US4010834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing device comprising a distance member
Assignee: Digital Equipment Corp
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Filing: 1976-02-23
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Granted: 1977-03-08
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Expires: 1996-02-23
Abstract
Abstract A printing device comprising a printing head, in which the ends of printing members facing a record carrier can be adjusted to a predetermined distance from the record carrier. The distance member comprises a curved leaf spring which is connected to a contact member which contacts the record carrier. The distance between the record carrier and the printing members (the printing distance) is adjusted by changing the curvature of the leaf spring. The printing distance can thus be maintained at an as constant as possible value also in the case of thickness variations of the record carriers or wear of the printing members.
Inventors
- 👤 Ebbe Linder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:11
CPC Classifications
B; B41; B41J; B41J25/00; B41J25/304; B41J25/308; B41J25/3082
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
In a printing device comprising a printing head which is displaceable along a record carrier at a printing distance which is determined by an adjustable distance member, the printing head being displaceable in the direction to or from the record carrier by adjustment of said distance member for adjustment of the printing distance between the printing head and the record carrier, the improvement wherein the distance member comprises a contact member which contacts the record carrier during printing, and a leaf spring which is coupled to said contact member and which comprises an adjustable curvature in its longitudinal direction, the leaf spring being guided along and contacting, near both ends of the curvature, surface areas of the printing head, the connecting line between the two surface contact areas on the printing head being substantially transverse of the plane of the record carrier at the printing area.
Claim 2
Dependent Claim
146 words
In a printing device comprising a printing head which is displaceable along a record carrier at a printing distance which is determined by an adjustable distance member, the printing head being displaceable in the direction to or from the record carrier by adjustment of said distance member for adjustment of the printing distance between the printing head and the record carrier, the improvement wherein the distance member comprises a contact member which contacts the record carrier during printing, and a leaf spring which is coupled to said contact member and which comprises an adjustable curvature in its longitudinal direction, the leaf spring being guided along and contacting, near both ends of the curvature, surface areas of the printing head, the connecting line between the two surface contact areas on the printing head being substantially transverse of the plane of the record carrier at the printing area.
Claim 3
Dependent Claim
84 words
A printing device as claimed in claim 1, wherein the leaf spring comprises a flat portion which adjoins the curved portion and which is parallel to the face of the printing head which is contacted by the leaf spring, the leaf spring being secured to the printing head near the center of the curved portion and the flat portion by means of screw-bolts which project through openings in the leaf spring, at least the opening situated in the flat portion having an elongated shaped.
Claim 4
Dependent Claim
33 words
A printing device as claimed in claim 1 wherein the contact member consists of a rotatable roller which is secured to the end portion of the leaf spring which faces the record carrier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |