JPS6145710Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a protective cover for a motor, particularly a protective cover for a motor used in a V-belt transmission sewing machine.

Conventional devices of this type include those shown in FIGS. 1 to 3. FIG. 1 is a partially cutaway front view showing a sewing machine driving device. Reference numeral 10 is a sewing machine table, and a sewing machine 12 is fixed to the upper surface of this sewing machine table 10, and a clutch motor 14 is fixed to the lower surface. The sewing machine 12 is provided with a sewing machine pulley 16, and the output shaft of the clutch motor 14 is provided with a pulley 18, both of which are connected by a V-belt 20. 22 is a protective cover, and at the bottom there is a belt detachment prevention plate 2 for preventing the V-belt 20 from falling off.
4 is provided. FIG. 2 is an enlarged side view of the protective cover 22, and FIG. 3 is a sectional view taken along the line -- in FIG. A vertically oblong circular long hole 26 is bored in the lower part of the protective cover 22. A belt removal prevention plate 24 is located on the back side of this long hole 26, and a washer 28 and a bolt 30 are installed from the front side to prevent the belt from coming off. Board 24
can now be fixed. Further, 32 is a V-groove around the pulley 18.

Next, a conventional method of attaching the protective cover 22 will be described. A V-belt 20 is placed between the sewing machine pulley 16 and the pulley 18 provided on the output shaft of the clutch motor 14. Next, the belt detachment prevention plate 24 is fixed to the elongated hole 26 of the protective cover 22 with bolts 30, and the protective cover 22
is fixed to the clutch motor 14. After that, loosen the bolt 30 and insert the belt detachment prevention plate 24 into the long hole 26.
direction, and fix the belt detachment prevention plate 24 with a gap of several mm between the circumferential surface of the V-belt 20 and the belt detachment prevention plate 24.

For reference, the effect of this belt slip-off prevention plate 24 will be described below. That is, repairing the sewing machine 12,
For adjustment etc., move the sewing machine 12 to the sewing machine table 10.
It may be removed from the sewing machine table 10 or tilted on the sewing machine table 10. At this time, the V-belt 20 is removed from the sewing machine pulley 16. At this time, the V-belt 20 slackens as shown by the dashed line in FIG.
Since the belt 20 is wrapped in the V groove 32 at the bottom of the pulley 18, the V belt 20 is attached to the sewing machine pulley 1 again.
6, it can be easily done without having to be careful about the V-belt 20 coming off on the clutch motor 14 side, so it has excellent workability.

In the conventional protective cover 22, the bolts 30 must be fixed with a spanner or the like according to the outer diameter of the pulley 18, which not only makes the work difficult, but also reduces the V.
It was difficult to check the gap between the belt 20 and the belt detachment prevention plate 24.

The present invention was developed in view of the conventional problems mentioned above, and its purpose is to improve workability by making it easier to install and adjust the belt detachment prevention plate, and to improve industrial efficiency by reducing the number of parts. An object of the present invention is to provide a protective cover for a motor that achieves the following.

In order to achieve the above object, the present invention provides that the protective cover is provided with a pair of vertical long holes symmetrically across the perpendicular line of the motor axis, and the outside of each long hole is A plurality of locking grooves are provided at desired intervals in the longitudinal direction, and the belt detachment prevention plate includes a pressure contact plate hanging downward from the prevention plate for pressure contact with the inner surface of the protective cover, and a pressure contact plate on the side of the prevention plate. a locking protrusion that extends with flexibility and locks in a biased state with the locking groove of the elongated hole; and a locking protrusion extending outward from each of the locking protrusions to protrude from the outer surface of the protective cover. The belt detachment prevention plate can be selectively locked in a desired locking groove from outside the protective cover.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

The present invention is shown in FIGS. 4 to 6, and the same members as in FIGS. 1 to 3 are given the same reference numerals and their explanations will be omitted.

FIG. 4 is a side view of the protective cover 22 corresponding to FIG. 2, and the protective cover 22 is provided with a pair of vertically elongated holes 26 symmetrically across the perpendicular line of the axis of the clutch motor 14. , a plurality of locking grooves 34 are provided on the outside of each elongated hole 26 at equal intervals in the longitudinal direction thereof.

Further, FIGS. 5 and 6 show the belt detachment prevention plate 24 according to the present embodiment, and the fourth
FIG.

The belt detachment prevention plate 24 includes a pressure contact plate 36 that is vertically disposed downward from the prevention plate 24 in order to press against the inner surface of the protective cover 22, and a pressure contact plate 36 that flexibly extends to the side of the prevention plate 24 and has the elongated hole 26. It consists of a locking protrusion 38 that locks with the locking groove 34 in a biased state, and a protruding piece 40 that extends outward from each of the locking protrusions 38 and projects on the outer surface of the protective cover 22, The locking protrusion 38 and the protruding piece 40 are made of flexible synthetic resin.
FIG. 6 shows a sectional view taken along the - line in FIG. 4. Further, in FIG. 5, F indicates the force when gripping the protrusion 40, and E indicates the biasing force.

In the case of the protective cover 22 formed in this way, when the projection piece 40 is grasped and deformed inward, the locking groove 34 of the protective cover 22 and the locking protrusion 38 of the belt detachment prevention plate 24 are engaged with each other. The stop is released, and the belt detachment prevention plate 24 can be moved in the vertical direction.
By releasing the projecting piece 40 at the appropriate position, the belt detachment prevention plate 24 is locked to the protective cover 22.

In this embodiment, a motor driven by belt transmission is shown, but the same effect can be achieved even if the motor is driven by flat belt or round belt transmission.

In the present invention, since the belt detachment prevention plate 24 can be fixed to the protective cover 22 only by the biasing force of the locking protrusion 38, attachment and adjustment can be performed extremely easily. Furthermore, since the distance between the belt slip-off prevention plate 24 and the V-belt 20 can be seen through the elongated hole 26, adjustment is easy. Furthermore, by reducing the number of parts, productivity can be improved and the product can be provided at low cost.

As described above, the present invention is highly practical and contributes to improved workability and productivity.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional device, in which Figure 1 is a partially cutaway front view, Figure 2 is an enlarged side view of the protective cover, and Figure 3 is a cross-sectional view taken along the line - - in Figure 2. 4 to 6 show the present invention, in which FIG. 4 is a side view, FIG. 5 is a sectional view taken along the line - - of FIG. 4, and FIG. FIG. The same members in each figure are given the same reference numerals, 14 is the motor, 20 is the V-belt, 22 is the protective cover, 24
26 is a long hole, 34 is a locking groove, and 38 is a locking protrusion.

Claims (1)

[Scope of utility model registration request] A protective cover for a motor that is used for a belt-driven motor, has a vertically long hole drilled in the lower center of the motor, and fixes a plate to prevent the belt from coming off inside the hole.
A pair of vertically elongated holes are drilled in the protective cover symmetrically across the perpendicular line of the motor axis, and a plurality of locking grooves are formed outside each of the elongated holes at desired intervals in the longitudinal direction. is provided, and the belt detachment prevention plate includes a pressure contact plate that is vertically disposed downward from the prevention plate to press against the inner surface of the protective cover, and a pressure contact plate that flexibly extends to the side of the prevention plate and that is connected to the elongated hole. a locking protrusion that locks in a biased state with the locking groove of the belt; and a projecting piece that extends outwardly from each of the locking protrusions and projects on the outer surface of the protective cover, and includes a belt detachment prevention plate. A protective cover for a motor, characterized in that it can be selectively locked into a desired locking groove from outside the protective cover.