JPH0227417Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tape loading mechanism in a VTR (video tape recorder).

The tape loading mechanism for conventional VTRs consists of a pair of loading blocks that are movably disposed on both sides of the cylinder along a required path, and the lower part of the cylinder is connected to a swing path. There is one that is attached to a pair of loading arms. Then, in the standby position, the loading post set up on the loading block is inserted into the back side of the magnetic tape in the loaded tape pack, and the loading arm is driven to move the loading block and pull out the magnetic tape to the required position. I try to do tape loading.

However, in such conventional tape loading mechanisms, the swing path of the loading arm is located below the cylinder, so the height of the device body increases by the space for this swing path, making it smaller and thinner. There was a problem that it could not be sufficiently formalized. As another conventional example, a link mechanism is applied to the mechanism for moving the loading block, and the joints of this link mechanism are guided by guide grooves provided in the block material to move the loading block along a required path. There is something I did. In order to perform a smooth and accurate loading operation, it is necessary to operate a link mechanism using such a link mechanism while maintaining the roller body at the joint in a vertical position.
For this reason, it is necessary to set the depth or height of the guide groove to a required height, and a block material or deck of a thickness corresponding to this is used. However, the use of thick blocks or decks increases the weight, which poses a problem in making the device smaller and lighter.

This invention aims to solve these conventional problems.

This invention will be explained below based on the drawings. 1st
Figures 3 through 3 are diagrams showing an embodiment of this invention.

First, to explain the structure, in these figures, reference numeral 1 is a main deck, and 2 is a sub-deck.Both decks 1 and 2 are made of a plate-shaped body made of sheet metal, for example, and are suitably constructed to the extent that a link mechanism, which will be described later, can be inserted therein. VTR device body (not shown) at intervals
is installed on. A cylinder 3 is installed upright on the main body of the apparatus and is inclined at a predetermined angle with respect to both decks 1 and 2. 4 and 5 are a pair of loading blocks, each loading block 4,
Loading posts consisting of vertical posts 6a, 6b and inclined posts 7a, 7b are respectively erected at 5. Although not shown, positioning portions corresponding to stoppers to be described later are provided at the lower portions of the vertical posts 6a, 6b.

Next, the link mechanisms L ₁ and L ₂ for guiding and driving the pair of loading blocks 4 and 5 will be explained. Since the link mechanisms L ₁ and L ₂ are arranged completely symmetrically in structure and operation on both sides of the cylinder 3, the structure of the link mechanism on the L ₁ side will be mainly explained. First, reference numeral 8a is a drive link, and this drive link 8a is rotatably attached to the worm wheel 12a via bushes 9a, 9b and a pin 11, and both 8a, 1
A coil spring 13a is stretched between the coil springs 13a and 2a in a substantially semicircular shape, and the drive link 8a has a tendency to rotate counterclockwise in FIG. ). This rotational tendency causes the locking pin 14a provided upright on the worm wheel 12a to
It is regulated by locking a′. The pin 11 protrudes upward in FIG. 2 by a required amount, and is attached to the mounting plate 15 at this protrusion.
The mounting plate 15 is fixed to the sub-deck 2. A worm gear 12a' is carved on the circumferential surface of the worm wheel 12a, and the worm gear 12a' meshes with the worm 16. 16a
is attached to the worm 16 by a driven pulley, and a belt (not shown) is stretched between the driven pulley 16a and a drive pulley 17 on the rotational drive source (motor) side. The drive pulley 17, belt, and driven pulley 16a connected to the rotational drive source,
The worm 16, worm gear 12a', etc. constitute a rotational drive system of the drive link. A dowel 8 that slides into contact with the sub-deck 2 is provided on the surface of the drive link 8a facing the sub-deck 2 near the drive end.
Next, an intermediate link 19a is rotatably connected to the drive end of the drive link 8a by a pin 18, and a bush 22a and a pin 2 press-fitted therein are connected to the other end of the intermediate link 19a.
A driven link 23a is rotatably connected by 2b. The bush 22a and pin 22b also function as a roller body 22 that engages with a second guide groove, which will be described later. Furthermore, a loading block 4 is pivotally supported at the driven end of the driven link 23a. 25a is a pin protruding from the loading block 4, 25b is a bush, and the pin 25a is fitted into this bush 25b.

As mentioned above, the link mechanism is configured as a three-bar link consisting of a driving link, an intermediate link, and a driven link, and the pair L ₁ and L ₂ are connected to the cylinder 3.
Main deck 1 and sub deck 2 on both sides of
It is placed interposed between.

On the other hand, in order to restrict the movement of such link mechanisms L ₁ and L ₂ and move the loading blocks 4 and 5 along a predetermined path, a pair of link mechanisms are provided.
The main deck ₁ and the sub deck 2 have a pair of first guide grooves 1a and 1a, corresponding to L1 and _L2 , respectively.
1b, and second guide grooves 2a, 2b are bored. A driven link 23a is provided in the first guide groove 1a.
The driven end of the pin 25a is slidably fitted into the second guide groove 2a, and the intermediate link 1 is slidably fitted into the second guide groove 2a.
The connection point between 9a and the driven link 23a, that is, the roller body 22 is slidably fitted. At the lower portions of the loading blocks 4 and 5, with the main deck 1 in between, slide plates 26 having spring properties are fixed with screws 27, respectively. 28a at the terminal end of the first guide grooves 1a, 1b,
28b is a stopper for loading blocks 4 and 5.
This is for positioning each of the.

Also, _H1 is a full-width erase head, and _H2 is an audio head.
A control head, P a tape pack to be loaded, 29 an impedance roller, 30 a guide roller, and 31 a tension arm pin.

Next, the operation will be explained with reference to FIG. At the time of starting, the link mechanisms L ₁ and L ₂ extend downward as shown in FIG. 1, and the loading blocks 4,
5 is in the standby position. In this state, tape pack P
loading post 6 when loaded into the device body.
a, 7a, 6b, 7b enter the back side of the magnetic tape T. Next, when the rotational drive system is driven, one of the worm wheels 12a rotates counterclockwise in FIG.
The dowel 8a'' also rotates in the same direction while slidingly contacting the sub-deck 2. With this rotation, the roller body 22 is guided to the second guide groove 2a, and the driven end of the driven link 23a, that is, the loading The block 4 is guided by the first guide groove 1a and starts moving upward in FIG. 1. At the same time, the other worm wheel 12b rotates clockwise in FIG. and the other link mechanism L ₂
Each member starts to move completely symmetrically to the above, and the other loading block 5 also moves upward in FIG. The magnetic tape T is pulled out from the tape pack P by the movement of the loading blocks 4 and 5, and when the loading blocks 4 and 5 are moved to a predetermined position regulated by the stoppers 28a and 28b, as shown in FIG. In this way, the magnetic tape T is wound around the cylinder 3 more than half a turn and loaded. In addition, both worm wheels 12a and 12b have loading blocks 4 and 5 that are connected to stoppers 28a and 2, respectively.
Even after coming into contact with 8b and restricting its movement, it continues to rotate slightly by the rotational drive system. Due to this rotation, one drive link 8a is given a tendency to rotate counterclockwise in FIG. 4, and the other drive link 8b is thereafter given a tendency to rotate in a clockwise direction. Due to this rotational tendency, loading blocks 4 and 5
are pressed against the respective stoppers 28a and 28b, and the above-mentioned loading state is reliably maintained.

As detailed above, according to this invention, the mechanism for guiding and driving a pair of loading blocks is composed of a drive link, an intermediate link, and a driven link.
On the other hand, a main deck and a sub-deck made of plate-shaped bodies are arranged in parallel at appropriate intervals on the main body of the device, and the link mechanism is interposed between the main deck and the sub-deck on the side of the cylinder, The driven end of the driven link (loading block) is connected to the first hole drilled in the main deck.
Since the connecting point between the intermediate link and the driven link is guided by a guide groove, and the second guide groove bored in the sub-deck is used to guide the connecting point, the entire device can be made thinner, and the loading block can be moved smoothly and accurately. This has the effect of being able to.
In addition, since the link mechanism is composed of three-bar links, the two-dimensional operating area of the mechanism that guides and drives the loading block can be reduced, and the VTR device can also be made smaller in plan. You can get the effect that you can. Furthermore, the connection points between the links are guided by guide grooves provided separately on the upper and lower decks, so even if the decks are made of thin plates, the roller bodies, etc. at the connection points will not move when moving. vertical holding is carried out accurately. Therefore, it is possible to achieve the effect that the weight of the device can be reduced.

Furthermore, according to an embodiment in which the drive link is rotatably attached to the worm wheel, a coil spring is stretched between the drive link and the worm wheel, and the drive link is driven to rotate via the coil spring. In addition to the above common effects,
The advantage is that the structure in which the loading block is held in pressure contact with the stopper is easy, and the action can be ensured.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the tape loading mechanism in a VTR according to this invention. Figure 1 is a partially cutaway plan view, and Figure 2 is a partially cutaway side view. , FIG. 3 is a plan view showing parts such as the sub-deck and the mounting plate, and FIG. 4 is a plan view for explaining the operation. 1: Main deck, 1a, 1b: 1st guide groove, 2: Sub deck, 2a, 2b: 2nd guide groove, 3: Cylinder, 4, 5: Loading block, 6a, 6b: Vertical post, 7a, 7b: Inclined Post, 8a, 8b: Drive link, 12a, 12
b: Worm wheel, 12a', 12b': Worm gear, 16: Worm, 16a: Driven pulley,
17: driving pulley, 19a, 19b: intermediate link, 22: roller body, 23a, 23b: driven link, 28a, 28b: stopper, L ₁ , L ₂ : link mechanism, P: tape pack, T: magnetic tape.

Claims (1)

[Claims for Utility Model Registration] Drive links 8a and 8b that are rotated by being driven by a rotational drive system such as a worm gear, and this drive link 8.
Intermediate link 19 rotatably connected to a and 8b
a, 19b, and loading posts 6a, 6b, 7a, 7b rotatably connected to the other ends of the intermediate links 19a, 19b, and at their driven ends, respectively.
A link mechanism L1, L2 consisting of driven links 23a, 23b supporting a pair of upright loading blocks 4, 5 is arranged symmetrically on both sides of the cylinder 3, and on the other hand, a plate arranged on the main body of the device. First guide grooves 1a, 1b are bored in the main deck 1, which is a shaped body, at symmetrical positions with the cylinder 3 as a boundary, and the driven links 23a, 23 are provided in the first guide grooves 1a, 1b.
Further, second guide grooves 2a and 2b are bored in the sub-deck 2, which is made of a plate-shaped body and is located below the main deck 1, at symmetrical positions with the cylinder 3 as the boundary, and The guide grooves 2a, 2b guide the connecting points of the driven links 23a, 23b and the intermediate links 19a, 19b, and the loading posts 6a, 6b, 7a, 7
b is inserted into the back side of the magnetic tape at the standby position of the magnetic tape in the tape pack loaded in the apparatus main body, the loading blocks 4 and 5 are guided and driven by the drive system, and the magnetic tape is wound around the cylinder 3. characterized by bringing into contact
Tape loading mechanism in VTR.