JPS5463745A - Automatic anti-dewing device of drums - Google Patents
Automatic anti-dewing device of drumsInfo
- Publication number
- JPS5463745A JPS5463745A JP13011177A JP13011177A JPS5463745A JP S5463745 A JPS5463745 A JP S5463745A JP 13011177 A JP13011177 A JP 13011177A JP 13011177 A JP13011177 A JP 13011177A JP S5463745 A JPS5463745 A JP S5463745A
- Authority
- JP
- Japan
- Prior art keywords
- heater
- dewing
- power source
- vtr
- switch
- 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.)
- Pending
Links
Landscapes
- Control Of Temperature (AREA)
Abstract
PURPOSE: To cut off power supply to the heater of a VTR drum other than when power source is OFF and dewing is liable to occur and when power source is ON and dewing has occured by limiting the power supply to the heater with two sets of switches and a dew detection circuit.
CONSTITUTION: Where a switch 8 is held connected to a contact 7c and no power source is applied to a VTR, a switch 8 opens to cut off power supply to a heater 9 when the temperature of the heater 9 is raised above the specified temperature by the power supply through the switch 8. Where power source is OFF, the heater 9 is energized only under the conditions where dewing is likely to occur. In the case when the power source of the VTR is turned ON by connecting the switch 7 to the contact 7b, the heater 9 is energized on condition of dewing by the control circuit through the transistors 12, 10 which conduct when dewing of the drum of the VTR is detected with a dew detection circuit 14 and only when these necessary conditions are satisfied, the heater 9 is energized, whereby wasteful power consumption, the occurrence of overheating of the drum, etc. are prevented.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13011177A JPS5463745A (en) | 1977-10-29 | 1977-10-29 | Automatic anti-dewing device of drums |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13011177A JPS5463745A (en) | 1977-10-29 | 1977-10-29 | Automatic anti-dewing device of drums |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5463745A true JPS5463745A (en) | 1979-05-22 |
Family
ID=15026204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13011177A Pending JPS5463745A (en) | 1977-10-29 | 1977-10-29 | Automatic anti-dewing device of drums |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5463745A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58148738U (en) * | 1982-03-29 | 1983-10-06 | 三洋電機株式会社 | VTR condensation removal device |
-
1977
- 1977-10-29 JP JP13011177A patent/JPS5463745A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58148738U (en) * | 1982-03-29 | 1983-10-06 | 三洋電機株式会社 | VTR condensation removal device |
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