JPH04103326U - Brake mechanism of magnetic recording/reproducing device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts and downsize. [Configuration] A pair of left and right reel stands 12L, 12R arranged on the chassis 11, and these reel stands 12L, 12R.
Two left and right brake arms 15L, 15R are swingably supported near the reel stand 12L,
Brake arms 15L and 15 corresponding to 12R respectively
In the brake mechanism of the magnetic recording/reproducing device that brakes the rotation of the reel stands 12L, 12R by bringing R into frictional contact, the pair of left and right reel stands 12L, 12 are mounted on the chassis 11.
A support pin 14 is erected at a position equidistant from R, and the two brake arms 15L, 15R are swingably supported on the support pin 14, and a slide member 17 is guided and displaced by the support pin 14. is provided, and by displacement of this slide member 17 in one direction, the pair of brake arms 1
5L and 15R are swing-driven to brake the rotation of reel stands 12L and 12R.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is a brake for magnetic recording and reproducing devices such as video tape recorders (VTRs). Regarding the key mechanism.

0002

[Conventional technology]

As is well known, a VTR has a supply reel disk and a tape on the chassis. A backup reel disk is installed in parallel, and each tape is attached to each of these reel disks. Attach the reel wrapped with tape and drive the reel disk to run the tape. Let it go. And on the chassis there is a brake that stops the rotation of each reel disc. A mechanism is provided, and this brake mechanism prevents the reel disc from moving during stop mode, etc. Restrain and prohibit rotation of the reel disc.

0003 Conventionally, the above-mentioned brake mechanism has a support pin etc. near each reel disc. The brake arm is erected to support the brake arm in a swingable manner, and also connected to the actuator. It is known that a sliding member is guided by a guide pin or the like and supported so that it can be displaced linearly. Ru. Such a brake mechanism drives a sliding member using an actuator. The displacement of this slide member causes each brake arm to swing and each reel detent to move. Restrain (release) the disk.

0004

[Problem that the idea aims to solve]

However, in the conventional brake mechanism described above, each brake arm has A support pin must be provided for each, and a guide to guide the sliding member. Pins must also be provided, and arranging these pins requires a large area on the chassis. It is said that it has to be secured, which leads to an increase in the size of the whole, and there are also a large number of parts. There was a problem.

[0005] This idea was made in view of the above problems, and it can reduce the number of parts and further The purpose is to provide a brake mechanism for a magnetic recording/reproducing device that can be made smaller. .

[0006]

[Means to solve the problem]

In order to achieve the above purpose, this invention consists of a pair of left and right ribs placed on the chassis. A reel stand and two left and right blocks each swingably supported near the reel stand. Equipped with a rake arm, each brake arm is in friction contact with the reel stand. In the brake mechanism of a magnetic recording/reproducing device that brakes the rotation of the reel stand by Support pins are erected on the chassis at positions equidistant from the pair of left and right reel stands, The two brake arms are swingably supported on this support pin, and the A slide member is provided which is guided by a support pin and is displaced in one direction. The pair of brake arms are driven to swing by a displacement of .

[0007]

[Effect]

The brake mechanism of this invention automatically swings two brake arms onto a single support pin. This support pin can also be used as a guide pin to guide the slide member. The number of parts can be reduced by using brake arms, etc. The overall size can be reduced without requiring a large area.

[0008]

【Example】

Hereinafter, embodiments of this invention will be described with reference to the drawings. 1 to 4 show a brake device for a magnetic recording/reproducing device according to an embodiment of this invention. 1 is an overall plan view with the brake inactive, FIG. 2 is a perspective view of the main parts, and FIG. 3 is an overall plan view of the brake in non-operating state. FIG. 4 is an exploded perspective view of the main parts and a plan view of the entire brake in an operating state.

[0009] In FIG. 1, 11 is a chassis, and a supply reel is mounted on the chassis 11. Disc (reel stand) 12L and take-up reel disk (reel stand) 12R. are arranged at the top and bottom of the figure. As is well known, these reel discs 12L, 1 2R is a reel motor (not shown) rotatably supported by the chassis 11; The cassette reel is placed on top. these reels Disks 12L and 12R are selected according to the tape running direction by a capstan motor. It is selectively driven to rotate and run on the tape wound between the reels of the cassette. let

0010 In addition, the chassis 11 has a reel disk between the reel disks 12L and 12R. 12L and 12R from the line connecting the rotation centers of each reel. Support pins 14 are erected at positions equidistant from the plates 12L and 12R. This support The holding pin 14 passes through a center plate (sliding member) 17, which will be described later, and A supply reel disk 12L for braking and a take-up are placed above the computer plate 17. The two brake arms 15L and 15R for braking the reel disc 12R swing automatically. Currently supported.

[0011] The brake arm 15R for braking the take-up reel disc 12R is shown in Figure 2 and As shown in detail in FIG. An insertion hole 16a is formed in the curved portion, and a first spring locking portion 16b is provided at one end. A stopper portion 16c and a second spring locking portion 16d are provided at the other end. A support pin 14 is rotatably inserted into the insertion hole 16a of the brake arm 15R. A brake shoe arm 21R is swingably supported at the other end, and a second spring The main brake is connected between the spring locking portion 16d of the chassis 11 and the spring locking portion 13R of the chassis 11. A key spring 18R is tensioned. This brake arm 15R is The other end approaches the take-up reel disc 12R due to the rake spring 18R. In other words, the direction in which the brake shoe 19R (described later) is 12R. Although not shown, this brake arm A contact portion that contacts the center plate 17 is formed on the lower surface of the contact member 15R. In addition, 20 is a bush, and this bush 20 is attached to the brake arms 15L, 1. A support pin 14 is inserted between the 5R and 5R.

0012 The middle part of the brake shoe arm 21R is rotatable to the brake arm 15R. supported, and positioned at one end between the stopper portion 16c and the second spring locking portion 16d. The shoe mounting part 22a is placed on the other end, and the spring locking part 22b is provided on the other end. Ru. This brake shoe arm 21R has a brake shoe attached to the shoe mounting portion 22a. 19R is fixed, and the first spring locking portion 16b and the first spring locking portion 16b are fixed to the spring locking portion 22b. A double-acting spring 20R is stretched between the two. This brake shoe arm 21 R is such that the shoe mounting portion 22a hits the stopper portion 16c due to the double acting spring 20R. The brake shoe 19R is biased in the direction of contact, and the brake shoe 19R is biased in the leading direction (biting direction). Braking force became excessive due to frictional contact with the take-up reel disc 12R (direction). In this case, it swings in the direction away from the stopper portion 16c.

[0013] The brake arm 15L for braking the supply reel disc 12L is also the brake arm 15L mentioned above. Similar to the key arm 15R, an insertion hole 16a through which the support pin 14 is inserted is provided in the bent portion. A first spring locking portion 16b is provided at one end, and a stopper portion 16c and a second spring are provided at the other end. A ring locking portion 16d is formed. This brake arm 15L has both sides of the bent part. The side is bent downward, and the spring of the chassis 11 is attached to the second spring locking portion 16d. A main brake spring 18L is stretched between the main brake spring 18L and the other end of the main brake spring 18L. Rake shoe arm 21L is rotatably supported. This brake shoe arm 21L also has a shoe attachment part 22a formed at one end to which the brake shoe 19L is fixed. and a double-acting spring 20L is stretched between the other end and the first spring locking portion 16b. A spring locking portion 22b is formed. In addition, these brake arms 15L and brake shoe arm 21L are the above-mentioned brake arm 15R and brake shoe arm 21L. It has the same configuration as the new arm 21R, and corresponding parts are given the same numbers. Explanation will be omitted.

[0014] The center plate 17 includes a reel disc, as shown in detail in FIGS. 2 and 3. A contact portion 17a parallel to a line connecting the rotation centers of 12L and 12R; It consists of a substantially T-shaped plate member having orthogonal sliding contact portions 17b. This center play Two guide grooves 33a and 33b are formed in the guide groove 17, and the guide groove 33a has the above-mentioned groove. The support pin 14 is inserted into the guide groove 33b and the guide pin 34 is implanted in the chassis 11. It is inserted. This center plate 17 has a contact portion 17a that is attached to the brake arm 15. The end of the sliding contact portion 17b contacts the contact pins 88L and 88R of L and 15R, and the end of the sliding contact portion 17b contacts the intermediate arc. 35. This center plate 17 is inserted into the guide groove 33a. The support pin 14 is guided by the guide pin 34 inserted into the guide groove 33b. Displaces left and right during 1.

[0015] The intermediate arm 35 has a substantially doglegged shape, and the intermediate bent portion rotates automatically to the chassis 11. one end is connected to the end of the sliding part 17b of the center plate 17, and the other The end engages the solenoid plate 37. The solenoid plate 37 is The end is connected to the plunger of the solenoid 40, and is driven by the solenoid 40. Displaces up and down in 1. The solenoid 40 is connected to the solenoid plate 3 by a plunger. 7 to swing the intermediate arm 35 via the solenoid plate 37. The center plate 17 is displaced by the swinging of the intermediate arm 35, and each brake arm 15L, 15R swings.

[0016] In such a brake mechanism, when the solenoid 40 is not energized, each Brake arms 15L and 15R are connected to main brake springs 18L and 1, respectively. With the elastic force of 8R, the brake shoe arm 21L, the brake shoe 19L of 21R, 19R is brought into contact with the reel disks 12L, 12R, and each reel disk 12L, Rotation of 12R is prohibited (state in Fig. 4). In this braking state, the brake shoes 19L and 19R are in the lead position. When the braking torque increases due to sliding contact with the reel discs 12L and 12R in the Brake shoe arms 21L and 21R may rotate and cause the tape to break. Prevent excessive torque from occurring.

[0017] Further, when the solenoid 40 is energized, the solenoid 40 operates the plunger. The intermediate arm 35 swings counterclockwise in FIG. The center plate 17 is displaced to the right in FIG. Brake shoes 19L, 19R are connected to the reel disc 12L, 12R, and brake each reel disc 12L, 12R. Release and allow rotation (state in Figure 1).

[0018] On the other hand, in this brake mechanism, each brake arm 15L, 15R is attached to the support pin 14. The supporting pin 14 is inserted through the center plate 17 to center the It is also used as a guide pin for the plate 17. For this reason, each brake arm 15L , 15R does not require a separate support pin, and also does not require a separate support pin for guiding the center plate 17. This eliminates the need for multiple guide pins, reducing the number of parts. The area in which the arms 15L, 15R, etc. are arranged can be reduced, allowing for miniaturization. .

[Effect of the idea]

As explained above, the brake mechanism of the magnetic recording/reproducing device according to this invention If so, install a support pin between the two reel discs, and attach each reel disc to this support pin. Supports two brake arms for disc braking in a swingable manner, and also supports a support pin. Pass through the slide member for driving the brake arm, and use the support pin to secure the slide member. Since the movement is guided, the number of parts can be reduced, and the size is smaller. It is also possible to achieve

[Brief explanation of drawings]

FIG. 1 is a plan view of a brake mechanism of a magnetic recording/reproducing device in an inoperative state according to an embodiment of the present invention.

[Figure 2] A perspective view of the main parts of the brake mechanism

[Figure 3] Exploded perspective view of the main parts of the brake mechanism

[Figure 4] Plan view of the operating state of the brake mechanism

[Explanation of symbols]

11... Chassis, 12L... Supply reel disc (reel stand), 12R... Take-up reel disc (reel stand), 14... Support pin, 15L, 15R... Brake arm, 17...・Center plate (slide member), 19L, 19R... Brake shoe, 40... Solenoid.

Claims (1)

[Scope of utility model registration request] Claim 1: A reel machine comprising a pair of left and right reel stands disposed on a chassis, and two left and right brake arms swingably supported in the vicinity of the reel stands, each of which has a brake arm corresponding to the reel stand. In a brake mechanism for a magnetic recording and reproducing device that brakes the rotation of reel stands by frictional contact, support pins are provided on the chassis at positions equidistant from the pair of left and right reel stands, and the two The brake arm is swingably supported, and a slide member is provided which is guided and displaced by the support pin, and displacement of the slide member in one direction drives the pair of brake arms to swing. A brake mechanism for a magnetic recording/reproducing device.