JPH0590621U - Magnetic tape unit - Google Patents

Abstract

(57) [Abstract] [Purpose] Magnetic that can fix the grounding member that grounds the rotating drum to the chassis without using a dedicated fixing screw and without needing to secure an extra fixing space on the drum base. Provide a tape device. [Structure] The ground member 8 is fixed to the chassis 5 together with the conductive drum base 3 by tightening together with a drum base fixing screw 7. As a result, the fixing screw dedicated to the ground member can be omitted to reduce the number of parts, and it is not necessary to secure an extra space for fixing the ground member in the drum base 3. Furthermore, the earth member 8
Since the chassis 5 and the rotary drum 1 can be fixed to the chassis 5 at the same time as the drum base 3 while being electrically connected to the chassis 5, the number of assembling steps can be reduced and the assembling time can be shortened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is provided with a rotary drum equipped with a magnetic head, and records or reproduces information on or from a magnetic tape that is in sliding contact with the magnetic head of the rotary drum. DAT (digital audio tape recorder) or VTR (video). The present invention relates to a magnetic tape device such as a tape recorder), and more particularly to a magnetic tape device in which the rotating drum and the chassis are connected to each other by a ground member to ground the rotating drum.

[0002]

[Prior Art]

 FIG. 8 is a perspective view showing a conventional example of this type of magnetic tape device, and FIG. 9 is a front view of the same magnetic tape device.

As shown in the figure, the rotating drum 1 and the fixed drum 2 located below the rotating drum 1 are guided in a state in which they are unitized like a single cylinder and are tilted at a predetermined angle. It is supported by an electric drum base 31. A magnetic head (not shown) is mounted on the outer peripheral portion of the rotary drum 1. The rotary drum 1 is rotated by a drive mechanism (not shown). The rotary shaft 4 of the rotary drum 1 is integrated with the rotary drum 1, and the upper end of the rotary shaft 4 projects above the rotary drum 1.

The conductive drum base 31 is fixed on the conductive chassis 5. That is, the drum base 31 is formed with two fixing portions 31a and 31b extending to the left and right sides of the fixed drum 2, and the fixing portions 31a and 31b are screwed by the drum base fixing screws 6 and 7. As a result, the drum base 31 is fixed to the chassis 5.

Further, a grounding member 8 is erected on one fixing portion 31b of the drum base 31. The ground member 8 is connected to the chassis 5 in a substantially horizontal state at a support portion 8a made of a long metal plate whose upper and lower ends are bent substantially at right angles and the upper end of the support portion 8a. And a contact point 8c is provided on the lower surface of the tip of the pressure contact portion 8b. The grounding member 8 has its supporting portion 8a fixed to the fixing portion 31b of the drum base 31 by the grounding member fixing screw 9, and the contact 8c of the pressure contact portion 8b is fixed to the upper end of the rotary shaft 4 of the rotary drum 1. Pressed. As a result, the ground member 8 is electrically connected to the chassis 5 via the conductive drum base 31, and at the same time, electrically connected to the rotary drum 1 via the rotary shaft 4. That is, the rotary drum 1 is electrically connected to the chassis 5 and grounded via the grounding member 8.

In the magnetic tape device having the above structure, a magnetic tape (not shown) is run while being wound around the rotating rotary drum 1 and the fixed drum 2, and is brought into sliding contact with the magnetic head of the rotary drum 1. Then, information is recorded or reproduced on the magnetic tape.

Further, during the recording or reproducing operation, static electricity is generated on the rotating drum 1 and the fixed drum 2 due to friction with the magnetic tape or the like. The static electricity passes through the earth member 8 from the rotating drum 1. It is escaped to the chassis 5. As a result, generation of noise due to static electricity is suppressed, and deterioration of the S / N ratio is prevented.

FIG. 10 is a perspective view showing another conventional example. As shown in the figure, in this magnetic tape device, an insulating drum base 32 is used instead of the conductive drum base 31 in the above-mentioned conventional example. The shape of the insulating drum base 32 is similar to that of the conductive drum base 31, and fixed portions 32a and 32b are formed on both left and right sides of the supported fixed drum 2. Since the insulating drum base 32 is used as described above, the support portion 8a of the ground member 8 that grounds the rotary drum 1 is directly fixed to the side surface of the chassis 5 with the ground member fixing screw 9. Therefore, in this case, the support portion 8a of the earth member 8 has its lower end extended downward without being bent.

Thus, also in the case of this conventional example, the rotary drum 1 is electrically connected to the chassis 5 via the ground member 8 as in the case of the above-mentioned conventional example, whereby the rotary drum 1 and Static electricity generated in the fixed drum 2 is released from the rotating drum 1 to the chassis 5 through the ground member 8.

[0010]

[Problems to be solved by the device]

 In any of the above magnetic tape devices, the grounding member 8 for grounding the rotary drum 1 is fixed to the conductive drum base 31 or the chassis 5 with the dedicated grounding member fixing screw 9, so that the number of parts and the number of assembly steps are increased. There was a problem that and increased.

Further, in the conventional magnetic tape device in which the ground member 8 is fixed to the conductive drum base 31, the fixing portion 3b of the drum base 31 is grounded separately from the space where the drum base fixing screw 7 is penetrated. Since it is necessary to secure a space for fixing the members, there is a problem that the drum base 31 becomes large accordingly.

Further, in the conventional magnetic tape device using the insulating drum base 32, the fixed position of the ground member 8 fixed to the chassis 5 is greater than that of the case where the ground member 8 is fixed to the drum base 31. Since the distance from the shaft 4 is increased, the length of the ground member 8 is increased accordingly. As a result, when fixing the grounding member 8, the contact point 8c of the grounding member 8 must be accurately positioned so as to surely press the upper end of the rotary shaft 4 of the rotary drum 1 at a constant pressure. The problem arises that it becomes difficult.

The present invention has been made to solve these problems, and can fix the ground member without using a dedicated fixing screw and without needing to secure an extra fixing space in the drum base. A magnetic tape device that uses a conductive drum base and an insulating drum base that can accurately position and fix the grounding member without using a dedicated fixing screw. It is an object of the present invention to provide a used magnetic tape device.

[0014]

[Means for Solving the Problems]

 In order to achieve the above object, in the magnetic tape device using the conductive drum base according to the present invention, the ground member is fixed to the conductive chassis together with the conductive drum base by the fixing screw. Fixed

Further, in the magnetic tape device using the insulating drum base according to the present invention, the earth member is fixed together with the insulating drum base to the conductive chassis by tightening together with the conductive screw. did.

[0016]

[Action]

 In the above magnetic tape device using the conductive drum base, the ground member and the conductive drum base are fastened together with the fixing screw, so that the fixing screw dedicated to the ground member can be omitted and the number of parts can be reduced. Also, it is not necessary to secure an extra space for fixing the ground member in the drum base. Further, since the grounding member can be fixed to the chassis simultaneously with the drum base while being electrically connected to the chassis and the rotating drum, the number of assembling steps can be reduced and the assembling time can be shortened. You can

On the other hand, in the magnetic tape device using the insulative drum base, the earth member is fastened together with the insulative drum base with the conductive screw, so that the earth member is attached to the chassis through the conductive screw. It can be electrically connected. Also in the case of this magnetic tape device, as in the case of the magnetic tape device using the above-mentioned conductive drum base, the fixing screw dedicated to the ground member is omitted to reduce the number of parts and the number of assembling steps and to assemble the magnetic tape device. Working time can be shortened. Furthermore, since the grounding member can be fixed near the rotary shaft of the rotating drum, the length of the grounding member can be shortened, and as a result, the grounding member can be accurately positioned and fixed. It

[0018]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the components in the drawings of the embodiments that are the same as or equivalent to the components of the conventional example shown in FIGS. Omit it.

Example 1. 1 is a perspective view of a magnetic tape device according to a first embodiment of the present invention, and FIG. 2 is a front view of the magnetic tape device.

As shown in the figure, in the magnetic tape device according to the first embodiment, the unitized rotating drum 1 and the fixed drum 2 are supported by a conductive drum base 3, and the conductive drum base 3 is also supported. Is fixed on a conductive chassis 5, and the difference from the conventional example (FIGS. 8 and 9) in which the conductive drum base 3 is similarly used is the grounding member for grounding the rotary drum 1 to the chassis 5. There are 8 fixing methods.

That is, in this magnetic tape device, the earth member 8 is fixed to the chassis 5 together with the drum base 3 by being fastened together with the drum base fixing screw 7. Specifically, in a state where the support portion 8a of the ground member 8 is placed on one fixing portion 3b of the drum base 3, the supporting portion 8a and the fixing portion 3b of the drum base 3 are fastened together with the drum base fixing screw 7. There is. A contact 8c provided on the pressure contact portion 8b of the earth member 8 is pressed against the upper end of the rotary shaft 4 of the rotary drum 1. As a result, the earth member 8 is electrically connected to the chassis 5 and the rotary drum 1, and the rotary drum 1 is grounded to the chassis 5.

As described above, the ground member 8 is fixed together with the drum base 3 with the drum base fixing screw 7 to be fixed to the chassis 5, so that the fixing screw dedicated to the ground member is omitted and the number of parts is reduced. You can Further, since the ground member 8 can be fixed to the chassis 5 at the same time as the drum base 3 in a state of being electrically connected to the chassis 5 and the rotating drum 1, the number of assembling steps can be reduced and the assembling time can be shortened. Can be made Further, unlike the conventional example shown in FIGS. 8 and 9, it is not necessary to secure an extra space for fixing the ground member in the drum base 3, so that the drum base 3 is downsized and the magnetic tape device itself is downsized. be able to.

The operation of the magnetic tape device having the above-described configuration and the function of the ground member 8 are the same as those in the conventional example, and therefore the description thereof is omitted.

Example 2. 3 is a perspective view of a magnetic tape device according to a second embodiment of the present invention.

As shown in the figure, in the magnetic tape device according to the second embodiment, the rotating drum 1 and the fixed drum 2 which are unitized are supported by an insulating drum base 30, and the insulating drum base 30 is used. What is fixed on the conductive chassis 5 is the same as the conventional example (FIG. 10) using the insulating drum base 30 as well. The difference is that the method for fixing the ground member 8 for grounding the rotating drum 1 to the chassis 5 is used. It is in.

That is, in this magnetic tape device, the ground member 8 is fixed to the chassis 5 together with the drum base 30 by being fastened together with the conductive screw 70. Specifically, the support portion 8a of the ground member 8 is fastened together with the fixing portion 30b of the drum base 30 with the conductive screw 70 while being overlapped on the one fixing portion 30b of the drum base 30. . Therefore, the grounding member 8 in this magnetic tape device is electrically connected to the chassis 5 via the conductive screw 70. The contact 8c provided on the pressure contact portion 8b of the ground member 8 is pressed against the upper end of the rotary shaft 4 of the rotary drum 1. As a result, the grounding member 8 grounds the rotary drum 1 to the chassis 5 as in the case of the first embodiment.

As described above, by fixing the ground member 8 together with the insulating drum base 30 together with the conductive screw 70 to the chassis 5, the ground member 8 is exclusively used for the ground member. The fixing screw can be omitted to reduce the number of parts, and the ground member 8 can be fixed to the chassis 5 at the same time as the drum base 3 to reduce the number of assembling steps and the assembling time.

Further, unlike the case of the conventional example shown in FIG. 10, since the ground member 8 can be fixed near the rotary shaft 4 of the rotary drum 1, the length of the ground member 8 can be shortened. .. As a result, when fixing the grounding member 8, the contact point 8c of the grounding member 8 must be positioned accurately so as to surely press the upper end of the rotary shaft 4 of the rotary drum 1 with a certain appropriate pressure. Is possible.

Example 3. FIG. 4 is a perspective view of a magnetic tape device according to a third embodiment of the present invention, and FIG. 5 is a cross-sectional view of essential parts of the magnetic tape device.

As shown in the figure, in this magnetic tape device, the ground member 8 in the second embodiment is formed with a temporary fixing portion 8d for temporarily fixing the ground member 8 to the drum base 30. The temporary fixing portion 8d is continuously provided at the lower end of the supporting portion 8a of the earth member 8, and here, at the tip of the fixing portion 30b on one side of the drum base 30 fixed in a floating state on the chassis 5. It is formed in a substantially U shape so that it can be fitted.

When the temporary fixing portion 8d is fitted into the drum base 30 at a predetermined position, the ground member 8 is temporarily fixed in a state in which the contact 8c thereof is in pressure contact with the upper end of the rotary shaft 4 of the rotary drum 1. Then, the temporarily fixed earth member 8 is fastened together with the drum base 30 with the conductive screw 70 to be fixed to the chassis 5.

As described above, by forming the temporary fixing portion 8d on the ground member 8, it is not necessary to hold the ground member 8 by hand at the time of fixing, and the fixing portion 30b of the drum base 30 can be easily installed in a narrow space. Can be fixed to.

Example 4. The temporary fixing portion 8d formed on the earth member 8 is formed in an inverted L shape as shown in, for example, the perspective view of FIG. 6 and the cross-sectional view of the main part of FIG. The hole 8e may be provided so as to fit with the protrusion 30c provided at the tip of the fixing portion 30b. In this case, by fitting the projection 30c of the fixing portion 30b of the drum base 30 into the hole 8e of the temporary fixing portion 8d of the earth member 8, the earth member 8 is temporarily fixed at a predetermined position of the drum base 30. Will be done. Also in the case of the fourth embodiment, the same effect as in the case of the third embodiment can be obtained.

Regarding the structure for forming the temporary fixing portion 8d on the ground member 8 as described in the third and fourth embodiments, the magnetic tape in the first embodiment using the conductive drum base 3 is described. The same can be applied to the device.

[0035]

[Effect of the device]

 As described above, according to the magnetic tape device of the present invention, the grounding member is fixed together with the conductive drum base with the fixing screw so as to be fixed to the conductive chassis. It is possible to reduce the number of assembling steps and shorten the assembling time. Moreover, the drum base can be downsized, and the magnetic tape device itself can be downsized.

Further, according to another magnetic tape device of the present invention, the ground member is fixed together with the insulating drum base by the conductive screw so as to be fixed to the conductive chassis. As with the magnetic tape device using the conductive drum base, the number of parts and the number of assembling steps can be reduced and the assembling time can be shortened. Further, unlike the conventional magnetic tape device using an insulating drum base, the grounding member can be accurately positioned and fixed.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic tape device according to a first embodiment of the present invention.

FIG. 2 is a front view of the magnetic tape device according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a magnetic tape device according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a magnetic tape device according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of essential parts of a magnetic tape device according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a magnetic tape device according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view of essential parts of a magnetic tape device according to Embodiment 4 of the present invention.

FIG. 8 is a perspective view of a magnetic tape device in a conventional example.

FIG. 9 is a front view of a conventional magnetic tape device.

FIG. 10 is a perspective view of a magnetic tape device in another conventional example.

[Explanation of symbols]

 1 rotating drum 3 conductive drum base 30 insulating drum base 4 rotating shaft 5 chassis 7 drum base fixing screw 70 conductive screw 8 grounding member 8d temporary fixing part

Claims (3)

[Scope of utility model registration request] 1. A rotating drum having a magnetic head mounted thereon is supported by a conductive drum base, the drum base is fixed on a conductive chassis, and a grounding member electrically connected to the chassis is provided. A magnetic tape device for recording or reproducing information on or from a magnetic tape slidingly contacting a magnetic head of the rotating drum, which is formed by pressing the rotating drum to one end of a rotating shaft of the rotating drum. Together with the conductive drum base,
A magnetic tape device characterized in that it is fixed to the conductive chassis by being tightened together with a fixing screw. 2. A rotating drum having a magnetic head mounted thereon is supported by an insulating drum base, the drum base is fixed on a conductive chassis, and a grounding member electrically connected to the chassis is provided. A magnetic tape device for recording or reproducing information on or from a magnetic tape slidingly contacting a magnetic head of the rotating drum, which is formed by pressing the rotating drum to one end of a rotating shaft of the rotating drum. Together with the insulating drum base,
A magnetic tape device characterized in that it is fixed to the conductive chassis by being fastened together with a conductive screw. 3. The magnetic tape device according to claim 1, wherein the earth member is provided with a temporary fixing portion for temporarily fixing the earth member to the drum base.