JP2005092938A - Servo writer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform replacing work of a magnetic head, and to fix the head in a short guide interval. <P>SOLUTION: A servo signal writing head is provided with a head member with a magnetic head for recording a servo signal on the servo band of a magnetic tape in sliding contact with the magnetic tape, and a head base member to be fixed to a servo writer main body. The head member is detachably mounted to the head base member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a servo writer, and more particularly to a servo writer in which a magnetic head of a servo signal write head can be replaced.

  In a tape system that records timing-based servo signals on magnetic tape, the servo signal is used to record the servo signal on the servo band of the magnetic tape while transporting the magnetic tape in the tape transport system when recording the servo signal. A servo writer including a writing head is used (see Patent Documents 1 and 2). The servo signal written by the servo signal writing head is used to record the data track on the magnetic tape by controlling the position of the recording head and the reproducing head with respect to the traveling magnetic tape. It can be traced to.

An example of a conventional servo signal write head H1 is shown in FIG.
The servo signal writing head H1 is attached to the panel side 40 of the servo writer with both sides sandwiched by tape guides 41, 41 for guiding the running of the magnetic tape. The servo signal writing head H <b> 1 has a base member 42 fixed to the panel side 40 and a bracket 44 that holds the magnetic head 43. The bracket 44 is attached to the base member 41 with screws 45a and 45b.

  In this servo signal writing head H1, the magnetic head 43 is in sliding contact with the traveling magnetic tape and records a servo signal on the servo band of the magnetic tape. As shown, it is fixed with screws or adhesive.

  However, in the conventional servo signal writing head H1, the mounting accuracy between the bracket 44 and the magnetic head is rough, and the mounting accuracy and the mounting position of the magnetic head are different for each bracket. Therefore, it has been necessary to readjust when the magnetic head 43 and the bracket 44 are replaced. In addition, it is difficult to maintain the accuracy of servo signal writing by the servo signal writing head. Furthermore, when various magnetic heads are exchanged, the bracket must be exchanged each time. There wasn't.

In addition, in the equipment where the bracket 44 is larger than the magnetic head 43 and it is an important factor to regulate the tape, between the servo signal writing head H1 (bracket 44) and the tape guides 41 on both sides, As shown in FIG. 4, a space SP in which a mechanism such as a guide for restricting the tape fluctuation cannot be arranged is about 40 mm. The presence of the space SP is disadvantageous in the servo signal writing head H1 where the restriction on tape fluctuation is particularly necessary.
US Pat. No. 4,996,609 (FIG. 3) US Pat. No. 5,508,865 (FIG. 4)

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a servo writer that makes it easy to replace a magnetic head and can fix the head during a narrow guide interval.

  In order to solve the above-mentioned problem, the invention of claim 1 is a servo writer comprising a servo signal write head that contacts a traveling magnetic tape and writes a servo signal on a servo band of the magnetic tape, wherein the servo signal The write head includes a head member that includes a magnetic head that slidably contacts the magnetic tape and records a servo signal on a servo band of the magnetic tape, and a head base member that is attached to a servo writer body, and the head member includes the head A servo writer characterized in that it is detachably attached to the base member is a configuration of the invention.

  In this servo writer, the servo signal writing head is configured so that the head member and the head base member are separate members, and the head member is configured to be detachably attached to the head base member. The head member can be easily detached from the head base member.

  According to a second aspect of the present invention, in the servo writer according to the first aspect, the head member holds the magnetic head and the magnetic head in a replaceable manner, and is detachably attached to the head base member. And a bracket.

  In this servo writer, the head member can be divided into a magnetic head and a bracket that is detachably attached to the head base member.

  According to a third aspect of the present invention, in the servo writer according to the first or second aspect, the bracket is one of the bracket and a tape guide portion provided on both sides of the magnetic head. The magnetic head is sandwiched between the two.

  In this servo writer, the gap between the tape guide portion and the magnetic head can be narrowed by sandwiching the magnetic head between the bracket and the tape guide portion of the servo writer.

  According to the first aspect of the present invention, the head member and the head base member are configured as separate members, and the head member is detachable from the head base member. A servo signal writing head can be configured. In addition, if the accuracy of manufacturing and mounting the components of the head member is increased, position reproducibility is improved by replacing the head member, and various adjustments of the magnetic head (for example, adjustment of azimuth, height, tilt, etc.) Only final fine-tuning is sufficient. In addition, stable servo signal writing can be performed while suppressing tape fluctuation. In addition, construction of a production line using various heads and replacement of magnetic heads are facilitated, which is effective in improving the operating rate of the production line.

  According to the second aspect of the present invention, since the head member can be divided into the magnetic head and the bracket that is detachably attached to the head base member, the magnetic head can be easily replaced. Further, the bracket can be miniaturized, and the gap between the magnetic head and the tape guides on both sides can be narrowed to about 2 mm, for example, and tape fluctuation suppression by the tape guide is performed more precisely.

  According to the third aspect of the present invention, the gap between the tape guide portion and the magnetic head is reduced to, for example, about 2 mm by sandwiching the magnetic head between the bracket and the tape guide portion of the servo writer. This is effective for suppressing tape fluctuations by the tape guide.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. 1 is a configuration diagram conceptually showing an example of a servo writer according to an embodiment of the present invention, FIG. 2 is a perspective view showing a servo signal write head, and FIG. 3 is an exploded view showing components of the servo signal write head. It is a perspective view.

  The servo writer 10 shown in FIG. 1 includes a delivery reel 11 for sending out the magnetic tape MT, and a take-up reel 12 for taking up the magnetic tape MT from the delivery reel 11. For example, a servo signal writing head H1 for writing a servo signal having a C-shaped servo pattern is disposed on the downstream side of the delivery reel 11 and the upstream side of the take-up reel 12. On the upstream side and the downstream side of the servo signal write head H1, guides 13 and 13 for running the magnetic tape MT along the servo signal write head H1 are provided across the servo signal write head H1. In addition, an inspection head (verification head) H2 for inspecting the servo signal written by the servo signal writing head H1 is provided between the downstream guide 13 and the take-up reel 12. The servo writer 10 includes a tension adjusting device (not shown) for adjusting the tension of the magnetic tape MT to a predetermined tension, a tension detecting device T, a guide roller R for guiding the magnetic tape MT, and the like. Various devices are provided.

  In this servo writer 10, the magnetic tape MT delivered from the delivery reel 12 is run along a predetermined path by the rotation of the capstan roller while being guided by the guide roller R, and the servo signal written by the servo signal writing head H1. Is recorded and the servo signal is reproduced by the inspection head H2, and then wound on the take-up reel 12.

  FIG. 2 shows the structure and arrangement of the servo signal writing head H1 and the guides 13 and 13 in detail. The guides 13 and 13 are attached to a reference side (hereinafter referred to as a panel side) 10 a of the servo writer 10. The contact surface 13a of the guides 13 and 13 with respect to the magnetic tape MT has an arc shape for smoothly sliding the recording / reproducing surface of the magnetic tape MT, and at the ends of the guides 13 and 13 on the panel side 10a side, A flange 13d is formed along the traveling direction of the magnetic tape MT. A contact 13c made of resin is attached to the end surface of the flange 13d on the human side (opposite the panel side), and an edge guide surface 13b for guiding the panel side edge (reference edge) MT1 of the magnetic tape MT is provided. It is composed. For example, an elastic body (not shown) is attached to the human side of each guide 13 in order to prevent damage to the magnetic tape MT.

  As shown in FIGS. 2 and 3, the servo signal writing head H <b> 1 includes a head member 33 and a head base member 34 to which the head member 33 is attached.

  The head member 33 slidably contacts the magnetic tape and records a servo signal on the servo band of the magnetic tape. The head member 33 holds the magnetic head 31 in a replaceable manner and is detachably attached to the head base member. Bracket 32 is provided.

  The magnetic head 31 incorporates a coil wound around a head core (not shown), has a magnetic gap having a predetermined gap pattern on the tape contact surface 31a, and is used for recording a servo signal from a servo signal supply circuit (not shown) via a conductor 31b. The pulse current is supplied. Then, the magnetic layer of the magnetic tape MT is magnetized by the leakage magnetic flux from the gap pattern, and a servo signal for controlling the position of the read head of the recording / reproducing apparatus is arranged along the longitudinal direction of the magnetic tape. Write on the band.

  The bracket 32 has a magnetic head holding portion 35 that is open on the upper side and two side surfaces, two side walls 32a and 32b that surround the magnetic head holding portion 35, and a bottom portion 32c, and four on the lower surface 32d of the bottom portion 32c. One knock pin 36a, 36b, 36c, 36d is implanted. The magnetic head 31 is fitted into the magnetic head holding portion 35 of the bracket 32, and the side surfaces 31c and 31d and the bottom surface 31e of the magnetic head 31 are respectively in contact with the side walls 32a and 32b and the bottom portion 32c of the bracket 32. Touch. As a result, the magnetic head 31 is held by the bracket 32. At this time, the magnetic head 31 may be adhered to the bracket 32 with an adhesive, or may be attached to an attachment hole provided on the inner surface or the inner bottom surface of the bracket 32 with a screw or the like.

  The head base member 34 is attached to the panel side 10a (see FIG. 1) of the servo writer 10 with the bracket 32 detachably attached thereto. The head base member 34 is provided with two legs 34b and 34b on both sides of the base body 34a with the opening 34c interposed therebetween, and the knock pins 36a, 36b, 36c and 36d of the bracket 32 are fitted into the mounting surface 34d. Mounting holes 37a, 37b, 37c, and 37d are formed. Further, a locking base portion 34e for locking the lower portion of the side wall 32b of the bracket 32 protrudes from a side portion of the upper surface 34d. The head base member 34 preferably has a tilt, height and azimuth fine adjustment mechanism.

  In assembling the servo signal writing head H1 to the servo writer 10, first, the head base member 34 is fixed to the panel side 10a of the servo writer 10. At this time, the leg portions 34a and 34b of the head base member 34 are inserted into mounting grooves (not shown) drilled in the panel side 10a of the servo writer 10, and fixed by screws or the like not shown. The head base member 34 is fixed on 10a.

On the other hand, the magnetic head 31 is inserted into the magnetic head holding portion 35 of the bracket 32 and attached to an attachment hole provided on the inner surface or the inner bottom surface of the adhesive or the bracket 32 with a screw or the like. Next, the knock pins 36a, 36b, 36c, 36d of the bracket 32 are fitted into the mounting holes 37a, 37b, 37c, 37d of the head base member 34. As shown in FIG. 2, the magnetic head 31 is sandwiched between the side walls 32a and 32b of the bracket 32 and the side surface of the tape guide 13 on the downstream side.
Thus, the servo signal write head H1 is configured as shown in FIG.

  In the servo signal writing head H1, the magnetic head 31 can be easily detached from the servo writer 10 by detaching the bracket 32 from the head base member 34 fixed to the panel side 10a of the servo writer 10. The mounting can be easily performed. Therefore, the magnetic head 31 can be easily replaced. If a bracket 32 to which various magnetic heads 31 are attached is prepared in advance, the magnetic head 31 can be replaced quickly and easily in response to a production line in which various servo signals are written by the servo writer 10. This is convenient for production. At this time, since the bracket 32 is fitted and mounted in the mounting holes 37a, 37b, 37c, 37d of the head base member 34 by the knock pins 36a, 36b, 36c, 36d, the accuracy and reproduction of the mounting position of the bracket 32 is achieved. It is possible to ensure sufficient properties. In particular, the vertical mounting accuracy of the head base member 34 to the panel side 10a, the flatness of the mounting surface 34d, and the flatness and verticality of 32d in the bracket 32 are preferably within 2 μm. As a result, the position accuracy of the servo signal writing head H1 configured by mounting the bracket 32 on the head base member 34 can be kept good.

  Further, since the magnetic head 31 is inserted and held in the magnetic head holding portion 35 of the bracket 32, the head base member 34 and the bracket 32 are provided if the mounting accuracy of the magnetic head 31 with respect to the bracket 32 is kept within a predetermined range. The positional accuracy of the magnetic head 31 with respect to the magnetic tape MT can be kept good in combination with the mounting accuracy and the like.

  Further, the width of the bracket 32 (width of the side wall 32a in the longitudinal direction of the magnetic tape) is narrowed, and the gap SP1 (see FIG. 2) between the servo signal write head H1 and the upstream tape guide 13 is at least 2 mm. It is also possible to approach the degree. As a result, the space SP1 in which a mechanism such as a guide for restricting tape fluctuations cannot be arranged is reduced although it is most necessary to regulate fluctuations in the width direction of the magnetic tape MT. it can. Therefore, stable servo signal writing can be performed by regulating tape fluctuation.

  The above-described embodiment shows an example of the servo writer of the present invention, and various modes are possible. For example, in the above embodiment, the bracket 32 is attached to the head base member 34 by the knock pins 36a, 36b, 36c, and 36d provided on the bracket 32. However, the present invention is not limited to this, and the attachment position is not limited thereto. Any method, mechanism, or structure can be used as long as the bracket 32 can be attached to the head base member 34 with good reproducibility. For example, as shown in FIG. 4A, a head base member 344 in which two bracket clamping portions 344c and 344d are erected on an upper portion of a base 344a with an opening 344b interposed therebetween, and fitted into the opening 344b. And a bracket 324 having a base 324a. Screw holes 37c and 37d into which screws 38c and 38d are screwed are formed in the two bracket holding portions 344c and 344d of the head base member 344, respectively. Further, screw fitting holes 39c and 39d communicating with the screw holes 37c and 37d when the base 324 is fitted into the opening 344b of the head base member 344 are formed on the side surface of the base 324a of the bracket 324. ing.

  In this servo writer, the base 324a of the bracket 324 is fitted into the opening 344b of the head base member 344, as shown in FIG. 4B (viewed from the direction of the arrow D shown in FIG. 4A). After mounting, the screws 38c and 38d are screwed through the screw holes 37c and 37d formed in the bracket holding portions 344c and 344d, and the tips 40c and 40d of the screws 38c and 38d are screwed into the base 324a of the bracket 32. Screwed into the holes 39c, 39d. Thereby, the bracket 324 may be fixed to the head base member 344. Also with the head base member 344 and the bracket 324, the bracket 324 can be attached to the head base member 344 while maintaining the reproducibility of the mounting position.

  In the above embodiment, the magnetic head 31 is fitted between the bracket 32 and the downstream tape guide 13, but the head base member 34 is disposed at a position close to the upstream tape guide. The magnetic head 31 may be fitted between the tape guide 13 and the bracket 32 on the upstream side.

It is a conceptual diagram which shows the structure of the servo writer which concerns on embodiment of this invention. It is a perspective view which shows a servo signal write head. It is a disassembled perspective view which shows the structural member of a servo signal write head. (A) is an exploded perspective view showing another configuration example of the head base member and the bracket of the servo signal writing head, and (b) is a view showing an assembled state of the head base member and the bracket. It is a perspective view which shows an example of the conventional servo signal write head. It is a schematic diagram which shows the magnetic head part of the conventional servo signal write head.

Explanation of symbols

31 Magnetic head 32 Bracket 33 Head member 34 Head base member H1 Servo signal writing head

Claims (3)

A servo writer comprising a servo signal write head for contacting a traveling magnetic tape and writing a servo signal on a servo band of the magnetic tape,
The servo signal writing head includes a head member including a magnetic head portion that slides on the magnetic tape and records a servo signal on a servo band of the magnetic tape, and a head fixing member that is attached to a servo writer body. A servo writer, wherein a member is detachably attached to the head fixing member.   2. The servo writer according to claim 1, wherein the head member includes a magnetic head part and a bracket that holds the magnetic head part and is detachably attached to the head fixing member.   3. The bracket according to claim 1, wherein the bracket sandwiches the magnetic head between the bracket and one of tape guide portions provided on both sides of the magnetic head. Servo writer as described in

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