JPH06267228A - Leaf spring fixing device for reel support of video cassette - Google Patents

Abstract

PURPOSE:To provide a fixing device which can automatically fix a leaf spring to an upper shell of a video cassette with high accuracy. CONSTITUTION:This fixing device is provided with a welding head 77 of an ultrasonic welding machine freely movably relative to a pin 8 formed on the inside surface of an upper shell 2 intermittently transferred at a specified stroke in one direction in a position where this upper shell 2 stops. The rear surface of a spring retainer 81 which moves upward and downward cooperatively with this welding head 77 and is pressed downward by a spring 86 is provided with a fitting groove 82 into which a bent piece 6 of the leaf spring 4 supported by this pin 8 is fittable. The base of this fitting groove 82 is formed as a slope 83 having an angle of inclination equal to the bending angle of this bent piece 6. A permanent magnet 85 which attracts the bent piece 6 is embedded in this slope 83. The welding head 77 and the spring retainer 81 are concurrently lowered while the upper shell 2 is held stopped. The bent piece 6 of the leaf spring 4 is moved along the slope 83 of the fitting groove 82 by the attraction of the permanent magnet 85 attached to the spring retainer 81, by which the leaf spring 4 is held to the specified direction and posture. The front end of the pin 8 is then ultrasonically welded by the welding head 77. The leaf spring 4 is thus fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring fixing device for elastically pressing a tape reel of a video cassette.

[0002]

2. Description of the Related Art As shown in FIGS. 15 and 16, in a video cassette A, a cassette case 1 is formed by an upper shell 2 and a lower shell 3, and a pair of leaf springs 4 is formed on the upper shell 2. The pair of tape springs 4 are attached and elastically press the pair of tape reels 5 assembled in the cassette case 1.

Here, the leaf spring 4 has a bending piece 6 at one end and a pin hole 7 at the other end, as shown in FIG.
Is provided. This leaf spring 4 has pin holes 7 fitted into a pair of pins 8 formed on the inner surface of the upper shell 2,
It is fixed to the upper shell 2 by ultrasonically welding the tip of the.

In mounting the leaf spring 4 as described above,
If the tip of the bent piece 6 of the leaf spring 4 pushes the eccentric position with respect to the center of the end face of the tape reel 5, the support of the tape reel 5 becomes unstable, and the tape is mounted on the cassette mounting portion of the video camera or deck. When the video cassette A is mounted, the tape reel 5 is tilted, which causes a trouble.

For this reason, it is necessary to mount the leaf spring 4 with high precision so that the tip of the bent piece 6 presses the center of the end face of the tape reel 5, which is very time-consuming.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixing device for a leaf spring for reel support, which can fix the leaf spring with extremely high precision and automatically.

[0007]

In order to solve the above problems, in the present invention, a leaf spring having a bent piece at one end and a pin hole formed at the other end is provided on the inner surface of the upper shell. A fixing device which is attached to a formed pin, and ultrasonically welds the tip of the pin to a plate spring to fix the plate spring, which is transferred in one direction with the plate spring attached to the pin. A leaf spring fixing station is provided in the transfer path, and the welding head of the ultrasonic welding machine is provided to be movable up and down with respect to the pin of the upper shell that is fed to the leaf spring fixing station and stopped. At the same time, a fitting groove into which the bent piece of the leaf spring can be fitted is formed on the lower surface of the spring retainer that elastically presses the other end of the leaf spring, and the bottom surface of the fitting groove is bent at the bending angle of the bent piece. Provide an inclined surface that is inclined at an angle substantially equal to
A structure was used in which a permanent magnet that attracts the bent piece was embedded in the inclined surface.

[0008]

In the fixing device having the above structure, when the upper shell is fed to the plate spring fixing station and stopped, the welding head and the spring retainer are lowered, and the spring retainer elastically moves the other end of the leaf spring. Before pressing, the bent piece of the leaf spring is attracted by the attraction force of the permanent magnet, the bent piece is fitted in the fitting groove, and the bent head is attached to the inclined surface by the welding head. The tip portion is ultrasonically welded to fix the leaf spring.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, both sides of the upper shell 2 forming the cassette case are guided by a pair of parallel guides 10 by the operation of a conveying device (not shown), and the upper shell 2 moves from the left side to the right side in FIG. A leaf spring supply station X and a leaf spring fixing station Y are sequentially provided on the transfer path.

A turntable 11 is provided on one side of the leaf spring supply station X, and the turntable 11 is provided.
A pair of stockers 12 for holding the leaf springs 4 in a stacked state are provided on the outer peripheral portion of the upper surface of the pair at equal intervals in the circumferential direction.

The turntable 11 is index-rotated by a rotating device (not shown) so that a set of stockers 12 faces the transfer path of the upper shell 2.

FIG. 4 shows details of the stocker 12. The stocker 12 includes two guide bars 1 on the upper surface of the support plate 13.
4 and 14 are provided at intervals corresponding to the width dimension of the leaf spring 4, and the support pin 1 is provided behind the guide bars 14 and 14.
5 is provided in a protruding manner. The leaf spring 4 is stacked between the two guide bars 14 and 14 so that the support pin 15 is inserted into the pin hole 7.

The support plate 13 of the stocker 12 has two guide grooves 1 extending in the radial direction provided on the turntable 11.
The interval between the pair of stockers 12, 12 supported by the guide grooves 16 so as to be freely inserted into and removed from each of the six pins 6 is equal to the interval between the pair of pins 8 provided on the inner surface of the upper shell 2. .

The leaf springs 4 supported by the stocker 12 are taken out one by one from the upper portion by the operation of the suction conveyance device 20 and are fed into the upper shell 2 stopped at the leaf spring feeding station X.

2 and 3 show the details of the suction conveyance device 20. In this suction conveyance device 20, two rails 22 extending vertically are provided in parallel on a side surface of a column 21, and a turntable 11 is provided between a pair of side plates 24 of an elevating member 23 supported so as to be vertically movable along the rails 22. Two guide bars 25 extending from above to above the leaf spring supply station X are provided up and down, and a carriage 26 movably supported along the guide bars 25 is vertically moved to the front side opposite to the leaf spring supply station X. The guide blocks 27 facing each other are provided on the left and right, and the suction head 2 is attached to the lower ends of the two guide shafts 28, 28 slidably supported by the upper and lower guide blocks 27.
9 and 29 are attached, the guide shafts 28 and 28 are pulled down by a spring 30, and a stopper 31 attached to the upper ends of the guide shafts 28 and 28 is brought into contact with the upper surface of the upper guide block 27.

Here, the pair of suction heads 29, 29 are
Each of the suction holes 3 has a suction hole 32 opened on the lower surface.
The suction force is applied to 2 by a suction device (not shown). The distance between the suction heads 29, 29 is equal to the distance between the pair of stockers 12, 12.

In the suction conveyance device 20, the pair of suction heads 29, 29 are vertically moved and horizontally moved by the vertical movement of the elevating member 23 and the horizontal movement of the carriage 26. The uppermost leaf spring 4 in 12 is adsorbed and transferred to the upper shell 2 that stops at the leaf spring supply station X, and each plate is placed outside the pair of pins 8 provided on the inner surface of the upper shell 2. The pin hole 7 at the other end of the spring 4 is fitted.

Here, in order to move the elevating member 23 up and down, a guide groove 34 is provided in the roller guide 33 attached to the elevating member 23, while a bracket 35 attached to the upper end of the column 21 is provided with a pin 36 in the roller arm. A roller 38, which is rotatably supported in the middle of 37, is attached to one end of the roller arm 37, is inserted into the guide groove 34, and a rod 39 connected to the other end of the roller arm 37 is moved up and down to move the roller arm 37. Is oscillated to move the elevating member 23 up and down.

In order to move the carriage 26 horizontally,
A shaft 40 is provided so as to project from the lower portion of the side surface of the support column 21, and a roller 42 is provided at one end of an L-shaped roller arm 41 that is swingably supported about the shaft 40.
6 is inserted into a groove 44 extending in the vertical direction of a guide block 43 attached to the inner surface of 6, and the roller arm 41 is rocked by vertical movement of a rod 45 connected to the other end of the roller arm 41 to horizontally move the carriage 26. I am trying to move it.

The upper shell 2 stopped at the leaf spring supply station X is positioned by the operation of the positioning device 50 provided on the station X.

As shown in FIGS. 2 and 5, the positioning device 50 is provided with a support plate 51 on the other side of the leaf spring supply station X, and the support plate 51 has two guide cylinders 52, 5 attached thereto.
2 is fixed, the positioning pin 53 slidably inserted in each of the guide cylinders 52, 52 is pressed downward by a spring 54 provided outside thereof, and a roller receiver 55 is fixed to the upper part of the positioning pin 53. A roller 57 attached to one end of a roller arm 56 is engaged with the lower surface of the roller receiver 55, and the other end of the roller arm 56 is fixed to a shaft 58 supported by a bracket 57 on the upper and lower support plates 51. Also, a lever 59 is fixed to the end of the shaft 58, and the lever 5
The vertical movement of the rod 60 connected to the roller arm 5
6 is rocked.

The positioning device 50 includes a roller arm 56.
When one end portion of the locator 1 swings downward, the pair of positioning pins 53 are lowered by the elastic force of the spring 54, and the lower end portion of each locating pin 50 is recessed in the upper shell 2.
1 is inserted (see FIG. 6).

As shown in FIG. 1, the leaf spring fixing station Y is provided with an ultrasonic welding device 70 for fixing the leaf spring 4 by ultrasonically welding a pair of pins 8 provided on the upper shell 2. There is.

7 to 9 show details of the ultrasonic welding device 70. This ultrasonic welding device 70 has the station Y of a column 71 provided on one side of the leaf spring fixing station Y.
A rail 72 that extends vertically is provided on the front surface that faces the rail guide 74, and a rail guide 74 is attached to the front surface of an elevating table 73 that is supported to rise and lower along the rail 72.
An ultrasonic welding machine 76 having a rail 75 guided by 4 is supported so as to be able to move up and down.

Here, the ultrasonic welding machine 76 is used for the welding head 7.
7 is provided on the lower surface, and a pair of protrusions 78 for simultaneously welding the pair of pins 8 of the upper shell 2 are provided on the lower surface of the welding head 77 at equal intervals to the pair of pins 8.

Also, the bracket 7 is attached to the ultrasonic welding machine 76.
8 is attached to the bracket 78, two guide cylinders 79 and 79 are attached to the bracket 78, and spring retainers 81 and 81 are attached to the lower ends of the guide shafts 80 and 80 slidably inserted in the guide cylinders 79 and 79, respectively. Has been.

The spring retainer 81 has a fitting groove 82 on the bottom surface into which the bent piece 6 of the leaf spring 4 can be fitted, and the bottom surface of the fitting groove 82 descends toward the projection 78 of the welding head 77. It is an inclined surface 83 having. The inclination of the inclined surface 83 is equal to the bending angle of the bent piece 6 of the leaf spring 4, and the permanent magnet 85 is embedded in the hole 84 formed in the inclined surface 83.

Here, the spacing between the fitting grooves 82, 82 formed in the pair of spring retainers 81, 81 is equal to the spacing between the projections 78 provided on the lower surface of the welding head 77.

The guide shaft 80 is pressed downward by a spring 86 provided outside the guide shaft 80,
The stopper 87 attached to the upper end of the bracket is pressed against the upper surface of the bracket 78. The stopper 87 has a guide hole 88.
A pin 89 provided on the upper portion of the guide cylinder 79 is inserted into the guide hole 88, and the pin 89 prevents the guide shaft 80 from rotating.

A pair of positioning pins 90 are slidably supported by the bracket 78, each positioning pin 90 is pressed downward by a spring 91, and a stopper 92 provided above the positioning pin 90 is provided on the bracket 7.
It is pressed against 8.

In the ultrasonic welding apparatus 70, the positioning pin 90 is attached to the shell connecting screw cylinder 93 of the upper shell 2 which is stopped at the leaf spring fixing station Y by the descending of the elevating table 73 and the descending of the ultrasonic welding machine 76. The lower end is inserted to position the upper shell 2, and the leaf spring 4 supported by the pin 8 is positioned by the spring retainer 81. With the upper shell 2 and the leaf spring 4 positioned, the pair of protrusions 7 of the welding head 77 are positioned.
At 8, the tips of the pair of pins 8 are welded.

Here, in order to lower the elevating table 73, a rod 94 is connected to the elevating table 73 and the rod 94 is moved up and down by a cam mechanism.

In order to lower the ultrasonic welding machine 76, a cylinder 95 is supported by an elevating table 73, and the piston lot 96 of the cylinder 95 is connected to the ultrasonic welding machine 76.

10 to 14 show the operating state of the fixing device having the above structure.

As shown in FIG. 10A, when the upper shell 2 is fed into the leaf spring supply station X and stopped,
By the operation of the positioning device 50 shown in FIG. 5, the pair of positioning pins 53 descend to position the upper shell 2.

On the other hand, the pair of suction heads 29 of the leaf spring suction / transport device 20 shown in FIGS. 2 and 3 vertically move and move horizontally to suck the bent piece 6 of the leaf spring 4 held by the pair of stockers 12. And transfer it into the upper shell 2 as shown in FIG.
The pin hole 7 at the other end of the leaf spring 4 is fitted into the pair of pins 8 as shown by the chain line.

FIG. 10B shows a state in which a pair of leaf springs 4 are supplied into the upper shell 2, and the bent pieces 6 of each leaf spring 4 are placed in a state of overlapping with the inner surface of the upper shell 2 to form a leaf spring. The other end of 4 is inclined.

When the leaf spring 4 is supplied, the positioning device 5
The positioning pin 53 of 0 rises to release the positioning, and at the same time when the positioning is released, the upper shell 2 is transferred to the next leaf spring fixing station Y.

The next upper shell 2 is fed to the leaf spring supply station Y, and the leaf spring 4 is supplied in the same manner as described above.

When the upper shell 2 is fed to the leaf spring fixing station Y and stopped, the elevating table 73 shown in FIG. 7 descends, and when the elevating table 73 descends by a predetermined amount and is held in a stopped state, the cylinder 95 is stopped. Is activated to lower the ultrasonic welding machine 76.

By lowering the ultrasonic welding machine 76, FIG.
As shown in, the lower ends of the pair of positioning pins 90 are inserted into the screw cylinder 93 to position the upper shell 2. At this time, there is a required space between the spring retainer 81 and the bent piece 6 of the leaf spring 4, and the spring retainer 81 further descends from that state.

As shown in FIG. 12, when the lower end of the inclined surface 83 of the fitting groove 82 of the spring retainer 81 is lowered to the position just before contacting the leaf spring 4, the permanent magnet 85 causes the bent piece 6 of the leaf spring 4 to move. Adsorb. Due to the suction, the bent piece 6 is fitted into the fitting groove 82.
It is fitted inside and overlaps the inclined surface 83, while the other end of the leaf spring 4 is held in parallel with the inner surface of the upper shell 2.

When the lower end of the inclined surface 83 descends to the position where it abuts against the other end of the leaf spring 4, the spring retainer 81 stops, and the other end of the leaf spring 4 is pressed against the upper surface of the upper shell 2 to make surface contact. To be kept

At this time, there is a space between the pair of protrusions 78 of the welding head 77 and the pair of pins 8. The welding head 77 further descends from that state and ultrasonically welds the tip portion of the pin 8 as shown in FIG.

At this time, the projection 78 of the welding head 77
Has a possibility of ultrasonically welding the pin 8 under pressure and deforming the upper shell 2 by the pressure, so that as shown in FIG. 13, a support base 97 is provided between the guides 10 to fix the upper shell 2 to the upper shell 2. It supports and prevents the upper shell 2 from being deformed.

During the high frequency welding of the pin 8 as described above, the bent piece 6 of the leaf spring 4 is held in a state of overlapping with the inclined surface 83 of the fitting groove 82 so that the orientation and the posture thereof are constant. The high frequency welding of the pins 8 allows the leaf spring 4 to be attached with extremely high accuracy.

[0048]

As described above, according to the fixing device of the present invention, the bent piece of the leaf spring is held in an inclined state by the spring retainer, and the other end of the leaf spring is brought into close contact with the inner surface of the upper shell. Since the pins are high-frequency welded in this state, the leaf spring can be fixed with extremely high precision.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a fixing device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view showing the above leaf spring stocker.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10A is a cross-sectional view showing a supply state of a leaf spring to the upper shell, and FIG. 10B is a perspective view of the upper shell to which the leaf spring is supplied.

FIG. 11 is a sectional view showing an operating state of fixation of the leaf springs of the above.

FIG. 12 is a sectional view showing an operating state of fixation of the leaf springs of the same.

FIG. 13 is a cross-sectional view showing an operating state of fixation of the leaf springs of the same.

FIG. 14 is a perspective view of an upper shell to which a leaf spring is fixed.

FIG. 15 is a partially cutaway front view of the video cassette.

16 is a sectional view taken along line XVI-XVI in FIG.

[Explanation of symbols]

 2 Upper shell 4 Leaf spring 6 Bending piece 7 Pin hole 8 Pin 76 Ultrasonic welding machine 77 Welding head 81 Spring retainer 82 Fitting groove 83 Inclined surface 85 Permanent magnet

Claims (1)

[Claims] 1. A leaf spring having a bent piece at one end and a pin hole formed at the other end is attached to a pin formed on the inner surface of the upper shell, and the tip of the pin is ultrasonically welded. A fixing device for fixing a leaf spring to a leaf spring, the leaf spring fixing station being provided in the transfer path of the upper shell, which is transferred in one direction with the leaf spring attached to the pin, and fed to the leaf spring fixing station. The welding head of the ultrasonic welding machine is provided so as to be able to move up and down with respect to the pin of the upper shell that stops, and moves up and down together with the welding head, and on the lower surface of the spring retainer that elastically presses the other end of the leaf spring when descending. Forming a fitting groove into which a bent piece of a leaf spring can fit, and providing a bottom surface of the fitting groove with an inclined surface that is inclined at an angle substantially equal to the bending angle of the bent piece, the bent surface is bent. Reel support for video cassettes with embedded permanent magnets that attract pieces Plate spring fixing device.