JPS61196460A - Tape loading mechanism for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain thickness reduction and high-density recording at the same time by holding the 1st and the 2nd entry-side tape guide bodies at the shortest distance in a period where the 2nd entry-side tape guide body exits from the opening part of a tape cassette and reaches a specific loading end position. CONSTITUTION:The distance l between the 1st and the 2nd entry-side tape guide bodies 9 and 11 is equal to l2 during loading when omega=0-omega1. This means that the loading operation is performed while the distance between the 1st and the 2nd entry-side tape guide bodies 9 and 11 is sufficiently short, and a magnetic tape 4 is drawn out smoothly without contacting the tape cassette 3 nor the top end surface of a payoff reel 5. Consequently, the interval between the two tape guide bodies which are arranged at the same side of a cylinder is easily set to an optional proper value between a loading completion state and an unloading completion state.

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to a helical scan type magnetic recording/reproducing device, and particularly to a tape loading mechanism suitable for achieving higher density recording and thinner magnetic recording/reproducing devices. [Background of the Invention] Generally, in a helical scan type magnetic recording and reproducing device that uses a tape cassette to record and reproduce signals, the magnetic tape is pulled out from the tape cassette and guided along a predetermined tape running path around a cylinder during recording and reproduction. A tape loading mechanism is used for loading the magnetic tape, and for retracting the magnetic tape from the tape running path and storing it in the tape cassette at the end of recording and reproduction. by the way. In recent years, there has been a remarkable trend in magnetic recording and reproducing devices to achieve long-term recording while also downsizing them. For this reason, the tape cassettes used are thin tapes (10 μm thick) with high surface properties capable of high-density recording. In a magnetic recording/reproducing device that uses such a compact tape cassette, the loaded thin magnetic tape is not subjected to excessive tape tension, and the magnetic tape is It is necessary to form a tape running path so that the tape can run smoothly around the cylinder equipped with the head. FIG. 3 is a plan view showing a conventional example of a tape loading mechanism proposed to meet such requirements, where the solid line indicates the loading state of the magnetic tape, and the two-dot chain line indicates the unloading state of the magnetic tape. It shows. In the figure, l is a chassis, 2 is a cylinder, and 3 is a tape cassette. 4 is a magnetic tape, 5 is a supply reel, 6 is a take-up reel, 7a and 7b are guide bins, 8 is an opening, 9 is a tape guide in the entrance path 1, and 9a is a guide roller. 9b is a tilting bin, 9c is a positioning bin, 9d is a guide base, 9e is a compression spring, and 9f is a connecting member. 10 is a positioning member, 11 is a tape guide for the entrance path 2,
l1m is a guide roller, llb is a tilt bin. 11c is a positioning bin, and 11d is a guide base. 11a is a compression spring, Iff is a connecting member, 12 is a positioning member, 13 is a loading ring, and 14 is an elongated hole provided in the longitudinal direction of the loading 13. This long hole 14
includes two shafts 16.1 implanted in the base 15.
7 are fitted, and as a result, the base 15 is movable along the elongated hole 14 while maintaining a constant posture when attached to the loading ring 13. A connecting member tti of the tape guide body 11 of the entrance path 2 is connected to a portion of the shaft 16 that protrudes from the upper surface of the loading ring 13.
is rotatably mounted. 18 is a drive gear that transmits rotational driving force to the loading ring 13, 19 is a tension bin, 20 is a guide bin,
21 is a full width erasing head, 22 is an impedance roller,
23 is a tape guide on the exit side. 23a is a guide roller, and 23b is a positioning bin. 23c is a guide base, and 24 is a positioning member. 25 and 26 are connecting arms, 27 are torsion springs for pressure, 2
8 is a support shaft, 29 is a gear, and 30 is a reduction gear train. 31 is a pinch roller, 32 is a capstan, 33 is an auxiliary guide, and 34 is a drive arm on which the pinch roller 31 is mounted. The symbols shown in FIG. 1 indicate the distances between the connection points of the tape guide 9 of the entry path 1 and the tape guide 11 of the entry path 2 with the respective loading rings 13. Next, the operation of this tape loading mechanism will be explained. In the unloading state where the tape cassette 3 is not installed, the tape guides 9, 11.23 and the pinch rollers 31. The auxiliary guide 33 is located at a position indicated by a dashed double-dashed line with a dash added to each symbol. On the other hand, in the tape cassette 3, the magnetic tape 4 is transferred between the supply reel 5 and the take-up reel 6 via the guide bins 7a and 7b, as shown by the double-dotted dot with reference numeral 4'. It is hung on a pedestal. When this tape cassette 3 is installed as shown in FIG. 1, the supply reel 51 and the take-up reel 6 are placed on reel stands (not shown) installed on the chassis 1, and the tape guides 9 and 11 are placed on reel stands (not shown) installed on the chassis 1. .23 and pinch roller 31. The auxiliary guide 33 is arranged inside the opening 8 and inside the magnetic tape 4'. Then, by command to start loading operation. A loading motor (not shown) rotates to drive the loading ring 13, which causes each tape guide 9 to
, 11.23 move along guide grooves (not shown) provided on the chassis 1 to the positions shown by solid lines, and the drive arm 34 rotates to move the pinch rollers 31. The auxiliary guide 33 also moves to the position shown by the solid line. FIG. 4 is a plan view showing in detail the operation of the tape guide body 9 of the entrance tube 1 and the tape guide body 11 of the input tube 2 at this time, and shows the same V! I (a) shows a state in which loading has been completed, and (b) in the same figure shows a state in the middle of loading or unloading. 14a and 14b are the ends of the elongated hole 14, and 35 is the connecting member 11.
The part f is a stopper member (for example, an E-ring), and parts corresponding to those in FIG. 3 are given the same reference numerals. Hereinafter, the operation of the one-sided tape guides 9 and 11 will be explained using FIG. 4. In the loading completed state, as shown in FIG. 4(a), the shaft 17 implanted in the base 15 comes into contact with the end 14b of the elongated hole 14. Mounting position of the connecting member 11f on the shaft 16 (arrow A)
And the mounting color of the connecting member 9f to the loading ring 13!
(arrow B) is the maximum distance lx. Note that the solid lines in FIG. 3 indicate the positions of each member in this state, and the first and second tape guides 9.11 on the entry side
In this state, the distance between the tape guides 9 and 11 is sufficiently large, and the tape guides 9 and 11 are connected to the positioning members 10 and 12, respectively.
In particular, the tape guide body 11 of the entrance tube 2
is held by a suitable holding member (not shown). Next, when the unloading operation is started and the loading ring 13 rotates in the force direction of arrow C'. The connecting member 9f is a loading ring.

The tape guide body 9 of the entrance cylinder 1 directly attached to [3 starts moving in the force direction of arrow C' with the rotation of the loading ring 13. On the other hand, since the tape guide body 11 of the entry side cylinder 2 is held by the above-mentioned holding means, the base 15 is moved into the elongated hole 14 by the rotation of the loading 13 in the direction of the arrow C' force.
Move relatively within in the direction of the arrow. As a result, arrow B
The mounting position of the connecting member 9f shown by arrow A gradually approaches the mounting position of the connecting member 11f shown by arrow A. The distance between the two tape guides 9.11 becomes progressively smaller. The shaft 16 installed in the base 15 is connected to the elongated hole 1.
4 (b), the tape guide 11 of the entry tube 2 is released from the previous holding means, and as the loading ring 13 rotates, it moves in the force direction of arrow C'. Moving. At this time, the connecting member 9f indicated by arrows A and B. The minimum pressure Ila z is between the mounting positions of the tape guides 11f, and the distance between the tape guides 9 and 11 is the minimum. The distance between both tape guides 9.11 in this state is: Loading ring 1 of connecting member 9f to tape guide body 9
3 (arrow B) and the end 14a of the elongated hole 14 on the loading ring 13 (medium Qz), by setting this distance appropriately,
When unloading is completed, these tape guides 9.1
1 can be brought close to the tape cassette 3 so that it can be stored in a predetermined space in the entrance part 8 of the tape cassette 3. FIG. 5 is a perspective view illustrating the installation state of the cylinder 2 on the chassis 1, where 1'' is a reference plane, 2a is an upper cylinder, 2b is a magnetic head, 2c is a lower cylinder, 2d is a lead, and θ is a As shown in Fig. 5, the entire cylinder 2 is connected to the chassis 1.
Assuming that the cylinder is installed at an angle of γ with respect to a reference plane I' parallel to The length is longer than the actual length of the entire cylinder from the top surface of the driven upper cylinder 2a to the bottom surface of a cylinder motor (not shown) connected to the do portion of the cylinder 2. Therefore, the magnetic recording In order to make the reproducing device thinner, it is desirable to make the inclination angle γ as small as possible so that the height occupied by the entire cylinder 2 is as close to the actual height of the entire cylinder 2 as possible. For this reason, in the conventional example described above, the inclination angle γ of the cylinder 2 with respect to the chassis 1 (reference surface 1') is
is set at an angle approximately equal to the lead angle θ of cylinder 2,
By determining the arrangement of each of the tape guide members described above, the cylinder 2 can be made upright, thereby achieving a thinner magnetic recording/reproducing apparatus. In this case, cylinder 2
The magnetic tape 4 immediately after leaving the cylinder is at almost the same height as the magnetic tape in the tape cassette 3, but the magnetic tape 4 just before entering the cylinder 2 is placed in the tape cassette at a height equal to the width of the tape. 3, and this height position deviation is corrected between the tape guide body 9 of the entrance side part 1 and the tape guide body 11 of the entrance side part 2. Therefore, the more the cylinder 2 is installed upright, the smaller the inclination angle γ is, the larger the correction amount of the height position becomes, and accordingly, the correction interval is
The first tape guide 9 on the side and the tape guide 11 on the entrance side 2
It is necessary to widen the distance between them. By the way, in such a helical scan type magnetic recording/reproducing device, in order to perform good recording and reproduction, it is necessary to maintain the contact pressure between the rotating magnetic head mounted on the cylinder and the magnetic tape at a predetermined value or more. Therefore, in the conventional example described above, back tension is applied to the reel stand (not shown in FIG. 3) on the supply side. However, when using a thin tape of about 10 μm thick,
Since the rigidity of the magnetic t-brake is weak, the tape tension value cannot be set very large, and specifically, it is necessary to keep it to a low value of about 10 to 15 gf at the cylinder entrance point. On the other hand, the back tension value applied to the reel stand should be set as large as possible in order to improve controllability, and in order to satisfy this condition, it is necessary to suppress the increase in tension on the cylinder inlet side as much as possible. becomes. Therefore, the winding angle of the magnetic tape around the fixed guide (inclined pin) with high sliding resistance is reduced as much as possible, and the winding angle around the guide roller where the running load of the magnetic tape is small is increased. We are measuring the conversion of Also,
On the exit side of the cylinder, in order to minimize the increase in tension on the travel path from the cylinder exit point of the magnetic tape to the capstan and pinch roller, the exit side inclined pin is omitted and a guide row is used. In this way, only the tape guide body of the entrance side part 1 gradually changes its height position and rises while pulling out the tape from the tape cassette during the loading process (the tape guide body of the entrance side part 1
(the tape guide moves parallel to the chassis), in the so-called entry side upward loading mechanism, the timing of movement of the tape guide on the entry side wSl and the tape guide on the entry side section 2 is very important. 61st! ! 4 shows an example of the movement timing of the tape guide body 9 of the entrance side section 1 and the tape guide body 11 of the entrance side section 2 in the tape loading mechanism shown in FIGS. 3 and 4. FIG. In the figure, the horizontal axis represents the rotation angle ω of the loading 13, and the vertical axis represents the distance Q between the entrance portion 1 and the second tape guide 9.11. here. Each value of ω corresponds to each of the following states. E-bo 1- (1) O... Unloading operation complete (2)
ω0...The entry side part 1 and the second tape guide start branching in the movement path (3) ω1...The tape guide of the entry side part 2 reaches the positioning member (4) ω2...The tape guide on the entry side 1 starts to rise (5) ω1...The tape guide on the entry side 1 reaches the positioning member (6) ω4... Loading operation completed Figure 7 is an explanatory diagram regarding the problem that occurs when the above movement timing is inappropriate. The same members as in Figure 3 are given common numbers and their explanations are omitted. do. In the same figure, 4a (shown by hatching a solid line)
is the guide roller lla of the tape guide body 11 of the entry side part 2.
The magnetic tape is shown being pulled out while its height position is defined by the figure. In this state, the magnetic tape 4a is pulled upward as the loading operation progresses by a tape guide (not shown) in the entrance section 1, but the magnetic tape after leaving the supply reel 5 is Since the tape passes through the guide roller 11a of the tape guide 11 on the entrance side 2 as shown in FIG. That is, it can be said that the timing of movement of the first and second tape guides on the entry side in this case is appropriate. On the other hand, before the height position of 4b (indicated by the two points am) is defined by the guide roller lla of the tape guide 1 of the inlet 2, The magnetic tape is shown being pulled out upward by the holder. In this state, the magnetic tape 4b after leaving the supply reel 5 is located on the upper end surface of the tape cassette 3 or the supply reel 5 (within the locations indicated by circles El and EF).
This results in significant damage to the top end of the magnetic tape. That is, the timing of movement of the entry side section 1 and the second tape guide in this case is clearly inappropriate. Note that 36 indicates a reel stand. In the example shown in FIG. 6 mentioned above, fl = It 1 in the range of ω = O to ω1 at the time of loading. 29 means that the loading operation is performed in a state where the distance between the tape guide body 9 of the entrance side section 1 and the tape guide body 11 of the entrance side section 2 is large. The magnetic tape that is pulled out is in the state 4b shown in FIG. 7, causing the above-mentioned problem. An example of such movement timing is when the connecting member 11 of the tape guide body 11 of the entry side section 2
This occurs when the base 15 to which f is attached can smoothly move within the elongated hole 14 on the loading 13, and the base 15 is not biased in any direction within the elongated hole 14. If there is a moving load on the tape guide 11 of the entry side 2, the timing of the movement may be different from that shown in FIG. This may cause problems. Note that a tape loading mechanism for a magnetic recording/reproducing device using such an entry side upward loading method is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-218066.
The second conventional example requires a total of three rings: two loading rings that drive the entrance section 1 and the second tape guide, and a control ring that controls the rain loading, so the mechanism itself is 6 [Object of the Invention] An object of the present invention is to solve the problems of the above-mentioned conventional technology and to provide a tape loading device for a magnetic recording/reproducing device that can achieve thinness and high-density recording at the same time. The goal is to provide a mechanism. [Summary of the Invention] In order to achieve this object, the present invention provides a structure in which the connecting portion of the tape guide body of the entry side portion 2, which is movably disposed in the elongated hole provided in the loading ring, is connected by an elastic member such as a spring. The tape guide member 9 side end of the entrance side part 1 of the elongated hole is always urged to come into contact with the tape guide member 9 side, and the tape guide member of the entrance side part 2 exits the opening of the tape cassette and reaches a predetermined loading completion position. The present invention is characterized in that the distance between the entry side section 1 and the second tape guide body is always maintained at the minimum distance during the period of time. [Embodiments of the Invention] An embodiment of the present invention will be described below with reference to the drawings. 1(a) and 1(b) are plan views of essential parts showing an embodiment of a tape loading mechanism in a magnetic recording/reproducing apparatus according to the present invention. FIG. 2 is an entry side portion 1 of the tape loading mechanism shown in FIG. 1. 4 shows the timing of movement of the tape guide body in the inlet side portion 2 and the tape guide body in the entrance side portion 2, and the same reference numerals are given to the members corresponding to those in FIG. In this FIG. 1, 37 is a compression spring disposed in the elongated hole 14 provided in the loading ring 13, 38 is a stopper attached to the protrusion 13A of the loading ring 13 with a set screw 39, and 38a
4θ is a stopper surface that locks the shaft 17, and 4θ is a locking member attached to the loading ring 13 with a set screw 41, and its rod-shaped projection 40a is connected to the compression spring 3.
The compression spring 37 is held in the elongated hole 14 by inserting it into one end of the base 1.
5, which is inserted into the other end of the compression spring 37 and plays the role of holding the compression spring 37 in the elongated hole 14, similar to the rod-shaped projection 40a. I am in charge. Next, a specific loading operation of this embodiment will be explained. FIG. 1(a) shows that the loading 13 is driven in the direction of arrow C, and the tape guide body +1 of the entry side 2 is moved to the positioning member I.
2, a state in the middle of the loading operation when ω=ωJ in FIG. 2 is shown. In this state, the tape guide 11 of the entry side 2 is only in contact with the positioning member 12 but is not pressed against the positioning member 12, and on the other hand, the tape guide 9 of the entry side 1 is not attached to the positioning member 12. 10 (shown in FIG. 1(b)) and has not started to rise.
5 is always biased in the reloading direction (direction of arrow C) by the compression spring 37, so it is pressed against the end of the entrance side 1 of the elongated hole 14 on the tape guide 9 side. The distance between the side portion 1 and the second tape guides 9, 11 is maintained at the shortest distance Qz. From this state, the loading ring 13 is further moved in the direction of arrow C.
When the tape guide 11 of the entry side 2 is rotated in the direction, the compression spring 3 is prevented from moving by the positioning member 12.
7 is compressed, thereby. The base I5 moves relatively within the elongated hole 14 in the direction indicated by the arrow. At this time, the compression spring 3 is
7 buckling is suppressed. and. When the portion of the shaft 17 protruding from the upper surface of the loading ring 13 implanted on the base 15 comes into contact with the end surface 38a of the stopper 38, the compression operation of the compression spring 37 is stopped, and instead, the compression spring lie is compressed. Then, the tape guide body 11 of the entrance side portion 2 is pressed against the positioning member 12. On the other hand, the first tape guide 9 on the entry side starts to rise and reaches the positioning member IO when the shaft 17 abuts on the end surface 38a, and the subsequent loading ring 13
With the rotation of the compression spring 91! is crimped to the positioning member IO. FIG. 1(b) shows the state when this loading operation is completed. In this state, the distance between the entrance side part 1 and the second tape guides 9 and 11 is the longest distance 21, and the above-mentioned deviation in the height position of the magnetic tape on the entrance side of the cylinder 2 is corrected. The necessary distance can be secured. In the loading operation described above, RtlQ between the entry side portion 1 and the second tape guide body 9111 is the second! l
As shown in , Q'' fA z is obtained in the range of ra = 0 to ω at the time of loading. This is.
This means that the loading operation is performed in a state where the distance between the tape cassette 3 and the supply reel 5 is sufficiently small, and the magnetic tape 4 is smoothly pulled out without coming into contact with the L portion end surface of the tape cassette 3 or the supply reel 5. That is, in this case, the movement timing of the entry side section 1 and the second tape guide bodies 9, 11 is appropriate. In the above embodiment, the compression spring lie of the tape guide 11 of the entry side part 2 and the biasing compression spring 37 are configured separately, but the biasing compression spring 37 The crimping spring lie is used to obtain the crimping force of the tape guide 11.
It is also possible to have a configuration in which . Further, the crimping spring 9e of the tape guide body 9 of the entry side part 1 is disposed in a separate elongated hole provided in the loading ring 13,
The tape loading mechanism itself can be made thinner by connecting the tape guide member 9 of the entry side portion 1 and the loading ring 13 via the compression spring 9e. In the above embodiment, the case where two tape guide bodies 9 and 11 are arranged on the inlet side of the cylinder 2 is explained, but the case where two tape guide bodies are arranged on the outlet side of the cylinder 2 is also explained. Even if there is, the present invention can be applied in the same way. [J! [Advantageous Effect] As explained above, according to the present invention, with an extremely simple configuration, loading can be completed with an ideal movement timing to adjust the distance between two tape guides arranged on the same side with respect to the cylinder. It can be easily set to any different size suitable for each state and unloading completion state, and this makes it possible to use ultra-thin magnetic tape with a thickness of about 10 μm and to position the cylinder upright with respect to the chassis. As a result, it is possible to achieve high recording density and thinness of the magnetic recording/reproducing device at the same time, and the remarkable effects of further improving functionality can be obtained.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show an example of the tape loading mechanism 171 in the magnetic recording/reproducing apparatus according to the present invention! FIG. 2 is an explanatory diagram of the movement timing of the tape guide in the tape rope and loading mechanism shown in FIG. 1, and FIG. 3 is a tape loading mechanism in the previously proposed magnetic recording/reproducing device. Plan view of Figure 4(a)
, (b) is a plan view of a main part of the tape loading mechanism shown in FIG. 3. FIG. 5 is a perspective view illustrating the installation state of the cylinder shown in FIG. 3 on the chassis, FIG. 6 is an explanatory diagram regarding the movement timing of the tape guide during tape loading 4114 shown in FIG. 3, and 7th W! J is an explanatory diagram regarding the problem that occurs when the movement timing of the tape loading mechanism shown in No. 31!1 is inappropriate. 1...Chassis, 2...Cylinder, 3
...Tape cassette, 4...Magnetic tape, 8...Opening. 9...Tape guide of entrance tube 1, 9e...
...Connecting member, 11...Tape guide of entrance tube 2, lle...Connecting member, 13...Loading ring, 14...Elongated hole , 15...
...Base, 16.17 ...Shaft, 37
...Compression spring, 38...Stopper. ＋＋：、：；”j' Sai1en (shi) Det 2nd

Claims (1)

[Claims] A first tape guide connected to a loading ring and moved by the rotation of the loading ring, and positioned near the cylinder upon completion of loading, and positioned on the tape reel side with respect to the first tape guide. the first tape guide is directly connected to the loading ring, and the second tape guide is movable within an elongated hole provided in the loading ring. The magnetic tape is connected to the loading ring via an engaging member, and the magnetic tape is pulled out from the tape cassette by these first and second tape guide members and wound around the cylinder at a predetermined angle, and the magnetic tape is released from the cylinder. In the tape loading mechanism of the magnetic recording and reproducing apparatus housed in the tape cassette, a compression spring is embedded in the elongated hole, and the compression spring moves the engaging member to the end of the elongated hole on the side of the first tape guide. maintaining the interval between the first and second tape guides in the narrowest first state until the second tape guide reaches a predetermined loading completion position; After the second tape guide reaches the predetermined loading completion position, the gap between the first and second tape guides is gradually increased by compressing the compression spring, and the first and second tape guides are compressed. When the loading of the tape guide is completed, these first and second tape guides are
1. A tape loading mechanism for a magnetic recording/reproducing apparatus, characterized in that the tape loading mechanism is configured such that the gap between the tape guides is set to the widest second state.