JPH04214281A - Tape cartridge - Google Patents

Abstract

PURPOSE:To prevent the electrification and heat accumulation of rollers by integrally molding a synthetic resin base plate of the tape cassette and the supporting shaft bases of metals erected with supporting shafts thereon and inserting the rollers onto these supporting shafts to form freely rotatable. CONSTITUTION:The supporting shaft bases 31 consisting of metallic disks are injection-molded by insert molding to the respective lower parts of the plural supporting shafts 24 at the time of injection molding the base plate 21 of the synthetic resin. The upper surface 31a of the supporting shaft bases 31 are molded flash with the upper surface 21a of the base plate 21 at this time. Radial fins 32 are integrally molded in the lower part of the base 31 and the fused synthetic resin is injected to the central holes 34 provided at the center of the bases 31 from the spacings 33 between the fins 32 to integrally mold the plural supporting shafts 24 on the base plate 21 and to integrally couple the bases 31 to the plate 21. The friction heat by belt driving rollers, etc., is radiated via the base 31 in this way and, therefore, the data error by the heating of a magnetic tape is prevented.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a tape cartridge which is most suitable for application to a data cartridge for high-density recording of CPU data. This relates to a prevention structure.

0002

2. Description of the Related Art A data cartridge for recording CPU data at high density is known, for example, in Japanese Patent Publication No. 14976/1983.

In this kind of data cartridge, as shown in FIG. 10, the cartridge 1 has a thin box-shaped upper cover 3, which is the upper half, screwed onto a base plate 2, which is made of metal such as an aluminum plate, which is the lower half. It is formed by doing the same. Moreover, the cover 3 has a horizontal top wall 3a, a vertical front wall 3b, a rear wall 3c, and left and right side walls 3d, which are integrally molded from a transparent synthetic resin. A pair of left and right tape reels 4 are rotatably supported on the base plate 2, and a magnetic tape 5, which is a tape, is wound around both reels 4. The magnetic tape 5 is guided by a pair of left and right tape guides 6 attached to the base plate 2, and is stretched along the rear side of the front wall 3b. Further, a belt drive roller 7 and a pair of left and right belt guide rollers 8 are rotatably supported on the base plate 2 at approximately the center on the front side and at approximately both right and left ends on the rear side. An elastic belt 9 is wound around the belt drive roller 7 and both belt guide rollers 8 with strong tension in a substantially T-shape. A portion of this belt 9 is in pressure contact with the outer periphery of a pair of tape winding portions 5a of the magnetic tape 5 wound around both tape reels 4.

Next, when this data cartridge is installed in the recording/reproducing apparatus, the base plate 2 and the upper cover 3 are opened and closed in such a way as to open and close the notch 10 formed at one end of the front side of the base plate 2 and the upper cover 3. The opening/closing door 11 rotatably attached between the covers 3 is opened in the direction of the arrow a as shown by the dashed dotted line, and the magnetic head 12 on the recording/reproducing device side is inserted into the notch 10 and the magnetic tape 5 is inserted. Contact. At the same time, a drive roller 13 such as a rubber roller on the side of the recording/reproducing device is inserted into an opening 14 provided in the upper cover 3, and a large drive roller 13, which is integrally formed on the upper part of the belt winding surface 7a of the belt drive roller 7, is inserted into the opening 14 provided in the upper cover 3. It is pressed onto the outer periphery of the diameter roller portion 7b. When the belt drive roller 7 is rotationally driven in the direction of arrow b by the drive roller 13, and the belt 9 is rotationally driven in the direction of arrow c, the belt 9 causes both tape winding portions 5 to 5.
Both tape reels 4 are rotationally driven in the direction of arrow d via a, and the magnetic tape 5 is rotated at 25 to 120 in/s in the direction of arrow e.
The magnetic head 12 records and reproduces data on the magnetic tape 5 while running at a relatively high speed of ec.

Conventionally, as shown in FIG. 11, a plurality of tape reels 4 and three rollers 7, 8 are rotatably supported on a base plate 2 made of metal such as an aluminum plate. A pair of tape reels 4 and three rollers 7 molded from synthetic resin with support shafts 15 implanted by press-fitting.
. Ta.

[0006]

[Problem to be solved by the invention] However, as in the past,
The structure in which the plurality of support shafts 15 are press-fitted onto the metal base plate 2 has a problem in that the parts cost and processing cost are extremely high.

Conventionally, the rollers 7 and 8 and the base plate 2 were insulated by the grease 17, so in particular, in an automatic data cartridge assembly machine, the belt 9 was driven at high speed to assemble the cartridge. When the magnetic tape 5 is wound into the magnetic tape 1 at high speed, a large amount of static electricity tends to be generated between the rollers 7, 8 and the belt 9 due to friction between the rollers 7, 8 and the belt 9. If a data cartridge charged with static electricity is used in a dry atmosphere, a discharge will occur after the charge rises to a certain value, destroying the data recorded on the magnetic tape 5. There were problems that caused accidents.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape cartridge in which the base plate is made of synthetic resin, and in which charging of a plurality of rollers and the like and heat accumulation can be prevented.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the tape cartridge of the present invention has the base plate molded from synthetic resin, and a metal spindle base having a spindle planted in the upper part. It is formed integrally with the base plate, and at least one of the rollers is inserted into the outer periphery of the spindle to be rotatably supported on the metal spindle base.

0010

[Operation] In the tape cartridge configured as described above, when the base plate is molded from synthetic resin, the metal support shaft base having the support shaft is integrally molded with the base plate. It is made of synthetic resin. At least one of the rollers was inserted into the outer periphery of the spindle and supported rotatably on the metal spindle base.
Static electricity that accumulates on the rollers and heat that accumulates on the rollers can be released through the metal spindle base.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a data cartridge to which the present invention is applied will be described below with reference to FIGS. 1 to 9. Note that the same reference numerals are given to the same structural parts as in the conventional example shown in FIGS. 10 and 11, and redundant explanation will be omitted.

First, referring to FIGS. 1 to 7, the base plate 21
We will explain how to make it into a synthetic resin.

First, the base plate 21 is injection molded from a synthetic resin such as polypropylene or polyacetal containing a reinforcing material such as glass fiber.
, a pair of support shafts 22 that rotatably support a pair of tape reels 4, a pair of support shafts 23 that rotatably support a pair of tape guides 6, one belt drive roller 7, and a pair of belt guides. A total of 3 rotatably supports the roller 8.
A support shaft 24, a support shaft 25 that rotatably supports the opening/closing door 11, a plurality of tape guide pins 26, etc. are each vertically integrally molded.

When the base plate 21 is injection molded from synthetic resin, a pair of support shafts 22 and three support shafts 23 are
A support shaft base 3 consisting of a total of five metal discs is attached to the bottom of the
1 is integrally injection molded using an insert molding method or the like.

At this time, as shown in FIGS. 1 and 2, the upper surface 31a of the spindle base 31 made of a metal disc is integrally formed flush with the upper surface 2a of the base plate 2. A plurality of radial fins 32 are integrally formed at the bottom of the support shaft base 3 from the gaps 33 between the fins 32.
A plurality of support shafts 22, 23, 24 are attached to the base plate 2 by injecting molten synthetic resin into a central hole 34 provided in the center of the base plate 2.
At the same time, the support shaft base 31 is molded integrally with the base plate 2.
be combined into one.

The upper cover 3 is injection molded from a transparent synthetic resin such as acrylic, and a pivot 4a at the center of the upper part of a pair of tape reels 4 and three supports are provided on the lower surface of the upper wall 3a. A ring-shaped bearing 27 into which the upper end of the shaft 24 is fitted is integrally molded.

According to the data cartridge configured as described above, the base plate 21 has a plurality of support shafts 22, 23, 2.
4, 25 and the tape guide pin 26 are integrally molded from synthetic resin, and the base plate 21 is made of synthetic resin.
25. The number of man-hours for manufacturing and assembling the tape guide pin 26 can be reduced, and the cost of the data cartridge can be significantly reduced.

Then, the tape reel 4, tape guide 6, rollers 7, 8, and opening/closing door 11 are rotatably inserted and attached to the outer peripheries of the plurality of support shafts 22, 23, 24, and 25 through the center holes 16, respectively. After a belt 9 is wound between the rollers 7 and 8, the base plate 21 and the upper cover 3 are joined together by screws or the like to form the cartridge 1.

A pair of tape reels 4, a tape guide 6, and three rollers 7, 8 are attached to each metal support shaft base 3.
These center holes 16 are filled with grease 17.

Therefore, the tape reel 4, tape guide 6
Since the rollers 7 and 8 are in electrical contact with the metal spindle base 31, the static electricity charged on the tape reel 4, tape guide 6, and rollers 7 and 8 is transferred through the metal spindle base 31. can be routed to any ground. As a result, these tape reels 4 and tape guides 6
Since the rollers 7 and 8 can be prevented from being charged with static electricity, data on the magnetic tape 5 can be prevented from being destroyed due to discharge of the charged static electricity.

As shown in FIG. 6, in order to wind the magnetic tape 5 into the cartridge 1 at high speed in the data cartridge automatic assembly machine, a rubber roller or the like is rotated at high speed by the motor shaft 36 of the motor 35. When the belt drive roller 7 is frictionally driven at high speed by the drive roller 13,
The frictional heat tends to be stored in the base plate 2 via the belt drive roller 7 and the support shaft 24. However, the frictional heat of the roller 7 is transferred to the cartridge 1 through the metal support belt 31.
Since heat can be easily radiated to the outside, heat accumulation in the roller 7 and base plate 2 can be suppressed, and adverse effects such as heating of the belt 9 and magnetic tape 5 and causing data errors can be prevented. I can do it.

As described above, according to this data cartridge, although the base plate 2 is made of synthetic resin, the tape reel 4 and the tape guide are 6. It has a feature that the static electricity of the rollers 7 and 8 and the heat of the roller 7 can be easily released.

Next, FIG. 8 shows a modification in which the support shafts 22, 23, and 24 are integrally formed with metal on the support shaft base 31, and the outer circumferential surface 31b of the support shaft base 31
has an annular rib 37 (
or annular groove) are integrally formed.

Next, FIG. 9 shows another modification, in which metal support shafts 22, 23, and 24 are mounted on the support shaft base 31 by press-fitting or the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various effective changes can be made based on the technical idea of the present invention.

Furthermore, the present invention is not limited to data cartridges, but can be applied to various tape cartridges.

[0027]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects.

Since the base plate can be made of synthetic resin by integrally molding the base plate, the number of processing and assembly steps can be significantly reduced, and the cost of the tape cartridge can be significantly reduced. I can do it.

When molding the base plate from synthetic resin, a metal support shaft base having a support shaft is integrally molded onto the base plate, and at least one of the rollers is inserted into the outer periphery of the support shaft to mold the metal support shaft base. Since the rollers are rotatably supported on the spindle base, the static electricity charged on the rollers and the heat stored in the rollers can be dissipated through the metal spindle base, so the base plate is made of synthetic resin. Despite this, charging and heat accumulation on the roller and base plate can be prevented as much as possible, and data destruction and data errors due to such charging and heat accumulation can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing essential parts of a data cartridge according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along the line BB in FIG. 7;

FIG. 4 is a sectional view taken along the line CC in FIG. 7;

5 is a sectional view taken along the line DD in FIG. 7. FIG.

6 is a sectional view taken along the line E-E in FIG. 7. FIG.

FIG. 7 is an exploded perspective view of the entire data cartridge.

FIG. 8 is a cross-sectional side view showing a modification.

FIG. 9 is a cross-sectional side view showing a modification.

FIG. 10 is a partially cutaway plan view showing the entire conventional data cartridge.

FIG. 11 is a sectional view taken along the line FF in FIG. 10;

[Explanation of symbols]

1 Cartridge 3 Upper cover 4
Tape reel 5 Magnetic tape (tape) 7
Belt drive roller (roller) 8 Belt guide roller (roller) 9 Belt 21 Base plate 22
Support shaft 23 Support shaft 24 Support shaft 31 Support shaft base

Claims (1)

[Claims] Claim 1: A tape wound around a pair of tape reels is stored in a cartridge constituted by a base plate and an upper cover, and a belt is placed between a plurality of rollers rotatably mounted on the base plate. The tape cartridge is configured such that the belt is wound around the tape reel, and the belt is pressed against the outer periphery of the tape winding portion of the pair of tape reels, and the tape reel is rotationally driven by the belt via the tape winding portion. A plate is molded from synthetic resin, a metal spindle base with a spindle planted on the upper part is integrally molded with the base plate, and at least one of the rollers is inserted into the outer periphery of the spindle. A tape cartridge characterized by being rotatably supported on a metal spindle base.