JPS6035364A - Tape loading device - Google Patents

Abstract

PURPOSE:To maintain the height precision of a tape guide at the final position of loading without any secular change in the height direction of a guide block by making the relation between the contact surfaces of the guide block and guide rail different on the way of loading from the relation at the final position. CONSTITUTION:A surface 23 to be slided and a reference surface 24 to be positioned of the guide block 2 are formed in steps, a sliding surface 28 is formed on the top surface of a rail part 12, and a positioning reference surface 30 is formed on the top surface of a positioning block 14. When the rail part 12 is connected to the block 14, the reference surface 30 has a difference in level from the sliding surface 28. Consequently, when the guide block 2 slides on the rail part 12 in the middle of loading, it slides on the sliding surface 23. At this time, the surface 24 is separated from the sliding surface 28 and not forced to rub. Further, the guide block 2 is positioned at the final position of loading between the reference surface 30 and the surface 24 of the block 2. The reference surface 30 is not rubbed in the middle of loading, so the positioning is performed accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is a tape loading device that is most suitable for application to a magnetic recording/reproducing device such as a cassette video tape recorder. This relates to a tape loading device that loads the tape onto the surface of a rotating head drum using a sliding cheese guide block.

[Background Art and Seven Problems] A tape loading device applied to a magnetic recording/reproducing device such as a cassette video tape recorder, that is, a tape loading device that pulls out a magnetic tape (hereinafter simply referred to as tape) from within a tape cassette using a tape guide. In a tape loading device that wraps the tape around a head drum (simply referred to as drum below) for one rotation, the guide block to which the tape guide is attached is guided by a guide rail and positioned at the final position of loading. format is commonly used.

Therefore, a conventional example of this type of tape loading device will be explained based on FIGS. 1 to 3. In addition, in this conventional example, the tape (5) is pulled out from inside the tape cassette (4) installed by a pair of guide blocks +21 (31) that are moved along both sides of the drum (
It is loaded so that it wraps around the moon's surface in a predetermined spiral and, depending on the wrapping angle of nearly 360 degrees, in a solo manner.

First, on the pair of guide blocks t2r tat is a tape guide (6) consisting of a fixed bottle called a neck tightening guide.
A pair of tape guides (7+t
The three tape guides with 8J are installed in a triangular arrangement. Next, the drum fi+ is arranged vertically on the mechanical board (9), and a pair of guide rails (101 [111] for guiding both guide blocks +21 (31), respectively) are arranged on both sides of the drum fi+. These two guide rails au+uu are curved band-shaped plates along the circumferential surface of the drum fi+ and are arranged in a y-symmetrical manner.The two guide rails Uω■ have a rail part q pasted and a rail part q attached to each of these rail parts. (L21 (131) is formed with a positioning block (+41 (151) connected at the tip thereof, and a guide groove (161) is formed along the center of these. has a pair of guide bins (171) fixed to its lower surface with a gap between them.
aa+ is placed on both guide rails α01 (111) with aa+ inserted into each guide groove aυ. Therefore, both guide rails αυ) are guided by both guide blocks +21 (31 is both guides #u6). Slide on αD,
It is configured to be able to reciprocate along both sides of the drum (1) between a backward movement position shown in phantom lines in FIG. 2 and a forward movement position shown in solid lines. In addition, both guide blocks +21 +31
The reciprocating motion is performed by a moving mechanism (none of which is shown) consisting of a ring gear, a connecting link, etc.

Therefore, when both guide blocks +21 (31) are returned to the return position, these tape guides (6)
(7) (8) is the tape (51) in the tape cassette (4).
Both guide blocks + 21 are of the same height as the reeds.
(When the tape guide 31 is moved forward to the forward position, the force (8) of these tape guides (6) has a height difference in the vertical direction relative to the drum (1). However, in this forward position, the temperature is guide block + 21 tape guides [61
(7 bar 8) is lowered to a position lower than the height position of the tape 15 in the tape cassette 14+, and the other guide block (31 tape guide f6+ +71 t8J) Therefore, both guide trays/l' (
5 of IIJ ul+, one (1 (ll) is inclined downward by 1 from the backward movement position to the forward movement position with respect to the horizontal plane, and the other αD is inclined downward by 1 from the backward movement position to the forward movement position with respect to the horizontal plane. It is tilted upward in the forward movement position.However, both of these guide rails (1 and αV are drum 1.
The tape lead (1a) has an inclination along the helical angle of the tape lead (1a) provided on the circumferential surface of the tape lead (1a).

According to the tape loading device configured as described above, first, as shown by the imaginary lines in FIG. The tape (5) is relatively inserted into the inside of the tape (5) in the cassette (4).Next, following the installation of the tape cassette (4), at -C, both guide blocks +21 (3) are moved into both guide grooves by the moving mechanism. ae
While being guided by the guide rails 11ω, it slides on the circles of both guide rails 11ω and starts forward movement (sliding movement) from the backward movement position in the directions shown by arrows a and b. And both guide blocks +21 (3
) each tape guide +67 (7) (8) is the tape (
Lock 51 and use the tape (5) as a tape guide)
In front of +41, it is gradually pulled out to both sides of the drum tlJ. However, at the time of levering, one guide block (21) gradually descends due to the downward side pressure against the horizontal plane as the one guide rail (101) inclines, and the other guide block (3) gradually descends due to the inclination of the other guide rail circle. As a result, it is gradually raised upward relative to the horizontal plane.

The tape (5) pulled out by these guide blocks +21 to +31 is gradually loaded (wound) onto the surface of the drum (1) in a solo manner. Moreover, at this time, since the inclination of both guide rails tlUluυ is along the helical angle of the tape lead a) of the drum (1), each tape guide (6 bar 7J (87 is the tape lead C1a) of the 1 guide block +21 +31)
) is moved forward along the ideal movement trajectory along the helical angle of line (4), so that the tape (5) is ideally moved along its tape lead (1a) to the phase of drum +11. It will be loaded and go.

However, 1-car guide block + 2J f3J is in the final stage of loading, which is the forward movement position, and both guide rails u (
1) Move from the rail part (121tli) of ■ onto both positioning blocks u41 [1■. Then move the pair of positioning bins (19) fixed on both positioning blocks (141 (151), and move each guide block (2) to Q. (3) are engaged with each other, and both guide blocks (2) and (3) are stopped at the final position of loading.Then, both guide blocks +21 [31] By placing the tape on the positioning block (14+t151), each tape guide +61 [7] is positioned in the height direction of t8+, and the tape (5) is placed on the drum (1) and its tape lead (1aJ). In a spiral state and 3
A winding angle of nearly 600 completes loading in a yΩ shape. Note that unloading of the tape (51) is performed by the reverse operation of the loading process described above.

However, the conventional tape loading apparatus constructed and operated as described above has the following problems. In addition, here both guide blocks + 21 [38 guide rails f101ul1, etc., only one of them
A, but the other one is exactly the same except for the inclination of the guide rail.

That is, as mentioned above, the guide block +21 always moves over a long distance on the rail @1121 of the guide rail when loading and unloading, due to the opening between the backward movement position and the forward movement position, which is the final loading position. It will be slid across. For this reason, the guide block (2
) is constantly rubbed against the upper surface of the rail portion [12+], causing wear 7, and the lower surface of the guide block +21 is worn out. When considering the change over time when the sliding of the guide block (2) is repeated, it is assumed that the guide block (2) is placed on the positioning block 0.41 of the guide rail (1 (11) and positioned. Even in the state, each tape guide (6 bars 7J [8
5 problems occurred when it became difficult to maintain the sheath level of the height H of 1. In addition, each tape guide (6+) of the guide block 12)
+71 (The accuracy of height H at 81 is incorrect (then,
It is said that winding the tape (51) around the drum tl+ will deteriorate the condition of this type of tape loading device.
is a serious defect.

f guide block (21 for accurate positioning at the final position of loading, and guide rail t101)
Because the guide rail uUI has to be arranged at an angle with respect to the Y horizontal plane, it has conventionally been necessary to install the guide rail uUI in two parts: the rail part and the positioning block circle. For this reason, the guide groove (I6) of the guide rail is also divided into two, and the guide groove (I6), especially the connection part (seam) (16
There was a problem that the machining accuracy and assembly accuracy of aJ deteriorated.

Due to poor accuracy, the temperature of the guide block (21 and guide bin) may be incorrect at the connecting part (16a).
There was a defect that the guide block (2) did not provide smooth guidance, such as being easily pulled.

[Object of the Invention] The present invention aims to provide a team loading device that can solve the above-mentioned problems.

Summary of the Invention The present invention provides the above-mentioned tape loading device, which includes:
A sliding surface for sliding the guide block and a positioning reference surface for positioning the guide block at the final position of loading are provided on the guide rail with a step difference between them, The guide block has a sliding surface that slides on the sliding surface and a positioning reference surface that is placed and positioned on the positioning reference surface with a step difference between them. During the loading of the guide block, the reference surface to be positioned is maintained at a distance of 100 degrees from the sliding surface, and at the final position of the loading, the sliding surface is kept at a distance of 100° from the sliding surface. At the same time, the reference surface to be positioned is placed on the positioning reference surface for positioning, and even when the guide block is repeatedly slid, the change in the height direction over time is prevented. The height accuracy of the tape guide at the final loading position can be maintained extremely reliably. Furthermore, there is no need to divide the guide groove of the guide rail, and the machining accuracy and assembly accuracy of the guide groove can be improved.

〔Example〕

An embodiment of the present invention applied to a tape loading device for a Vcassette video tape recorder will be described below with reference to FIGS. 4 to 11. Note that the same reference numerals are given to the same structural parts as in FIGS. 1 to 3, and the explanation 8A thereof will be omitted. Further, although only one of the two guide blocks +21 +31 and the two guide rails uO1uυ will be explained here, the other is completely the same except for the inclination of the guide rail.

First, as shown in FIGS. 7 and 8, the lower surface of the guide block +21 has a sliding surface (c) in the center, and a sliding surface (c) at the inner and outer sides of the sliding surface (c). The reference surface c241 is provided with a step-like step. Further, as shown in FIG. 6, a tapered surface (c) is formed at the front end of the positioning reference surface a.

On the other hand, as shown in FIG. 4, the guide rail (101 is formed by a rail part and a positioning block circle connected at the tip of the rail part [121]).

The tip of the rail portion σ2 is provided with a U-shaped convex portion η, and a guide groove aQ along the center portion of the rail portion (121) is formed to extend into the convex portion η.

Therefore, the guide groove is completely formed on the rail portion u side. In the present invention, the upper surface of the rail portion α2 is referred to as the sliding surface (5).
C) is formed. Also, the positioning block (141
A convex portion (2η) of the rail portion [121 is fitted into a sled-shaped concave portion □□□.The upper surface of the positioning block aΦ is formed into a positioning reference base mark in the present invention. Note that a tapered surface 011 is formed at the rear end of the positioning reference surface (to), which is the connection portion side with the rail portion aδ.

Next, as shown in FIG. 5, the rail part σ2 and the positioning block aψ are connected with the rail part (the convex part c7) fitted into the concave part (the two holes) of the positioning block circle. Then, in the same way as described above, the guide block +21's guide bin (lη bet is guided by the guide groove a6+, guide block +21 is guided by the guide rail σ0) upper bin b-j
Ru.

However, as shown in FIG. 6, when the rail part a2 and the positioning block
The positioning reference surface (to) of 4J has a height difference with respect to the sliding surface (2~) of rail part +121.The guide rail (101) formed by this sliding surface 4 and positioning reference surface (2) The step h1 is the guide block +21
The step between the sliding surface (c) and the positioning reference surface (to) is formed to be thicker (h,>h).

The tape loading device of the present invention is configured as described above. Then, as described above, the guide block (2
) is reciprocated on the guide rail 10).

According to the present invention, however, the contact surfaces are completely different (the contact state is can be switched.

] It turns out.

That is, as shown in FIGS. 6 and 7, the guide block +
21 is sliding on the rail part (IX!1) during loading, the sliding surface (C) of the guide block +21 is sliding on the sliding surface (C) of the rail part (121). At this time, since the positioning reference surface (to) of the guide block (21) has a step with respect to the sliding surface, the positioning reference surface (to) corresponds to the rail part a. It is maintained in a spaced state between the sliding surfaces of.

Therefore, the positioning reference surface (2) of guide block +21
However, there is no possibility that the sliding surface (c) of the rail part (c) will cause any wear.

Next, as shown in Figures 6 and 8, guide blocks (
2) The guide rail screams at the final stage of loading! Move onto the positioning block ■ from u (121).

When the guide block +21 is positioned by the positioning block σ4) at the final loading position, the positioning reference surface (2) of the guide block +21 is
The slope is placed on the positioning reference surface gloss of the positioning block (■). At this time, the difference in level between the sliding surface of the guide rail 0@ and the positioning reference surface f3t)l is the difference in level between the sliding surface (c) of the guide block (2) and the positioning reference surface (to). This is because it is thicker and thicker.

The sliding surface of the guide block +21 is separated from the sliding surface of the rail part [121 (separated from the dual role) by the difference in level (h + h*) between them.

will be done. Therefore, the positioning of guide block +21 at the final loading position is 0”)
The positioning is performed between the positioning reference plane part of Q4) and the positioning reference plane (to) of the guide block (2). The positioning reference surface (■) of the guide block [21] will be worn out during loading, and the sliding on the positioning reference surface (C+Ot) at the final stage of loading is also very slight. ) is precisely positioned on the positioning block side. And even if the guide block (2) slides repeatedly,
Changes over time in the height direction of the guide block (2) at the final stage of loading (for each tape guy at the final position of loading) +61 +77 +81 K To maintain the accuracy of the height H extremely reliably. I can do it.

In addition, when the guide block (2) moves from the rail part (1"lJ to the positioning block side), the guide block (2)
The tapered surface (c) provided at the front end of the positioning reference surface (to) in 2) is the positioning reference surface on the 1 positioning block side ■
Since the guide block +21 is guided by the tapered surface 61 provided at the rear end, the above-mentioned transfer of the guide block +21 is performed extremely smoothly. Also, at the final loading position τ,
The sliding surface (C) of the guide block (2) is separated from the sliding surface of the rail portions σ in the concave portion of the positioning block I.

Further, according to the present invention, at the final loading position, the guide block +21 is positioned on the positioning reference surface (G) on the positioning block side, which is completely different from the sliding surface of the rail portion (12). It becomes possible to extend and fit the rail part a21w of the rail (10j) toward the positioning block side, and it is possible to completely form the guide groove (16) on the female side of the rail part.For this reason, the guide inlet 6) The processing accuracy and assembly accuracy have been improved, and it has become possible to guide the guide block (2) with zero guide pins extremely smoothly.

As described above, in the present invention, the relationship between the contact surfaces between the guide block (21 and the guide rail LIO1) is completely separated during sliding and during positioning.The relationship between the contact surfaces is as described above. In addition, as shown in FIGS. 9 to 11, various modifications are possible in the arrangement of each contact surface and the relationship between the steps. In addition, the sliding surface of the guide block +21 in FIGS. 9 to 11 ( c) and positioning reference surface (to)
, the sliding surface of the rail rib (c), the positioning reference base stamp on the positioning block side, etc. are given the same symbols as in Fig. 8.
In both cases, the step h1 of the guide rail σ is thicker than the step of the guide block (21) (hl>h
R) is formed.

[Application example]

The tie loading device of the present invention is not limited to the Ω method of wrapping the tape at a winding angle of 360° on the surface of the tape +51 y drum +I+ as shown in the embodiment, but can also be applied to tapes with various winding angles. Applicable to loading devices.

Further, the present invention can be widely applied to various tape loading devices other than magnetic recording/reproducing devices such as cassette video tape recorders.

[Young fruit of invention]

As described above, the present invention has a step on the guide rail between the sliding surface for sliding the guide block and the positioning reference surface for positioning the guide block at the final loading position. Set it up in a tight condition,
The enclosed guide block is provided with a sliding surface that slides on the sliding surface and a positioning reference surface that is placed on the positioning reference surface and positioned with a difference in level from each other. It is something. During loading, the positioning reference surface of the guide block is held apart from the sliding surface of the guide rail, and at the final loading position, the sliding surface of the guide block is kept relative to the sliding surface. 5, the reference surface to be positioned is placed on the positioning reference surface for positioning.

Therefore, according to the present invention, the relationship between the contact surfaces between the guide block and the guide rail is completely different (the contact state is cut) during loading and at the final loading position, and the guide block is covered with Since the positioning reference surface is not forced to wear by the guide rail during loading, there is no change in height over time even if the guide block slides repeatedly.
The height accuracy of the tape guide at the final position of loading can be maintained very reliably. In addition, the tape can be wound around the drum with extremely high precision at all times.

Furthermore, since the guide block is positioned at the final loading position on a positioning surface different from the sliding surface of the guide rail, there is no need to divide the guide groove of the guide rail. Therefore, the machining accuracy and assembly accuracy of the guide groove are improved, and the guiding of the guide block is extremely smooth.
be able to.

[Brief explanation of the drawing]

1 to 3 show conventional examples of tape loading devices for cassette video tape recorders,
Figure 1 is a perspective view of the whole, Figure 2 is a plan view of the second part, and Figure 3 is a perspective view of the whole.
The figure is a side view of the main parts of the guide rail shown in cross section along the guide groove. 4 to 11 show an embodiment of a tape loading device for a cassette video tape recorder to which the present invention is applied, in which FIG. 4 is an exploded perspective view of the main parts, and FIG. A perspective view of an assembled state. Figure 6 is a side view showing the guide rail in section along the guide groove, Figure 7 is a cross-sectional view taken along the line ■-■ in Figure 6, and Figure 8 is a cross-sectional view taken along the line ■-■ in Figure 6. FIG. Moreover, FIGS. 9 to 11 are cross-sectional views similar to FIG. 8 in modified examples. In addition, the symbols used in the drawings are °C, [11...
...Rotating head drum +21 [31...
...Guide block (5)...Magnetic tape +61 (71 (81...Tape guide U)
U+Uυ・・・・・・Guide rail・・・・・・
・・・・Extraction surface (241・・・・・・・Positioned reference surface 08+
・・・・・・・・・Sliding surface t3Gl・・・・・・・・・Positioning proximal surface. Agents: Katsutsune Ueya, Yoshi Kamo, Toshiki Osugi Ura

Claims (1)

[Claims] In a tape loading device that loads a tape onto a surface of a rotating head drum using a guide block that slides on a guide rail, the guide rail includes a sliding surface for sliding the guide block. and a positioning reference surface for positioning the guide block at the final loading position are provided with a step difference between them. The guide block has a sliding surface that is slid on the sliding surface and a positioning reference surface that is placed and positioned on the positioning reference surface with a step difference between them. During the loading of the guide block, the positioning surface is kept separated from the sliding surface, and at the final position of the loading, the sliding surface is separated from the sliding surface. A tape loading device characterized in that the positioning reference surface is placed on the positioning reference surface and positioned.