US3810192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosensitive line printer
Assignee: Nidec Precision Corp
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Filing: 1973-06-21
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Granted: 1974-05-07
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Expires: 1993-06-21
Abstract
Abstract The thermosensitive line printer has a printing head provided with a thermally activated dot-matrix capable of printing a line of letters on a thermosensitive recording sheet upon receipt of a signal from the printer, a head receiving pad and a sheet feeding mechanism provided with a ratchet. In order to operate in succession the printing head for moving the same toward the pad for the printing operation and moving away from the pad for feeding the sheet and the sheet feeding mechanism for feeding the sheet intermittently while the printing head is held apart from the pad, a single electromagnet is operatively connected to a driving lever for reciprocal movement thereof each time the electromagnet is energized which lever is in turn operatively connected to a head supporting lever, a ratchet driving lever and a hook lever so that, upon application of a signal to the electromagnet, the driving lever is actuated to drive the head supporting lever, the ratchet driving lever and the hook lever in timed relation so that the printing operation is effected during the head is urged against the pad and, after the head is moved apart from the pad and temporarily held in that position by the hook lever, and, after the deenergization of the electromagnet, the driving lever is returned to its initial position so that the ratchet is driven by the ratchet driving lever to feed the sheet while the head is held apart from the pad and, at the end of the return movement of the driving lever, the hook lever is released to free the head supporting lever to urge the head against the pad so as to be ready for the next line printing.
Inventors
- 👤 K Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:32
CPC Classifications
B; B41; B41J; B41J25/00; B41J25/304; B41J25/316
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
347 words
A printing apparatus comprising, in combination: a. a pivotally mounted supporting lever; b. a backing pad; c. a printing head mounted on said lever for movement between a printing position adjacent said pad and a retracted position remote from said pad when said lever is pivoted; d. an electromagnet equipped with an armature and moving said armature between a first position and a second position when said electromagnet is energized; e. a pivotally mounted driving lever operatively connected to said armature and to said supporting lever for pivotal movement of said driving lever between two angularly offset positions during movement of said armature between said positions thereof and for transmitting the movement of said armature to said supporting lever and for thereby moving said printing head between said printing position and said retracted position; f. sheet feeding means for advancing a sheet to be printed upon between said pad and said head while said printing head is in the retracted position thereof, said sheet feeding means including 1. a feeding member operatively connected to said driving lever for movement thereby during the pivotal movement of said driving lever, 2. a pawl mounted on said member for movement therewith, 3. a ratchet wheel engaged by said pawl and rotated by said pawl when said member moves in one direction during said movement of said driving lever, and 4. sheet engaging means drivingly connected to said ratchet wheel for advancing said sheet in response to rotation of said ratchet wheel; g. latch means mounted for movement between a locking position in which said latch means engages one of said levers and thereby prevents movement of said printing head from said retracted position, and a releasing position in which said latch means releases said one lever; and h. latch operating means responsive to said movement of said driving lever for moving said latch means between said locking and releasing positions, said latch operating means moving said latch means into said releasing position when said driving lever approaches one of said positions thereof after having moved away from the other position.
Claim 2
Dependent Claim
347 words
A printing apparatus comprising, in combination: a. a pivotally mounted supporting lever; b. a backing pad; c. a printing head mounted on said lever for movement between a printing position adjacent said pad and a retracted position remote from said pad when said lever is pivoted; d. an electromagnet equipped with an armature and moving said armature between a first position and a second position when said electromagnet is energized; e. a pivotally mounted driving lever operatively connected to said armature and to said supporting lever for pivotal movement of said driving lever between two angularly offset positions during movement of said armature between said positions thereof and for transmitting the movement of said armature to said supporting lever and for thereby moving said printing head between said printing position and said retracted position; f. sheet feeding means for advancing a sheet to be printed upon between said pad and said head while said printing head is in the retracted position thereof, said sheet feeding means including 1. a feeding member operatively connected to said driving lever for movement thereby during the pivotal movement of said driving lever, 2. a pawl mounted on said member for movement therewith, 3. a ratchet wheel engaged by said pawl and rotated by said pawl when said member moves in one direction during said movement of said driving lever, and 4. sheet engaging means drivingly connected to said ratchet wheel for advancing said sheet in response to rotation of said ratchet wheel; g. latch means mounted for movement between a locking position in which said latch means engages one of said levers and thereby prevents movement of said printing head from said retracted position, and a releasing position in which said latch means releases said one lever; and h. latch operating means responsive to said movement of said driving lever for moving said latch means between said locking and releasing positions, said latch operating means moving said latch means into said releasing position when said driving lever approaches one of said positions thereof after having moved away from the other position.
Claim 3
Dependent Claim
9 words
a pawl mounted on said member for movement therewith,
Claim 4
Dependent Claim
9 words
a pawl mounted on said member for movement therewith,
Claim 5
Dependent Claim
75 words
An apparatus as set forth in claim 1, futher comprising yieldably resilient means biasing said printing head toward said retracted position, biasing said feeding member to move in said one direction, and biasing said latch means toward said locking position, said electromagnet being operatively connected to said printing head and said feeding member for moving said printing head and said feeding member against the restraint of said yieldably resilient means when said electromagnet is energized.
Claim 6
Dependent Claim
27 words
a ratchet wheel engaged by said pawl and rotated by said pawl when said member moves in one direction during said movement of said driving lever, and
Claim 7
Dependent Claim
27 words
a ratchet wheel engaged by said pawl and rotated by said pawl when said member moves in one direction during said movement of said driving lever, and
Claim 8
Dependent Claim
129 words
An apparatus as set forth in claim 1, further comprising first yieldably resilient means biasing said driving lever to move into one of said angularly offset positions, said electromagnet when energized causing said driving lever to move away from said one angular position against the restraint of said resilient means, second yieldably resilient means biasing said printing head toward said printing position, said driving lever engaging said supporting lever under a sufficient force of said first resilient means to move said printing head into the retracted position against the restraint of said second resilient means when said electromagnet is deenergized, third resilient means biasing said feeding member to move in said one direction, said one lever being said driving lever, said feeding member being mounted on said driving lever.
Claim 9
Dependent Claim
120 words
sheet engaging means drivingly connected to said ratchet wheel for advancing said sheet in response to rotation of said ratchet wheel; g. latch means mounted for movement between a locking position in which said latch means engages one of said levers and thereby prevents movement of said printing head from said retracted position, and a releasing position in which said latch means releases said one lever; and h. latch operating means responsive to said movement of said driving lever for moving said latch means between said locking and releasing positions, said latch operating means moving said latch means into said releasing position when said driving lever approaches one of said positions thereof after having moved away from the other position.
Claim 10
Dependent Claim
120 words
sheet engaging means drivingly connected to said ratchet wheel for advancing said sheet in response to rotation of said ratchet wheel; g. latch means mounted for movement between a locking position in which said latch means engages one of said levers and thereby prevents movement of said printing head from said retracted position, and a releasing position in which said latch means releases said one lever; and h. latch operating means responsive to said movement of said driving lever for moving said latch means between said locking and releasing positions, said latch operating means moving said latch means into said releasing position when said driving lever approaches one of said positions thereof after having moved away from the other position.
Claim 11
Dependent Claim
44 words
An apparatus as set forth in claim 3, wherein said driving lever has two pivotally connected portions, one of said portions transmitting the movement of said armature to said supporting lever, said feeding member being mounted on the other portion of said driving lever.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |