JPS6384955A - Initialization method of type wheel in printer - Google Patents

Abstract

PURPOSE:To allow a type wheel to be set to a prearranged rotational position by measuring a minimum pulse interval which is output from a sensor, counting pulses having intervals within the limits of an interval twice said minimum pulse interval measured and accepting the counted pulse as a pulse which is output from an end detection part immediately after not counting the pulses having intervals within the limits of an interval twice the minimum pulse interval. CONSTITUTION:Ten pulses generated by transmission of light from an optical sensor 14 through each slit 11, 12, 13 are sequentially output from a light-receiving device 14B to a control 15 to select a minimum pulse interval 't0' from among 9 pulse intervals. Then pulses having intervals within the limits of less than twice the 't0' are checked by the control 15. Since an interval between the slits 12, 13 and that between the slits 13, 11 are equivalent to a value of 2 X 't0' or more, the pulse interval formed via the slits 11, 12 is checked so that the slit 11 may not be erroneously accepted as an end pulse, even when the 10th pulse is detected from the slit 13. Passage of each slit 11, 12 past the position of a light-emitting device 14A is checked, and later a pulse which is initially output from the light-receiving device 14B is accepted as a pulse formed through the slit 13 to stop the operation of a drive source and set 'wait' mode.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of industrial application) The present invention provides a method for starting a printer by positioning a type ring in a predetermined position on the outer circumferential surface of which two typefaces are formed. This invention relates to a method for initializing a type wheel in a printer.

[Conventional technology]

In the printer using the type wheel described above, the type wheel is arranged on the JQ so that it can rotate only in one direction, and a sensor plate is attached to the type wheel, and the sensor plate outputs pulses from the sensor when the detection part faces the sensor. a detection unit for detecting a print position, which is disposed coaxially with the shaft, and includes a plurality of main detection units arranged in series in the circumferential direction at ζ9t, corresponding to each of the print types, and a printer; and a detection section for generating an end pulse to notify the end of the operation (time to cut off power supply to the motor), and each main detection section of the type wheel and the sensor plate is opposed to the sensor. A pulse output from the sensor causes the printer to stop at a predetermined position and print is performed, and a pulse output from the end pulse detector ends the operation of the printer (the motor is de-energized).

[Problem that the invention seeks to solve]

By the way, in the above-mentioned printer, in order to initialize it, an end pulse detection section is required which is independent of the main detection section for detecting the position of printed characters. Therefore, the F3 structure is superior and requires an expensive detection device. 2 (Ill must also be used.

In view of these points, it is an object of the present invention to provide a method for initializing a type wheel in a printer in which accurate printing is performed by positioning the type wheel at a predetermined rotational position.

Means for Solving Problem C] The present invention provides a type wheel having a plurality of type bodies formed on its outer peripheral surface and arranged so as to be rotatable in one direction, and a type wheel that rotates in synchronization with the type wheel in the same direction. and a sensor plate which is arranged so that the detecting parts face the sensor and outputs pulses from the sensor, and the detecting parts are arranged in succession at equal intervals in the circumferential direction and correspond to each of the printed characters. ? ! and an end detection section for initial position detection arranged at an interval of 2-8 or more, which is the interval between the main detection sections from the end main detection section, and , in a printer in which each main detection part of the sensor plate is opposed to the sensor and is stopped at a predetermined position and printed by a pulse output from the sensor, the sensor plate is rotated to output the output from the sensor. The minimum pulse interval is measured by counting the plurality of pulses that have been generated, and the pulses having an interval within 218 intervals of the minimum pulse interval are counted at least once, and the pulse interval is twice the minimum pulse interval. Recognizing the pulse counted immediately after not counting the interval pulse as the pulse outputted by the end detection section facing the sensor,
It is characterized in that the type wheel and the sensor plate are stopped.

[For production]

According to the present invention, maf? ! Count 2B pulses to measure the minimum pulse interval, that is, the interval between the main detection parts, and then count 11 pulses at least once during an interval that is twice the minimum pulse interval, and calculate this difference. −z [
a L/, and then reconfirm the existence of the α main detector. Furthermore, by not counting pulses for an interval twice the minimum pulse interval, it is confirmed that the main detector is no longer present, and immediately after that, the end detector outputs the pulses facing the sensor. The type wheel is initialized by recognizing the pulse as a pulse, and stopping the type shaft and sensor toe at the initial position.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 2 schematically shows a printer for carrying out the type wheel initialization method according to the present invention.
For example, 181 type wheels 2, 2, . Each type ring 2 has a disk shape of about t, and has, for example, 12 type bodies 3.3 on its outer peripheral surface.
... is formed. Also. In front of the printed character @1 is this printed character @! A hammer shaft 4 parallel to 11 is arranged,
This hammer shaft 4 has a pair of brackets 5 spaced apart from each other.
．． 5 are provided so as to protrude in the same direction in the circumferential direction, and a hammer 6 in the shape of a cylindrical ring is horizontally suspended between both brackets 5.5. This hammer 6 is brought into pressure contact with each type wheel 2 by rotation of the hammer shaft 4 in the direction of the arrow, and the type on the type wheel 3 facing the hammer 6 of each type wheel 2 is pressed between the hammer 6 and the type '? 'Printing is performed on a paper (not shown) held between two shafts.

At the rear of the type shaft 1, a cam shaft 7 is provided with a cam for controlling a selection pawl (not shown) for locking the type shaft 2 in a state where a desired type body 3 is opposed to the hammer 6. It is arranged parallel to @1, and this camshaft 7
and a transmission gear 8 which meshes with each other at the end of the type shaft 1.
A transmission gear 9 is fitted. Further, the camshaft 7 is rotated in the direction of the arrow by a drive source (not shown), and the rotation of the cam @7 is transmitted to the type @1 by both transmission gears 8 and the third transmission gear 9, and the cam For every rotation of the shaft 7, the type shaft 1 is rotated twice in the direction of the arrow. The reason why the type @1 rotates twice in one printing is because the desired type 3 of each type wheel 2 is set in the first rotation, and the initialization of each type wheel 2 after printing is performed in the second rotation. This is to do this.

A disk-shaped sensor plate 10 is fitted to the end of the camshaft 7 so as to be able to rotate integrally with the camshaft 7, and the outer peripheral edge of the sensor plate 10 has the two printed characters. The total number of letters in rings 2 and 2 is 3.3 taro 24fl! Slits 11, 11, . . . , which are the main detection portions of if, are formed at equal intervals in the circumferential direction. Furthermore, adjacent to the m-end sleeves 1 to 11 in the rotational direction of the sensor plate 10, a slit 12, which also serves as a main detection portion, is formed with a spacing equal to the spacing of the slits 11 and 11. And these slits 11
The angle θ between the tip of the slit 12 and the slit 12 is approximately 1
It is said to be 30 degrees. Furthermore, a slit 13 for initial position detection is formed behind the slit 12 at an angle of about 2001 degrees in the rotation direction of the temporary 10 of the sensor 1 . On the other hand, on both sides of the Sensugi board 10, a light emitter 14A and a light receiver 1 of an optical sensor 14 as an example of a sensor are provided.
4B, of which a light emitter 14A emits light in the direction of the sensor plate 10. The light from this light emitter 14A is transmitted through each slit 11.
12.13 faces this light emitter 14A, it passes through each slit 11.12.13 and reaches the light receiver 14B,
Pulses are output from the light receiver 14B. The pulses from the light receiver 14B are input to a control section 15 that controls the printer, and the control section 15 performs various controls.

Next, an embodiment of the method of the present invention will be described based on the above-described configuration.

First, when the power is turned on as shown in step ST1 to start the printer, in this state, the type wheel 2
Since it is not certain in what state fS the sensor fffi10 is stopped, initialization is performed to prevent erroneous printing, and as shown in step ST2, a motor (not shown) for rotationally driving the cam @7 is activated. A drive source such as the one described above is activated, and the type shaft 1, which is connected to the camshaft 7 through both transmission gears 8.9, is synchronously driven to rotate.

And light emission from the optical sensor 14 as the Senna plate 10 rotates? The light irradiated from n 14 A in the direction of the sensor plate 10 passes through each Surin 1-11, 12, 13 and reaches the light receiver 14.
Sequentially receive 10 pulses generated when reaching B 3
14B to the control unit 15, the control unit 15 converts the 10 fll pulses from 1 to 1 and calculates the minimum pulse interval (1o) from among the 9 pulse intervals of these 10 pulses: l, 1. (Step 5T3). This minimum pulse interval (to) is nothing but the pulse interval in the slits 11 and 12. next,
As shown in step ST4, 2 of the pulse intervals (1) with the smallest pulse interval among the pulse intervals of the pulses output from the light receiver 314B following the above-mentioned 10 pulses.
The controller 15 confirms at least one item within f8, that is, 2×to.

Distance between slit 12 and slit 13 and slit 13
Since the interval between the slits 11 and 11 is greater than or equal to 2×1o, in step ST4, when the 10th pulse for measuring the 9 pulse intervals is detected from the slit 13, the b slits are 11 to End Pulse (Surin h
13) and ;'7 +L2 L/ In order to avoid this, perform an i1 operation to confirm the existence of a pulse interval due to the pulses formed through the rib 1-11 and the slit 12. Thereafter, as shown in step ST5, the turtle control unit 15 controls the light receiver 14B between 2xto or more.
After confirming that no pulse has been input from the main detector, it becomes clear that the slits 11 and 12 forming the main detection section have already passed the position facing the light emitter 14A. Then, first the light receiving knee i 14
The pulse outputted from B to the ill M section 15 is recognized as the pulse formed through the slit 13, the initial i1 conversion is completed, the drive source is stopped (step 5T6), and the state is set to standby for actual printing work. (Step 5T7).

In actual printing work, the slit 11 corresponding to the set number etc. is the light emitted by the optical sensor 14: a14Δ
When a pulse is output from the light receiver 14B opposite to , a solenoid (not shown) is energized, and the typeface 3 such as the number set in C faces the hammer 6 (at the Q position, the typeface is changed by the action of a selection claw (not shown). Constrain the rotation of 3. And,
When the pulse formed through the slit 11 next fff to the corresponding slit 11 is output from the receiver 14B, the solenoid is deenergized. Note that the slit 12 is
This is for deenergizing the solenoid which is energized by the slit 11 at the end.

In this way, a predetermined type body 3 of each type wheel 2 is attached to the hammer 6.
When the hammer shaft 4 is rotated once, the hammer 6 is pressed against the type body 3 of each type wheel 2, and paper (not shown) is sandwiched between the type ring 2 and the hammer 6 to mark the paper. Do this.

According to the embodiment described above, the slit 1 for initial position detection
3 can be accurately detected and the type spindle 2 and sensor plate 10 can be initialized, so that no matter what condition the type wheel 2 and sensor plate 10 are stopped, accurate printing can be performed the next time. Can be done. In addition, in the example of the Kizunabo, a sensor tf10 is attached to the camshaft 7, and since this cam 17 rotates only once in one printing, the sensor plate 10 is attached to the typeshaft 1. In contrast to conventional methods, where the second unnecessary pulse had to be ignored or interrupted, the advantage is that no stationary pulses are generated.

In addition, in the above-mentioned embodiment, the detection parts of the sensor plate 10 were explained as Slins 1 to 11, 12, 13, but the detection parts were made into protrusions, and the protrusions were used to emit light by blocking the light from Sl 4A. It may also be configured to generate pulses. Further, the sensor is not limited to the optical sensor 14, and furthermore, the present invention is not limited to the embodiments described above.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to stably perform initialization to position the type shaft at a predetermined rotational position when the printer is started, and to perform accurate printing.

[Brief explanation of the drawing]

FIG. 1 is a flow chart showing an embodiment of a method for initializing a type wheel in a printer according to the present invention, and FIG. 2 is a direct perspective view of a printer for carrying out the method shown in FIG. 1... Type shaft, 2... Type wheel, 3... Type font, 4
...Hammer shaft, 6...Hammer, 7...Cam shaft, 1
0...Sensor plate, 11,12.13...Surin 1-
114... Optical sensor, 14A... Light emitter, 14B.
... Light receiver, 15... Control unit. Applicant's agent Shunsuke Nakao Procedural amendment October 23, 1985 Commissioner of the Japan Patent Office Kuro 1) Toshio Akira 1 Display of the case 1985 Patent application No. 230150 2 Name of the invention Initializing the type wheel in a printer Method 3 Relationship with the case of the person making the amendment Patent applicant (AO9) Alps Electric Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] A type wheel with a plurality of type bodies formed on the outer circumferential surface and rotatable in one direction, and a detection part facing the sensor that is also rotatable in one direction in synchronization with the type wheel. It has a sensor plate from which pulses are output from the sensor,
The detecting section is separated from a plurality of main detecting sections arranged at equal intervals in the circumferential direction and corresponding to each of the printed characters at an interval that is at least twice the distance between the main detecting sections from the main detecting section at the end. and an end detection section for detecting the initial position arranged, and the type wheel is stopped at a predetermined position by a pulse output from the sensor by making each main detection section of the sensor plate face the sensor. In a printer configured to perform printing, the sensor plate is rotated and a plurality of pulses output from the sensor are counted to measure the minimum pulse interval, and an interval within twice the minimum pulse interval is determined. pulses are counted at least once, and the pulses counted immediately after no pulses are counted during an interval twice the minimum pulse interval are recognized as pulses outputted by the end detection section to the sensor. . A method for initializing a type wheel in a printer, comprising stopping the type wheel and the sensor plate.