JPS6076370A - Adjusting device for position of stoppage of type-wheel in printer for business machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type wheel stop position adjusting device in a printing device for office equipment.

In a printing device that uses a type wheel, when selecting the printing position on the type wheel and printing, due to errors (misalignments) in the mounting positions of each component, the raised characters on the type wheel may not be hammered correctly. If the positions are not facing each other, there will be unevenness in the quality of the printed characters such as missing characters, blurring, and irregularities on the printed characters, and the finish will be unsightly.For example, when this magnetic printing part is set in a reader. If the reading operation is carried out after reading the information, it may cause a read error, resulting in a major hindrance to subsequent administrative processing. For this reason, it is desirable that the character position of the type wheel is always stopped at a regular position. Conventionally, in this type of printing device, various operations were required to ensure the correct position of the type wheel by finely adjusting the setting of the type wheel and correcting the mounting position of the screen and other parts. However, the conventional adjustment method requires a high degree of skill, takes a lot of time for this adjustment, and requires a lot of effort to maintain uniform print quality.

The type wheel stop position adjusting device according to the present invention has a two-way sensor unit at one end of the shaft, and a two-way sensor unit.
vy, A sensor plate with a single slit cut out to serve as the starting point for counting, and a rotating shaft with a type wheel fixed to the same axis are controlled by a motor drive circuit whose stop position of the motor is regulated in advance. The motor is rotated by a stepping motor driven by a rotating shaft, and a rotary switch is incorporated into the circuit that can increase or decrease the -C motor stop position in units of one pulse. By enlarging it as much as possible, the rotation angle of the rotation axis sent by one pulse, and thus of the type wheel, is preset to a small value, and the slight change in the rotation axis angle is linked to fine-grained and subtle corrections of the stop position of the type wheel. . In other words, by interlocking and incorporating a rotary switch into the stepping motor's drive circuit, which allows the stop position of the type wheel to be increased or decreased in 1-pulse units, the conventional cumbersome mechanical operation is replaced with a manual operation that relies on feel. The purpose of this invention is to quickly, easily, and accurately accomplish this type of adjustment work, which requires a high level of skill, by simply operating a rotary switch. I will explain.

A sensor plate (5) with a single slit (4) cut out near one end of the rotating shaft (3) supported between a pair of inner and outer frames (1) (21) serves as a starting point for counting the number of pulses. )
is fixed, and the photo sensor unit (7) is arranged in a manner that hugs the edge of this sensor plate (5), and the "C"
There is.

In addition, the rotating shaft (3) has a plurality of main type wheels (8) that can display °C printing in special magnetic characters that can be read with a reader, for example, and a date type wheel (9).
, auxiliary type wheels (+0) (+n) are fixed respectively, and each type wheel has a corresponding solenoid (12i
The hammer guide (1
A hammer (1ω) that can be retracted from .

A toothed booby IJ- (19) is fixed to one end of the rotating shaft (3), fixed to the inner frame (1), and connected to a motor drive circuit programmed to stop rotation every predetermined number of counted pulses. A toothed pulley (21) is also attached to the stepping motor (20) that is controlled and driven based on the
At this time, the circumference of the toothed pulley (19) on the rotating shaft side is twice the circumference of the toothed pulley (21) on the motor side, and Belt with (
The rotation of the stepping motor is via the rotating shaft (
3) is transmitted after being decelerated. Furthermore, in the motor drive circuit that controls the stepping motor (A), a rotary switch is installed on the CPU board (A) to operate in conjunction with the motor drive circuit in order to change and correct the stored motor stop position. There is.

In the present invention having the above configuration, to continue to explain a more specific embodiment with specific numerical values, the stepping motor (A) for driving a type wheel is 4.
The circuit is configured to rotate by ``C1'' at 00 parnu,
The rotation of the motor (A) is decelerated by IA between the toothed pulleys (11 (211) and transmitted to the rotating shaft (3). Therefore, the rotating shaft (3), and hence C, is connected to each type of wheel (8) to (211).
11) The motor (A) rotates twice in the period of one rotation.

In other words, the rotation angle of the type wheels (8) to (11) that rotate with one PALNU applied to the motor (A) is 860'/
A minute rotation angle of 400X2 = 0.45° can be obtained. In the present invention, each type wheel (8) ~
The entire circumference of (11) is equally divided into -(16 characters), so the rotation angle required to send one character on the type wheel is 860 degrees 16 = 22.5 degrees, The number of motor-driven varnes required to send one wheel character is necessarily 22.510.45=50 (parnus).

The photo sensor unit (7) set corresponding to the sensor plate (5) fixed to the rotating shaft (3) detects one slit (4) carved in the sensor plate (5) and then The number of pulses is counted, and the motor (A) is controlled to stop when the predetermined number of pulses is reached.
There is C. By adjusting this predetermined number of pulses, 0.
Type wheel (8) to (
11) The stopping position can be finely adjusted.

Approximately accurate printing can be expected by applying a predetermined number of pulses stored in advance, but fine adjustment of the type wheel to the desired stop position by observing the actual printing results is performed using a stepping motor installed on the CPU board. This is carried out by changing the settings of a rotary switch that is linked to a drive circuit and allows the number of character position selection pulses to be increased or decreased pulse by pulse. When this switch is configured with a hexadecimal rotary switch, the center value 8 of the switch is located at the center display position (support) of the rotary switch, and the center value 8 of the switch is set to a predetermined value in advance. Therefore, when position 8 of this switch is used as the standard setting value, the adjustment range of the wheel is ±87-steps (±0
．． 45°×8=±3.6°).

If, as a result of printing, the amount of rotation of the type wheel on the hammer is insufficient and a blurred area is visually confirmed in the trailing part of the print, increase the number of pulses, that is, change the setting position of the rotary switch. By increasing the setting change and memory correction to 9 or 10, etc., a slight rotation of the type wheel in 0.45° increments is ensured.

According to the present invention, extremely detailed and highly accurate stop position correction work for type wheels can be quickly carried out by the very simple means of switch adjustment 4C, and is not particularly affected by differences in skill. , can ensure homogeneous coordination on site.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of the present printing apparatus, FIG. 2 is a right side view thereof, and FIG. 3 is a view taken along line A--A in FIG. 2. In the figure, (3) is the rotation axis, (4) is Nuri), (5) is the sensor plate, +7) is the photo sensor unit, (8) ~
(11) is a type wheel, (161 is a hammer, (field is a toothed pulley, ■ is a stepping motor, (21)
is a toothed pulley, (support) is a toothed pel) 1. (24) indicates a rotary switch. Figure 2 ρ-B1) Figure 3

Claims (1)

[Claims] (1) The rotating shaft has a sensor plate with a slit cut into the shaft that corresponds to the photo sensor unit and serves as the starting point for pulse count, and a type wheel is fixed to the shaft, and the stop position of the motor is regulated in advance. The stepping motor controlled and driven by the motor drive circuit rotates by °C, and a rotary switch is interlockably incorporated into the circuit, which can increase or decrease the stop position of the motor in units of one parnu. Features: Type wheel stop position adjustment device for printing equipment for office equipment.