JPH034992Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tape loading mechanism in a VTR (video tape recorder) suitable for small-sized VTRs.

An example of a tape loading mechanism in a conventional VTR is a link type. This tape loading mechanism has a rotatable loading ring arranged around a rotary cylinder, and a tape pull-out guide attached to the loading ring to pull out the tape to a required winding position. However, this ring type requires a considerable amount of installation space in the vertical direction, so it is small.
The problem was that it was unsuitable for VCRs.
Another conventional example is an arm-type device that includes a pair of loading arms. This arm type has a loading post erected at the tip of each loading arm, and the tape is wound around a rotating cylinder by rotating both loading arms in opposite directions. . By the way, in some types of VTRs, standards require that the amount of tape wrapped around the rotating cylinder be set to a large amount. However, this arm type has a problem in that the arrangement of both loading arms is unreasonable when a large amount of tape is wound around the rotary cylinder.

This invention aims to solve these conventional problems.

This invention will be explained below based on the drawings. 1st
The figure and FIG. 2 are diagrams showing an embodiment of this invention. The loading blocks and link mechanisms are installed in pairs on the left and right sides of the rotary cylinder and move symmetrically. The loading blocks and the like are shown in their initial positions when the engine is started, and those on the left side of the figure are shown in their positions after the loading operation.

First, to explain the configuration, reference numeral 1 in FIG. 2 is a machine base, and a sub-deck 2 is placed above the machine base 1 at an appropriate interval sufficient to accommodate a link mechanism to be described later.
is installed. 3 is a rotating cylinder, machine base 1
and is erected and inclined at a required angle with respect to the sub-deck 2. A pair of loading blocks 4 and 5 are installed on the sub-deck 2 on both left and right sides of the rotating cylinder 3. The loading blocks 4 and 5 each have arc-shaped first guide grooves (guide paths) 6a and 6b formed opposite to each other on the sub-deck.
It is said that it can be moved freely along the Each loading block 4, 5 is provided with a loading post consisting of a vertical post 7a, 7b and an inclined post 8a, 8b, respectively. Although not shown, a positioning portion corresponding to each of the stoppers 9a, 9b is formed at the lower part of each vertical post 7a, 7b.

Next, the drive mechanism and link mechanism for driving the pair of loading blocks 4 and 5 will be explained. First, the drive mechanism will be described. A motor M is installed on the lower surface of the machine base 1, and a drive pulley 11 is attached to the output shaft of the motor M. On the other hand, a rotary drive shaft 12 is installed horizontally on the upper surface of the machine 1 and at a position appropriately above the rotary cylinder 3 (a position opposite to the tape pack mounting side).
A belt 13 is stretched between the driven pulley 12a and the drive pulley 11. A pair of left and right worms 1 are mounted on the rotation drive shaft 12.
4a and 14b are carved, and each worm 14
1 that engages with a and 14b and rotates in opposite directions
A pair of worm wheels 15 and 16 are rotatably disposed on the machine base 1. Next, the link mechanism will be explained. Since a pair of link mechanisms are provided symmetrically on both the left and right sides of the rotary cylinder 3, the structure of the link mechanism will mainly be explained with respect to the one on the right side of FIG. The link mechanism is composed of three-bar links: a first link 17a, a second link 18a, and a third link 19a. The first link 17a is the button 21
a, 21b and a pin 22 so as to be rotatable with respect to the worm wheel 15, and a coil spring 23a is stretched in a substantially semicircular shape between both 15 and 17a. In FIG. 2, a rotation tendency is given in the clockwise direction (the other first link 16 is rotated in the counterclockwise direction). This rotational tendency causes the notch end 1 of the first link 17a to
This is regulated by locking 7a'. A second link 18a is rotatably connected to the drive end of the first link 17a by a pin 24a, and a third link 19a is rotatably connected to the other end of the second link 18a by a bush 25a and a pin 25b. has been done. The bush 25a also functions as a slider that slidably engages with a second guide groove 26a formed in the machine base 1. And then the third
A loading block 4 is pivotally supported at the other end of the link 19a. 27a is a pin protruding from the loading block 4, and 27b is a bush.
The pin 27a is slidably engaged with the first guide groove 6a. Reference numeral S in FIG. 2 denotes a switch interposed in the power supply line of the motor M. 28
a is the switch drive pin during loading,
28b is a switch drive pin during unloading, and both drive pins 28a and 28b are fixedly mounted on the worm wheel 16.

_H1 is full width erase head, _H2 is audio control head, P is tape pack, T is tape,
29 is an impedance roller. Full-width erase head H ₁ and audio control head H ₂
Both are moved back from the path of the loading blocks 4 and 5 during loading by a mechanism not shown, and return to their original positions after passing the loading blocks 4 and 5.

Next, the action will be explained. At the beginning of startup, the link mechanism extends downward in FIG. 1 and is in a standby position as shown by the loading block on the side number 4. When the tape pack P is loaded into the apparatus in this state, the loading posts 7a, 7b, 8a, 8b enter the back side of the tape T. Next, when the motor M is driven and the rotary drive shaft 12 starts rotating, one worm wheel 15 rotates clockwise and the other worm wheel 16 rotates counterclockwise. The movement below this rotation will be explained mainly with respect to the link mechanism on the right side of FIG.
a, and this first link 17a also rotates in the same direction. Due to this rotation of the first link 17a,
The slider at the connection point between the second link 18a and the third link 19a is guided by the second guide groove 26a, and the loading block 4 is guided by the first guide groove 6a and starts moving upward in FIG. do. At the same time, the other link mechanism etc. also start a movement completely symmetrical to the above, and the other loading block 5 also moves upward. The tape T is then pulled out from the tape pack P and wound around the rotating cylinder 3 in a state in which the required spaced positions on the back surface of the tape T are supported by the respective loading posts in both loading blocks 4 and 5. . Even after the loading blocks 4 and 5 come into contact with the stoppers 9a and 9b and their movement is restricted, both the worm wheels 15 and 16
continues to rotate against the elasticity of the coil springs 23a and 23b, and stops rotating when the switch drive pin 28a drives the switch S and reverses it to OFF. Loading ends in this way. The loading blocks 4, 5 are pressed against the respective stoppers 9a, 9b by the elasticity of the respective coil springs 23a, 23b, and the loading state is reliably maintained.

In this way, the worm wheels 15 and 16 disposed at the left and right positions on the upper side of the rotating cylinder move the loading blocks 4 and 5 as if lifted by a link mechanism, and this movement causes the tape T to rotate. Since the tape is wrapped around the cylinder 3, it is easy to set the amount of tape wrapping around the rotary cylinder 3 to be large, as shown by the winding angle α ₂ in FIG. Note that the winding angle α ₁ indicates the conventional tape winding amount.

As detailed above, according to this invention, a pair of worm wheels are disposed at the left and right positions on the upper side of the rotating cylinder, and worms are formed on the left and right sides to mesh with each of the worm wheels, so that each of the worm wheels A common rotary drive shaft that rotates the worm wheels in opposite directions is installed horizontally, and a link mechanism is installed between the corresponding worm wheels and loading blocks, so the installation space is reduced compared to conventional ring types. becomes smaller and becomes smaller
This provides the advantage of being able to provide a tape loading mechanism suitable for VTR use. Further, an effect can be obtained in that it is easy to set a large amount of tape to be wrapped around the rotating cylinder.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the tape loading mechanism in a VTR according to the invention, and FIG. 2 is a side view of the same, showing the link mechanism both before and after loading. 1...Machine base, 2...Sub deck, 3...Rotating cylinder, 4, 5...Loading block, 6
a, 6b...first guide groove, 7a, 7b...vertical post, 8a, 8b...inclined post, 11...drive pulley, 12...rotation drive shaft, 12a...driven pulley, 13...belt, 14a, 14b... Worm, 15, 16... Worm wheel, 17
a, 17b...first link, 18a, 18b...
Second link, 19a, 19b...Third link, 2
6a, 26b...second guide groove, M...motor,
T...tape.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of loading blocks each having a loading post erected thereon are disposed on both left and right sides of a rotating cylinder so as to be movable along a required guide path, and each of the loading posts to move the tape by supporting the required spaced position on the back of the tape, and wrap the tape around the cylinder.
In a tape loading mechanism for a VTR, a pair of worm wheels are disposed at left and right positions on the upper side of the rotating cylinder, and worms that mesh with the worm wheels are formed on the left and right, and the worm wheels are connected to each other. A common rotary drive shaft for rotating in opposite directions is installed horizontally, and a link mechanism is installed between the corresponding worm wheel and loading block.
Tape loading mechanism in VTR. 2 The link mechanism includes a first link that is attached to the worm wheel and rotates, a second link that is rotatably connected to the first link, and a second link that is rotatably connected to the first link.
A tape loading mechanism in a VTR according to claim 1, which is a three-bar link comprising a third link rotatably connected to the other end of the link.