JPH0427794B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in linear step motors.

Recently, with the automation and unmanned processing of processing and assembly, conveyance devices using linear step motors are being used instead of conveyance means such as belt conveyors due to the demand for improved stopping position accuracy when conveying workpieces. It has become like that.

FIG. 1 is a partial side view schematically showing the structure of a conventional linear step motor (hereinafter referred to as "conventional product").

1 is a primary side magnetic core having a primary side protrusion 11 and a winding portion 12; 2 is a secondary side portion having a secondary side protrusion 21; It is opposed to the origin with a required distance apart. For example, while the primary magnetic core 1 is fixed, the secondary portion 2 is movably disposed, and the primary protrusion 11 is appropriately excited by the winding portion 12. It moves in the horizontal direction as shown by the arrow in Figure 1.

However, in conventional products, the secondary side portion 2 was integrally formed into a flat plate shape from a magnetic material such as iron. For this reason, there was a problem in that the secondary portion 2 could not move on a trajectory that curved at a small radius, except for a trajectory that curved at a large radius. Therefore, there was a problem in that the conventional products could not be used as a conveying device or the like for conveying a workpiece or the like along a trajectory curved at a small radius.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a linear step motor having a secondary side portion that can move on a trajectory curved at a small radius.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a linear step motor according to the present invention (hereinafter referred to as "product of the present invention") will be described below with reference to the drawings.

FIG. 2 is a schematic side view schematically showing the structure of the product of the present invention, and FIG. 3 is a partial side view schematically showing the structure of the main parts of the product of the present invention. Reference numeral 1' denotes a primary magnetic core, which has the same structure as the conventional primary magnetic core 1 described above, and the primary protrusion 11' is appropriately excited by a winding portion 12'. Reference numeral 2' denotes a secondary side portion, which is constructed by connecting a plurality of rod-shaped elements 21' in a substantially endless track shape at a required distance. Rod-shaped element 21'
Two secondary protrusions 21'a are formed in parallel on one side, and connecting members 2 are formed on both ends in the longitudinal direction.
1'b and 21'c are formed to protrude in opposite directions in a direction perpendicular to the longitudinal direction of the rod-like element 21'.
The connecting member 21'b has a single-piece structure, and the connecting member 21'c has a two-piece structure with a gap of the required size (see Fig. 3). round pin holes 21'd, 21'e (fourth
(see figure) have been established respectively. Then, the connecting member 21'b of each rod-shaped element 21' is connected to the adjacent rod-shaped element 2.
As shown in FIG. 3, the connecting member 21'c is inserted into the gap between the connecting members 21'c of 'b and 21'c are rotatably connected. In this way, the secondary side protrusion 21'
A plurality of rod-shaped elements 21' with a facing toward the outer circumferential side.
As described above, the secondary side portion 2' is constructed by connecting the two in a substantially endless track shape.

The secondary portion 2' includes the rod-shaped element 21', its connecting members 21'b, 21'c, and the pin 2'.
1'f constitutes a transmission roller chain.

Therefore, the secondary side portion 2' configured in this way
The primary magnetic core 1' is placed at a required location between the sprockets 3, 4, for example, by extending it around appropriate rotatably arranged sprockets 3, 4, and 5 as shown in FIG. Note that a free roller 6 made of a non-magnetic material (for example, aluminum) is provided below the connecting members 21'b and 21'c of the secondary side portion 2'.
are arranged as shown by the dashed line in FIG. 3 to prevent the secondary side portion 2' between the sprockets 3 and 4 from moving downward. This is sprocket 3,
Even if the secondary side portion 2' between 4 is pulled toward the primary magnetic core 1' by the magnetic force of the primary side protrusion 11', the relationship between the secondary side protrusion 21'a and the primary side protrusion 11' is This is to maintain the separation dimension at a predetermined dimension. Then, when the primary protrusion 11' is appropriately excited by the winding part 12', the secondary part 2' surrounds the sprockets 3, 4, and 5 as shown by the solid line arrow or the broken line arrow in FIG. It will rotate and move in the direction.

As mentioned above, since the secondary side portion 2' operates as a slat conveyor or the like driven by two rows of transmission roller chains, it can be freely conveyed without stress even in narrow places bent at a small radius. . Further, at the bending part, for example, a speedometer or a brake mechanism can be attached to the sprocket to improve the performance of the conveying device.

As described in detail above, the product of the present invention is equipped with a secondary portion that can move on a trajectory curved with a small radius, and can easily stop the secondary portion with high accuracy. Since forward or backward movement can be easily switched and controlled, it can be used as a conveyance device, such as a bucket conveyor, for conveying a workpiece along a trajectory that curves at a small radius.

In the above-mentioned embodiment, each rod-like element 21' is rotatably connected by a pin 21'f to constitute the secondary side portion 2', but the invention is not limited to this, and for example, as shown in FIG. As shown, two or a plurality of rod-like elements 21' are connected to the connecting member 2 at a required distance apart.
A plurality of connected elements 2 connected and fixed by 1″b
Of course, substantially the same effect as in the above embodiment can be obtained even if the secondary side portion is constructed by linking the cylindrical parts 1'' in a substantially endless track shape with the pin 21'f.

Further, in the above embodiment, the primary magnetic core 1' is disposed outside the secondary portion 2' between the sprockets 3 and 4, but the present invention is not limited to this, and the inside of the secondary magnetic core 2', Alternatively, the primary magnetic core 1' may be arranged inside and outside the secondary magnetic core 2'. A side protrusion 21'a is formed.

[Brief explanation of drawings]

Fig. 1 is a partial side view schematically showing the structure of the conventional product, Fig. 2 is a schematic side view schematically showing the structure of the product of the present invention, and Fig. 3 is a schematic diagram showing the structure of the main parts of the product of the present invention. FIG. 4 is a partial plan view, and FIG. 5 is a partial side view schematically showing the configuration of the main parts of another embodiment. 1, 1'... Primary side magnetic core, 11, 11'... Primary side protrusion, 12, 12'... Winding part, 2, 2'... Secondary side part, 21... Secondary side protrusion, 21 '... Rod-shaped element, 21'a... Secondary side protrusion, 21'b, 21'
c...Connection member, 21'f...Pin, 21''...Element connection body, 3, 4, 5...Sprocket, 6...Free roller.

Claims (1)

[Claims] 1 Consists of a primary side magnetic core having a primary side protrusion that is excited by a winding part, and a secondary side part formed by connecting a large number of rod-like elements at a required distance apart, and the rod-like elements are on one side thereof. a secondary side protrusion corresponding to the primary side protrusion in the longitudinal direction, and a connecting member formed at both longitudinal ends of the secondary side protrusion to rotatably connect adjacent rod-shaped elements, and A linear step motor characterized in that the rod-shaped member constitutes a transmission roller chain.