JPH04121032U - Rotating drum dew removal device - Google Patents

Abstract

(57) [Summary] [Purpose] To remove condensation from a rotating drum in a short time in a rotating drum dew removal device. [Structure] A dew sensor 46 is provided near the rotating drum 20, a moisture absorbing roller 48 is attached to one end of a rotating lever 52, and a dew wiping member 50 is attached to the other end. When the dew sensor 46 detects dew condensation, the control means 56 rotates the rotary lever 52 via the drive means 54, so that the moisture absorbing roller 48 comes into contact with the rotating drum 20 to absorb and remove dew. On the other hand, the dew wiping member 50 wipes off condensation on the dew sensor 46.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a rotating drum installed in recording/playback devices such as video tape recorders. This invention relates to improvements in dew removal equipment.

0002

[Conventional technology]

In general, video tape recorders (VTRs) and digital audio tape recorders In recording and reproducing devices such as DAT, a rotating drum is attached to a running magnetic tape. are brought into contact with each other, thereby recording and reproducing information magnetically. To explain this based on FIG. 6, taking a VTR as an example, a video cassette A supply reel 4 and a take-up reel 6 are provided within the tray 2. Above supply lee The magnetic tape 8 supplied from the cable 4 is attached to a fixed post 10, a supply guide 12, and a tape. through the tension post 14, the entrance side guide roller 16, and the entrance side inclined post 18. After traveling in sequence, it comes into contact with the rotating drum 20 at an angle, and the pair of video heads 22 , 22 perform recording and reproduction. Then, the magnetic field that has left the rotating drum 20 is The air tape 8 includes an exit-side inclined post 24, an exit-side guide roller 26, and a pinch roller. Guide 28, capstan 30 with pinch roller, fixed post 32, take-up After passing through the pull guide 34 and fixed post 36, it is wound up by the take-up reel 6. It is now possible to By the way, in the winter, the rotating drum mentioned above may be cold and suddenly heat up the room. In some cases, for example, dew condensation may occur on the surface of the aluminum die-cast rotating drum 20. If you run a magnetic tape with dew on it, the magnetic tape 8 may become damaged due to condensation. may wrap around the rotating drum 20 and cause damage. In order to prevent this, conventionally, as shown in FIG. A dew sensor 38 and a heater 40 are provided nearby, and the dew sensor 38 detects dew condensation. If so, a dew warning will be issued and the heater 40 will be energized to prevent the rotating drum 20. It was supposed to heat up and evaporate the condensation.

0003

[Problem that the idea aims to solve]

However, in the configuration described above, electricity is not started to flow to the heater. In some cases, it may take more than 10 minutes for the rotating drum 20 to warm up and remove the dew. However, there was a problem in that the equipment could not be used during that time. This invention was created to focus on the problems mentioned above and to effectively solve them. It is something. The purpose of this invention is to force condensation to occur when condensation occurs on the rotating drum. An object of the present invention is to provide a device for removing dew from a rotating drum that can remove dew in a short period of time. .

0004

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has developed a magnetic tape that rotates while making contact with a running magnetic tape. Attached to a recording/playback device that has a rotating drum that records and plays back information. The dew removal device includes a dew sensor provided near the rotating drum and a rotary lever. a moisture absorbing roller provided on the rotary drum and supported so as to be able to contact the rotary drum; a dew wiping member provided on the lever and in contact with the dew sensor to wipe off dew, and a dew wiping member provided on the lever; a drive means for rotating the bar; and a drive means for rotating the bar when the dew sensor detects dew condensation. and a control means for energizing the rotary lever to rotate the rotary lever. .

[0005]

[Effect]

Since the present invention is configured as described above, when the dew sensor detects dew condensation, the control means rotates the rotary lever by energizing the drive means. Then this rotating lever The moisture absorbing roller attached to the end of the will be removed. Also, when the rotation lever rotates at the same time, this The dew wiping member attached to the lever comes into contact with the dew sensor, and the dew wiping member attaches to the dew sensor. Wipe off any condensation.

[0006]

【Example】

An embodiment of the rotary drum dew removal device according to the present invention will be described below based on the attached drawings. This will be explained in detail. Figure 1 is a plan view of a rotating drum dew removal device according to the present invention, and Figure 2 is a side view of the main part in Figure 1. 3 is a side view showing a portion of the rotating drum in FIG. 1. Same parts as conventional equipment The same reference numerals are given to the parts, and the explanation thereof will be omitted. In FIG. 1, VTR or The tape loading section of a recording/playback device such as a DAT is shown, and a rotating drum 20 is shown. For example, a helicarrier where the video signal track is recorded diagonally to the magnetic tape. A rotating drum for scanning is provided, and an upper drum with a video head on the top. 20a is formed. Below this rotating drum 20, there is a A motor drive 42 for rotational driving is provided. Moreover, this rotating drum 20 A motor drive 42 for rotationally driving this is provided below. Also, this As in the case shown in FIG. 6, various rollers and posts are placed around the rotating drum 20. Guides, guides, etc. are arranged either fixedly or movably. A dew removal device 44 according to the present invention is provided around the rotating drum 20. It will be done. This dew removal device 44 includes a dew sensor 4 provided near the rotating drum 20. 6, a moisture absorbing roller 48 supported so as to be able to come into contact with the rotating drum 20, and the dew roller 48, a dew wiping member 50 that comes into contact with the sensor 46 to remove dew, and a drive that rotates a rotary lever 52 It mainly consists of a means 54 and a control means 56 for controlling the driving means etc. Ru.

[0007] Specifically, the rotary lever 52 is rotated to the substrate 58 via a rotary shaft 60. The moisture absorbing roller 48 is attached to the shaft so as to be movable, and the moisture absorbing roller 48 is attached to a protruding portion at one end of the shaft. The rotary lever 52 is rotatably attached via the lever 62 and rotates the rotary lever 52. It comes into contact with the upper drum 20a of the rotating drum 20. child The surface of the moisture absorbing roller 48 is coated with fine mesh, for example, in order to obtain good moisture absorption. A cover cloth 64 is formed. On the other hand, as shown in FIG. The dew wiping member 50 made of fine cloth is attached, and this dew wiping member 50 is made of fine cloth. A hook-shaped mounting bracket 66 is mounted below the base plate 58 on the base plate 58. The above-mentioned dew sensor 46 is installed and fixed by the rotation lever 52. The lower surface of the dew wiping member 50 and the dew sensor 46 come into contact with each other as the sensor 46 moves. It is designed to wipe off any condensation that may have adhered to the surface. In addition, under normal circumstances, The rotary lever 5 is arranged so that the sensor 46 and the dew-wiping member 50 are spaced apart in the horizontal direction. The rotation angle of 2 is set. The drive source for rotating the rotary lever 52 is, for example, a solenoid. The driving means 54 is mounted on the substrate 58 via a holding plate 68. At the tip of the plunger 70, which is a movable iron core in the solenoid 54 as a driving means, In this case, one end of the wire or rod 72 extending to one end of the rotating lever 52 is stopped. It is attached and fixed by the female screw 74, and is also attached to the wire or rod 72. The end portion is bent downward to form a bent portion 76, and this bent portion 76 is rotated as described above. By fitting into the hole formed at one end of the lever 52, the rotating lever 52 can be rotated. and the solenoid 54 are connected. In FIG. 2, the solenoid 54 Indicates the condition.

[0008] A compression coil spring 7 is attached to the plunger 70 of the solenoid 54. 8 is wound, and a rubber stopper 80 is provided at its base end to soften the impact force. At the same time, an E washer 82 for a stopper is provided at the tip. and , the moisture absorbing roller 48 moves by a distance S with respect to the stroke ΔS of the solenoid 54. It moves to come into contact with the rotating drum 20 (see FIG. 3). On the other hand, the control means 56 for controlling the drive of the solenoid 54 is also shown in FIG. For example, a microcomputer that exclusively controls the mechanical parts of a device. The detection signal from the dew sensor 46 is amplified by the amplifier 84 and inputted. It looks like this. . The control means 56 controls the software based on the detection signal. A drive signal is output to the solenoid 54 via the lenoid drive 86. It has become. Further, the control means 56 controls the rotating drum 20 to a certain position when wiping off condensation. Outputs a control signal to the motor drive 42 to rotate at a low speed for a fixed period of time It is supposed to be done. Although not shown, this control means 56 also includes It receives various sensor signals and key input signals, and also controls other drive systems.

[0009] Next, the flowchart shown in FIG. 5 regarding the operation of the present invention configured as described above will be explained. This will be explained with reference to the following. First, if the recording/playback device equipped with this exposure device is powered off, the software Since the lenoid 54 is not energized, the compression coil spring 78 provided thereon The plunger 70 is pulled outward due to the action of the moisture absorbing roller 4. 8 is located away from the rotating drum 20. Then, when the power of the recording/playback device is turned on in this state (S1), the dew removal device It is determined whether the dew sensor 46 in the position 44 is on (S2). Here, the rotating drive If the atmosphere is such that dew condensation may occur on the ram 20, install it near the rotating drum 20. Condensation also occurs in the dew sensor 46, which turns on and indicates that no condensation has occurred. If not, it is off. In the case of NO in S2 above, that is, If no condensation has occurred, normal playback or recording will begin immediately. (S3).

0010 On the other hand, if YES in S2 above, that is, dew condensation has occurred. In this case, the control means 8 outputs a drive signal to the motor drive 42 to drive the rotary drive. The ram 20 is rotated at a low speed (S4). And furthermore, solenoid drive 8 6, and the solenoid 54 is energized (S5). This results in , since the plunger 70 is attracted against the elastic force of the compression coil spring 78. , the wire or rod 72 is pulled by a stroke ΔS, which causes rotation. The lever 52 rotates counterclockwise around the rotating shaft 60, and therefore absorbs moisture. The roller 48 moves by a distance S and comes into contact with the upper drum 20a of the rotating drum 20. Ru. As a result, the moisture absorbing roller 48 is brought into contact with the upper drum 20a. As the drum 20a rotates, the dew adhering to the drum 20a is removed from the moisture absorbing roller 48. Dew is absorbed by the fine mesh cloth 64 on the surface and condenses from the surface of the rotating drum 20. is excluded.

[0011] Also, at the same time that the moisture absorbing roller 48 comes into contact with the rotating drum 20, the rotating lever The dew wiping member 50 provided at the other end of the dew sensor 52 contacts the dew sensor 46 and does not adhere to the dew sensor 46. The condensation that has formed will be wiped off (S6). Then, in order to perform the dew condensation removal operation from the rotating drum 20 described above for a certain period of time, , the solenoid 54 is held under suction for a certain period of time (S7). solenoid 54 After a certain period of time has elapsed after suction, the dew sensor 46 is checked again to see if it is off. (S8). Here, if the amount of condensation is so large that it cannot be wiped off in one go, In this case, since dew condensation remains, the answer is NO in S8 and the process returns to S4 above. Then, the dew condensation removal operation described above is performed again. This operation is performed on the dew sensor 46. If condensation is detected, the process is repeated many times.

0012 Also, if the answer is YES in S8 above because there is no residual condensation Then, the process shifts to normal recording and reproducing operations (S9). In this way, in this embodiment, when dew condensation occurs on the rotating drum 20, , dew condensation is forcibly absorbed and removed by the moisture absorbing roller 48 instead of being heated and evaporated. becomes possible. In addition, when removing dew condensation, the rotating drum 20 should be rotated at a slower speed than normal. Therefore, there is no possibility of damaging the video head etc. installed on the rotating drum 20. stomach. Note that this embodiment can be applied to all recording/playback devices that have a rotating drum. Of course.

[0013]

[Effect of the idea]

In summary, according to the present invention, dew condensation on the rotating drum is removed by the moisture absorbing roller. This allows condensation to be quickly removed. Therefore, you can record data immediately without having to wait for a long time to remove condensation as with conventional devices. , playback operations can be performed.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a rotary drum dew removal device according to the present invention.

FIG. 2 is a side view showing main parts in FIG. 1.

FIG. 3 is a side view showing a rotating drum and a moisture absorbing roller in FIG. 1;

FIG. 4 is a schematic diagram of a control system of the exposure device of the present invention.

FIG. 5 is a flowchart for explaining the operation of the present invention.

FIG. 6 is an explanatory diagram for explaining loading of a magnetic tape of a video cassette.

FIG. 7 is a plan view showing a conventional exposure device.

[Explanation of symbols]

8... Magnetic tape, 20... Rotating drum, 22... Video head, 44... Dew removal device, 46... Dew sensor, 48... Moisture absorption roller, 50... Dew wiping member, 52... Rotation lever, 54... Solenoid (driving means), 56...Control unit, 64...Fine mesh cloth.

Claims (1)

[Scope of utility model registration request] 1. In a dew removal device attached to a recording/reproducing device having a rotary drum that records and reproduces information by rotating while contacting a running magnetic tape, the dew sensor is provided near the rotary drum. a moisture absorbing roller provided on the rotating lever and supported so as to be able to contact the rotating drum; a dew wiping member provided on the rotating lever and contacting the dew sensor to wipe off dew; 1. A dew removal device for a rotating drum, characterized in that the dew removal device for a rotating drum is equipped with a drive means for activating the drive means and a control means for rotating the rotary lever by energizing the drive means when the dew sensor detects dew condensation.