JPH0531225B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the running system of a tape making device, and particularly to standard tapes or transfer master tapes for mass-produced video tape recorders (VTRs) that require mechanical stability. The present invention relates to the running system of a tape producing apparatus such as the following.

[Prior Art] In the running system of a VTR, it is necessary to remove various vibrations and ensure stable operation to prevent problems such as wow, flutter, jitter, and skew. Therefore, for example, in VTRs used for home use, various types of servo mechanisms are used to ensure stable running.
A tension regulator or the like is used to minimize expansion and contraction of the tape.

In addition, an impedance roller with a large moment of inertia is used to prevent short-period vibrations, and also to prevent long-period vibrations such as those caused by changes in friction between the tape and the fixed post. Rotating rollers using metal bearings are known to be effective in preventing this.

On the other hand, in the standard tape making device mentioned above,
An air column is used to eliminate tension variations on the tape supply roller as well as vibrations caused by the drive motor, and an impedance roller is used, which has an even greater moment of inertia than a home VTR, but does not rotate. Fixed posts have conventionally been used as posts for regulating tape height provided on the front side of the head.

[Problems to be Solved by the Invention] However, in the running system of the conventional tape making apparatus as described above, vibrations caused by the supply reel are effectively suppressed by an air column that sucks the tape together with air into the box. However, in the process of removing the vibrations, the length of the tape sucked into the air column in a U-shape changes in relation to the cycle of the vacuum pump, etc., and new vibrations occur. Furthermore, while the fixed post that guides the tape from the outlet of the air column to the impedance roller eliminates vibration, it also induces longitudinal vibration in the tape direction due to the expansion and contraction effect due to friction between the post and the tape. Furthermore,
Impedance rollers also eliminate short-cycle vibrations, but since ball bearings are used in their bearings, vibrations caused by the discontinuity of the ball bearings cannot be avoided, and the ball bearings used in the capstan also generate new vibrations. In conventional running systems, various vibration removal means tended to become new sources of vibration.

In particular, this type of vibration has short and long periods, and each type of vibration removal means can only remove periodic vibrations within a relatively narrow range, and one type of vibration removal means cannot completely remove the vibrations. It's not something you can get rid of. In addition, in the case of fixed posts, capstans, impedance rollers, full-width erasing heads, etc., the length of the tape corresponds to the length of the tape between them, depending on the combination of the rollers placed before and after them and the distance between them. String vibration tends to occur, and conventionally,
Measures against such vibrations have not been sufficient.

The purpose of the present invention is to focus on the above-mentioned conventional problems,
In order to solve this problem, it is an object of the present invention to provide a running system for a tape making apparatus that can suppress secondary vibrations and realize completely stable tape running.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an impedance roller, a full-width erasing head, a rotary head and a tape running path between a supply reel and a take-up reel. In a running system of a tape making apparatus in which A/C heads are sequentially arranged, upstream and downstream sides of the impedance roller, upstream sides of the full-width erasing head, upstream sides of the rotary head, and upstream sides of the A/C heads. The feature is that a rotating roller is provided in each.

[Function] According to the present invention, among the vibrations that could not be removed by the rotating roller provided on the upstream side of the impedance roller, the vibrations that could not be removed by the members disposed on the travel path to the impedance roller are relatively long. The periodic vibrations can be effectively removed, and the next impedance roller removes the short periodic vibrations, and the signal generated on the impedance roller by the rotating roller provided downstream of this impedance roller is removed. Next, the string vibration generated between the rotating roller provided downstream of the impedance roller and the full-width erasing head is removed by the rotating roller provided upstream of the full-width erasing head, and the vibration of the full-width erasing head and the rotating head assembly is removed. The string vibration generated between the instrument and the inclined post provided at the entrance is removed by a rotating roller provided downstream of the full-width erasing head, that is, upstream of the rotating head, and the inclined post provided downstream of the rotating head and A String vibration between the A/C head and the A/C head can be removed by a rotating roller provided upstream of the A/C head.

[Examples] Examples of the present invention will be described in detail and specifically below.

FIG. 1 shows an embodiment of the invention. Here, 1
is a panel substrate, and the panel substrate 1 is made of, for example, a 1-inch thick aluminum plate in order to prevent the vibrations of each device from being transmitted to other devices via the substrate 1. 2 is the rotary head 3 and audio control head (A/C
Head) 4 is attached to the head assembly,
It is fixed to the panel 1 with screws. 5 is a supply reel, 6 is a take-up reel, and the tape 7 is pulled out from the supply reel 5 while being applied with tension in the winding direction by a winding direction winding capstan and a pinch roller 8; The recording written on the tape 7 is first erased by the full-width erasing head 9, and then the video signal is erased by a video head (not shown) attached to the rotary head 3. written. The reference line of the control track and the writing of the audio track are then performed at the A/C head 4.

10 is a timer roller, and a rotary encoder (not shown) is directly connected to the timer roller 10, and the length of the tape wound onto the take-up reel 6 is measured by the rotary encoder and displayed on a display (not shown). . Reference numeral 11 denotes a tension post, and in the tension post 11, by changing the angle of its arm, it is possible to always maintain a constant tension on the tape according to the amount of tape wound on the take-up reel 6. . In addition, the supply reel 5
A tape end sensor 12 provided near the tape end sensor 12 is for detecting an end mark recorded near the end of the tape 7.
2, the end mark can be detected and the tape supply can be automatically stopped.

Reference numeral 13 denotes a reverse take-up capstan and a pinch roller, which are used when rewinding the tape.The reverse take-up capstan 13 applies tension to the tape 7 so that it can be pulled out from the take-up reel 6. Note that 14A and 14B are reverse direction winding rotating rollers, which are provided to remove the load applied to the impedance roller 15 during rewinding. Then, the spindles of the reverse take-up rotation rollers 14A and 14B are moved in directions opposite to each other along the circumferential direction of the arrows, so that the tape 7 is separated from the impedance roller 15.

Next, with reference to FIGS. 1 and 2, means for suppressing vibrations generated in each part will be described.

Reference numeral 16 denotes the air column mentioned above. In the air column 16, by sucking air into the box body, the tension, which changes according to the amount of tape remaining on the supply reel 5, is kept constant, and the supply To eliminate vibrations caused by uneven drive rotation of the reel 5.

17 is a rotating roller provided on the inlet side of the air column 16, and serves to smoothly introduce the air into the air column 16. 18, 19, and 20 are fixed posts, among which fixed posts 19 and 20 provided on the outlet side of the air column 16 remove a part of the vibration secondarily generated by the air column 16.

21 and 22 are sub-impedance rollers (rotating rollers) disposed on the inlet and outlet sides of the impedance roller 15, respectively. to suppress vibrations from occurring. In addition, the roller body is made of a lightweight and wear-resistant material, such as a resin material such as Teflon (trade name), which reduces the moment of inertia so that it can rotate easily. Can remove long cycle vibrations.

That is, the vibrations remaining in the air column 16 are removed by the rotating roller 21 at the front stage, and the vibrations newly generated through the ball bearings of the impedance roller 15 are removed by the rotating roller 22 at the rear stage. By providing the impedance roller 15 with its mass, short-period vibrations are eliminated by the flywheel effect.

23 and 24 are rotating rollers disposed on the entrance and exit sides of the full-width erasing head 9, of which the rotating roller 24 also serves as a regulating post for regulating the height of the tape 7 with respect to the rotating head 3. Hereinafter, 24 will be referred to as a regulating rotation roller. That is, conventionally, a fixed post has been used to regulate this, but longitudinal vibration is generated due to friction between the post and the tape, and in this example, a rotating roller is used instead of a fixed post. Thus, the combination of the rotating roller 23 and the regulating rotating roller 24 can eliminate chordal vibrations between the rotating roller 22 and the full-width erasing head 9 and between the full-width erasing head 9 and the inclined post 25, respectively. Further, 26 is an inclined post provided on the exit side of the rotating head 3, and 27 is a rotating roller, which also serves as a regulating post like the regulating rotating roller 24 described above. Then, this regulating rotation roller 2
7 makes it possible to eliminate vibrations generated by the rotating head 3. Note that 28 is a regulating post provided on the exit side of the A/C head 4, and 29 and 30 are guide rollers.

[Effects of the Invention] As explained above, according to the present invention, an impedance roller, a full-width erasing head, a rotary head, and an A/C head are provided in the running path of the tape running between the supply reel and the layout reel. In the running system of the tape making apparatus, rotating rollers are provided upstream and downstream of the impedance roller, upstream of the full-width erasing head, upstream of the rotating head, and upstream of the A/C head, respectively. This arrangement almost completely eliminates vibrations generated by the supply reel, air column, impedance roller, and rotating head, and also eliminates string vibrations, especially those generated between the fixed posts, rollers, and heads. By eliminating string vibrations between the rotating roller and the tilted post after the impedance roller, extremely stable tape running can be achieved, making it easy to use like a standard tape making machine or master tape making machine. , it can exhibit a particularly remarkable vibration-proofing effect in applications where a high degree of stability is required in the running system.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an example of the running system of the tape producing apparatus of the present invention, and FIG. 2 is an enlarged view of the vicinity of the reverse direction winding rotating roller. 1... Panel board, 2... Head assembly, 3... Rotating head, 4... A/C head, 5
... Supply roll, 6 ... Take-up reel, 7 ... Tape, 8, 13 ... Capstan and pinch roller, 15 ... Impedance roller, 16 ... Air column, 21, 22, 23, 24, 27 ... Rotating roller, 25, 26... inclined post.

Claims (1)

[Claims] 1. In a running system of a tape making device in which an impedance roller, a full-width erasing head, a rotary head, and an A/C head are sequentially arranged on the running path of a tape running between a supply reel and a take-up reel, the impedance roller upstream and downstream,
1. A running system for a tape making apparatus, characterized in that rotating rollers are disposed upstream of the full-width erasing head, upstream of the rotary head, and upstream of the A/C head.