JPS622954Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving device for a moving body that reciprocates on a straight line and receives positioning control.

Generally, this type of moving body is applied to, for example, a printer head or an information retrieval device of a computer.
A moving body such as a printer head is sequentially positioned at a designated location and driven, and there is a tendency for a linear pulse motor to be used as a drive means for performing open-loop control. At this time, in the conventional device, a linear pulse motor scale having equally spaced teeth is fixed, and a magnetic flux generating device with different tooth pitches is used as a movable element to face the teeth of this scale and generate this magnetic flux. The printer head or information retrieval device is attached to the device to drive it and perform positioning control. When using a linear pulse motor in this way, the weight of the magnetic flux generator of the linear pulse motor is larger than the moving object such as a printer head to which it is attached, resulting in large inertia, and the need to move the moving parts. Due to the limited output based on the length of the magnetic flux generator in the moving direction of the moving body, a large thrust cannot be obtained and the responsiveness of the positioning drive is lacking. When doing so, the magnetic flux generated from the magnetic flux generating device has a serious effect, and the power supply line to the movable part must be expanded or contracted by a length corresponding to the stroke.

The purpose of this invention is to move a steel belt in which slots for steel teeth are continuously punched out by changing the magnetic flux of the teeth of a magnetic flux generator in a fixed state, and to fix a movable object in an appropriate position on the steel belt. By doing so, it is an object of the present invention to provide a driving device for a moving object that eliminates all of the above-mentioned conventional drawbacks, has good positioning responsiveness, does not exert any magnetic influence on the moving object, and eliminates the structural complexity associated with the power supply line. .

Hereinafter, an embodiment in which the present invention is applied to a printer will be described in detail. Figure 1 is a schematic diagram of the main parts of a printer implementing the present invention, and in Figure 1,
Reference numeral 1 denotes a steel belt, a part of which is attached to the stepping pitch tooth portion 1 of the linear pulse motor to perform the scale action of the linear pulse motor, as shown in Fig. 2.
A movable element for a linear pulse motor is formed by continuously forming a through-groove 1b in a, and is made of a magnetic material. The steel belt 1 is engaged with the wheels 2, 2' and is formed into an annular body, with both ends thereof being connected via a spring 3. This spring 3 applies tension to the steel belt 1, and thereby each wheel 2,
Reliably prevents sagging between 2'. Reference numerals 4 and 4' denote magnetic flux generating devices, which form a stator of a linear pulse motor by having the steel belt 1 interposed therebetween, with their teeth facing each other and not in contact with the steel belt 1, the basic configuration of which is shown in Figure 3. Shown below. That is, tooth parts 4a1 and 4a2, which are, for example, half a pitch larger than the pitch of the tooth part 1a of the scale, are attached to both ends of the permanent magnet 4b, and each tooth part of each pole is provided with a winding 4c that is excited to a different polarity. There is. and the above winding 4
Alternately excite C and scale 1 in 1/4 pitch increments.
I will send you Reference numeral 5 denotes a head for a printer, and is attached to a steel belt 1 as a movable element, which forms the scale of a linear pulse motor, at a location where a spring 3 is present. Reference numeral 6 denotes a printer platen, on which printing is sequentially performed on sheets of paper on the surface thereof, accompanied by the action of the head 5. 7 is an operating knob for the platen 6.

In the configuration of the above embodiment, the scale of the linear pulse motor can be adjusted by energizing the coils 4a1 and 4a2 of the magnetic flux generators 4 and 4' forming the linear pulse motor stator in a predetermined order. The steel belt 1, which serves as a movable element, starts to move in the direction of the arrow Y1, for example, by the number of steps corresponding to the pulses supplied to the magnetic flux generators 4 and 4', and in conjunction with this, the head 5 moves in the direction of the arrow Y2. I will do it. Furthermore, by applying pulses to the magnetic flux generators 4, 4', the head 5 can be driven in the direction opposite to the arrow Y2 by moving the steel belt in the direction opposite to the arrow Y1. In this way, the head 5 moves by a distance regulated by the number of input pulses, and positioning control is completed. After this positioning is completed, printing is performed at a predetermined position by the action of the head 5.

In the above description, an example is shown in which the present invention is applied to a positioning drive device for a printer head. Needless to say, it can be applied to all devices that are used. Also, linear pulse motor 1
A magnetic flux generating device 4 forming a stator as a component,
It is also possible to replace either one of 4' with a magnetic material that simply serves as a magnetic flux path. On the other hand, the tensile force applied to the steel belt 1 as a movable element that acts as a scale is not limited to the spring, but can also be applied, for example, to a structure that applies force in the direction of separating one of the supporting wheels 2 and 2' from the other. can also be achieved.

As described above, in the driving device for a moving object according to the present invention, when positioning and driving the moving object using the power of the linear pulse motor, the slot corresponding to the step pitch of the linear pulse motor is continuously formed as a through groove. A magnetic flux generator for a linear pulse motor is placed on a part of a flexible annular steel belt made of a magnetic plate without touching the belt, and the head of a printer or the like is placed in an appropriate place where there is no room to face the magnetic flux generator of the steel belt. The movable body as the positioning controlled body is fixed, and the scale side of the linear pulse motor is driven. Based on this configuration, the inertia of the movable part should be extremely small in relation to the fact that the weight of the belt that acts as a scale is small compared to the weight of the magnetic flux generator that forms the stator of the linear pulse motor. Can be done. On the other hand, since the length of the magnetic flux generator in the belt traveling direction can be increased, an increase in thrust can be expected. Therefore, the ratio of the thrust force to the weight of the movable part can be significantly increased compared to the conventional configuration, so there is a great practical benefit of improving the responsiveness required for drive devices such as printer heads. It is. Furthermore, when driving a moving object that dislikes magnetism, since the moving object is isolated from the magnetic flux generator, there is little possibility that the moving object will be affected by magnetism, so there will be no problems with the magnetic flux generator. Since there is no room for providing a means for expanding and contracting the power supply line to the power supply line, the configuration in this respect can be simplified, and this provides excellent features.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the main part of an embodiment of the present invention, FIG. 2 is a plan view of one component, and FIG. 3 is a cross-sectional view of one component. 1: magnetic belt, 4, 4': magnetic flux generator, 2, 2' wheels, 5: printer head,
3...Spring.

Claims (1)

[Claims for Utility Model Registration] 1. A belt made of a magnetic material in which slots corresponding to the stepping pitch of a linear pulse motor are continuously formed as through grooves, means for supporting the belt in a circular path so that it can circulate freely, and this belt. means for applying tension to the belt, the annularly supported belt is used as a movable element of a linear pulse motor, and teeth of a magnetic flux generator forming a stator of the linear pulse motor are opposed to a part of the belt. A driving device for a movable body, the movable body being fixed at a position on the belt and not facing the magnetic flux generating device. 2. The driving device for a moving body according to claim 1, wherein a spring is interposed in the belt as means for applying tension to the belt. 3. A moving body according to claim 1 of the utility model registration, which uses a plurality of wheels as a means for supporting the belt in a circular path so as to be able to circulate freely, and the axis of one of the wheels is movable to apply tension to the belt. drive unit.