JPH08287555A - Catcher of tape loading device - Google Patents

Abstract

PURPOSE: To prevent the creep deformation of the catcher of a tape loading device by the pressurized contact of a leading guide block. CONSTITUTION: This catcher 3 has a holding piece 31 with which the leading guide block 5 comes into pressurized contact and supporting arms 4, 4 which are disposed in approximately parallel with the pressurized contact direction of the leading guide block 5 and regulate the run-out of rotation around the contact part of the leading guide block 5 with the holding piece 31 by coming into contact with the bottom end of the leading guide block 5. A reinforcing rods 40 are installed between both supporting arms 4 and 4. The reinforcing rod 40 is disposed to flatly have a spacing from the holding piece 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a VTR, and more particularly to a catcher provided at a loading completion position on a chassis and crimped by a leading guide block for drawing a magnetic tape from a cassette. .

[0002]

2. Description of the Related Art The following is known as a catcher (3) to which a leading guide block (5) pulling out a magnetic tape (6) from a cassette presses at a loading completion position. FIG. 10 is a plan view of a conventional catcher (3), and FIG.
1 is a side view of the above. Catcher (3) is the base (30)
A holding piece (31) having a V-shaped abutment surface with which the front end of the leading guide block (5) is in contact with the end of the holding guide (31) is provided in the upper part, and extends parallel to each other along the loading direction of the leading guide block (5). A pair of supporting arms (4) (4) is provided at the bottom. The leading guide block (5) is pushed by the loading link (7) sliding on the chassis (1) and is crimped to the catcher (3). The leading guide block (5) has its front end crimped to the front surface of the holding piece (31) to prevent displacement in the plane of the chassis (1), and its lower end to be one of the supporting arms (4) and (4). In contact with one inner surface, rotational runout is restricted in a plane perpendicular to the pressure bonding direction.
The catcher (3) is generally formed by aluminum die casting, but recently, in order to reduce the manufacturing cost, it is often formed by injection molding of synthetic resin.

[0003]

[Problems to be Solved by the Invention]

1, the loading link (7) is the leading guide block (5)
The pressing force applied to the tape has a strength of several hundreds of grams to stabilize the tape running. Since the catcher (3) is made of synthetic resin, if the pressure applied to the leading guide block (5) continues for a long time, the support arms (4) and (4) are likely to undergo creep deformation, and this time Due to the change, the inclination state of the leading guide block (5) changes, and the tape running cannot be stabilized. Particularly in recent years, in order to shorten the time from fast-forwarding and rewinding of the tape to image reproduction, fast-forwarding and rewinding are often performed while the leading guide block (5) is crimped to the catcher (3). The risk of creep deformation of the arms (4) (4) increases. 2. Since the catcher (3) is a resin molded product, it is generally made by using a molding die. However, the mold has a movable mold and a fixed mold that are separated into upper and lower parts, and the structure in which both molds are butted against each other is the simplest and easy to create. Therefore, when the shape of the catcher (3) is changed, it is desirable that the movable die and the fixed die be formed by butting. SUMMARY OF THE INVENTION It is an object of the present invention to prevent creep deformation due to pressure bonding of a leading guide block in a catcher, and to perform molding with a simple mold structure.

[0004]

Means for Solving the Problems A pair of supporting arms of a catcher
(4) Between the (4), leading guide block than the holding piece (31)
(5) A reinforcing rod (40) is provided at a position displaced along the approaching direction, and the tips of the supporting arms (4) and (4) are connected by the reinforcing rod (40).

[0005]

[Operation and effect] Since the reinforcing rod (40) is installed between the supporting arms (4) and (4), even if the pressure of the leading guide block (5) is applied to the supporting arms (4) and (4). The creep deformation of the supporting arms (4) (4) can be prevented. Also, the reinforcing rod (40) and the holding piece (31)
Since they are spaced apart in a plane, the holding piece (31) does not get in the way when the reinforcing rod (40) is integrally formed with the supporting arms (4) and (4) by a mold. Therefore, the reinforcing rod (40) can be formed with the most basic structure in which the mold is separated into upper and lower parts and molded.

[0006]

An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, a guide groove (12) on which a leading guide block (5) slides is formed at a side of the rotary cylinder (2) on the chassis (1), and a leading groove is provided at a loading completion position. Catcher (3) to which the guide block (5) is crimped
Will be deployed. The catcher (3) has a base (3
The guide piece (0) is integrally formed with a holding piece (31) to which the leading guide block (5) is crimped and a pair of supporting arms (4) and (4), and is formed by injection molding of synthetic resin such as PPS (polyphenylene sulfide) resin. .
Leading guide block (5) from cassette to magnetic tape (6)
Pull out and crimp it to the catcher (3),
By winding (6) around the rotary cylinder (2), recording and reproduction are performed as is well known. The leading guide block (5)
A pair of the rotary guides 2 are provided on both sides of the rotary cylinder 2. However, for convenience of description, only the left guide block 5 will be described, and the right guide block will not be described.

As shown in FIG. 2, the leading guide block (5) comprises a base (9) made of PPS resin and a metal tilt pin (50) and a guide roller (51) at the front end. Become. The guide roller (51) is fitted into the first boss (90) protruding upward from the base (9), and the second boss (91) is coaxial with the first boss (90) from the lower surface of the base (9). Project to. The third boss (92) projects downward from the rear end of the base (9), and the loading link (7) is fitted into the third boss (92). As shown in FIG. 1, the loading link (7) is rotatably fitted to the shaft (10) protruding from the lower surface of the chassis (1),
The leading guide block (5) is pressed against the catcher (3) by rotating clockwise.

The base (30) of the catcher (3) is the chassis (1)
The holding piece (31) is positioned above the chassis (1) and the pair of support arms (4) and (4) are positioned below the chassis (1) in a state where the holding piece (31) is placed on the top and screwed. Positioning protrusions (32) (32) project from the lower surface of the base (30), and the positioning protrusions (32) (32)
The catcher (3) is accurately positioned on the chassis (1) by the fitting of the chassis and the chassis (1). 3, 4, and 5 are a perspective view, a plan view, and a front view of the catcher (3), respectively.
The holding piece (31) has a V-shaped receiving surface on the front surface, and the holding piece (31)
The first boss (90) is on the front side, and the second boss is between the supporting arms (4) (4).
(91) fits in. Since the third boss (92) receives a leftward load due to the loading link (7) fitted in the third boss (92), the leading guide block (5) contacts the holding piece (31). The second boss (91) contacts the inner surface of the left supporting arm (4) and is positioned so as to be biased clockwise in the center. Support arm
(4) A reinforcing rod (40) is installed between the lower end faces of (4) at positions displaced along the leading direction of the leading guide block (5). The reinforcing rods (40) prevent the supporting arms (4) from bending when a pressing load of the second boss (91) is applied to the supporting arms (4) by the loading link (7).

As shown in FIG. 4, when the catcher (3) is viewed from above, the side surface of the holding piece (31) and the inner surfaces of the supporting arms (4) and (4) are separated by a gap S, and the holding piece ( 31) Tip and reinforcing rod (40)
Are separated from each other by a gap L. The catcher (3) is formed by injection molding as described above.
The catcher (3) is moved up and down by providing a gap between 1) and the supporting arms (4) (4) and the reinforcing rod (40) so that they do not overlap when projected in a plane. It can be molded with a structure that separates into.

6 to 8 show a mold for molding the catcher (3), FIG. 6 is a plan view of the movable mold (8), and FIG. 7 is a movable mold.
FIG. 8 is a front view of (8) and the fixed mold (80), and FIG. 8 is a cross-sectional view of both molds (8) and (80) butted together. From the movable type (8),
The (81) projects upward, and a concave groove (82) is formed around the protrusion (81). The protrusion (81) fits into the recess (83) of the fixed mold (80), and the space between the recess (83) and the protrusion (81) is filled with the molten resin injected from the injection hole (84). , Base (30) and holding piece (31)
To form. The molten resin filling the groove (82) forms the supporting arms (4) (4) and the reinforcing rod (40). The lower surface of the projecting piece (85) protruding from the fixed mold (80) is located at the upper end of a portion of the groove (82) that is to be the reinforcing rod (40). Retaining piece (31) and supporting arm
(4) Since the reinforcing rod (40) and the reinforcing rod (40) are in a positional relationship where they do not overlap with each other in a plane, as shown in FIG. 9, the protrusion (81) of the movable type (8) has the support arm (4) ( 4) It can be fitted with the fixed mold (80) by rubbing through between the places that should be 4). Also, reinforcement rod
Since the (40) is separated from the holding piece (31) in a plane, the reinforcing rod
Even if the (40) is provided, it does not interfere with the protrusion (81) when releasing the mold. Therefore, it is not necessary to change the mold structure in order to form the reinforcing rod (40), and it can be manufactured at low cost.

In the catcher (3) of this embodiment, since the reinforcing rod (40) is installed between the supporting arms (4) and (4), the supporting arms (4) and (4) are provided. Even if the crimping force of the leading guide block (5) is applied, creep deformation of the supporting arms (4) and (4) can be prevented. Further, since the reinforcing rod (40) and the holding piece (31) have a gap L in a plane, the reinforcing rod (40) is supported by the mold to support the arm (4).
The holding piece (31) does not get in the way when it is molded integrally with (4). Therefore, the reinforcing rod (40) can be formed with the most basic structure in which the mold is separated into upper and lower parts and molded.

The above description of the embodiments is for explaining the present invention and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a plan view of a catcher, a leading guide block, and a chassis.

FIG. 2 is a side view of a leading guide block and a loading link.

FIG. 3 is a perspective view showing a fitted state of a first boss, a second boss and a catcher of the leading guide block.

FIG. 4 is a plan view of a catcher.

FIG. 5 is a front view of the above.

FIG. 6 is a plan view of a movable die.

FIG. 7 is a front view of a movable die and a fixed die.

FIG. 8 is a cross-sectional view showing a state where a movable die and a fixed die are butted against each other.

FIG. 9 is a perspective view showing a positional relationship between a movable protrusion and a catcher.

FIG. 10 is a plan view of a conventional catcher.

FIG. 11 is a side view of the above catcher.

[Explanation of symbols]

 (4) Support arm (5) Leading guide block (6) Magnetic tape (31) Holding piece (40) Reinforcing rod

Claims (1)

[Claims] 1. A leading guide block is provided substantially parallel to a holding piece (31) to which a leading guide block (5) for pulling out a magnetic tape (6) from a cassette is crimped, and a leading guide block (5). It is formed by injection molding with a pair of support arms (4) and (4) which are in contact with the lower end of (5) and regulate the rotational runout in the plane perpendicular to the direction of advance of the guide block (5). In the catcher of the tape loading device, the reinforcing rod (40) is placed between the support arms (4) and (4) at a position displaced from the holding piece (31) along the leading direction of the leading guide block (5). A catcher for a tape loading device, wherein the catcher is arranged and the tips of the supporting arms (4) and (4) are connected by the reinforcing rod (40).