JPS6365514B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a type position correction method in a printing device that selects and prints predetermined type characters, for example, a printing device that has a check digit printing wheel installed in a numbering device. It is.

(Prior Art) A code plate is integrated into a check digit printing wheel provided in a printing device, such as a numbering device, in order to arrange predetermined characters on the printing device.The code on this code plate is detected by a sensor and the print wheel is installed in a check digit printing wheel, for example, in a numbering device. The type is arranged in the printing position.
This cord usually consists of perforations (slits), which must be able to be detected by the sensor even when the cord plate is rotating. When the printing wheel needs to be rotated quickly, such as the printing wheel for check digits, it is necessary to widen the width of this perforation. (called a ningslit) to ensure positional accuracy.

(Problem to be solved by the invention) This is because if the normal perforation width is narrow, the perforation cannot be completely detected by the sensor, and for example, the perforation exceeds the sensor, making code selection impossible. If it is made wider, the stopping position of the printing wheel will not be constant, resulting in printing misalignment. Particularly when a pulse motor is used to rotate the printing wheel, this possibility arises because the position of the type is not mechanically regulated. The pulse motor rotates one step at a precise angle, and the rotation angle will not go awry due to inertia, etc. However, if the stop position of the type is wrong at first, for example, when the printing device is not in use, turn off the power. If the pulse motor is left in a free state and then the power is turned on again and the type starts to deviate from the printing position, it is necessary to supply pulses accurately during printing and detect the code on the code board to print the specified type. Even when placed in the printing position, there is a drawback that the letters are always misaligned due to the precise rotation of the pulse motor and the wide width of the perforations.

As a countermeasure against the above problems, positioning slits have been provided in addition to the normal perforations, thereby allowing accurate position detection.

However, if a positioning slit is provided,
Because normal perforations are not made in that part,
This had the disadvantage of increasing the size of the code plate, which affected the number of sensors, mounting positions, etc., and increased the size of the device. In addition, light alloys are used exclusively for the code plate because its inertia needs to be small for its function, but when large holes such as positioning slits are provided, a notch effect occurs and the code plate becomes extremely weakened. Therefore, strict care had to be taken during processing, transportation, installation, etc. at the parts stage, which became a problem.

In view of the above, an object of the present invention is to correct any deviation in the position of printed characters when rotating a printing wheel or the like using a pulse motor so that the printed characters are placed accurately at the printing position.

(Means for solving the problem) A code board having perforations having codes corresponding to each of the characters is integrally provided on a printed body having a large number of characters on the outer periphery, and these are connected in both left and right directions by a pulse motor. In a printing device that rotates and detects the code of the code plate with a sensor to place predetermined type at a printing position, pulses are supplied to a pulse motor one pulse at a time to move the printed body and code plate in a certain direction. The sensor reads the detection state of the sensor while rotating, and after this sensor detects the edge of the reference code that has a straight perforation in the predetermined normal direction, the printed body and code board are rotated in the opposite direction, and then the sensor A type position correction method in a printing device in which a predetermined number of pulses are supplied to a pulse motor after detecting an edge on the opposite side of the reference code to the edge of the reference code, thereby arranging the type on the printed body at the printing position. be.

(Embodiments and Effects) The present invention will be explained based on embodiments shown in the drawings. In FIG. 1, reference numeral 1 denotes a central control unit constituted by a microcomputer, 2 . . . a printing device, and 3 an interface between the central control device 1 and the printing device 2. The printing device 2 has a numbering printing wheel 4 and a check digit printing wheel 5 arranged side by side, and a code plate 6 is integrated with the printing wheel 5. The printing wheel 5 has a large number of printed characters (1, 2,...
0), and the code plate 6 is provided with a code encoding each character of the printing wheel 5 as perforations 7...
This code is detected by a sensor 8. The printing wheel 5 and code plate 6 are rotated integrally by a pulse motor 9. Reference numeral 10 denotes a printing press that prints by hitting paper against the type, and 11 a detector that detects when the printing press 10 is activated. The code plate 6 is aligned with one side edge 12 in the normal direction of the perforation 7 of one of the codes, for example, a code corresponding to type 1 (hereinafter referred to as the reference code), and the sensor 8 aligns the perforation of this reference code. 7 is detected, all of them are formed so that they can change from light-blocking to light-transmitting at the same time (because the edges are precisely finished in a straight line in the normal direction).

In FIG. 4, 1A is an address bus, and 1B is a data bus, through which the central control unit 1 and the interface 3 are connected. 1C is a read/write signal line. Reference numeral 15 denotes an address decoder which inputs an address signal from the address bus 1A, decodes it, and outputs address signals 15a . . . specifying individual circuits to be described later. 1
6 is a data gate circuit that inputs and outputs data to and from the central control unit 1, and outputs a data signal 16a specifying the rotation direction of the pulse motor 9, a data signal 16b indicating the number of pulses to be applied to the pulse motor 9, etc.;
Data when the detector 11 detects that the printing press 10 is activated and data when the sensor 8 detects the perforation 7 of the code plate 6 are input as a data signal 16c. 17 is a pulse motor 9
address decoder 1 with the rotation direction designating flip.
The direction of rotation of the pulse motor 9 is designated by the data signal 16a from the data gate circuit 16. That is, when the data signal is at H level, a clockwise rotation signal 17a is output, and when it is at L level, a counterclockwise rotation signal 17b is output. 18 is a pulse sending counter that counts the number of pulses sent to the pulse motor 9;
The number of pulses sent to the pulse motor 9 is counted by the data signal 16a from the data gate circuit 16, and when the count is zero, the signal 18a becomes L level. 19
is a pulse oscillation circuit which outputs a pulse 19a to the pulse sending counter 18 and gate circuits 20 and 21. The pulse sending counter 18 receives this pulse 1.
Countdown at 9a. gate circuit 20,
In addition to the above-mentioned pulse 19a, 21 includes signals 17a and 17b output from the flip-flop 17 for specifying the rotational direction of the pulse motor, and a pulse sending counter 18.
A signal 18a output from is input. 22
is a drive circuit for the pulse motor 9; 23 is a buffer for sending signals from the sensor 8 and detector 11 to the data gate circuit 16; when the designated signal 15b from the address decoder 15 is input, the signal 23a is sent to Output to gate circuit 16.

Next, based on such a configuration, the type correction method according to the present invention will be explained in detail with reference to the flow shown in FIG. When the power is down, the pulse motor 9 is in a free state. When the power is turned on from this state, it enters the set state, and at the same time, the buffer 23 is addressed by the address signal output from the central controller 1, and a read signal is output to the read/write signal 1c, and the sensor 8 The status is read into the central controller 1. Based on the read data, the central control device 1 determines whether the code being detected by the sensor 8 is the reference code. If it is not the reference code, the pulse motor rotation direction designating flip-flop 17 outputs an address signal that designates the pulse sending counter 18 to the address decoder 15, and also sends data to send one pulse to the pulse motor 9, causing the pulse motor 9 to rotate clockwise. The clockwise rotation signal 17a is outputted to the data gate circuit 16, and the read/write signal 1c is switched to a write signal. As a result, the pulse sending counter 18 counts one pulse and sets the signal 18a to H level, and at the same time sets the pulse motor rotation direction designating flip-flop 17 to clockwise rotation, and outputs a clockwise rotation signal 17a indicating this. At the same time as these are set, a pulse output from the pulse oscillation circuit 19 is sent to the pulse motor 9 via the drive circuit 22, and the pulse motor 9 rotates by one pulse in the clockwise direction. 1 in pulse sending counter 18
Due to the pulse input, this is subtracted and becomes zero, and the signal 18a becomes L level. After this, the sensor status is read again and the above operation is repeated. Then, when the reference code is detected by the sensor 8 (the light-blocking state changes to the light-transmitting state at a predetermined edge of the reference code), the pulse motor is rotated one step in the opposite direction, and then the sensor is read and the edge of the reference code is detected. is confirmed, and this operation is repeated until this edge is confirmed. When the reference code is no longer read, that is, when the sensor switches from drilling to the edge of the reference code, the pulse motor switches back to normal rotation and supplies a specified number of pulses (for example, the number of pulses to place the sensor at the center of the hole). It will be done. At this time, the type is located directly above the printing pressure table 10. Thereafter, a normal printing state is entered, and a predetermined number of pulses are supplied to the pulse motor 9 during printing to place a predetermined type directly above the printing plate 10. At this time, the central controller 1 calculates and supplies pulses to the pulse motor so that the sensor 8 is located at the center of each cord perforation. For this reason, during printing, the type is always located directly above the printing pressure table. Note that the same applies to the positioning of not only the characters on the printing wheel, but also the characters on the removable printing device when they are pulled out.

(Effects of the Invention) As is clear from the above description, according to the present invention, the reference code of the code board is detected by a sensor and the printed characters are placed at the printing position based on the edge of this reference code. Just by accurately finishing the edges of the reference code, the type can be accurately aligned with the printing position.

In addition, since the code plate does not have a strip-like long hole, the code plate can be made smaller and the device can be made more compact.The code plate itself also maintains its strength, making it easier to handle during processing and assembly. play.

[Brief explanation of drawings]

The drawings show one embodiment of the type position correction method in a printing device according to the present invention, and FIG. 1 is a block diagram of the printing device, FIG. 2 is a side view of the printing wheel, and FIG. 3 is a front view of the code plate. 4 is a block circuit diagram of the interface, and FIG. 5 is a flow diagram. 1... Central control unit, 2... Printer, 5... Printing wheel, 6... Code plate, 7... Perforation, 8... Sensor, 9... Pulse motor.

Claims (1)

[Claims] 1. A code plate having perforations with codes corresponding to each of the printed characters is integrally provided on a printed body having a large number of printed characters on the outer periphery, and these are rotated in both left and right directions by a pulse motor, and the code plate is rotated in both left and right directions by a pulse motor. In a printing device in which a code is detected by a sensor and a predetermined type is placed at a printing position, a pulse is supplied to a pulse motor one pulse at a time to first rotate the printed body and code plate in a certain direction while checking the detection state of the sensor. , the sensor detects the edge of the reference code with a straight perforation in a predetermined normal direction, rotates the printing body and the code plate in the opposite direction, and then the sensor detects the edge of the reference code opposite to said edge of the reference code. 1. A type position correction method in a printing apparatus, characterized in that after detecting a side edge, a predetermined number of pulses are supplied to a pulse motor to arrange the type on a printed body at a printing position.