JPS6214357A - Tape feeding device - Google Patents

Abstract

PURPOSE:To obtain a small and cheap device by providing a plate shape member on which barometer is formed to obtain a rotation signal relating with the reel board out of a pair of reel boards and making a friction load for braking through the member to work the reel board. CONSTITUTION:Since a gear 59 is rotated in a reverse direction and the axis 97 of the second idler gear 91 is moved to the inside of the corner part 99c of a cam 99, the gear 91 is not linked with a gear 103. Consequently, the reel board 105 is rotated only with being given the braking load of the torque of a gear 109. The sagging or the delivery of a tape due to the brake torque of the gear 109, when a tape operation is shifted from fast rewinding to stopping, can be prevented. A metallic plate 155 is loaded under a reel board 105, and a cushioning material 156, such as felt, etc. is inserted between the metallic plate 155 and a lever 157, and a braking operation is performed with friction at the part due to magnetic attraction generated between the metallic plate 155 and the lever 157. Thus, the detection of the rotation of the reel board nd the constitution to give the braking load can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a tape feeding device, and particularly to an improvement in its reel control system.

[Prior art]

Tape feeding devices are commonly used in devices that perform magnetic recording and reproduction.6 For example, video tape recorders (hereinafter referred to as VTRs), which have recently become popular at an alarming rate, are a good example.

Conventionally, in the reel drive system of a VTR, for example, a band brake type pack tension controller or a DD (direct drive) was used for the supply side reel stand.
This type is equipped with an electric brake servo that detects the occurrence of pack tension.

On the other hand, such a tension controller has not been given much consideration for the reel stand on the first take-up side. However, when a function such as reverse playback is provided, such a tension controller is naturally required for the winding reel 1 as well. The mechanisms proposed in the past, especially the mechanical ones, are relatively complex, and the devices are large and require 11 separate units.

(Of course, in the case of the DD method, such disadvantages can be eliminated, but on the other hand, the number of motors increases, making it expensive and difficult to reduce weight.) On the other hand, 1. Apart from the above, for example, when trying to calculate the running speed of the tape, the winding value υ, etc. electronically (using an electronic f tape counter, etc.), it is necessary to submit the rotation of the reel stand. However, adding a means for detecting rotation to the take-up reel stand described in L would further complicate the structure and increase the size.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a tape feeding device that can extremely simplify the configuration for detecting the rotation of the reel stand and applying the brake load, and can be made small and inexpensive. do.

〔Example〕

Based on the embodiment shown in the drawings below, Book 9. lJI will be explained in detail.

FIG. 1 shows an embodiment of the present invention in a normal recording and reproducing state in a VTR equipped with the embodiment of the present invention. A pulley 55 is attached coaxially to the driving force transmission section 53km★4. Timing belt or rubber belt 5
7 transmits driving force to the first gear 59, and a second gear 61 mounted coaxially therewith rotates the first idler gear 63.

The pinch roller 65 is supported at the tip of the moving lever 69,
The spring 71 is attached to the lever 69 by the force of the solenoid 67.
As a result, the pinch roller 65 is brought into pressure contact with the capstan shaft 51. This pinch roller 6
5 is restored by the elastic force of the spring 72. The first v1 conversion lever 73 is rotated about a fulcrum 77 by the lever 75 in conjunction with the movement of the solenoid 67.

The lever 75 is returned and held by a spring 79.

The second switching lever 81 is connected to the first switching lever 73.
It is interlocked by the post 83 of the side arm 73a. This second
The switching lever 81 is operated according to the guides 85a and 85b as shown in FIG. It is movable horizontally.

The third switching lever 87 is interlocked with the first switching lever 73 by a connecting point 89 at its tail end. A second idler gear 91 for fast rewinding and fast forwarding is disposed on the third switching lever 87'' via levers 93 and 95. Central shaft 9 of second idler gear 91
7 is a lever 87 along the inner circumference of the approximately triangular cam 99.
move with the motion of

A slip mechanism is provided between the two gears 101 and 103, and the gear 103 is gear-coupled to a take-up reel stand 105. Therefore, when the reel stand lO5 is driven by the gear 101 of -JT through the gear 103, the torque limiter is set to IIk, and when it is driven directly from the other gear 103, the torque is directly applied.

A brake mechanism is also arranged for the reel stand 105. That is, two other gears 107 and 109 are connected, and the gear 109 is moved to the gear 1 by the rotation direction of the gear 107 and the movement of the lever 111 by turning on and off the pinch roller 65.
13 and will be connected and unconnected.

FIG. 2 shows the second VJ conversion lever 81 and its surrounding gears in FIG. 1. In FIG. 0, both gears 59 and 61 are coaxial as described above.

The first idler gear 63 is disposed on the lever 121 with a predetermined shaft spacing so as to be connected to the gear 59. Here, the connection of the gear 63 to the gear 101 is turned on and off by a slip mechanism (not shown), such as a mechanism based on a change in eddy current or reluctance of a magnet, a mechanism based on felt and a spring, etc., to rotate the gear 59.61. This is done depending on the direction. Further, the second switching lever 81 is movable in the horizontal direction in the figure by the movement of the solenoid 67 (see FIG. 1). By moving the lever 81 toward the force, the tip 123 of the lever 121 and the tip 125 of the lever 81
The first idler gear 63 is in pressure contact with the gear 10 during the return of the pinch roller 65 and during the return maintenance of the pinch roller 65.
You will be able to separate from 1.

Next, the operation during normal recording and playback will be explained with reference to FIG. The capstan drive unit 53 is moved in the direction of the arrow in the figure (counterclockwise).
gears 59 and 61 via interlocking belt 57.
Rotate in the direction of the arrow (counterclockwise). Accordingly, the idler gear 63 connected to the gear 59 is in gear 1.
It moves in the direction of 01 and connects with gear 101. Therefore, the reel stand 105 shifts to the gear l via a slip mechanism (not shown) between the phases n of the gears 101 and 103.

3, and the tape is wound up by a predetermined torque. The gear ratio is selected to be 2 to 3 times the predetermined rotation speed of the reel stand 105 during idle rotation. At this time, since the pinch roller 65 is on, the first S/J exchange bar 73 is in the position shown, and the lever 87 moves the second idler gear 91 onto the corner part 99a of the cam 99. , so that the gear 91 is not connected to the rotating gear 59. Further, due to the clockwise rotation of the gear 109, the gear 109 that applies brake torque is disconnected from the gear 113, and therefore, the reel stand 105 is in a state where there is almost no brake load. Note that 170 is a stopper for the gear 109 at this time.

Here, since the supply side reel stand is driven by a directly connected motor, tape tension control is performed electrically as is well known.

In addition, even in fast forward search or slow playback, only the rotational speed of the capstan changes, and other operations are basically performed as shown in FIG.

FIG. 3 shows the case of reverse FN raw and reverse search.
Now, the capstan drive unit 53 rotates in the direction of the arrow (clockwise), contrary to the case shown in FIG.

Accordingly, via the belt 57, the gears 59 and 6
1 rotates in the direction of the arrow (clockwise direction), the idler gear 63 is separated from the gear 101. Therefore, the gear 63 will idle. On the other hand, the reel stand 105 rotates in the direction of the arrow (counterclockwise) as the tape is pulled out.
rotates in the same direction and connects with gear 113. In this state, the total torque of the slip mechanism of gear 109 and the load torque applied to gear 113 provides appropriate hex tension to reel stand 105 during reverse playback. As a result, the running stability of the tape is maintained.

Here, the reel on the supply side winds up the tape with a predetermined torque without performing tension servo.

Next, the operation of the tape in the FF, FR) state will be explained.

Figure 4 shows solenoid 6 in Figure 0 which shows the state of FF.
7 is turned off, the lever 75 moves in the direction of the arrow (
(downward) D, and the first switching lever 73 is at the fulcrum 77.
Rotate in the direction of the arrow (clockwise) around . As a result, the third switching lever 87, which is connected to the same lever 73 at a connecting point 89, moves in the direction of the arrow (right direction 1) RU.

At this time, the fulcrum 95a of the lever 95 is restricted from moving downward in the figure by a guide groove (not shown), and therefore the lever 95 moves in the direction of the arrow (1 direction).
The shaft 97 of the second idler gear 91 moves toward the corner part 99b of the cam 99, and the second idler gear 91 moves toward the corner part 99b of the second idler gear 91, and
Connect with 03. At this time, the gear 109 is connected to the gear 113 because the tip pin 131 of the lever lll moves in the direction of the arrow (lower left direction) LD to press the lever 133 with respect to the gear 109 that functions as a brake load for the reel stand 105. Therefore, only the torque of the gear 109 is applied to the reel stand 105 as a load.

The capstan drive unit 53 moves in the direction of the arrow (
(counterclockwise), each of the connecting gears rotates in the direction of the arrow shown, and enters the FF state.

Here, due to the movement of the second switching lever 81 that is linked to the first switching lever 73, the tip 123 of the lever 121 and the tip 125 of the lever 81 shown in FIG.
Movement of the lever 121 is restricted. Therefore, the gear 10 is shifted from the gear 61 based on the rotation of the first idler gear 63.
Drive transmission to No. 3 is not performed.

FIG. 5 shows the FR state, and the basic movement of the lever is exactly the same as in FIG. 4. However, the gear 59 rotates in the opposite direction (clockwise) and the shaft 9 of the second idler gear 91
7 moves inward to the corner portion 99c of the cam 99, and therefore the gear 91 is not connected to the gear 103. Therefore, the reel stand 105 rotates only with the torque of the gear 109 acting as a brake load. The brake torque of this gear 109 prevents tape slack or tape feeding when transitioning from early spring return (FR) to stop 1 (STOP).
is planned. At this time, the supply reel is winding up the tape at a predetermined number of rotations, similar to the search in the reverse direction.

FIG. 6 shows the above-mentioned reel stand relative to the reel drive shaft 151 having the cap member 152 at the tip in FIG. 105 and gear 107 are integrally engaged, and a reel drive spindle 153 and a coil spring 154 are arranged between the cap member 152 and the reel stand 105. Gear 109 is west swing lever 157l
: is supported by a shaft 159. This lever 157 is made of plastic mixed with a magnetic material, and is multi-pole magnetized in the direction of the reel shaft 151. - On the other hand, an iron plate 155 is installed under the reel stand 105 so as to face this lever 157, and there is a felt between the iron plate 155 and the lever 157. A cushioning material 156 is inserted, and the iron plate 155
The braking operation is performed by the friction of this part due to the magnetic attraction between the lever 157 and the lever 157. Furthermore, a light and dark pattern for forming a reel stand rotation signal is provided on a portion of the iron plate 155 that is outside the surface facing the cushioning material 156.

The gear 113 is supported by a shaft 162, and a fixed base 164
An Il damping material 163 such as felt is inserted between the two, and a spring 165 reduces the frictional load. A reflective food sensor 158 is placed on the reel stand 105 to detect a light and dark pattern provided on the iron plate 155-L and use it as a rotation signal for the reel stand 105.

Incidentally, the rotation signal in this case is used for calculating the tape running amount, winding amount, etc.

As explained below, according to this embodiment, the iron plate for switching the brake load on the reel stand is configured to also serve as a frequency generator, so that the frequency generator for the reel and the brake load means have an extremely inexpensive device configuration. Become. In addition, the supply reel is precisely tension-controlled by a directly connected DD motor, and the winding side is configured to transmit driving force from the capstan, making it a cheaper and lighter tape feeder than conventional tape feeders. It is possible to configure a VTR equipped with

Further, by simply rotating the reel stand, a torque limiter works on the FF side during normal recording/reproduction and search, while a predetermined brake torque is applied to the take-up reel stand to stabilize the tape during reverse feeding.

Also, gear switching in FF and FR, and reel stand load on the winding side! /1 change is done in a simple configuration based on turning on and off the pinch roller, resulting in a very simple configuration.

These changes can be made independently of other loading mechanisms. Therefore, VTRs equipped with this tape feeding device will become more lightweight.

Further, in the embodiment, the winding side is used, but it may be applied to the supply side.

Furthermore, although the two embodiments have been described with reference to the case where the present invention is mounted on a VTR, it is of course applicable to a wide range of other apparatuses for running tapes for recording and reproducing.

Furthermore, the present invention is applicable not only to tapes for recording and reproducing, but also to devices for running long tape-like objects that are sent and received between at least a pair of sending and receiving sides.

[Effects of the Invention] As detailed above, according to the present invention, the configuration of the rotation detection of the reel stand and the brake load application can be extremely simplified.
A small and inexpensive tape feeding device can be realized.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of a tape feeding device according to an embodiment of the present invention, FIG. 2 is an enlarged view of the section in FIG. 1, and FIGS. 3, 4, and 5. Reverse playback in a VTR equipped with the device according to the present invention, #P8 capture (FF)
and FIG. 6 is a side view showing the configuration of the reel stand shown in FIG. 1 and gears connected thereto. 51...Capstan shaft 53...Capstan drive section 55...Transmission belt 59.61...Transmission gear 63.91... Idler gear 67...Pinch solenoid 73.81.87,111...Auto switching lever 105
...Reel stand Fig. 7 107 ... Gear 109 ... Transmission gear

Claims (1)

[Scope of Claims] 1) In a tape feeding device that feeds and receives tape between at least a pair of reels, a plate-shaped plate forming an index for obtaining a rotation signal related to a reel stand of a pair of reel stands; What is claimed is: 1. A tape feeding device characterized in that a member is provided, and a frictional load for braking is applied to the reel stand through the plate-like member. 2) The tape feeding device according to claim 1, wherein the plate-like member is an iron plate, and the indicators formed thereon are light and dark patterns. 3) A magnetic member is provided on the iron plate, and the magnetic attraction between the two causes the magnetic member to interlock with the iron plate via a friction member, and when the reel stand rotates in the tape payout direction, 3. The tape feeding device according to claim 2, wherein the rotation of the magnetic member corresponds to the rotation of the magnetic member so that the load of a frictional load member provided elsewhere acts on the reel stand.