GB1227669A - - Google Patents
Info
- Publication number
- GB1227669A GB1227669A GB1227669DA GB1227669A GB 1227669 A GB1227669 A GB 1227669A GB 1227669D A GB1227669D A GB 1227669DA GB 1227669 A GB1227669 A GB 1227669A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- disc
- microseconds
- knob
- microsecond
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
- H04L25/0268—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling with modulation and subsequent demodulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
- H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
1,227,669. Typewriters &c. SIEMENS A.G. 9 June, 1969 [10 June, 1968], No. 29017/69. Heading B6F. [Also in Divisions G4 and H3] A key for a keyboard comprises a ferrite assembly 7 containing a signal coil 9 and a saturating excitation winding 8, a signal being induced in coil 9 when the magnetic circuit is broken by motion of iron disc 10 caused by actuation of knob 2. The motion of the knob is initially taken up by spring 4, then a flange 2a attached to the knob operates a trip 5 to accelerate weight 3 downwardly and displace the disc 10. A light spring 6 normally biases weight 3 away from the disc. In another embodiment, Fig. 2 (not shown), the attractive force between a permanent magnet (19) and a part of the key casing must be overcome before the weight is released to displace the disc. The pulse from each key is shaped, Fig. 3, by a series capacitor C1 and fed to an OR gate G1. The gate output is closed after one microsecond and reopened after seven microseconds to prevent mixed keying during all but the initial microsecond. If a second pulse occurs during the seven microsecond period it is indicated by a lamp SL. To avoid any pulse longer than seven microseconds, the pulse shaping capacitors C1 are discharged through a transistor Tr by diodes D2 within seven microseconds. A capacitor C2 at the output of gate G1 eliminates multiple switching by a single pulse. The excitation windings of the keys in Fig. 3 are series connected to minimize heating effects and loading of the signal coils.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681762397 DE1762397C (en) | 1968-06-10 | Device for key-controlled and ductile generation of telegraphic pulses |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1227669A true GB1227669A (en) | 1971-04-07 |
Family
ID=5697003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1227669D Expired GB1227669A (en) | 1968-06-10 | 1969-06-09 |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE734328A (en) |
FR (1) | FR2010588A1 (en) |
GB (1) | GB1227669A (en) |
LU (1) | LU58801A1 (en) |
NL (1) | NL6908566A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2204081A1 (en) * | 1972-10-20 | 1974-05-17 | Philips Nv |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113639078A (en) * | 2021-08-13 | 2021-11-12 | 河北秦汉电子科技有限公司 | Electromagnetic mechanical device for emergency cut-off self-closing valve |
-
1969
- 1969-06-05 NL NL6908566A patent/NL6908566A/xx unknown
- 1969-06-05 LU LU58801D patent/LU58801A1/xx unknown
- 1969-06-09 GB GB1227669D patent/GB1227669A/en not_active Expired
- 1969-06-10 FR FR6919097A patent/FR2010588A1/fr not_active Withdrawn
- 1969-06-10 BE BE734328D patent/BE734328A/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2204081A1 (en) * | 1972-10-20 | 1974-05-17 | Philips Nv |
Also Published As
Publication number | Publication date |
---|---|
LU58801A1 (en) | 1969-10-28 |
DE1762397A1 (en) | 1970-06-04 |
NL6908566A (en) | 1969-12-12 |
FR2010588A1 (en) | 1970-02-20 |
DE1762397B2 (en) | 1973-02-15 |
BE734328A (en) | 1969-12-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |