JPS61205157A - Regulation of home position of pulse motor for printer - Google Patents

Abstract

PURPOSE:To raise fixing and holding forces by attaching a type wheel shaft to a motor shaft under a condition that a stronger current than usual printing action is applied to the winding of a pulse motor and the upside of the motor shaft is fixed. CONSTITUTION:A switch 14 is switched to a circuit 16 side for strong excitation, and the magnet 12 of a switching lever 11 is faced a detector 13. At the position, a pulse motor 1 is locked to fix and hold shafts 2 and 10. Under the condition, the hole 21 of a tool 19 is coupled with the stud 8 of the support plate 7 for a shaft 6, and when the tip slit 20 of the tool 19 is matched with a hammer chip 18, the shaft 6 is fixed to the upside of a shaft 2 by a screw 9. Since the tool 19 is formed such that the positions of the hole 21 and the slit 20 are set to bear home position and type wheel in a given phase relationship, when the shaft 6 is fixed to the upside of the shaft 2 and then the type wheel 5 is coupled with the stud 8, the type wheel 5 can be matched with the home position and fixed.

Description

[Detailed description of the invention] Table of Contents - Overview - Field of industrial application - Conventional technology - Problems to be solved by the invention - Means for solving the problems - Effects - Examples - Effects of the invention Overview> The type foil shaft is installed on the motor shaft while the motor shaft is held fixed by applying a stronger current to the specified winding of the pulse motor than during normal printing operation.

<Industrial Application Field> The present invention relates to a pulse motor for a printer, and more particularly to a home position adjustment method for attaching a type foil in a predetermined phase relationship to the home position of the pulse motor.

<Prior art> When a pulse motor is used as a type selection motor for a printer, the type position of the type foil must always be aligned at a constant position when the shaft rotational position of the pulse motor is at the reference position (home position). Must be. The type foil is attached via positioning alignment studs to a type foil shaft, which is connected to the shaft of the pulse motor. Therefore, this type wheel shaft must be fixed in phase with the home position of the pulse motor. Conventionally, when a type foil shaft is installed on the shaft of a motor, the pulse motor is held fixed at the home position by applying the same current to a predetermined winding of the pulse motor as the current during non-printing (idling). Then, an adjustment jig for alignment was engaged with the stand to align the motor shaft and the type foil shaft, and the type foil shaft was screwed and fixed onto the motor shaft.

(Problem to be solved by the invention) In the conventional home position adjustment method, in order to fix and hold the pulse motor at the home position, a weak current, which is the same as the current flowing through the windings of the pulse motor during idling, is passed through. , sufficient fixing force cannot be obtained,
When screwing the type foil shaft, the shaft or alignment adjustment jig sometimes moved, making it impossible to perform accurate adjustment.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to provide a printer pulse motor home that can sufficiently strengthen the force for fixing and holding the pulse motor at the home position, and that can accurately align the phase between the motor shaft and the wheel. This is to provide a position adjustment method.

<Means for Solving the Problems> In order to achieve this object, the present invention provides electricity to a predetermined winding of the pulse motor to fix and hold the shaft of the pulse motor at a predetermined reference position. In a method for adjusting the home position of a pulse motor for a printer on which a type foil shaft is attached, a switch is provided to change the strength of the current to the pulse motor, and the switch is set to the strong current side to apply a strong current to the specified winding. The type foil shaft is mounted on the motor shaft while increasing the holding force of the pulse motor.

(Function) When adjusting the home position, a strong current is applied to the pulse motor to strongly excite the pulse motor using the current selector switch, and the pulse motor is fixed and held with strong force, locking its shaft.

<Example> The configuration of a pulse motor according to the present invention is shown in FIG. A type foil shaft 6 is fixed to a motor shaft 2-H in front of the pulse motor 1 with a screw 9. The type foil shaft 6 has a support plate 7, on which the type foil 5 is mounted in alignment with an alignment stud 7 formed on the support plate 7. 4 is in print. A home position detection lever 11 is mounted on the motor shaft 10 at the rear of the pulse motor 1. This lever 11
A magnet 12 is fixed to the end of the printer, and a magnet sensor 13 is fixed to the printer main body to detect the magnet 12. A current switching switch 14 is provided on the operation panel (not shown) of the printer, and the weak current during idling is switched to the windings of the motor stator (not shown).
A weak excitation circuit 15 is used to energize the motor stator, and a strong current is applied to a predetermined winding of the motor stator. It is connected to a strong excitation circuit 16 for energizing a wire (not shown) and can be selectively switched.

When adjusting the home position, the selector switch 14 is switched to the strong excitation circuit 16 side. The pulse motor 1 is locked at a position where the magnet 12 of the home position detection lever 11 faces the magnet detector 13 (home position W), and the shafts 2 and 10 are held fixed. In this state, the alignment adjustment jig 19
(FIG. 2) is engaged with the stand 8 of the support plate 7 of the type foil shaft 6, and the tip slit 20 of this jig 19 is inserted into the hammer tip 18 of the printing hammer device 17.
The type foil shaft 6 is fixed onto the motor shaft 2 by screws 9 in alignment with the screws 9. In this alignment adjustment jig 19, the positions of the hole 21 for holding the stand and the tip slit 20 are formed in advance so that the home position of the motor and the type foil have a predetermined phase relationship. After being fixed on the motor shaft 2, the type foil 5 (FIG. 1) is engaged with the stud 8 and mounted, so that the type foil 5 can be fixed at a predetermined home position.

<Effects of the Invention> When the type foil shaft is mounted on the motor shaft when adjusting the home position, the motor shaft is locked with a strong force, so that the adjustment work can be performed accurately and quickly without moving during the work.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a pulse motor according to the present invention, and FIG. 2 is an explanatory diagram of an alignment adjustment jig according to the present invention. ■... Pulse motor, 2.10... Motor shaft, 5... Type foil, 6... Type foil shaft, 9... Screw, 14... Changeover switch,
15... Strong excitation power supply, 16... Weak excitation power supply.

Claims (1)

[Claims] 1. In a method for adjusting the home position of a pulse motor for a printer, the shaft of the pulse motor is fixedly held at a predetermined reference position by energizing a predetermined winding of the pulse motor, and the shaft of a type foil is mounted on the shaft.
A switch is provided to change the strength of the current to the pulse motor, and the switch is switched to the strong current side to apply a strong current to the predetermined winding to increase the fixing force of the pulse motor. A method for adjusting the home position of a pulse motor for a printer, which is characterized by being mounted on a shaft.