JPS626598Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinch roller crimping device for a cassette tape recorder.

First, a conventional pinch roller crimping device shown in FIGS. 1 and 2 will be described.

Reference numeral 1 denotes a sliding board provided on the chassis 2 so as to be slidable in the direction of arrow A-A';
is biased by a spring 3 in the direction of arrow A'. 2a is a guide hole formed in the chassis 2, into which the bent piece 1a of the sliding board 1 is inserted. A magnetic head mounting plate 4 is mounted on the sliding substrate 1 with screws 5 and 6, and a magnetic head 7 is mounted and fixed on the mounting plate 4. Reference numeral 8 denotes a tape guide attached to the sliding substrate 1 with screws 9 on the side of the magnetic head 7. A pinch lever 10 is rotatably provided on a support shaft 11 on the chassis 2, and is rotatably provided with a pinch roller 12. Bent piece 10a of the pinch lever 10
enters into the through hole 1b of the sliding substrate 1 and is assembled, and when the sliding substrate 1 is in the position where it has slid backward as shown in FIG. 1, the inner edge of the through hole 1b engages with the bent piece 10a. The structure is such that when the sliding substrate 1 is in the forward sliding position as shown in FIG. has been done.

In such a configuration, the spring wire 14 for pressing and urging the pinch roller 12 onto the capstan 13 has a central winding portion 14a attached to a support shaft 15 set up on the sliding base plate 1, and a washer 16. One end 14b of the spring wire 14 comes into contact with the protruding piece 10b of the pinch lever 10, and the spring wire 14
The other end 14c of 4 is in contact with the upright piece 1c of the sliding board 1. Therefore, the spring wire 14
constantly applies rotational force to the pinch lever 10 in the counterclockwise direction.

To explain the operation of the configuration shown in FIGS. 1 and 2, in the stopped state shown in FIG.
The sliding board 1 is sliding backward in the direction of arrow A'.
At this time, the pinch lever 10 is connected to the spring wire 14.
However, since the bent piece 10a engages with the inner edge of the through hole 1b of the sliding substrate 1, it is held in the state shown in the figure.

From this state, when the sliding board 1 slides forward in the direction of arrow A against the spring 3, the state shown in FIG. 2 is reached.

Here, the transitional state from FIG. 1 to FIG. 2 will be explained. When the sliding board 1 moves forward in the direction of arrow A from the state shown in FIG. 12 contacts the capstan 13. This contact of the pinch roller 12 with the capstan 13 prevents the pinch lever 10 from rotating any further.
On the other hand, as the sliding board 1 slides slightly further forward in the direction of arrow A, the bent piece 10a and the inner edge of the through hole 1b are separated, and the pinch lever 10 is rotated by the force of the spring wire 14. The pinch roller 12 is elastically pressed against the capstan 13.

In the figure, 17 is a cassette, and 18 is a cassette 17.
It is a locating pin.

The above is a conventional pinch roller crimping device for a cassette tape recorder. In this way, the fulcrum of the pinch lever is on the chassis, and a part of the pinch lever engages or separates the sliding substrate, and in this separated state, In the configuration in which the pinch roller is pressed against the capstan, the engagement portion between the pinch lever and the sliding board receives the force of the spring wire 14 for urging the pinch roller, so when the sliding board slides backward, the force is applied as a load. It will work. Therefore, it is necessary to increase the force of the spring for returning the sliding board. If the force of this spring is increased, a large operating force will be required during playback operation, which is not desirable in a small tape recorder.

The present invention was proposed in order to improve the undesirable points of the above-mentioned conventional structure, and is particularly designed to reduce the force required during the regeneration operation.

The apparatus of the present invention is constructed as shown in FIGS. 3 and 4, and parts that are the same as those shown in FIGS. 1 and 2 are given the same reference numbers and their explanations will be omitted.

The feature of the device of the present invention lies in the shape and mounting condition of the spring wire.

That is, the spring wire 19 in the present invention is configured in an inverted shape, and one end of the spring wire 19 has a wound portion 19a.
is mounted and supported on a spindle using a screw 5 on the right side of the magnetic head mounting plate 4, and the other end 19b is opposed to the protruding piece 10b of the pinch lever 10. The intermediate portion 19c of the spring wire 19 is fitted into the left screw 6 of the magnetic head mounting plate 4, and a contact member 20 is formed of a sleeve.
It is configured so that it comes into contact with or separates from it.

In such an attached state of the spring wire 19, one end of the spring wire 19 is connected to the winding portion 1.
It has an elastic force in a clockwise direction around 9a, and when the sliding board 1 is sliding backward as shown in FIG.
The other end 19b is spaced apart from the recess inner wall 10b' of the protruding piece 10b of the pinch lever 10.

Then, as shown in FIG. 4, when the sliding board 1 slides forward due to the regeneration operation, the protruding piece 10b of the pinch lever 10 moves along with the sliding of the sliding board 1.
The other end 19b of the spring wire 19 comes into contact with the inner wall 10b' of the recess, and the spring wire 1
The intermediate portion 19c of 9 is separated from the abutting member 20,
Furthermore, as the bent piece 10a of the pinch lever 10 and the through hole 1b of the sliding base plate 1 are disengaged and separated, the spring wire 1 is attached to the pinch lever 10.
9 is applied, and the pinch roller 12 is elastically pressed against the capstan 13.

Since the device of the present invention is constructed as described above, the spring wire that presses and urges the pinch roller against the capstan acts only when the sliding board slides forward, and when the sliding board slides backward. Since it does not work when the sliding board is being moved, it is possible to weaken the spring force used to return the sliding board, and the operating force during playback operation can be reduced, making it possible to use small tape recorders. It is a practical item.

In particular, the device of the present invention is configured to attach one end of the spring wire and control the other end of the spring wire to approach and separate from the pinch lever using a pair of mounting screws that attach the head mounting plate to the sliding board. As a result, the number of attachment parts can be reduced, and the elastic force of the spring wire can be efficiently exerted.

[Brief explanation of the drawing]

1 and 2 are plan views of the conventional device in different states, and FIGS. 3 and 4 are plan views of the device of the present invention in different states. DESCRIPTION OF SYMBOLS 1...Sliding board, 1b...Through hole, 3...Return spring, 7...Magnetic head, 10...Pinch lever, 10a...Bend piece, 10b...Protruding piece, 1
2...pinch roller, 13...capstan,
19... Spring wire, 19a... One end winding part, 19b... Other end, 19c... Middle part, 20
...Sleeve as a contact member.

Claims (1)

[Claims for Utility Model Registration] A pinch lever equipped with a pinch roller is rotatably provided on the chassis, and the pinch lever is advanced relative to the capstan in relation to the sliding movement of a sliding board equipped with a magnetic head. In a tape recorder configured to allow retraction movement, a head mounting plate is provided on the sliding base plate with a pair of mounting screws, one end of which is mounted and supported by a portion of the mounting screw located on a side farther from the pinch lever; Further, a spring wire is provided with an intermediate portion facing toward and away from another mounting screw portion and a spring wire facing toward and away from the pinch lever at the other end, and the sliding board is slid backward. When the other end of the spring wire is moved away from the pinch lever by abutting the middle part of the spring wire with another mounting screw, and the sliding base plate is slid forward by a regeneration operation, when the spring 1. A pinch roller crimping device, characterized in that the other end of the wire is brought into contact with a pinch lever, and the other mounting screw part is separated from the intermediate part, so that the pinch roller is crimped against a capstan.