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US4729557A Expired / Lapsed US ⏱️ 0.0 years remaining

Sheet feed device

Assignee: Canon Inc
•
Filing: 1987-07-02
•
Granted: 1988-03-08
•
Expires: 2007-07-02
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Abstract

Abstract A sheet feed device applicable to a recorder such as an ink jet printer or a thermal printer has feed rollers mounted on the same shaft in a spaced relationship and platen blocks mounted in spaces between the feed rollers. A sheet fed along the feed rollers is conveyed to the platen blocks by a feed force of the feed rollers.

Inventors

  • 👤 Takehiko Kiyohara

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 11:33
CPC Classifications
B; B41; B41J; B41J11/00; B41J11/02; B41J11/04; B41J15/00; B41J15/04; B41J15/06; Y; Y10; Y10S; Y10S271/00; Y10S271/90

Claims Analysis

Total Claims: 27
Claim 1
Independent Claim 138 words
A sheet feed device for a recording apparatus, comprising: a plurality of rotatable members arranged in spaced relation along a width of a sheet feed path for feeding a sheet in a feeding direction; and a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein each said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of said first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces.
Claim 2
Dependent Claim 138 words
A sheet feed device for a recording apparatus, comprising: a plurality of rotatable members arranged in spaced relation along a width of a sheet feed path for feeding a sheet in a feeding direction; and a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein each said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of said first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces.
Claim 3
Dependent Claim 21 words
A device according to claim 1, wherein said guide members are displaceable relative to a support member supporting said guide members.
Claim 4
Dependent Claim 16 words
A device according to claim 1, wherein a support member supporting said guide members is displaceable.
Claim 5
Dependent Claim 45 words
A device according to claim 1, wherein a portion of each said guide member upstream of said first guide surface thereof with respect to the sheet feeding direction is disposed inwardly of the peripheries of said rotatable members with respect to the sheet feed path.
Claim 6
Dependent Claim 14 words
A device according to claim 1, wherein each said second guide surface is flat.
Claim 7
Dependent Claim 15 words
A device according to claim 1, wherein each said second guide surface is slightly curved.
Claim 8
Dependent Claim 168 words
A sheet feed device for a recording apparatus, comprising: a plurality of rotatable members arranged in spaced relation along a width of a sheet feed path for feeding a sheet in a feeding direction; a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein each said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces; and resilient means opposed to the peripheries of said rotatable members and said first guide surfaces for urging the sheet against the peripheries of said rotating members and said first guide surfaces.
Claim 9
Dependent Claim 168 words
A sheet feed device for a recording apparatus, comprising: a plurality of rotatable members arranged in spaced relation along a width of a sheet feed path for feeding a sheet in a feeding direction; a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein each said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces; and resilient means opposed to the peripheries of said rotatable members and said first guide surfaces for urging the sheet against the peripheries of said rotating members and said first guide surfaces.
Claim 10
Dependent Claim 21 words
A device according to claim 7, wherein said guide members are displaceable relative to a support member supporting said guide members.
Claim 11
Dependent Claim 16 words
A device according to claim 7, wherein a support member supporting said guide members is displaceable.
Claim 12
Dependent Claim 18 words
A device according to claim 7, wherein said resilient means extends the width of the sheet feed path.
Claim 13
Dependent Claim 30 words
A device according to claim 7, wherein said resilient means is arranged at two points, upstream and downstream of said first guide surfaces with respect to the sheet feeding direction.
Claim 14
Dependent Claim 45 words
A device according to claim 7, wherein a portion of each said guide member upstream of said first guide surface thereof with respect to the sheet feeding direction is disposed inwardly of the peripheries of said rotatable members with respect to the sheet feed path.
Claim 15
Dependent Claim 14 words
A device according to claim 7, wherein each said second guide surface is flat.
Claim 16
Dependent Claim 15 words
A device according to claim 7, wherein each said second guide surface is slightly curved.
Claim 17
Dependent Claim 168 words
A sheet feed device for a recording apparatus, comprising: a plurality of rotatable members arranged in a spaced relation along a width of a sheet feed path for feeding a sheet in a feeding direction; a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein each said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of said rotatable members at the position of first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces; and support means displaceably supporting said guide members to enable adjustment of the position of said guide members with respect to said rotatable members.
Claim 18
Dependent Claim 168 words
A sheet feed device for a recording apparatus, comprising: a plurality of rotatable members arranged in a spaced relation along a width of a sheet feed path for feeding a sheet in a feeding direction; a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein each said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of said rotatable members at the position of first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces; and support means displaceably supporting said guide members to enable adjustment of the position of said guide members with respect to said rotatable members.
Claim 19
Dependent Claim 14 words
A device according to claim 15, wherein each said second guide surface is flat.
Claim 20
Dependent Claim 15 words
A device according to claim 15, wherein each said second guide surface is slightly curved.
Claim 21
Dependent Claim 17 words
A device according to claim 15, wherein said guide members are removably mounted on said support means.
Claim 22
Dependent Claim 17 words
A device according to claim 15, wherein said guide members are integrally fixed with said support means.
Claim 23
Dependent Claim 171 words
A recording apparatus for recording an image on a sheet fed by a sheet feed device, comprising: a plurality of rotatable members arranged in a spaced relation along the width of a sheet feed path for feeding a sheet in a feeding direction; a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces; and recording means for recording an image corresponding to information on the sheet, said recording means being disposed in a facing relation with said second guide surfaces.
Claim 24
Dependent Claim 171 words
A recording apparatus for recording an image on a sheet fed by a sheet feed device, comprising: a plurality of rotatable members arranged in a spaced relation along the width of a sheet feed path for feeding a sheet in a feeding direction; a plurality of guide members separated and disposed between said rotatable members, each said guide member having first and second guide surfaces for guiding the sheet, wherein said first guide surface is disposed to substantially coincide with a predetermined extent of the peripheries of said rotatable members with respect to the sheet feed path and each said second guide surface extends continuously from the corresponding said first guide surface downstream of first guide surface with respect to the sheet feeding direction to provide a recording area where the recording apparatus can record on the sheet supported by said second guide surfaces; and recording means for recording an image corresponding to information on the sheet, said recording means being disposed in a facing relation with said second guide surfaces.
Claim 25
Dependent Claim 14 words
An apparatus according to claim 20, wherein each said second guide surface is flat.
Claim 26
Dependent Claim 15 words
An apparatus according to claim 20, wherein each said second guide surface is slightly curved.
Claim 27
Dependent Claim 18 words
An apparatus according to claim 20, wherein said recording means comprises a recording head for ejecting liquid ink.

References Cited (Backward Citations)

FR958832A Cited
US1569052A Cited
US1851049A Cited
US1988189A Cited
US4039065A Cited
US3955889A Cited
US4197023A Cited
US4421428A Cited
US4237466A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-03-08 1991-09-07 1992-03-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-03-08 1995-09-07 1996-03-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-03-08 1999-09-07 2000-03-08 $7700.00 Window Closed / Lapsed

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