JPH0750048A - Tape loading mechanism - Google Patents

Abstract

PURPOSE:To limit the increase in tape tension within an allowable range and protect the edge of a magnetic tape from a damage by a method wherein the thickness on the type of the tape is detected and, in accordance with the detected result, the transfer speed of tape loading is controlled. CONSTITUTION:When a tape is thin, a tape thickness detecting hole Tc is provided in the bottom plane of a cassette tape enclosure Tb and, when the tape is thick, it is not provided. The tape thickness is detected by judging whether the protrusion 11a of a detector 11 enters the detecting hole Tc or not. The detected result is inputted to a control part 12. In accordance with the inputted result, the control part 12 controls a motor driving circuit 38 and changes the control voltage of a mode control motor 31 to control the transfer speeds of tape loading means 2a and 2b. With this constitution, even if the thicknesses of the magnetic tapes Ta are thin, the increments of the tape tensions produced by the transfer of the loading means 2a and 2b can be limited within the allowable ranges of the respective tapes, so that the buckling of the upper edge of the tape Ta at a flange part for regulating a height can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading mechanism applied to a magnetic recording / reproducing device such as a VTR device.

[0002]

2. Description of the Related Art It is well known that a magnetic recording / reproducing apparatus such as a VTR has a tape loading mechanism for loading / unloading a magnetic tape of a mounted tape cassette.

For example, the VTR device shown in FIG. 4 draws out a magnetic tape Ta of a mounted tape cassette T by a tape loading mechanism and winds it on a rotary drum H equipped with a magnetic head over a predetermined angle range. The magnetic tape Ta is formed and magnetic recording and reproduction are performed. The tape loading mechanism 1 applied to this VTR device uses a loading mechanism 2a, 2b for guiding the magnetic tape Ta by a driving mechanism 3 which will be described later and a loading position (solid line position) for forming a predetermined tape path and an unloading mechanism in the tape cassette T. The magnetic tape Ta is moved between the loading position (chain line position) and the magnetic tape Ta in the loading state and the unloading state.

The drive mechanism 3 is, for example, as shown in a simplified diagram of FIG. 5, a mode control motor 31, a worm gear 32 to which rotational power of the mode control motor 31 is transmitted via a belt, a worm wheel gear 33, and a drive gear 34. , Upper and lower two drive rings 35a, 35
b, slide rings 36a and 36b attached to the drive rings 35a and 35b, loading means 2a and 2b composed of vertical guide rollers having height regulating flanges and inclined poles, and are guided by the guide grooves 36a and 36b. The base 37a, 37b and the drive circuit 38 for driving the mode control motor 31 can be used. By controlling the control voltage sent from the drive circuit 38 to the mode control motor 31, the rotation shaft 31a of the mode control motor 31 can be rotated in the forward and reverse directions. For example, the rotation shaft 31a can be moved in the arrow direction (forward rotation direction). The rotation causes the worm gear 32 and the worm wheel gear 33 to rotate in the arrow direction, the drive ring 35a to rotate clockwise, and the drive ring 35a to rotate counterclockwise via the drive gear 34 to rotate the pole base 37a. , 37b move in the direction of the arrow along the guide grooves 36a, 36b, and the tape loading means 2
a and 2b are displaced from the illustrated unloading position to the loading position (not shown). When it is desired to displace the loading poles 2a and 2b from the loading position to the unloading position, the mode control motor may be reversed.

[0005]

By the way, the recent VT
In the R device, for example, it has been partially proposed to use magnetic tapes having different tape thicknesses and tape types such as iron oxide tape and metal tape in the same device.

However, the conventional tape loading mechanism 3
Then, the moving speed of the tape loading means 2a, 2b is set to one preset speed. When a thin tape such as a metal tape is used in this device, the magnetic tape Ta is guided to the inclined pole or the like due to the increase of the tape tension in the middle of the movement of the tape loading means 2a, 2b (in the middle of loading / unloading). There is a risk that the upper edge of the magnetic tape Ta will buckle at the flange portion of the tape guide and the tape edge will be damaged.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a tape loading means for pulling out a magnetic tape of a mounted tape cassette and a loading position where a drive mechanism forms a predetermined tape path and a tape cassette. In a tape loading mechanism for moving the magnetic tape to an unloading position inside, a detecting means for detecting the thickness or type of the magnetic tape, and a movement of the loading means by the driving mechanism corresponding to a detection result by the detecting means. A tape loading mechanism comprising a moving speed control means for variably controlling the speed; and in such a tape loading mechanism, a tape of a thin magnetic tape with respect to a thick magnetic tape of the magnetic tape. The table is designed to slow down the moving speed of the loading means. And loading mechanism, and in such a tape loading mechanism, there is provided a tape loading mechanism so as to slow down the moving speed of the tape row Dig means metal tape against the iron oxide tape.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a view showing an embodiment of a tape loading mechanism according to the present invention, FIG. 2 is a perspective view showing a tape cassette, and FIG. 3 is a graph showing a moving speed characteristic of a loading pole. The same components as those in the conventional example are designated by the same reference numerals, and detailed description thereof is omitted.

The tape loading mechanism 10 shown in FIG.
In addition to the structure of the tape loading mechanism 1 described in the conventional example, a detector 11 for detecting the thickness or type of the magnetic tape is used.
And a control unit 12 for variably controlling the moving speed of the loading means 2a, 2b by the drive mechanism 3 according to the detection result of the detector 11.

The detector 11 is made up of the tape thickness of the magnetic tape Ta (for example, "thick tape", "thin tape") or tape type (for example, "iron oxide tape", "coated metal tape", "evaporated metal tape". , Etc.) is detected.
Here, iron oxide tape is simply used as "thick tape".
As an example of "thin tape", metal tape is used.

In the tape cassette T shown in FIG. 2, when an iron oxide tape is used as the magnetic tape Ta, the tape thickness detecting hole Tc as shown in the figure is closed on the bottom surface of the cassette housing Tb, and the magnetic tape Ta is a metal tape. If you use
Tape thickness detecting holes Tc are formed in the bottom surface of the cassette housing Tb.

The detector 11 detects the presence / absence of the tape thickness detection hole Tc depending on whether or not the convex portion 11a has entered the tape thickness detection hole Tc. By detecting the presence or absence of the tape thickness detection hole Tc in this way, it is possible to detect whether the magnetic tape Ta is a “thick tape” or a “thin tape”. Needless to say, such detection can be applied to magnetic tapes of the same type but different thicknesses, even if the magnetic tapes of different types are not separately used.

The detection result of the detector 11 is input to the control unit 12. Based on the above detection result, the control unit 12
The moving speed of the tape loading means 2a, 2b by the drive mechanism 3 is controlled. Actually, the control unit 12 uses the drive mechanism 3
The motor drive circuit 38 is controlled to set the moving speed of the tape loading means 2a and 2b as follows.

FIG. 3 shows the speed characteristics until the tape loading means 2a and 2b move from the unloading position to the loading position. As shown in the figure, when the magnetic tape Ta is a "thick tape" (for example, the magnetic tape Ta is an iron oxide tape), the moving speed of the loading poles 2a and 2b is increased to the standard speed Va. Further, as shown in the figure, when the magnetic tape Ta is a "thin tape" (for example, the magnetic tape Ta is a metal tape), the moving speed of the tape loading means 2a, 2b is slower than the standard speed Va described above. Raised to Vb. That is, the technical point is that the moving speed of the tape loading means 2a, 2b is slowed as the thickness of the magnetic tape Ta becomes thinner. The speed characteristics until the loading means 2a and 2b move from the loading position to the unloading position may be the same.

In such a tape loading mechanism 10, since the moving speed of the tape loading means 2a, 2b can be set appropriately corresponding to the thickness of the magnetic tape Ta, the magnetic tape Ta is a "thin tape". Also, the increase in the tape tension when the tape loading means 2a, 2b is moved can be suppressed within the allowable range of each tape, and the upper edge of the magnetic tape Ta is surely buckled at the height regulating flange portion of the tape guide. The tape edge can be prevented from being damaged.

In this embodiment, as shown in FIG. 3, the loading / unloading operation is performed in order to minimize the abrupt increase / decrease of the tape tension at the beginning and end of the loading / unloading operation as shown in FIG. This is preferable because the moving speed is gradually increased and decreased at the initial stage of the operation, but the invention is not limited to this.

In this embodiment, the control unit 12 controls the motor drive circuit 38 to change the control voltage of the mode control motor 31, but the present invention is not limited to this. It is also possible to interpose a switchable reduction gear therein so that the moving speed of the loading poles 2a, 2b can be appropriately changed according to the thickness or type of the magnetic tape a.

In this embodiment, the detector 11 detects the thickness or type of the magnetic tape Ta as to whether or not there is a tape thickness detecting hole Tc in the tape cassette T, and the tape loading means 2a and 2b are detected in accordance with the detection result. Although the two moving speeds are switched and controlled, the present invention is not limited to this. For example, the moving speeds of the tape loading means 2a and 2b are variably controlled in a plurality of stages by subdividing the magnetic tape according to the thickness and type of the magnetic tape. However, each may be set appropriately.

Further, in the present embodiment, the thickness or type of the magnetic tape Ta is detected by the presence or absence of the tape thickness detection hole Tc of the tape cassette T. For example, the magnetic tape Ta is used.
Alternatively, the detection may be performed based on the characteristics of the reflected wave of the light radiated to the.

In the loading mechanism 10 of this embodiment, the driving mechanism 3 uses the loading rings (drive rings 35a and 35b), but for example, the driving mechanism uses a pair of left and right loading arms. However, it goes without saying that the present invention can be applied.

[0022]

According to the tape loading mechanism of the present invention,
Even if the thickness or type of magnetic tape is different,
Since the moving speed of the loading pole can be set appropriately for each, even if magnetic tapes with different tape thicknesses and tape types are used in the same device, the increase in tape tension when moving the tape loading means is within the allowable range for each tape. Therefore, there is an effect that it is possible to prevent the tape edge from being damaged at the height regulating flange portion of the tape guide.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a tape loading mechanism of the present invention.

FIG. 2 is a perspective view showing a tape cassette.

FIG. 3 is a graph showing a moving speed characteristic of a loading pole.

[Explanation of symbols]

 2a, 2b Loading pole 3 Drive mechanism 10 Tape loading mechanism 11 Tape thickness detector (detection means) 12 Controller (moving speed control means) T Tape cassette Ta Magnetic tape

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[Procedure amendment]

[Submission date] March 1, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a tape loading mechanism of the present invention.

FIG. 2 is a perspective view showing a tape cassette.

FIG. 3 is a graph showing a moving speed characteristic of a loading pole.

FIG. 4 is a plan view showing a general VTR device.

FIG. 5 is a diagram showing a conventional tape loading mechanism.

[Explanation of Codes] 2a, 2b Loading pole 3 Drive mechanism 10 Tape loading mechanism 11 Tape thickness detector (detection means) 12 Controller (moving speed control means) T Tape cassette Ta Magnetic tape

Claims (3)

[Claims] 1. A tape loading mechanism for moving a tape loading means for pulling out a magnetic tape of a mounted tape cassette between a loading position for forming a predetermined tape path and an unloading position in the tape cassette by a drive mechanism, A magnetic tape, and a moving speed control means for variably controlling the moving speed of the loading means by the driving mechanism in accordance with the detection result of the detecting means. Tape loading mechanism. 2. The tape loading mechanism according to claim 1, wherein the moving speed of the tape loading means for the thin magnetic tape is slower than that for the thick magnetic tape. 3. The tape loading mechanism according to claim 1, wherein the moving speed of the tape loading means for the metal tape is slower than that of the iron oxide tape.