JPS599354B2 - Type wheel type selection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type selection mechanism for printing barcodes, etc. on paper using a type ring in which a large number of type characters are engraved on the outer peripheral surface of a disc, and particularly relates to a type selection mechanism for printing a bar code, etc. The present invention relates to a type selection mechanism that is advantageous when selecting a type for each type wheel by having one type selection mechanism for each type wheel and applying the type selection mechanism to the type wheels sequentially.

Conventionally, in a type device having such a type wheel, the type wheel is always rotated in one direction by a pulse motor through a gear system, and the position of each type on the type wheel is determined by the position of one type on the type wheel. This information is now known by detecting magnets embedded in them using magnetic sensors.

Therefore, when selecting one type from among many types on the type wheel and setting it at the printing position, if the desired type is approximately one rotation away from the type in which the magnet is embedded, the magnet will be detected. Since it takes one revolution to select the type and one more revolution to rotate it to the desired type position, the type wheel must sometimes be rotated nearly two times, requiring a long time for selection, and a long period of electrical control. Due to the operation and mechanical rotation, there are drawbacks such as shortening the life of the device and consuming large amounts of power. The present invention has been proposed in view of these points, and includes a magnetic element provided in one of the plural toothed ridges of the type wheel to indicate that a predetermined type is present at the printing position of the type wheel. , a first detection means provided with a corresponding type code on each side surface of the plurality of toothed ridges, and provided with a first detecting means capable of detecting the magnetic element at a position where the type wheel is in a resting state; By providing a second detection means for detecting the type code applied to the type wheel at the rotating position of the type wheel, the type selection time can be significantly shortened.

Next, embodiments for implementing the mechanism of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, the type wheel 1 has, for example, 16 tooth-shaped ridges 2 formed on the outer periphery of a disk, and the tooth-shaped ridges 2 have codebars corresponding to numbers from o to 14, for example. and blank spaces are engraved consecutively. A barcode paper 3 is supplied to a predetermined position A on the outside of the type wheel 1 and is printed using a bar code X. are combined. Rotating shaft 6
In addition, there are small holes 7 equal to the number of cord bars and spaces of type wheel 1.
A photo sensor 9 detects the presence or absence of a small hole 7 and generates a rotation pulse every time the type wheel 1 rotates one pitch. On the other hand, a magnet 10 is embedded in the number 13, for example, on the type wheel 1,
A magnetic sensor 11 is provided on the outside of the type wheel 1, for example, at the second number from the printing position A, so that when the magnet 10 and the magnetic sensor 11 face each other, a blank is exactly located at the printing position A. ing.

Therefore, by detecting the presence or absence of the magnet 10 with the magnetic sensor 11 when the type wheel 1 is in a stationary state, the presence or absence of a blank space at the printing position A can be directly known. Further, a code hole 12 is provided in the toothed crest 2 of the type wheel 1, and a photo sensor 13 is provided between the toothed ridges adjacent to the magnetic sensor 11 described above.
is provided, and by detecting the code hole 12 with this photo sensor 13, the number passing through the photo sensor 13 and the position of each number at that time are known. These sensors 1
1, 13 and a photo sensor 9 which generates rotation pulses are connected to the input side of a central control unit 20 having an information input device 14. As will be described later, the central control unit 20 knows the position of each number etc. on the type wheel 1 through sensors 11 and 13, receives instructions on the number etc. to be printed from the information input device 14, and further moves the position of the type wheel 1 by rotation pulses from the photo sensor 9. Knowing that 1 is rotating, the operator determines the shortest route to transport the numbers, etc. to be printed to the printing position based on these materials. A pulse motor 5 including a pulse motor control device 15 and a pulse motor drive device 16 is connected to the output side of such a central control device 20, and the pulse motor 5 is controlled by these pulse motor control and drive devices 15 and 16. The rotation is performed in accordance with the decision of the central controller 20. Next, referring to FIG. 3, the central control unit 20 will be explained. First, the AND control unit 20 detects blank spaces in the numbers etc. on the type wheel 1.
AND gates 22 and 23 are provided to detect the numbers 14 and O on both sides of the gate 21 and the blank space, respectively.
The magnetic sensor 11 is connected to the input sides of these AND gates 21 to 23, and the information input device 14 is connected via a register 24. The output side of the AND gate 21 is connected to the inverter 25 and connected to the pulse motor control device 15.
The output sides of the AND gates 22 and 23 are connected to the pulse motor control device 15 via a rotation control circuit 26, and the magnetic sensor 11 and an inverter 27 are connected to this rotation control device 20. In this way, a blank is set by the information input device 14, and when the magnetic sensor 11 detects a magnet and there is a blank at the printing position A, only the output of the AND gate 21 becomes 1. The signal from the inverter 27 is also inverted.

Therefore, the pulse motor control device 15 together with the rotation control circuit 26 does not perform any control operation, and the pulse motor 5 is held stationary, and a blank continues at the print position A and remains at the X position as set. Also, if 14 or O is set when there is a blank space at print position A, the AND
Since the output of the gate 21 becomes O, a signal is inputted to the pulse motor control device 15 by the inverter 25, and the stopping action of the pulse motor 5 is released. On the other hand, AND gate 22
Also, since the output of 11$23 is 1, the rotation control circuit 2
At step 6, single forward and reverse rotations are instructed. Then, the pulse motor 5 rotates the type wheel 1 one pitch in the forward and reverse directions by the pulse motor control device 15 or the like, and the number 14 or O comes to the printing position A. Since such a blank setting control is very often specified as a blank, it is specially provided separately from the numerical setting control.

Setting control from the blank state of numbers 14 and 0 on both sides of the blank is provided separately for reasons of operational performance of the pulse motor 5. In other words, if the pulse motor 5 is continuously rotating, it cannot be stopped by a stop signal alone to avoid overshooting. Try to do it by rotating. Next, the central control unit 20 includes a gate 28 for detecting whether the set number is smaller than the number 7, a subtraction circuit 29 for subtracting 1 from the set number, and a subtraction circuit 29 for subtracting 4 from the set number. Subtraction circuit 30
The register 24 and the magnetic sensor 11 are connected to the input side of the gate 28, and the output side thereof is connected to the rotation control circuit 26.
connected to. A register 24 is connected to the input side of the subtraction circuits 29 and 30, and the output side thereof is connected to a register 31.
, 32 to the switching gate 33. The output side of the switching gate 33 is connected to the pulse motor control device 15 through a comparison circuit 34 and an 0R gate 35.
The photo sensor 9 is connected to the input side of the photo sensor 13, and the photo sensor 13 is also connected to the S-P converter 36.
Furthermore, the output side of the gate 28 is connected to the switching operation side of the switching gate 33. In this way, when there is a blank at printing position A, what is set by the information input device 14 is blank, 14
, 0, and the set number is 6 or 5.
etc., the output of the gate 28 is 1.
become.

Therefore, the rotation control circuit 26 determines that if the type wheel 1 is rotated in the forward direction, the set numerals can be brought to the printing position more quickly, and the rotation in the forward direction is instructed. Also, at this time, the switching gate 33 is switched to the subtraction circuit 3 by the output signal of the gate 28.
A switching operation is performed so that the 0 side is electrically connected to the comparator circuit 34, the set number and the subtracted value of 4 are input to the comparator circuit 34, and the pulse motor 5 starts rotating in the forward direction. The character disk 8 also rotates together with the pulse motor 5, and the photo sensor 9
When the rotation pulse enters the comparator circuit 34, it is confirmed that the type wheel 1 has rotated by one pitch, and the numeric signal read by passing through the photo sensor 13 is converted and input to the comparator circuit 34. Therefore, the comparison circuit 34 repeatedly compares the set number and the subtracted value of 4 until the read number matches, and when they match, the output of the comparison circuit 34 becomes 1, and the 0R gate 35 is set to control the pulse motor. It is input into the device 15. Therefore, the pulse motor control device 1
5 reduces the speed of the pulse motor 5 so that it can be braked and stopped immediately. Taking into account the performance of the pulse motor 5, the timing of this brake action is carried out when the set number comes one pitch before the printing position A. Then, from the time of this brake action, the printing wheel 1 is set to 1.
When the pitch rotates further and this is confirmed by the generation of a rotation pulse from the photo sensor 9, the type wheel 1 stops together with the pulse motor 5, and the set number is positioned at the printing position A. To explain the subtraction of the set number and 4 in the control in this case, the photo sensor 13 is located at a position offset by 2.5 characters from the print position A, so in the case of forward rotation, the number at the print position A and the read number There is only a three-letter difference between the two.

Furthermore, from the time when type wheel 1 starts braking until it stops, 1
Since it rotates by the number of characters, there will be a difference of four characters between the number read and the number where the brake is applied. Therefore, by comparing the preset number minus 4 with the read number and applying the brake,
The set number can be reliably stopped at the printing position A. In addition, when rotating type wheel 1 in the reverse direction, there is a difference of two characters between the number at printing position A and the number read, and similarly, one character is required between applying the brake and stopping. Therefore, it is sufficient to subtract 1 from the set number and compare it with the read number, and this operation is performed by the subtraction circuit 29.

Therefore, the numbers set by the fair report input device 14 are 8 and 9.
If it is larger than 7, the output of the gate 28 becomes O, instructing the rotation control circuit 26 to rotate in the opposite direction, and at the same time, the switching gate 33 makes the subtraction circuit 29 conductive to the comparison circuit 34.

Then, when the type wheel 1 is reversed by the pulse motor 5 and a rotation pulse is generated, the comparison circuit 34 compares the set value and the subtracted value of 4 with the number read by the photo sensor 13, and if the two match, the comparison circuit 34 The brake is applied by the output from 34, and the rotation pulse causes the active wheel 1 to stop together with the pulse motor 5 to position the number set at the printing position A. In all of the above explanations, settings are controlled from the state where there is a blank space at printing position A, which is detected by the magnetic sensor 11. However, setting control is performed when there is no blank space at printing position A. Comparing circuits 37 and 38 are provided to perform this.

The comparison circuit 37 compares whether the set number is included in the read number plus 4 and 11. The register 24 and the output side of the S-P converter 36 are connected, one of the output sides is connected to the switching operation side of the switching gate 33, and the other side is connected to the 0R gate 35 and the input side of the comparison circuit 38. Further, the comparator circuit 38 compares the value obtained by subtracting 3 from the set number with the read number, and the register 24 and the output side of the S-P converter 36 are similarly connected to its input side, and its output One side is rotation control circuit 2
6, and the other is connected to the rotation control circuit 26 and the switching gate 3.
It is connected to the switching operation side of No. 3. In this case, the type wheel 1 is rotated in the positive direction by one pitch together with the pulse motor 5 by a starting means (not shown), and after the rotation pulse is generated, the number passing through the photo sensor 13 at that time is read. When the read number and the number set by the information input device 14 meet the conditions of the comparison circuit 37, it is found that if the X type wheel 1 continues to rotate in the normal direction, the set number can be brought to the printing position more quickly. A signal is input to the switching gate 33. Therefore, the subtraction circuit 30 is made conductive to the comparison circuit 34 by the switching gate 33, and from then on, the setting control is performed by forward rotation as already described. Also, the relationship between the read number and the set number is determined by the comparison circuit 3.
If condition 7 is not satisfied, it is determined that it would be faster to stop the type wheel 1 immediately or to rotate it in the opposite direction.

Therefore, in this case, the other output of the comparator circuit 37 becomes 1, is combined with the 0R gate 35, and is inputted to the pulse motor control device 15, which immediately applies the brake and stops the type wheel 1 by means of a rotation pulse. At this time, the output of the comparator circuit 37 is also input to the comparator circuit 38, and the comparator circuit 38 becomes operational, and when the set number and the read number meet the conditions, it is set to the printing position just now. It is determined that the indicated digit is located, one output becomes 1 and is inputted to the rotation control circuit 26, and the type wheel 1 together with the pulse motor 5 is held in a stopped state. However, if the relationship between the set number and the read number does not satisfy the conditions of the comparison circuit 38, the other output signal is input to the rotation control circuit 26 and the type wheel 1 is rotated in the opposite direction.
Then, the subtracting circuit 29 becomes conductive to the comparing circuit 34 by inputting it to the switching gate 33, and from this point on, setting control by reverse rotation as already described is performed. As described above, according to the mechanism of the present invention, no matter from which position the type wheel 1 is set, optimal positioning control is performed based on the relationship between the type code read after the type wheel starts rotating and the target type code. Therefore, it is possible to select the set type within 1/2 rotation to ensure that it is set at print position A, and if the magnetic sensor detects a magnet and the desired type is blank, Since no control is required, the selection time is significantly reduced, especially when one type selection mechanism sequentially selects multiple type wheels. Therefore, printing speed is improved, which is advantageous in terms of device life and power consumption. In addition, in the case of a blank space where printing is frequently performed, the control operation is simplified and the control is based on the blank state, so it is highly practical.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is an explanatory diagram showing the relationship between the type wheel, sensor, and printing position in the apparatus, and FIG. FIG. 3 is a block diagram showing the central control unit in detail. 1... Type wheel, 2... Tooth-shaped peak, 4.
...Gear device, 5 ...Pulse motor, 1
1...Magnetic sensor, 13...Photo sensor, 20...Central control unit, A...
Print position.

Claims (1)

[Claims] 1. By rotating a type wheel, on which a type is engraved on the toothed crest of the outer circumferential surface, via a gear device, one set type is selectively controlled to be positioned at the printing position. A mechanism, in which one of the plural toothed ridges of the type wheel,
A magnetic element is provided to indicate that a predetermined type is present at the printing position of the type wheel, and a corresponding type code is provided on each side of the multi-toothed crest, and the magnetic element is inserted into the type wheel when the type wheel is at rest. The present invention is characterized by being provided with a first detection means that is provided to be able to detect the position of the type wheel, and a second detection means that detects the type code applied to the side surface of the toothed crest of the type ring at the position where the type wheel is in a rotating state. The type selection mechanism of the type wheel.