drive control device for controlling rotations of at least two sets of conveying means for conveying a sheet on which an image is to be formed, said drive control device comprising:
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speed adjusting means connecting the upstream and downstream conveying means for causing a conveying speed of said upstream conveying means, which is controlled by the second drive means, to reflect a conveying speed of said downstream conveying means; and
control means for controlling the second drive means such that when the conveying speed of the upstream conveying means and the conveying speed of the downstream conveying means are to be varied, said downstream conveying means rotates at a higher speed than said upstream conveying means.
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32. In an image forming apparatus including a drive control device for controlling rotations of at least two sets of conveying means for conveying a sheet on which an image is to be formed, said drive control device comprising:
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power transmitting means connects said upstream and downstream conveying means;
a first one-way clutch intervening between said drive means and said downstream conveying means;
a second one-way clutch intervening between said acceleration drive means and said downstream conveying means; and
control means for controlling said acceleration drive means when a conveying speed of said upstream conveying means and a conveying speed of said downstream conveying means are to be varied.
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33. In an image forming apparatus for reversing and conveying a sheet carrying an image thereon by using a duplex copy conveying unit, said duplex conveying unit comprising:
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a reversing section for reversing a sheet;
a path for receiving the sheet conveyed from said reversing section;
at least upstream and downstream conveying means respectively located at an upstream side and a downstream side on said path for conveying the sheet from said path to an outside of said path;
first and second drive means for respectively causing said upstream and downstream conveying means to rotate, wherein said second drive means drives said downstream conveying means at a variable conveying speed; and
speed adjusting means for causing said upstream conveying means to reflect a conveying speed of said downstream conveying means, which is variable.
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34. In an image forming apparatus for reversing and conveying a sheet carrying an image thereon by using a duplex copy conveying unit, said duplex conveying unit comprising:
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a reversing section for reversing a sheet;
a path for receiving the sheet conveyed from said reversing section;
at least upstream and downstream conveying means respectively located at an upstream side and a downstream side on said path for conveying the sheet from said path to an outside of said path;
drive means for causing said downstream conveying means to rotate;
acceleration drive means for acceleration a rotation of said downstream conveying means;
power transmitting means connecting said upstream and downstream conveying means;
a first one-way clutch intervening between said drive means and said downstream conveying means; and
a second one-way clutch intervening between said acceleration drive means and said downstream conveying means.
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35. In a sheet conveying method for conveying a sheet by causing first and second drive means to respectively drive upstream and downstream rotatable conveying means, which are respectively located at an upstream side and a downstream side on a preselected sheet conveyance path, when said sheet extends over both of said upstream and downstream conveying means, said first drive means and said upstream conveying means are caused slip on each other while said second drive means causes said downstream conveying means at a higher speed than said upstream conveying means, and
an increased rotation speed of said downstream conveying means is transmitted to said upstream conveying means to thereby equalize a rotation speed of said upstream conveying means and a rotation speed of said downstream conveying means, whereby a conveyance of the sheet is accelerated.
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36. In a drive control method for controlling a conveying speed of upstream conveying means and a conveying speed of downstream rotatable conveying means, which are respectively located at an upstream side and a downstream side on a preselected sheet conveyance path, first and second drive means respectively causing said upstream and downstream conveying means to rotate, when a sheet extends over both of said upstream and downstream conveying means, said first drive means and said upstream conveying means are caused to slip on each other while said second drive means rotates said downstream conveying means at a higher speed than said upstream conveying means,
an increased rotation speed of said downstream conveying means is transmitted to said upstream conveying means to thereby increase a conveying speed of said upstream conveying means.
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37. A sheet conveying device for conveying a sheet, comprising:
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upstream and downstream rotatable conveying means respectively located at an upstream side and a downstream side on a preselected sheet conveyance path;
first and second drive means for respectively causing said upstream and downstream conveying means to rotate;
power transmitting means connecting said upstream and downstream conveying means;
a first one-way clutch intervening between said upstream conveying means and said first drive means for transmitting only a rotation of said first drive means that conveys a sheet in an intended direction of sheet conveyance to said upstream conveying means;
a second one-way clutch disposed in said power transmitting means for transmitting a rotation of said second drive means that accelerates a conveyance of the sheet in the intended direction of sheet conveyance to said upstream conveying means; and
delaying means for delaying rotation transmission from said second drive means to said upstream conveying means. - View Dependent Claims (38, 39, 40, 41)
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42. A duplex copy conveying unit comprising:
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a reversing section for revering a sheet;
a path for receiving the sheet conveyed from said reversing section;
at least upstream and downstream conveying means respectively located at an upstream side and a downstream side on said path for conveying the sheet from said path to an outside of said path;
power transmitting means connecting said upstream and downstream conveying means;
a first one-way clutch intervening between said upstream conveying means and said first drive means for transmitting only a rotation of said first drive means that conveys a sheet in an intended direction of sheet conveyance to said upstream conveying means;
a second one-way clutch disposed in said power transmitting means for transmitting a rotation of said second drive means that accelerates a conveyance of the sheet in the intended direction of sheet conveyance to said upstream conveying means; and
delaying means for delaying rotation transmission from said second drive means to said upstream conveying means. - View Dependent Claims (43, 44, 45, 46)
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47. In an image forming apparatus for forming an image on a sheet that is conveyed by a sheet conveying device, said sheet conveying device comprising:
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upstream and downstream rotatable conveying means respectively located at an upstream side and a downstream side on a preselected sheet conveyance path;
first and second drive means for respectively causing said upstream and downstream conveying means to rotate;
power transmitting means connecting said upstream and downstream conveying means;
a first one-way clutch intervening between said upstream conveying means and said first drive means for transmitting only a rotation of said first drive means that conveys a sheet in an intended direction of sheet conveyance to said upstream conveying means;
a second one-way clutch disposed in said power transmitting means for transmitting a rotation of said second drive means that accelerates a conveyance of the sheet in the intended direction of sheet conveyance to said upstream conveying means; and
delaying means for delaying rotation transmission from said second drive means to said upstream conveying means.
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48. In an image forming apparatus for reversing and conveying a sheet carrying an image thereon by using a duplex copy conveying unit, said duplex copy conveying unit comprising:
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a reversing section for revering a sheet;
a path for receiving the sheet conveyed from said reversing section;
at least upstream and downstream conveying means respectively located at an upstream side and a downstream side on said path for conveying the sheet from said path to an outside of said path;
power transmitting means connecting said upstream and downstream conveying means;
a first one-way clutch intervening between said upstream conveying means and said first drive means for transmitting only a rotation of said first drive means that conveys a sheet in an intended direction of sheet conveyance to said upstream conveying means;
a second one-way clutch disposed in said power transmitting means for transmitting a rotation of said second drive means that accelerates a conveyance of the sheet in the intended direction of sheet conveyance to said upstream conveying means; and
delaying means for delaying rotation transmission from said second drive means to said upstream conveying means.
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49. In a sheet conveying method for conveying a sheet by causing first and second drive means to respectively drive upstream and downstream rotatable conveying means, which are respectively located at an upstream side and a downstream side on a preselected sheet conveyance path, when said sheet extends over both of said upstream and downstream conveying means, said first drive means and said upstream conveying means are caused slip on each other while said second drive means causes said downstream conveying means at a higher speed than said upstream conveying means, and
an increased rotation speed of said downstream conveying means is transmitted to said upstream conveying means after being delayed to thereby equalize a rotation speed of said upstream conveying means and a rotation speed of said downstream conveying means, whereby a conveyance of the sheet is accelerated.
Specification