JPS5847585Y2 - Inspection device for transparent windows in magnetic tape cartridges - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an inspection device for checking whether there is a manufacturing defect in the transparent window of a magnetic tape cartridge.

That is, in a video magnetic tape cartridge as shown in FIG. 1, the upper and lower plastic half-cases 1a and 1b constituting the main body case 1 are screwed together with their lids mating, and the magnetic tape 2 is wound inside the left and right sides of the pair. It has built-in tape reels 3 and 3, and the upper half case 1a
The amount of tape wound on each reel 3 can be seen from the outside through transparent windows 4 provided on the left and right sides of the reel 3.

The transparent window 4 generally has a structure in which the outer periphery of a plastic transparent plate 6 is adhesively fixed by ultrasonic welding to the inner periphery of an opening 5 transparently provided in the half case 1a, as shown in FIG. However, the problem with this is poor adhesion of the transparent plate 6.

Such adhesion failures occur due to warping deformation during plastic molding of the half case 1a and the transparent plate 6, and poor contact with the ultrasonic welding horn.

Conventionally, this point has been overlooked, and after commercialization, the transparent plate 6 may come off due to stress from the outside, or even if it does not, a gap may be created in the transparent window 4 and dust may enter the main body case through this gap. There were complaints that people were trespassing inside.

This invention has focused on this fact and is intended to provide an inspection device that can check for poor adhesion of the transparent plate to the half case when assembling a magnetic tape cartridge.

The details will be explained below with reference to the drawings. The inspection device is attached to a magnetic tape cartridge assembly line.

In FIG. 3, the main inspection device basically consists of an assembly line L in which the half case 1a, in which the transparent window 4 is formed as described above, is guided and run with its inner surface facing upward; Holding means 1 for holding the half case 1a by suction
0, a drive means 20 for guiding and moving the holding means 10 to an inspection position A set laterally outward of the assembly line L, and an inspection mechanism 30 disposed at the inspection position.

The half case holding means 10 includes a vacuum suction tool 12, four pressing rods 13, and two knockout rods 14, which are provided on the lower surface of a head plate 11 and projecting downward.

The vacuum suction tool 12 has four suction rods 16 fixed to a joint block 15 fixed to the lower surface of the head plate 11, a rubber cup 17 attached to the lower end of each suction rod 16, and an air intake path inside each suction rod. 16a are assembled in a joint block and connected to a vacuum source (not shown).

Band members 13a and 14a made of hard rubber are fixed to the lower ends of the pressing rod 13 and the knockout rod 14, respectively.

Further, the knockout rod 14 is supported by the joint block 15 so as to be able to slide up and down, and is biased downward by a weak spring 18.
The pad member 14a was made to protrude downward from the rubber cup 17 of the vacuum suction tool 12.

The inspection mechanism 30 includes a support member 31 supported and fixed to a frame 40 in a horizontal position, a total of eight detection rods 33 supported by the support member 31 via guide tubes 32 so as to be vertically slidable, and each detection rod 33. A spring member 34 that pushes up and biases the detection rod 33 upward, and a total of eight spring members that come into contact with the lower ends 33b of each detection rod 33 and operate individually when each detection rod 33 descends by a certain amount against the spring member 34. It consists of a switch 35.

Drive means 2 for reciprocating the half case holding means 10
0, a pair of upper and lower guide frames 21, 21 is fixed above the frame 40, and sliding frames 22, 22, which are slidable in the left and right direction, are horizontally supported on the guide frames 21, 21, and these sliding frames 21, 21 are horizontally supported. A sliding frame 24 is vertically and slidably supported on a vertical guide frame 23 fixed to the tips of the moving frames 22, 22, and ten head plates 11 of the holding means are fixed to the lower end of the sliding frame 24.

The first operating cylinder 25 drives the vertical guide frame 23 back and forth in the left-right direction, and the second operating cylinder 26 drives the head plate 11 back and forth in the up-down direction.

Next, the operation will be described. First, the holding means 10 descends toward the half case 1a that has been moved on the assembly line, and the vacuum suction tool 12 suctions and holds the half case 1a.

At this time, the knockout rod 14 hits the inner surface of the half case 1a and is pushed up against the spring 18, and the push rod 130
Pad member 13a contacts half case 1a.

These vacuum suction tools 12, knockout rods 14, and press rods 1
3 is in contact with a portion of the inner surface of the half case that does not interfere with the transparent windows 4, respectively.

Next, the holding means 10 holding the half case 1a by suction is raised by the operation of the driving means 20, horizontally moved to the left inspection position A, and then lowered.

As the holding means 10 is lowered, the tips 33a of all the detection rods 33 come into contact with the transparent plate 6 of each transparent window 4 of the nof case 1a, and each detection rod 33 is pushed down against the spring member 34.

Four detection rods 33 come into contact with the four corners of each transparent plate 6.

When each detection rod 33 is pushed down by a certain amount, the lower end 33b of each detection rod 33 presses the corresponding switch 35, and the switch 35 is turned on.

When all eight switches 35 in total are turned on, the adhesive strength of each transparent plate 6 is perfect.

However, if the adhesive strength of each transparent plate 6 is incomplete,
While the detection rod 33 is descending, as shown in FIG. 8, the defective adhesion part of the transparent plate 6 comes off upward from the periphery of the opening 5 due to the repulsive force of the spring member 34, and the detection rod 33 corresponding to this comes off from the periphery of the opening 5. The detection rod 33 does not descend further, and therefore the switch 35 corresponding to the detection rod 33 remains in the OFF state.

As a result, if at least one of the eight switches 35 is in the OFF state when the holding means 10 has been lowered by a predetermined amount at the inspection position A, it is determined that there is an adhesive failure in the transparent plate 6. .

Electric signals from these switches 35 actually activate warning lamps or buzzers, and defective products are removed based on this.

Incidentally, the half case 1a with the transparent plate 6 completely adhered is returned to the assembly line L again.

At this time, if only the vacuum pressure is released, there is a risk that the half case 1a will remain attracted by the residual pressure in the intake passage, but in this case, the knockout rod 14 is pressed down by the spring 18, so The half case 1a is pushed by the knockout rod 14, detached from the holding means 10, and returned to the assembly line L.

The illustrated video magnetic tape cartridge is of the type that has transparent windows 4 on both the left and right sides of the upper half case 1a, but there is also a type that has one transparent window 4 on one of the left and right sides of the upper half case 1a. Needless to say, this is the object of the present invention.

In addition, the present invention is not limited to video tape cartridges, but also covers audio Philips-type magnetic tape cartridges that have transparent windows 4, 4 on the upper and lower cases 1a and 1b and are used inverted.

Further, the transparent plate 6 may be bonded to the peripheral edge of the opening 5 with an adhesive instead of ultrasonic welding.

Furthermore, the transparent plate 6 may be adhered from the outside of the half case 1a.

Further, the half case 1a, which is sucked and held by feeding compressed air into the intake passage 16a of the holding means 10, can be removed from the holding means 10, and the knockout rod 14 may be omitted.

Alternatively, at least one detection rod 33 may be brought into contact with each transparent plate 6.

Further, in the illustrated example, after the holding means 10 is moved to the inspection position A by the driving means 20, the support member 31 that supports the detection rod 33 may be driven up and down.

Furthermore, as shown in FIG. 9, the inspection position A is set on the assembly line, and the half case 1a is held down by the holding means 10 from above the assembly line L, so that the inspection position A is detected below the assembly line L. The support member 31 of the rod 33 may be arranged to be movable up and down, and the support member 31 may be driven up and down by a driving means.

As explained above, according to this invention, the detection rod 33 is brought into contact with the transparent plate 6 in the direction in which the transparent plate 6 comes off from the half case 1a, thereby ensuring that the transparent plate 6 does not come into contact properly. can be detected and achieve the intended purpose.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an example of a magnetic tape cartridge to which the present invention is directed, and FIG. 2 is an end view taken along the T-line in FIG. 3 to 8 illustrate the inspection device according to the present invention, in which FIG. 3 is a schematic front view of the whole, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. V- in Figure 4
V-line sectional view, Figure 6 is a ■-■ line sectional view in Figure 4,
FIG. 7 is a sectional view taken along the line ■--■ in FIG. 3, and FIG. 8 is a front view of the main parts showing the operating state. FIG. 9 is a front view of main parts showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Main body case, 1a, 1b... - case, 4... Transparent window, 5... Opening, 6... Transparent plate, 10... Half case holding means, DESCRIPTION OF SYMBOLS 11...Head frame, 12...Vacuum suction tool, 13...Press rod, 20...Driving means, 30...Inspection mechanism, 31...
- Detection rod support member, 33...Detection rod, 33a...Tip of detection rod, 34...Spring member, 35...Switch, L...Assembly line.

Claims (9)

[Scope of utility model registration request] (1) Upper and lower half cases 1a that constitute main case 1
・Among the magnetic tapes 1b, a transparent window 4 is formed on at least the upper roof case 1a by adhering the outer periphery of a transparent plate 6 from one side of the inside and outside to the periphery of the opening 5 provided therethrough; Car 1 - In IJ Tsuji, half case 1a
, a support member 31 that supports the detection rod 33 movably forward and backward, the tip end 33a of which contacts the transparent plate 6 in a direction in which it is removed, and a support member 31 that urges the detection rod 33 to advance. a switch 35 that operates as the detection rod 33 moves backward by a certain amount, and a drive means that causes the half-case holding means 10 and the detection rod support member 31 to approach each other relatively and then to separate them. A transparent window inspection device characterized by (2) Magnetic tape cartridge or upper half case 1
The scanning device according to claim 1, which is a video magnetic tape cartridge having transparent windows 4 on the left and right sides of a. (3) The magnetic tape cartridge is located in upper half case 1.
The inspection device according to claim 1, which is a video magnetic tape cartridge having transparent windows 4 on the left and right sides of a. (4) The inspection device according to claim 1, wherein the magnetic tape cartridge is a Phillips type magnetic tape cartridge having transparent windows 4 in the upper and lower half cases 1a and 1b. (5) The inspection device according to claim 1, wherein a plastic transparent plate 6 is bonded to a plastic half case 1a by ultrasonic welding. (6) The inspection device according to claim 1 or 5, wherein a transparent plate 6 is adhered from inside to the inner peripheral edge of the opening 5 of the half case 1a. (7) The inspection device according to claim 1 or 5, wherein the transparent plate 6 is adhered from the outside to the outer peripheral edge of the opening 5 of the half case. (8) The inspection device according to claim 1, wherein the transparent plate 6 is bonded to the half case 1a with an adhesive. (9) The inspection device according to claim 1, wherein the support member 31 supports a plurality of detection rods 33 that come into contact with a plurality of locations on each transparent plate 6. 00) Assembly line L for guiding the half case 1a
A support member 31 that supports the detection rod 33 vertically is disposed in a fixed position on the lateral outer side of the frame, and is disposed above the assembly line L. The inspection device according to claim 1 or 9 of the utility model registration claim, which moves by moving. αυ The inspection device according to claim 10, wherein the half case holding means 10 includes means for sucking and holding the half case 1a on the assembly line. (The holding means 10 positions and fixes the half case 1ak on the assembly line L along which the half case 1a is guided and travels, and the support member 31 that supports the detection rod 33 vertically is arranged below the assembly line L. , the support member 3
1. The inspection device according to claim 1 or 9, wherein the inspection device 1 moves vertically and reciprocally by a driving means.