JPS59177766A - Sheet recorder - Google Patents

Abstract

PURPOSE:To form a reference track on a prescribed position of a recording medium by stopping the carrying of a head when a feeding pulse of a stepping motor and an one-phase driving pulse have a prescribed phase relation and then carrying the head by the prescribed number of steps in the reverse direction. CONSTITUTION:The stepping motor stepping the head 3 in the radius direction of a sheet 1 is driven to carry the head up to the position where the most-external peripheral track is formed on the sheet 1. The rough position of said operation is detected by a most-external periphery sensor to detect the rough position of the head 3 and then fine adjustment is performed. When the head 3 reaches the most-external peripheral track by driving the motor 14, the detecting signal S of the most-external periphery sensor 5 is turned to the high level. At that time, a discriminating circuit 30 discriminates the relation between the signal S and a pulse A. A monitor 14 is reversed from the stopped state and the head 3 is returned by 8 steps in the inner peripheral direction and stopped to fix the forming position of the most-external peripheral track.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sheet recorder that records and reproduces signals using a sheet-like recording medium.

Background Art and its Problems In a sheet recorder that records and reproduces still images using a disk-shaped magnetic sheet (hereinafter simply referred to as a sheet), as shown in Figure 1, a sheet (1) has n magnetic sheets. While forming concentric trunks (21) to (2n), one still image is recorded for each track.

This recording is performed with the head (3) fixed and the sheet (
1) completes one recording by making one revolution, and then steps the head (3) in the radial direction indicated by arrow a to the position where the next trunk is formed to perform the next recording. l・It is done. Similarly, to record still images, a predetermined high frequency signal -m-' is applied to one field or one field.
This is done by recording a signal modulated with a frame of video signal.

The sheet (1) used in such a sheet recorder is not always used in the same recorder, and one sheet (1) may be used in a plurality of recorders. In that case, the positions of the trunks (21) to (2n) formed in all the recorders do not completely match due to variations in the mechanical positions of the heads (3) in the plurality of recorders. Therefore, if you use another recorder to record on a sheet (1) on which some trunks have already been recorded, new recordings will be made next to the last recorded trunk and this trunk. The distance between the trunk and the trunk may deviate from the standard, or in some cases, the two trunks may overlap.

In order to prevent this, conventionally the sheet (1)
For example, the first recording is performed on the outermost trunk (21), and subsequent recordings are made on this outermost trunk (21).
) is used as the reference trunk for recording. That is, before recording a still image, the trunk (21
) is played back, and the position of the head (3) is adjusted by auto-tracking so that the playback level is maximized.

Using this adjusted position as a reference, the head is then moved during subsequent recording. In this case, the problem is where to place the head (3) when first forming the reference track.

OBJECTS OF THE INVENTION The present invention provides a sheet recorder in which the reference track is formed at a predetermined position on a sheet.

Summary of the Invention The present invention provides a sheet recorder in which a plurality of trunks are formed by step-feeding a head driven by a cutting motor over a sheet-like recording medium.
A detection means for detecting that the head is in a predetermined position is provided, and the head is sent in one direction, and from the time when a detection signal from the detection means is obtained, the head is further sent in the one direction, and the sending pulse of the stinning motor is When a predetermined phase relationship is established between the drive pulse and the 1A-th driving assist pulse, the feeding of the head is stopped, and then the head is sent a predetermined number of steps in the direction opposite to the one direction described above from this stop position. This seat recorder is configured to stop at a stop position and form a reference trunk at this stop position.

Embodiment In the present invention, first, a stamping motor is driven to step feed the head (3) in the radial direction of the seat (1), so that the head (3) reaches the outermost trunk (21) on the seat (1). Bring it to the position where it will form. This operation is performed by mechanically detecting the approximate position by a mechanically provided outermost sensor. Head (3)
Once the rough positioning of the head (3) has been completed, the position of the head (3) is then finely adjusted.

Figure 2 shows the head drive device (4) and the outermost sensor (5).
) is shown below.

The head (3) has a reference shaft (6) and a guide shaft (
It is provided on a movable plate (8) supported movably in the directions of arrows a and b by force. This moving plate (8) is provided with a steel belt (9).
) is wound around the center Uυ of the semicircular gear α0) and fixed with a screw (12). The above gear (
10) is rotatably provided on the shaft 03) and is meshed with a pinion (151) driven by a stamping motor θa.The outermost sensor (5) is connected to the pinion ([(
A rotating arm 08) is provided at one end with a gear (16) that meshes with the centrifugal arm 08), and rotates about the shaft side as a fulcrum, and a census inch ([yellow]).

According to the above configuration, when the stepping motor 0 is driven, the step rotation is caused by the pinion IJ51, the gear (1
0) is transmitted to the movable plate (8) via the steel belt (9), which causes the movable plate (8) to move toward the head (3).
At the same time, step feeding is performed in the direction of arrow a or b. Along with this, the step rotation is performed by the pinion (19, gear j16
The rotation arm (L) is transmitted through the rotation arm (L), thereby causing the rotation arm α to rotate in a stepwise manner.Then, the head (3) moves to the outermost track (2) of the seat (1) in Fig. 1.
When you reach position 1), the rotating arm (l mark is the switch (
I■ turns on this switch (1gl). At this time, this outermost sensor (5) outputs rHJ (high level) detection No. 16 S. Note that the step feed and rotation of the head (3) It is assumed that the step feed ratio of the moving arm (18) is 1:1.

FIG. 6 shows an embodiment of the seven drive circuits of the stamping motor 04).

Assume that the head (3) is now located inside the outermost track (21), the switch (19) is off, and the signal S is "L" (low level). In this state, when a predetermined key operation is performed on the key operation unit (20), the control circuit operates the arithmetic circuit (4).This causes the logic circuit (23) to output the stevening motor feed pulse shown in FIG. P is applied, and a motor rotation direction setting signal S1 is also applied.The logic circuit (2) forms four-phase drive pulses A, A, B, B as shown in FIG. 4 based on the above signal P1S1. death,
Add to the motor (14J coil (28) (21) through the amplifier (24) 1251 (26) (2η). As a result, the motor α is driven in steps at a speed of 1 phantom slope with 1 pitch being 1.8°. .In this case the pulse P
is a one-phase drive pulse A (or A,
The relationship is such that the period of B and B) is divided into eight.

By driving the motor side as described above, when the head (3) reaches the outermost trunk (2,) from the inside, a detection signal S from the outermost sensor (5) becomes available. At this time, the relationship between this signal S and the pulse A is determined by the discrimination circuit (
30). When the signal S rises as shown by the solid line at time t2 in FIG. 4, it is the "L" period for the pulse, so in this case the motor α is further driven.

That is, the head (3) is further sent toward the outer circumference and the pulse A is
It is stopped at time t3 when becomes rHJ. Furthermore, when the signal S rises as shown by the dotted line at time t1 in Fig. 4, it is the "H" period of the pulse A, so in this case, the motor α becomes “L”, t
When rHJ is reached again at time 3, the treatment is stopped. Next, reverse the motor α and phantom from the above-mentioned stopped state, and head (3
) is returned 8 steps in the inner circumferential direction and stopped, and this position is used as the formation position of the outermost circumferential trunk (21).

Similarly, when positioning is performed from a state where the head (3) is at the outermost position further than the position of the outermost trunk (21) and the signal S is "L", first the head (3)
is sent to the inner circumferential direction, and once the signal S is set to rLJ,
Positioning is done according to the procedure described above. In this way, the positioning of the head (3) to the outermost trunk (21) is as follows:
The process is always started with the outermost sensor (5) in the OFF state. This means that the on/off response of the outermost sensor (5) is, for example, 2m! This is because the position of the head (3) differs between from on to off and from off to on since there is a delay of about lcc. The above is a case in which the reference track is the outermost trunk (21), but the reference trunk may be the innermost trunk or another trunk. Similarly, when the head (3) is positioned as described above, if it has already been recorded, the final positioning is performed by auto-tracking using electrical control, and if there is no recording signal, , a reference trunk is formed at the same position.

Effects of the Invention A reference trunk can be formed at a predetermined position on a sheet-like recording medium.

[Brief explanation of drawings]

FIG. 1 is a plan view of a disk-shaped magnetic sheet to which the present invention can be applied, FIG. 2 is a plan view showing an embodiment of the head drive device and outermost sensor according to the present invention, and FIG. A block diagram showing an embodiment of the drive circuit, and FIG. 4 is a timing chart of FIG. 6. Note that the symbols used in the drawings are: (1) disc-shaped magnetic sheet (21) outermost trunk (3) head (5) outermost sensor Oa... stevening motor. Agent: Katsutsune Doyo, Yoshikazu Sugiura

Claims (1)

[Claims] A sheet recorder is configured to form a plurality of trunks by stepping a head driven by a stamping motor over a sheet-like recording medium. When the head is sent in one direction and the detection signal of the detection means is obtained, the head is further sent in the one direction, and when the sending pulse of the stamping motor and the one-phase drive pulse have a predetermined phase relationship, the above-mentioned A sheet recorder that stops feeding the head, then moves the head a predetermined number of steps in a direction opposite to the one direction from this stopping position and stops, and forms a reference track at this stopping position.