JPH0217856B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a data input tape reading device (tape reader) used in a numerical control device (NC), etc., and particularly to a tension arm control system for a reel-equipped tape reader. Regarding.

[Prior art]

In tape readers with reels, the tape feed speed changes rapidly when the tape starts and stops, but a reel motor is generally able to respond instantaneously to changes in tape feed speed due to its load inertia. Can not. For this reason, a tape leader with a reel is provided with a tension arm to prevent the tape from breaking by absorbing sudden changes in the feed speed. By the way, in individual tape readers,
Since the maximum stroke of the tension arm is fixed, the range of movement of the tension arm is limited by the stopper. Therefore, if the response of the reel motor is not sufficient, the tension arm may collide with the stopper and the tape may break.In conventional tape readers with reels, the tension arm is prevented from colliding with the stopper. In order to do this, a fast-response reel motor is used. However, in general, increasing the response speed of a reel motor requires using a larger reel motor and increasing the current flowing through the reel motor.

[Purpose of the invention]

In view of the problems of the prior art described above, an object of the present invention is to change the set position of the tension arm in advance when starting and stopping the tape, thereby lengthening the stroke of the tension arm in a pseudo manner, thereby providing a relatively responsive response. An object of the present invention is to provide a tension arm control method that makes it possible to use a slow reel motor.

[Structure of the invention]

In order to achieve the above object, the present invention provides a tape reader with a reel that includes a reel motor, a tension arm position detector, and a reel motor controller to control the position of the tension arm. When starting, stopping, or changing the tape feed speed, the stroke of the tension arm is artificially lengthened by moving the setting position of the tension arm in the direction opposite to the swing direction of the tension arm. A tension arm control system for a reel-equipped tape leader is provided.

〔Example〕

A tension arm control system for a tape reader with a reel as an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the general configuration of an NC paper tape reader. In Fig. 1, 1 and 1' are tape winding reels, 2 and 2' are reel motors, 3 is an NC paper tape, 4 is a capstan motor, 5 is a data reading section, and 6 and 6' are The tension arm, 7 and 7' are tension arm stoppers, and 8 and 8' are position (angle) detectors.

In FIG. 1, the tension arms 6, 6' are
It is controlled to a position where the tension of the tape by a spring (not shown) and the reel motors 2, 2' are balanced. FIG. 2 shows a control circuit for controlling the position of the tension arm in the tape reader of FIG. In FIG. 2, 9 is an advance control circuit, 10 is a position detection circuit, 11 is an adder, and 12 is a reel motor drive circuit. The advance control circuit 9 receives a forward (FORWARD) command signal S1, a reverse direction (REVERSE) command signal S2, and a tape feed (FEED) command signal S3, and outputs a tension arm position setting signal S4. This position setting signal S4 is compared with the position detection signal S5 from the position detection circuit 10 in the adder 11, and the output signal S6 of the adder 11 is
2. The motor current circuit 12 supplies the reel motor 2 (or 2') with a drive current according to the signal S6. A change in the torque of the reel motor 2 changes the tape tension and controls the position of the tension arms 6 and 6'.

In the tension arm control method according to the present invention, the tension arm position setting signal is switched so as to move the tension arm position in advance in a direction opposite to the deflection direction when starting and stopping tape feeding. FIG. 3 shows the relationships among various signals in the control circuit of FIG. 2. Further, FIG. 4 shows the relationship between the setting position and stroke of the tension arm. In Fig. 3, initially, the forward direction command signal S1, the reverse direction command signal S2, and the tape feed command signal S3 are all "L", and the tension arm position setting signal S4 is set to the center position of the stroke or 3'. be done. Next, when the tape feed command signal S3 becomes "H" after the forward direction command signal S1 becomes "H", the position setting signal S4 is set to the position or 4'. Therefore, at the start of tape running, the tension arm 6 or 6' can swing from the set position or 4' to the stop position or 1'. Next, when the tape feed command signal S3 changes from "H" to "L", the position setting signal S4 is switched to position or 5'. Therefore, when the tape stops running, the tension arm 6 or 6'
from set position or 5′ to stopper position or
It can swing up to 2′. After the tape has completely stopped, positioning signal S3 is returned to the center position or 3'. Similarly, when the reverse direction command signal S2 becomes “H”, the position setting signal S
4 switching is performed.

As described above, according to the tension arm control method according to the present invention, the stroke of the tension arm at the start of tape running can be extended from a to b compared to the conventional stroke, and when stopped, it can be extended from a' to b'. It can be made longer (Figure 4). In Figure 5,
The position changes of the tension arms 6 and 6' when the tape starts and stops running are shown. In FIG. 5, the change in position of the tension arm in the conventional case is shown by broken lines. As shown in FIG. 5, even if the conventional method collided with the stopper, according to the method of the present invention, the collision can be avoided as shown by the solid line.

〔Effect of the invention〕

According to the present invention, in a tape leader with a reel, the stroke of the tension arm can be lengthened in a pseudo manner, thereby making it possible to use a smaller reel motor, and reducing the current flowing through the reel motor. be able to.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the general configuration of a tape reader with a reel, FIG. 2 is a configuration diagram of a circuit for controlling the tension arm in the tape reader of FIG. 1, and FIG. A diagram showing the waveforms of various signals in the circuit of FIG. 2 when the tension arm control method is used, and FIG. 4 shows changes in the stroke of the tension arm when using the tension arm control method according to the present invention. FIG. 5 is a diagram showing how the position of the tension arm changes when the tension arm control method according to the present invention is used. Explanation of symbols, 1, 1': Reel, 2, 2': Reel motor, 3: Tape, 4: Capstan motor, 5: Reading section, 6, 6': Tension arm,
7, 7': Stopper, 8, 8': Position detector, 9:
Advance control circuit, 10: Position detection circuit, 11: Adder, 12: Motor drive circuit.

Claims (1)

[Claims] 1. In a tape reader with a reel equipped with a reel motor, a tension arm position detector, and a reel motor controller to control the position of the tension arm, the tension Tension arm control for a tape reader with a reel, characterized in that the stroke of the tension arm is lengthened in a pseudo manner by moving the setting position of the tension arm in advance in a direction opposite to the swinging direction of the tension arm. method.