JPS60125954A - Pinch roller pressing device - Google Patents

Abstract

PURPOSE:To attain a compact and light-weight design for a pinch roller pressing mechanism by using a cam mechanism to press the pinch roller to a capstan as well as for loading of a magnetic tape. CONSTITUTION:When a cam gear 126 is turned toward an arrow FB, a cam pin 124 fixed to a lever 120 moves along a cam groove 128. While a pinch roller carry stage 108 is turned around a rotary shaft 114 and at the same time a pinch roller arm 106 is turned around a rotary shaft of a tape guide roller 110. Thus a video tape 102 is drawn out of a cassette 100 and loaded to a head drum. When the gear 126 is turned more and a cam pin 134 passes through a peculiar point C of the groove 128, a carry stage 140 is turned counterclockwise. Then a roller 160 provided to a pressing lever 146 touches the end part of the arm 106, and a pinch roller 104 is turned clockwise. Then the lever 146 is separated from a stop lever 158. Then the roller 104 is pressed to a capstan 132 via the tape 102 with the contracting force of a spring 154.

Description

[Detailed Description of the Invention] [Contact Field of the Invention] The present invention relates to a pinch roller crimping device,
In particular, the present invention relates to a pinch roller pressing device for a helical scan type magnetic tape recording/reproducing device, such as a video tape recorder.

[Prior art]

The running of magnetic tapes, such as video tapes, is generally carried out using a combination of capstans and pinch rollers. In conventional video tape recorders, the pinch roller is moved toward the capstan by a plunger, or the pinch roller is pressed against the capstan by a link mechanism.

First, let me explain the U loading method adopted in the β method, as shown in the first prisoner.

Video tape cassette (hereinafter simply referred to as "cassette")
10, the pinch roller 12 is located inside the videotape 14, that is, on the cassette 10 side of the videotape 14. The pinch roller 12 is disposed on a loading gear 16, and a head drum 18 containing a magnetic head for recording and reproducing is disposed within the loading gear 16. That is, when the loading gear 16 is rotated, the pinch roller 12 moves while resting on the outer periphery of the head drum 18. A capstan 20. Link mechanism 22 and Granger 24
are arranged respectively.

When the loading gear 16 rotates in the direction of arrow F1, the pinch roller 12 also moves, and the video tape 14 comes into contact with the outer circumferential side of the head drum 18 to perform loading. A mulink mechanism 22 that stops at a position where the pinch roller 12 approaches the capstan 20 is connected to the pinch roller 1.
2.

When the plunger 24 is driven in the direction of arrow F2 in this state, the link mechanism 22 rotates to the left about the fulcrum 26)k, and the pinch roller 12 is pressed against the capstan 20. That is, as the plunger 24 operates, the pinch roller 12 is pressed against the capstan 20 and released.

FIG. 2 shows the M loading method employed in the ■S method. In this figure.

When the cassette 50 is installed, the capstan 520--de-roller 54,56 are located inside the videotape 58. Pinch roller 60 is disposed at one end of linkage 62 and is located close to capstan 52 . One end of the link mechanism 62 is connected to a cam lever 64 via a spring.

The videotape 58 is moved along the outer periphery of the head drum 66 along arrows F5. Loading roller familiar like F4.

jJ) is loaded when 56 moves. When the cam lever 64 moves in the direction of the arrow F5, the pinch roller 6o (by the action of the sliding mechanism 62) moves Φ'r :j
, /n 52. In the above method, in which a plunger can be used in place of the cam lever 64, the position of the pinch roller 6o should change even during tape loading. Since it is formed independently from the main unit, the space required for installation is large. In addition, when the pinch roller crimping mechanism includes a plunger, a large installation space is required for one plunger, and the weight is also large.Furthermore, when the pinch roller crimping mechanism includes a gear or a lever, Similarly, the installation space and weight increase.

Particularly recently, a camera-integrated video tape recorder (referred to as "TRSM video") has been proposed from the viewpoint of operation method and portability. In this 8111 video, it is necessary to reduce the weight of various mechanisms.
[Summary of the Invention] The present invention has been made in view of the above points, and is designed to reduce the size of the pinch roller crimping device as a whole. The purpose is to provide a pinch roller crimping device that is light in weight and suitable for 8mm video. The aim is to achieve the above objective by using the cam machine Sakaki without any problems.

[Embodiments of the invention]

Hereinafter, regarding the pinch roller crimping device according to the present invention,
Embodiments will be described in detail with reference to embodiments shown in the accompanying drawings.

FIG. 3 shows an embodiment of the pinch roller crimping device according to the present invention. In this figure.

When the cassette 100 is installed, the video tape 1
A pinch roller 104 is located inside the roller 02.

The pinch roller 104 is pivoted to one end of an oval-shaped pinch roller arm 106, and the approximately central portion of the pinch roller arm 106 is pivoted to a pinch roller carrier 108 together with a tape guide roller 110. ing.

The axis of the pinch roller 104 is in contact with the edge of the oval-shaped guide 112, and moves along the edge.

The pinch roller carriage 108 is rotatable in a clockwise direction about a rotating shaft 114 near the right end in FIG.
This rotation is regulated by a stopper 116. One rotation shaft 11 is attached to the upper inclined edge of the pinch roller carrier 108.
A vinyl A22 provided at one end of an abbreviated lever 120 rotatable about 8 is in contact with the lever 120. Also,
A cam pin 124 provided at the other end of the lever 120 is formed on a cam gear 126 and fitted into a cam groove 128.
- The cam gear 126 has gears formed around one side as shown in FIG. 4, and is rotated around a central axis 160. Further, the cam groove 128 has singular points A and B.

The cam grooves 128 between the singularity openings C and D and E are circular arcs with a constant radius centered on the central axis 160. Between the cam groove 128 and the singularity B, the video tape 102 is transferred to cassette 1.
Between singular point B and 0, 1 is placed on the other loading post (not shown) for loading the video tape 102 into a cylinder head or head drum (not shown). Between the singular point C and 0, the pinch roller 104 is used to press the capstan 162 (described later) to record or reproduce data, especially video data.
The pauses are for special modes such as high-speed rewinding. In addition to the cam pin 124 described above, a cam pin 164 is slidably fitted into the cam groove 128.

A spring 166 is locked between one end of the pinch roller carrier 108 and an anchor pin, and the pinch roller carrier 108
is pushed in by a pin 122 fixed to a lever 120, as shown in FIG. 3, against the contractile force of a spring 166 which attempts to draw out the carriage 108Y. Further, the pinch roller arm 106 is given the habit of rotating in the direction of arrow FB around the rotation axis, that is, the rotation axis of the tape guide roller 110, and is in contact with the guide 112.

Next, the carriage 140 that rotates around the rotating shaft 138 is arranged on the lower blade of the carriage 140 via a cam pin 164 provided to protrude below the carriage 140 and a cam groove 128. The cam gear 126 is connected to the cam gear 126. The platform 140 is provided with rotating shafts 142 and 144, respectively. An IE crimping bar 146 is fixed to the rotating shaft 142, and a spring hook 148 is fixed to the rotating shaft 144.A fixed pin 15 is fixed to the crimping lever 146.
0 is provided on the lever 148, and a fixing pin 152 is provided on the lever 148), and these fixing pins 150
, 152, a compression spring 154 is hung between them.

On the other hand, the spring hook has an adjustment screw 15 at one end of the lever 148.
6 is provided, which causes the compression spring 1EA61
KK 2k →1 f ++ , J-φ-ct=kou
1M /lt Jinzui L(r AZ ri; ?+ J-
412 Due to the action of this compression spring 154, the compression lever 14
6, the spring catch is given a pivoting habit about the axis of rotation 142 in the direction of the lever 148. This rotation.

It is regulated by a stopper 158. A roller 160 is provided on the opposite side of the pressure lever 146 from the rotating shaft 142.
is provided.

Note that a gear 162 is provided at an appropriate position on the outer circumference of the cam gear 126.
．． 164 are arranged in mesh with each other, and when these gears 162 and 164 rotate, a loading mechanism (not shown) operates. This mechanism may be a known mechanism.

Next, the overall operation of the above embodiment will be explained.

First, when the tape cassette 100 is installed, a pinch roller 10 is placed inside the video tape 102, as shown in FIG.
4 will be located. In this state, the cam pin 124 is positioned at the % tool point A of the cam groove 128, and the pin 154 fixed to the carriage 140 is positioned at the cam u12.
It is on the way between the singularity of 8 and 0.

When the cam gear 126 rotates in the direction of arrow FB force, lever 1
9. Fixed to 20. The cam pin 124 is inserted into the cam groove 128.
, and reaches the singular point B as shown in FIG.

On the other hand, the pinch roller carriage 108 rotates around the rotating shaft 114. That is, the platform 108 is.

The lever 120 rotates clockwise while pressing its edge against the bottle 122 fixed to the lever 120. This action is caused by the spring 166
Due to the contraction force of. This rotation is caused by the pinch roller carriage 108
ends when the edge of the tape comes into contact with the stopper 116, resulting in the state shown in the fifth factor. Rotate and move as guided by. As a result, the videotape 102 is pulled out from the cassette 100.

Next, when the cam gear 126 further rotates in the direction of arrow f'B, the gears 162 and 164 rotate, thereby driving a tape loading gear (not shown), and the other side of the video tape 102 is pulled out from the cassette 100 and placed on the head drum. is loaded against. In addition, during this time, the cam pin 124 fixed to the lever 120,
The Kamhi y134 fixed on the platform 140 is the singularity C
Since the beam does not pass through the area, there is no change in relative positional relationship.

When the cam gear 126 further rotates in the direction of arrow FB, the cam pin 164 passes through the singular point C of the cam groove 128. Therefore, the cam pin 164 moves between the singular points C and 0 of the cam groove 128, reaches the position shown in FIG. Will have to move.

In this operation, the pinch roller 160 provided on the pressure lever 146 comes into contact with the end of the pinch roller arm 106,
The pinch roller 104 rotates clockwise and approaches the capstan 162 via the video tape 102.

When the platform 140 further rotates, fE resists the spring 154.
The donning lever 146 is pulled away from the stopper 158.
As a result, the contractile force of the spring 154 is applied to the pinch roller 104 and the capstan 1 via the pinch roller arm 106Y.
62 and 6 pinch rollers 104 press the capstan 1621 through the videotape 102. That is, the pinch roller 104 is loaded with a pressing force corresponding to the amount of extension of the spring 154 at the position shown in FIG.

From f(IJ 5, cam pin 1 provided on the platform 140
By rotating the cam gear 126Y so that the cam gear 64 moves between the singular point C and 0 of the cam groove 128, the pinch roller 104 can be easily repeatedly pressed against and released from the capstan 162.

Furthermore, from the state shown in FIG.
When rotated in the direction 7j, the cam pin 164 engages the cam groove 12.
The singularity E of 8 is reached. This allows various operations to be performed while maintaining the above-mentioned state. for example,
By providing an outer circumferential cam at the lower part of the upper gear of the cam gear 126, operations such as releasing the pack tension stabilizer when the video tape 102 is stably reversed (the tape is sequentially fed) or loading the pack tension on the take-up reel can be performed. It can be performed.

In addition, in the method where the capstan is located outside the cassette case (adopted in the β method), in the M loading force method shown in Figure 2 (adopted in the 4S method), the capstan is located inside the cassette case. . However, even with this method, the position of the capstan can be changed to outside the cassette case, and the above embodiment can be applied. Further, in the above embodiment, the capstan is located outside the cassette case, but the present invention 8J'J is not limited to the above embodiment.

It can also be applied to a platform where the capstan is located inside the cassette case.

In addition, in the above embodiment, one continuous cam groove with multiple singularities is provided on one cam plate, and two cam pins are engaged with this cam groove. It is also possible to provide two discontinuous cam grooves on the cam plate and engage the cam pin in each of them, or to provide two cam plates and have a cam groove in each of them and engage the cam pin in the cam groove. .

〔Effect of the invention〕

In ↓5 explained above, the pinch row J511 according to the present invention
? :ZenmKuJ7 r hW -b l-#Iim k
Since the operations of IJ-/force fh mi recorder combination, loading of tB air tape, and crimping of pinch rollers are performed in the same mechanism five times in succession, the installation space is reduced as a whole, and a plunger is used. This has the effect of reducing weight.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a pinch roller crimping device in the β method, FIG. 2 is a plan view showing an example of a pinch roller crimping device in the VH8 method, and FIG. 3 is a plan view showing an example of the pinch roller crimping device according to the present invention. FIG. 4 is a plan view showing an example of the configuration of a cam gear, and FIGS. 5 and 6 are plan views showing the pinch roller crimping device in an operating state. In the figure, 100 is a cassette), 102 is a video tape, 104 is a pinch roller, 106 is a pinch roller arm, 108 is a pinch roller carriage, 124, 134 are cam pins, 126 is a cam gear, 128 is a cam groove, 1324!
Capstan, A = B m Ca De E is a singularity. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Patent Attorney Sanro Kimura Figure 2 U Figure 5

Claims (1)

[Claims] 1. A pinch roller crimping device that crimps a pinch roller against a capstan via a magnetic tape. a cam mechanism including a cam plate, a cam groove provided in the cam plate, and first and second cam pins that engage with the cam groove; and a cassette according to the movement of the first cam pin as the cam plate rotates. Magnetic tape puller to pull out the magnetic tape from
A pinch ruler crimping device characterized in that it is equipped with: a pinch roller control mechanism that presses and releases the pinch roller against the capstan in accordance with the movement of the $2 cam pin due to the rotation of the cam plate; and Y. 2. The cam mechanism has two independent cam flows Muψgebi, -aaθ] cam flow number r 砺Taself coarse 1 on one cam plate.
2. The pinch roller crimping device according to claim 1, wherein the cam pin and the second cam pin are engaged with each other. &The cam mechanism is characterized in that a single cam plate is provided with one continuous cam groove having a plurality of singular points, and the first and second cam pins are engaged with the cam groove. A pinch roller crimping device according to claim 1.