JPS6112792B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting a carriage position, and more particularly, the present invention relates to a method for detecting a carriage position, and more particularly, the present invention relates to a method for detecting a carriage position. The present invention relates to a method for detecting a carriage position in a device that uses a motor to perform control including acceleration and deceleration such that the carriage speeds up, approaches the home position, decelerates, and stops at the home position.

Conventionally, in carriage return control using this type of motor, a homing operation is performed as an initial operation to match the stop position of the carriage with a position counter of a control circuit. Therefore, this homing operation is performed either by repeating backspace operations until the home position is detected, or by slow operations that can be stopped immediately. However, in such a method, for example, a print width of 80 characters/line
In the case of a 30 character/second printer, it would take a maximum of 2.6 seconds to repeat the backspace operation. This required time is supposed to define the time when operation can be started by automatic call reception. However, according to CCITT Recommendation X.20, it is necessary to return a response within 600 msec after a call, and then print the received code, which requires a homing operation in a short time. However, the above-mentioned method cannot satisfy this requirement.

For this reason, a short-time homing operation method uses two signals: a near-home position signal indicating the deceleration range and a home position signal indicating the stop position, and controls the carriage with acceleration when the carriage is far from the home position. I will do it.

In order to solve such problems, recently the above two
In order to obtain the signal, two detectors are connected to each other.
A method has been proposed in which the carriage position is detected using two sets of position detectors.

However, since such a method requires two sets of detectors, it has the drawback of being complicated and uneconomical, and also has problems in terms of reliability because it requires two sets of detectors. .

In view of the above points, the present invention has been made to solve such problems and eliminate such drawbacks.The purpose of the present invention is to provide a set of carriage position detection systems that do not require process memorization and that have a simple configuration. Acceleration, deceleration, and stopping can be carried out by the device, and the reliability can be improved by reducing the number of position detectors. Furthermore, the homing operation time can be shortened, and the configuration can be simplified. The object of the present invention is to provide a carriage position detection method that is economical and suitable for mass production, and which can reduce the cost of the device.

In order to achieve such an object, the present invention provides a shielding plate that indicates deceleration and drive stoppage in the carriage return operation within the length of a continuous plate for detecting the position of the carriage, and detects this shielding plate. 1
It has one set of detectors consisting of two detection elements, and the leading edge in the output range of the detection signal obtained by this detector is set so as to indicate the beginning of the deceleration region during return control, and the trailing edge is set so as to indicate the start of the deceleration region during return control. The length of the shield plate and the position of the detection element are set to indicate the home position, and in the homing operation after power is turned on, if the detection signal is off, a space operation is performed prior to the return operation, and the detection signal is When turned on, return control is performed from near the home position.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram for explaining an embodiment of the carriage position detection method according to the present invention, and shows a carriage feeding system of a serial printer.
In the figure, 1 is a carriage, 2 is a motor such as a pulse motor or servo motor, 3 is a pulley attached to the shaft of the motor 2, and 4 is a wire or belt stretched between the carriage 1 and the pulley 3 (hereinafter referred to as It is assumed that the transport belt is used to move the carriage 1). The feed system of the carriage 1 is connected by a pulley 3 mounted on the shaft of a motor 2 and the carriage 1 via a transfer band 4. Further, a stopper mechanism 5 is provided to prevent the carriage 1 from moving past the home position. Reference numeral 6 denotes one shielding plate that indicates deceleration and drive stop in the carriage return operation within the continuous length of the plate, and 7 denotes one detection element that detects this shielding plate 6. These detect the position of the carriage 1. A detector is configured for detection, and the leading edge of the detection signal obtained by this detector indicates the start point of the deceleration region during return control, and the trailing edge of the detection signal indicates the home position. . Here, the shielding plate 6 constituting this position detector is shown to be attached to the carriage 1 in the figure, but
Even if it is attached to the transfer band 4, the same effect will be obtained.
Further, even if the positional relationship between the shielding plate 6 and the detection element 7 is reversed from the illustrated position, the same function can be achieved. Further, the feeding system of this carriage 1 can be similarly applied to a feeding system using a helical shaft.

Therefore, the configuration of this carriage position detector may be mainly composed of an optical element such as a photo coupler, or may be mainly composed of a reed switch or a Hall effect element, and can be arbitrarily selected according to the requirements. . Then, the feeding operation is performed by rotating the motor 2 in the left or right direction as shown by the arrow, and the carriage 1 is moved in response to this rotation.
moves to the right or left. Along with this movement, the detection signal of the position detector also turns on and off.

Next, a second example of a specific implementation method of the present invention will be described.
This will be explained using figures.

Figure 2 is a time chart showing the carriage position, detection signal, and speed in the embodiment shown in Figure 1, and shows the stop position POS of carriage 1 and the detection signal of the carriage position when the printing operation is performed after a space.
This shows the relationship between DET. In FIG. 2, STP indicates the set position of the stopper mechanism 5 shown in FIG. 1, and PRF indicates the carriage speed profile of the homing operation return control according to the present invention. Various examples of carriage speed profiles PRF are shown.

First, the output range of the detection signal DET is determined by the mounting position of the detection element 7 and the length of the shielding plate 6. n+
1 to n, with the trailing edge B indicating the home position, that is, 1 to n of the stop position POS of the carriage 1.
It is set as between o. And this second
The ON section of the carriage position detection signal DET shown in the figure is the length of the shielding plate 6 (carriage feeding direction).
The vehicle decelerates and stops in this section. In addition, the setting position STP of the stopper mechanism 5
is set so that no matter how much the carriage 1 is moved when the power is turned off, the position of the carriage 1 will not be -1 of the stop position POS after the power is turned on. The carriage speed profile PRF differs depending on whether a servo motor or a pulse motor is used as the motor 2.
Next, when controlling the return of the homing operation, if the carriage position detection signal DET is on, it is the same regardless of the motor type, and the backspace operation can be repeated, and it can be stopped immediately when the home position is detected. The operation may be performed at a low speed. In addition, in FIG. 2, the former backspace operation is shown with repetition.

However, if the carriage position detection signal DET is off when controlling the return of homing operation,
The position of the carriage 1 may be the home position or the acceleration area. In order to know the difference between the two, a space operation is performed prior to the return operation to move the carriage position. Here, the stopper mechanism 5
Otherwise, you will need to perform the space operation multiple times. When it is determined that the motor is in the acceleration region, if the motor 2 is a servo motor, the amount of movement is set to n, similar to the homing operation for daisy wheel type selection, and the movement is indicated until the detection signal DET turns on. Recovery can be controlled by ignoring feedback. Further, if the motor 2 is a pulse motor, return control can be performed by changing the acceleration to a high constant speed or acceleration while the detection signal DET is off, and decelerating when the detection signal DET is turned on. FIG. 2 shows the latter case where a pulse motor is used. In addition, the carriage speed profile PRF in Figure 2
1 shows a mode of return control of the homing operation corresponding to the carriage position detection signal DET, and the arc moves in the direction of the arrow through steps.

FIG. 3 is a flowchart showing return control during homing operation, and shows the case of the time chart in FIG. 2.

However, except for the initial homing operation, the return operation can be performed according to the position counter in the control circuit, but it is possible to perform the return operation according to the position counter in the control circuit, but it is possible to perform the return operation according to the position counter in the control circuit. In order to obtain this, it is effective to standardize the homing operation and the case using normal codes except for the judgment of whether or not the home position is located, in the same way as when two sets of detectors are used. .

In the above embodiments, the configuration and operation of the control circuit in the return operation have not been mentioned, but since this belongs to normal control technology, it can be realized by known means if necessary. For example, conventional wiring logic control or program control using a microprocessor may be used. However, if it is program controlled,
This can be done by adding simple program processing. Further, in the above embodiment, the case where it is applied to a carriage feeding system has been described, but the present invention is not limited to this, and if the same idea is applied to a type selection system, the homing operation can be improved. It is possible to reduce the required time.

As is clear from the above description, the present invention detects the position of the carriage by using one shielding plate and one shielding plate with a simple configuration, without using complicated means such as providing two detection bodies on the left and right sides. 1 consisting of detection elements of
This is a detection mechanism that uses a pair of detectors and uses the detection signals as the leading and trailing edges of the output.It also does not require memorization of the process and performs return control including acceleration and deceleration during homing operation. Therefore, the structure is simpler than conventional methods of this type, and the method is economically effective.

In addition, it is possible to perform everything from acceleration/deceleration to stopping with a single set of simply configured carriage position detectors, and by reducing the number of position detectors, reliability can be improved, and homing operation time can be improved. In addition to being able to reduce the size of the device, the cost of the device can be reduced due to the simplification of the configuration, and it is extremely effective in that it is economical and suitable for mass production.

As described above, the present invention has significant effects compared to conventional methods of this type, and is unique as a carriage position detection method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining an embodiment of the carriage position detection method according to the present invention, FIG. 2 is a time chart for the embodiment of FIG. 1, and FIG. 3 is a flow chart for explaining the operation of the present invention. It is. 1... Carriage, 2... Motor, 3... Pulley, 4... Transfer band, 5... Stop mechanism, 6...
Shielding plate, 7...detection element.

Claims (1)

[Claims] 1 The carriage return operation of a serial printer is
In a device that uses a motor to perform control including acceleration and deceleration, such that when the carriage is far from the home position, the carriage accelerates or accelerates to a high constant speed, and when it approaches the home position, it decelerates and stops at the home position, A set of detectors for detecting the position of the carriage, including one shielding plate that indicates deceleration and drive stop in the carriage return operation within the length of the continuous plate, and one detection element for detecting this shielding plate. The length of the shielding plate is detected so that the leading edge in the output range of the detection signal obtained by this detector indicates the start of the deceleration region during return control, and the trailing edge indicates the home position. In the homing operation after the element position is set and the power is turned on, if the detection signal is off, a space operation is performed prior to the return operation, and if the detection signal is turned on, return control from near the home position is performed. A method for detecting a carriage position.