JPS5913110Y2 - Rope tensioning device for balance weight on a universal parallel ruler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rope tensioning device for a balance weight in a universal parallel ruler.

In the 1-to-easy type universal parallel ruler, a balance weight is connected via a rope to a cursor plate that movably guides the head and scale along a vertical rail to ensure smooth operation.

Therefore, if this rope becomes loose, smooth operation will not be achieved.

Therefore, when connecting the cursor plate and the balance weight, the present invention was developed for use with a balance weight in a flexible parallel ruler, which can securely fix the end of the rope without loosening, and also allows easy tensioning of the rope. It is intended to provide a rope tensioning device.

The present invention will be explained in detail with reference to the embodiments shown below.
In FIG. 1, 1 is a drawing board, 2 is a horizontal rail fixed along the upper edge of the drawing board 1, and 3 is a vertical rail whose upper end is guided by the horizontal rail 2.

As shown in FIG. 2, the frame portion of the vertical rail 3 that opens downward constitutes a rail surface 3a on the cursor board side, and when the horizontal rollers 5 of the cursor board 4 come into contact with these rail surfaces 3a, the cursor board 4 is movably guided along the lower surface of the vertical rail 3.

Further, the vertical rail 3 is provided with a hollow portion 3b for guiding the balance weight, and a traveling roller 7 of the balance weight 6 shown in FIG. 5 is movably engaged with the rail 3C.

The cursor plate 4 and the balance weight 6 are connected by two ropes 8.

A mounting bracket 9 having a ring portion is integrally fixed to the end of each rope 8, and is configured to be fixed to a predetermined position of the cursor plate 4 and balance weight 6 with a fixing screw 10.

In the above configuration, the rope 8 according to the tensioning device of the present invention
One end of the cursor plate 4 is fixed to the adjustment member 11 with a fixing screw 10 on the bottom surface of the cursor board 4, as shown in FIGS. 3 and 4.

In the case of the embodiment, the adjustment member 11 is movably fitted into a guide groove 12 formed in the cursor plate 4 in a direction bent in the longitudinal direction of the rope 8. The position of the fixed end of the rope 8 is adjustable.

11a is a long hole provided along the moving direction of the adjustment member 11, and the tightening screw 1 is inserted into the cursor plate 4 through the long hole 11a.
3 are screwed together.

In addition, a guide groove 12 facing the lower end of the fixing screw 10 screwed into the adjustment member 11 has an escape hole 1 for the fixing screw 10.
2 a is the provision.

Further, a protrusion 14 is provided at the rope introducing end of the guide groove 12, but there is no protrusion 14 so as to constitute a bent portion of the rope 8.

15 is a rope introduction groove.

Also, the other rope 8 fixed to the cursor plate 4 is also connected to the third rope.
As shown in the upper part of the figure, it is fixed in an introduction groove 16 having a rope bending part 16a.

In addition, 5a is a support shaft of the horizontal roller 5, and 5b is its fixing nut.

Further, in FIG. 1, 17a and 17b are rollers for guiding the rope 8 provided at the upper and lower ends of the vertical rail 3, 18 is a head portion, 19 is a scale, and 20 is a portion that connects the cursor plate 4 and the head portion 18. The connecting mechanism section 21 is a lower roller.

To explain how the device of the present invention having the above-mentioned configuration is used, the mounting bracket 9 at the end of each rope 8 is fixed to the balance weight 6 and the cursor plate 4 with the fixing screw 10.
With the tightening screw 13 loosened, move the adjustment member 11 into the guide groove 12.
After adjusting the tension state of each rope 8, the tensioning operation of the rope 8 is completed by tightening the tightening screw 13.

Furthermore, even if the rope 8 becomes loose due to long-term use, it can be easily adjusted by lifting the vertical rail 3 upward.

Furthermore, if the guide groove 12 is provided so as to be inclined in the longitudinal direction of the rope 8, it is possible to strongly resist the impact applied to the rope 8, and the tensioning operation can be facilitated.

As described above, according to the balance rope tensioning device according to the present invention, at least one end of the rope 8 is fixed to the adjustment member 11, and the rope is placed on the lower surface of the open cursor plate in the longitudinal direction of the rope. By fixing the adjustment member in a tilted direction so that its position can be adjusted, the rope can be easily and reliably stretched in a tensioned state, and the lower surface of the cursor plate can be adjusted in relation to the supporting shaft of the traveling roller. There are effects that can be used effectively, and there are great benefits in practical use.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the device of the present invention, Fig. 2 is a side view of the main part of the device partially cut away and partially omitted, and Fig. 3 is a cursor board showing the main part of the device. Bottom view, 4th
The figure is a longitudinal sectional view showing a part of the balance weight taken along the line IV--IV in FIG. 3, and FIG. 5 is a bottom view of the balance weight. 3... Vertical rail, 4... Cursor board,
5...Balance weight, 8...Rope, 9...Mounting bracket, 10...Fixing screw, 11...Adjustment member, 12... ...Guide groove, 13...Tightening screw.

Claims (1)

[Scope of utility model registration request] At least one end of a rope that connects the balance weight and a cursor plate that movably guides the head and scale along the rail surface that opens downward of the vertical rail is fixed to an adjustment member, and the adjustment member is A tensioning device for a rope for a balance weight in a universal parallel ruler, which is fixed to the lower surface of a downwardly open cursor plate in a direction inclined in the longitudinal direction of the rope so as to be adjustable in position.