JP3079365U - Tape loading device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent an extra load from being applied to a mode lever in a loading completed state without adding extra parts, thereby being inexpensive, excellent in mode switching performance, and more stable by a loading pin. Provided is a tape loading device exhibiting a tape running guide function. SOLUTION: Loading arm 12 of swing arm 1
And the intermediate link 14 are urged in opposite directions by the elasticity of the spring body 42. The connecting portion of the intermediate link 14 to the loading arm 12 can be displaced in a direction along the line of force of the spring body 42. Gear part 11 of swing arm 1
The mode gear 6 meshes with the rack gear 71 of the mode lever 7. The support shaft 15 supporting the gear portion 11 is arranged on an extension of the line of force of the spring body 42.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a tape loading device to be mounted on a video tape recorder (hereinafter, referred to as a VTR).

[0002]

[Prior art]

 Japanese Patent Application Laid-Open No. 6-119692 relates to a tape loading device assembled to a VTR, in which a cam gear is used to perform a tape loading operation, and the position of a loading pin in a loading completed state is regulated by another urging means different from the cam gear. A description of a technology that reduces the load applied to the cam gear after loading is completed by using the cam gear to complete the transition to another mode by rotating the cam gear. There is.

FIG. 3 shows a conventional tape loading device. The tape loading device will be described below.

[0004] Reference numeral 1 denotes a first swing arm, 2 denotes a second swing arm, and these swing arms 1 and 2 include loading arms 12 and 22 having gear portions 11 and 21 at their bases, and a chassis 3 The guide grooves 31 and 32 guide the sliders 13 and 23, and the loading arms 12 and 22 and the intermediate links 14 and 24 connecting the sliders 13 and 23. I have. The gear portions 11 and 21 of the first swing arm 1 are divided into concentrically arranged small-diameter gear portions 11a and large-diameter gear portions 11b. It is in mesh with the gear portion 21. The respective gear portions 11 and 21 are supported by the chassis 3 via support shafts 15 and 25 so as to be rotatable at fixed positions.

The sliders 13, 23 are provided with loading pins 16, 26, and the sliders 13, 23 and the tips of the intermediate links 14, 24 are relatively fixed by using mounting pins 17, 27. They are swingably connected. Locking pins 41, 51 and spring bodies 42, 52 made of coil springs are used to connect the distal ends of the loading arms 12, 22 and the base ends of the intermediate links 14, 24. That is, the locking pins 41, 51 are fitted into the elongated holes 43, 53 formed in the loading arms 12, 22, and the locking pins 41, 51 and the loading arms 12, 22 are provided. The spring bodies 42 and 52 are interposed between the spring members (not shown in the figure). The long holes 43 and 53 have a shape that is long in the longitudinal direction of the loading arms 12 and 22.

A mode gear 6 is provided rotatably in mesh with the small-diameter gear portion 11 a forming the gear portion 11 of the first swing arm 1. That is, the small-diameter gear portion 11a has a tooth row portion 18 and a missing tooth portion 19 adjacent to the tooth row portion 18, whereas the mode gear 6 also has a tooth row portion 61 and this tooth portion. A toothless portion 62 adjacent to the row portion 61 is provided. In the tape loading mode and the tape unloading mode, the toothed portions 18 and 61 of the small-diameter gear portion 11a and the mode gear 6 mesh with each other, When the tape loading is completed, the small-diameter gear portion 11a and the toothless portions 19 and 62 of the mode gear 6 face each other.

The mode gear 7 rotates by meshing with a rack 71 provided on the mode lever 7. The mode lever 7 is reciprocated on a straight path with forward and reverse rotation of a gear 8 which is rotationally driven by a driving motor (not shown). It has a cam section 81 for realizing various modes such as reverse rapid traverse.

FIG. 3 shows a completed loading state in which first and second swing arms 1 and 2 are extended and sliders 13 and 14 are arranged on both sides of a rotating drum 9 having a built-in magnetic head. In this state, modes such as recording, playback, and forward / backward fast forward are executed. Then, in such a loading completed state, the tape (not shown) wound around the rotating drum 9 is also wound around the loading pins 16, 26, and the loading pins 16, 26. Guides the tape running in the fixed position. The positions of the loading pins 16 and 26 (positions shown) at this time are the loading positions. On the other hand, when the cassette accommodating the tape is deployed (inserted) at the initial setting position, the loading pins 16 and 26 are located at the initial position facing the tape of the cassette disposed at the initial setting position. . The initial position corresponds to the position of the base of the guide grooves 31 and 32. When the loading pins 16 and 26 are located at the initial position, the first and second swing arms 1 and 2 are moved. Has a folded shape (not shown). The loading operation in which the loading pins 16 and 26 protrude from the initial position to the loading position, and the unloading operation in which the loading pins 16 and 26 retreat from the loading position to the initial position are performed by moving the mode lever 7 on a straight path, by the mode gear. 6, the rotation of the gear portion 11 of the first swing arm 12, the rotation of the gear portion 21 of the second swing arm 22, and the like.

In the conventional tape loading device, the spring bodies 42 and 52 incorporated in the first and second swing arms 1 and 2 connect the loading arms 12 and 22 with the intermediate links 14 and 24. Parts are urged in opposite directions. When the loading pins 16 and 26 are moving to the loading position as shown in FIG. 3, the eccentric portions of the gear portions 11 and 21 of the swing arms 12 and 22 are separated from the spring body 42 as seen in FIG. , 52 (a line that coincides with the axis of the spring bodies 42, 52: a one-dot chain line).

[0010]

[Problems to be solved by the invention]

 By the way, when the loading pins 16 and 26 are moved to the loading position as described above, the eccentric portions of the gear portions 11 and 21 of the swing arms 12 and 22 are aligned with the force lines F1 of the spring bodies 42 and 52. , F2, the rotational force of the springs 42, 52 is applied to the gear portions 11, 21 after the loading is completed. Therefore, the mode gear 6 is in a state where a rotational force is applied.

However, in such a state, an extra load corresponding to the rotational force applied to the mode gear 6 is applied to the mode lever 7. Therefore, there is a possibility that the mode lever 7 may not be smoothly moved when the mode lever 7 is moved to shift to each mode such as recording, reproduction, forward / reverse fast forward after loading is completed. Further, if the mode gear 6 is slightly rotated by the rotational force applied to the mode gear 6, the urging force of the spring bodies 42, 52 is changed correspondingly, so that the tape running guide action by the loading pins 16, 26 is impaired. There was a problem.

The present invention has been made in view of the above circumstances, and is intended to prevent an extra load from being applied to a mode switching member such as a mode lever in a loading completed state without adding extra parts. Accordingly, it is an object of the present invention to provide a tape loading device which is inexpensive, has excellent mode switching performance, and exhibits a stable tape running guide action by a loading pin.

[0013]

[Means for Solving the Problems]

 A tape loading device according to the present invention includes a slider having a loading pin which is moved between an initial position facing a tape of a cassette provided at an initial setting position and a loading position at which the tape is wound around a rotary drum. And a loading arm having a gear portion at the base portion are connected via an intermediate link. The loading arm and the intermediate link are urged in opposite directions by the elasticity of the spring body. The connecting portion has a pair of middle bending link members that can be displaced in a direction along the force line of the spring body, and the first rocking arm and a second swing arm different from this are provided by these middle bending link members. Two swing arms are formed, and the gear portions of the first and second swing arms are meshed with each other. According to this, the operation of the first oscillating arm and the operation of the second oscillating arm are synchronized by the meshing rotation of the gear portions.

In the present invention, a mode gear that meshes and rotates with the rack portion of the mode lever that is reciprocated on a straight path is provided so as to mesh and rotate, corresponding to the gear portion of the first swing arm. Therefore, when the rack portion meshes with the mode gear by the movement of the mode lever, the mode gear rotates. When the mode gear rotates and the mode gear meshes with the gear portion of the first swing arm, the first swing arm swings. .

In the present invention, the gear portion of the first swing arm is rotatably supported on the base member via the support shaft at a fixed position, and the support shaft is connected to the spring body of the first swing arm. It is located on the extension of the force line. With this configuration, the biasing force of the spring body is received by the support shaft supporting the gear portion of the first swing arm, and no extra rotational force is applied to the gear portion. Therefore, no extra torque is applied to the mode gear.

In the present invention, in each of the first and second swing arms, a locking pin provided at the connecting portion of the intermediate link is formed at the tip of the loading arm and extends in the longitudinal direction of the loading arm. The spring body, which is fitted in a long slot and is a coil spring, is interposed between the locking pin and a spring receiving portion provided on the loading arm.

In the present invention, when the loading pin of each of the first and second swing arms is moving to the loading position, it engages with the teeth of the gear portion of the second swing arm. A projection for preventing rotation of the gear portions of the first and second swing arms is provided on the gear portion of the first swing arm. With this configuration, the first and second swing arms are reliably positioned.

In the present invention, when the loading pin of each of the first and second swing arms is moving to the loading position, the support shaft of the first swing arm is moved to the second swing arm. And the engagement portion between the protrusion and the tooth portion of the gear portion of the second swing arm is located on the extension line of the force line of the spring body of the second swing arm. Is located on an extension of the line of force of the spring body. This also allows the biasing force of the spring body to be received by the support shaft supporting the gear portion of the first swing arm, and furthermore, no extra rotational force is applied to the gear portion. Therefore, no extra rotational force is applied to the mode gear.

[0019]

[Embodiment of the invention]

 FIG. 1 is a schematic configuration diagram of a tape loading device according to the present invention, and FIG. 2 is a cross-sectional view showing a connection structure between a first loading arm 12 and a connection portion of an intermediate link 14.

In this embodiment, the point different from the conventional example described with reference to FIG. 3 is that the support shaft 15 supporting the gear portion 11 of the first swing arm 1 is provided with a spring body 42 of the first swing arm 1. This is a point arranged on the extension of the line of force F1. With this configuration, the biasing force of the spring body 42 is received by the support shaft 15 that supports the gear portion 11 of the first swing arm 1, and no extra rotational force is applied to the gear portion 11. . Therefore, no extra force is applied to the mode gear 6 and the mode lever 7, so that the mode lever 7 can be smoothly and smoothly moved to each mode such as recording, playback, and forward / reverse forward after loading is completed. Become like In addition, since the mode gear 6 does not rotate unexpectedly after loading is completed, the urging force of the spring body 42 is stabilized, and the tape running guide action of the loading pins 16 and 26 is also stabilized.

When the loading pins 16 and 26 of the first and second swing arms 1 and 2 are moving to the loading position, the support shaft 15 of the first swing arm 1 is moved to the second position. The point that the swing arm 2 is located on the extension of the force line F2 of the spring body 52 is also different from the conventional example described with reference to FIG. With this configuration, the movement of the mode lever 7 is smoothly and smoothly performed, and the tape running guide action by the loading pins 16 and 26 is also stabilized. The other items are the same as those described with reference to FIG. 3, and therefore, the same or corresponding portions will be denoted by the same reference characters and detailed description will be omitted to avoid redundant description. In this embodiment, when the loading pins 16 and 26 of the first and second swing arms 1 and 2 are moving to the loading position, the teeth 21a of the gear portion 21 of the second swing arm 2 are moved. The gear portion 11 of the first swing arm 1 is provided with a projection 10 that engages with the first swing arm 1 to prevent the gear portions 11 and 21 of the first and second swing arms 1 and 2 from rotating. With this configuration, the above-mentioned operation, that is, the movement of the mode lever 7 is smoothly and smoothly performed, and the operation of guiding the tape traveling by the loading pins 16 and 26 is more stably exhibited. Is done.

[0022]

[Effect of the invention]

 As described above, according to the present invention, no extra load is applied to the mode switching member such as the mode lever in the loading completed state, so that the mode switching performance by moving the mode switching member is excellent, and the loading pin is more stable. The tape running guide function is exhibited. In addition, according to the present invention, it is not necessary to add an extra part, so that it is possible to provide a tape loading device which is excellent in the mode switching performance and the tape running guide effect by the loading pin as described above.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a tape loading device according to the present invention.

FIG. 2 is a cross-sectional view showing a connection structure between a first loading arm and a connection portion of an intermediate link.

FIG. 3 is a schematic configuration diagram of a tape loading device as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st swing arm 2 2nd swing arm 6 Mode gear 7 Mode lever (mode switching member) 9 Rotary drum 10 Projection 11,21 Gear part 12,22 Loading arm 13,23 Slider 14,24 Intermediate link 15 Support shaft 16 , 26 Loading pin 21a Tooth 41,51 Locking pin 42,52 Spring body 43,53 Slot F1, F2 Line of force of spring body 71 Rack part (tooth row part)

Claims (6)

[Utility model registration claims] 1. A slider provided with a loading pin which is moved back and forth between an initial position facing a tape of a cassette provided at an initial setting position and a loading position where the tape is wound around a rotary drum, and a gear portion at a base portion. Is connected via an intermediate link, the loading arm and the intermediate link are urged in opposite directions by the elasticity of the spring body, and the connecting portion of the intermediate link to the loading arm is connected to the spring body. And a pair of middle bending link members that can be displaced in the direction along the line of force. The first bending arm and a second swing arm different from this are formed by these middle bending link members. And the gear portions of the first and second swing arms are meshed with each other, and a straight line is formed corresponding to the gear portion of the first swing arm. A mode gear that meshes and rotates with the rack portion of the mode lever that is reciprocated is provided so as to be meshable and rotatable, and the gear portion of the first swing arm is rotatably supported by the base member via a support shaft at a fixed position. And the support shaft is disposed on an extension of the line of force of the spring body of the first swing arm, and is provided at the connecting portion of the intermediate link in each of the first and second swing arms. A locking pin is formed at the distal end of the loading arm and is fitted into a long hole in the longitudinal direction of the loading arm. When the loading pin of each of the first and second swing arms is moved to the loading position, the body is interposed with the teeth of the gear portion of the second swing arm and the first swing arm is engaged with the first swing arm. And the first A projection for preventing the rotation of the gear portion of each of the two swing arms is provided on the gear portion of the first swing arm, and the loading pins of the first and second swing arms move to the loading position. And the support shaft of the first swing arm is located on an extension of the line of force of the spring body of the second swing arm, and the protrusion and the second swing arm A tape loading device, wherein an engagement portion of the gear portion with a tooth portion is located on an extension of a line of force of the spring body of the second swing arm. 2. A slider provided with a loading pin which is moved back and forth between an initial position facing a tape of a cassette provided at an initial setting position and a loading position where the tape is wound around a rotary drum, and a gear portion at a base portion. Is connected via an intermediate link, the loading arm and the intermediate link are urged in opposite directions by the elasticity of the spring body, and the connecting portion of the intermediate link to the loading arm is connected to the force line of the spring body. A mode-gear link member that can be displaced in a direction along with a mode gear that meshes and rotates with the tooth row portion of the mode switching member corresponding to the gear portion, and the gear portion serves as a support shaft. And the support shaft is disposed on an extension of the line of force of the spring body. Tape loading apparatus according to. 3. A locking pin provided at a connecting portion of the intermediate link is formed at a distal end of the loading arm and is fitted into a long hole in the longitudinal direction of the loading arm, and is provided on the locking pin and the loading arm. 3. The tape loading device according to claim 2, wherein said spring body made of a coil spring is interposed between said spring receiving portion and said spring receiving portion. 4. A pair of the center bending link members, which form a first swing arm and a second swing arm other than the first bending arm, and a first and a second swing arm. When the gear portions of the second swing arms are meshed with each other and the loading pin of the second swing arm is moving to the loading position, the support shaft of the first swing arm is 4. The tape loading device according to claim 2, wherein the two swing arms are located on an extension of a line of force of the spring body. 5. When the loading pin of each of the first and second swing arms is moved to the loading position, the loading pin engages with the teeth of the gear portion of the second swing arm to cause the first swing arm to move.
And a projection for preventing rotation of the gear portion of each of the second swing arms is provided on the gear portion of the first swing arm, and the projection is engaged with the tooth portion of the gear portion of the second swing arm. 5. The tape loading device according to claim 4, wherein the location is located on an extension of a line of force of the spring body of the second swing arm. 6. The mode switching member according to claim 2, wherein the mode switching member is a mode lever reciprocated on a straight path, and the tooth row portion of the mode switching member is a rack provided on the mode lever. 5. The tape loading device according to any one of 5.