EP0150100A2
Expired / Lapsed
EP
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A ribbon lifting device for a printer
Assignee: Silver Seiko Ltd
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Filing: 1985-01-16
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Granted: —
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Expires: 2005-01-16
Abstract
Abstract O A ribbon lift device for selectively positioning a print ribbon and a correction ribbon to a print position for printing or correction of a character includes a first cam having a cam groove formed therein for lifting the print ribbon to the print position and a second cam having a cam profile for lifting the correction ribbon to the print position. Means are provided for coupling the first and second cams such that forward rotation of the first cam will not rotate the second cam but reverse rotation of the first cam will rotate the second cam in the same direction, and a bidirectional electric motor is coupled to the first cam whereby rotation of the motor will lift the print ribbon or the correction ribbon, depending upon the direction of rotation.
Inventors
- 👤 Hideo C/O Silver Seiko Limited Aoki
- 👤 Kazuaki C/O Silver Seiko Limited Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 20:04
CPC Classifications
B; B41; B41J; B41J35/00; B41J35/22; B41J35/23; B41J35/04; B41J35/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
195 words
A ribbon lifting device for use in a printer comprising a movably mounted assembly (6) adapted to support a print ribbon (11) and a correcting/erasing ribbon (12) at spaced positions and means for selectively moving said assembly to positions in which the print ribbon (11) and the correcting/erasing ribbon (12) are respectively in the operational position, said moving means comprising a cam follower (33) mounted on said movable assembly, a first rotatably mounted cam member (14) having a cam (18) (19) to cooperate with said cam follower, and means (36, 38, 42, 21) to rotate said first cam member, rotation of said first cam member in a first direction from an initial stand-by position causing said movable assembly to move to a position in which said printing ribbon is in the operational position and a second rotatably mounted cam member (15) also having a cam to cooperate with the cam follower, and means (24, 40) to rotate the second cam member, rotation of said second cam member in a predetermined direction from an initial stand-by position causing said movable assembly to move to a position in which said correcting/erasing ribbon is in the operational position.
Claim 2
Dependent Claim
195 words
A ribbon lifting device for use in a printer comprising a movably mounted assembly (6) adapted to support a print ribbon (11) and a correcting/erasing ribbon (12) at spaced positions and means for selectively moving said assembly to positions in which the print ribbon (11) and the correcting/erasing ribbon (12) are respectively in the operational position, said moving means comprising a cam follower (33) mounted on said movable assembly, a first rotatably mounted cam member (14) having a cam (18) (19) to cooperate with said cam follower, and means (36, 38, 42, 21) to rotate said first cam member, rotation of said first cam member in a first direction from an initial stand-by position causing said movable assembly to move to a position in which said printing ribbon is in the operational position and a second rotatably mounted cam member (15) also having a cam to cooperate with the cam follower, and means (24, 40) to rotate the second cam member, rotation of said second cam member in a predetermined direction from an initial stand-by position causing said movable assembly to move to a position in which said correcting/erasing ribbon is in the operational position.
Claim 3
Dependent Claim
61 words
A ribbon lifting device according to claim I wherein the first cam member (14) and the second cam member (15) are mounted on a single shaft, the first cam member having a cam groove (18, 19) formed on a face thereof which is perpendicular to said shaft and said second cam member having a peripheral portion which defines the cam thereof.
Claim 4
Dependent Claim
103 words
A ribbon lifting device according to claim 2 wherein a first portion (18) of the said cam groove of the first cam member (4) which is initially engaged by the cam follower (33) is such that rotation of said first cam member through a predetermined angle in said first direction from the initial stand-by position, followed by rotation of the first cam member in the opposite direction by a similar angle back to the stand-by position will move the said movably mounted assembly (6) so that the print ribbon is moved to the operational position and is then removed from the operational position.
Claim 5
Dependent Claim
76 words
A ribbon lifting device according to claim 3 wherein the said cam groove of the first cam member (14) has a second portion, (19) which merges with said first portion (18), and which extends substantially in an entire circle around the shaft such that successive continuous rotations of the cam member about the shaft will cause the movably mounted assembly (6) to move to a position in which the print ribbon is in the operational position.
Claim 6
Dependent Claim
106 words
A ribbon lifting device according to claim 2 in which the cam follower is in the form of a pin (33) the axis of which is parallel with the axis of said shaft (16), said pin being spring biassed (35) into engagement with the cam groove (18, 19) of the first cam member, the two portions (18, 19) of the groove being of different depth, the arrangement being such that the cam follower will not pass from the first portion (18) of the groove to the second portion of the groove (19) when the cam member is rotated in a direction opposite to said first direction.
Claim 7
Dependent Claim
105 words
A ribbon lifting device according to any one of claims 3 to 5 wherein the second cam member (15) is formed with a lobe which is dimensioned to move the cam follower (33) out of the first portion (18) of the cam groove in the first cam member (14) during a predetermined rotation of the second cam member (15) moving the said movably mounted assembly (6) to a position in which the correcting/erasing ribbon (12) is in the operational position, further rotation of the second cam member subsequently returning the cam follower into the first portion of the cam groove of the first cam member.
Claim 8
Dependent Claim
77 words
A ribbon lifting device according to any one of the preceding claims wherein the first cam member (14) is provided with coupling means (20) thereon, and the second cam member (15) is provided with coupling means (24) thereon, the coupling means being arranged so that on rotation of the first cam member in a direction opposite to said first direction the coupling means engage and the second cam member rotates in synchronism with the first cam member.
Claim 9
Dependent Claim
106 words
A ribbon lifting device according to claim 7 wherein the second cam member (15) is spring (29) biassed towards the first cam member (14), said coupling means comprising projecting portions (20, 24) each defining one perpendicular face and on inclined face, the perpendicular faces of the projecting portions engaging when the first cam member is rotated in said direction opposite to the first direction to cause the second cam to rotate, the sloping faces sliding over one another when the first cam rotates in said first direction, with the second cam member moving against said spring bias, so that the second cam member does not rotate.
Claim 10
Dependent Claim
79 words
A ribbon lifting device according to claim 8 wherein the second cam member (15) is provided with projections (23) on the side thereof remote from the first cam member, said projections (23) cooperating with further corresponding projections (28) provided on an axially movable control member (25) which is spring biassed (29) towards the second cam member, but which is prevented from rotation, the arrangement being such that rotation of the second cam member in the first direction is prevented.
Claim 11
Dependent Claim
40 words
A ribbon lifting device according to claim 9 wherein the first cam member (4) and the second cam member (15) are rotatably mounted on a single shaft (16), and said control member (25) is non-rotatably mounted on the shaft (16).
Claim 12
Dependent Claim
32 words
A ribbon lifting device according to any one of the preceding claims wherein a bi-directional drive motor (36) is provided, the bi-directional drive motor being connected to rotate said first cam member.
Claim 13
Dependent Claim
57 words
A ribbon lifting device according to claim 11 wherein a gear train couples said drive motor (36) to said first member such that a predetermined degree of turn of the drive motor shaft will rotate the first cam member by one turn, means (40, 41) being provided to monitor the degree of turn of the drive motor.
References Cited (Backward Citations)
No citation records indexed.
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