JPS5899Y2 - Weight adjustment device for weighing machines - Google Patents

Description

[Detailed description of the invention] The present invention supports a load receiving frame using a leaf spring or a hammer and a spring, and lowers the load receiving frame by an amount proportional to the weight of the heavy object to be weighed on the receiving frame. This invention relates to a scale adjustment device, that is, a span adjustment device for a weighing machine, in which a pointer is rotated in conjunction with the descent of a weighing machine.

In such a weighing machine, the amount of strain in a strained body such as a leaf spring is not constant, and it is impossible to make the amount of strain and the rotation angle of the pointer constant due to conditions such as temperature and assembly errors.

Therefore, it is necessary to adjust the eye width to a constant level after assembly, but the present invention allows this adjustment to be easily performed using a simple mechanism, and the details will be explained as follows.

In the figure, A is a hollow weighing machine body with a bottom and an open upper end, which is composed of a dish-shaped bottom part 1 and an upper part 2 fixed on the bottom part 1.

Reference numeral 3 denotes a support frame erected on the bottom 1, and the bases of a pair of upper and lower leaf springs 4, 5 are fixed to the upper part of the support frame 3.

A load receiving frame 6 is fixed to the outer ends of the upper and lower leaf springs 4.5, and a platform 7 for a heavy object to be weighed is fixed onto this frame 6.

Reference numeral 8 denotes an arm fixed to the support frame 3 between the leaf springs 4 and 5. A bent part of a tilted rocking body 9 is pivotally attached to the tip of the arm 8 by a horizontal shaft 10. A downward protrusion 11 at the tip of the movable body 9 faces the upper part of a receiving piece 12 fixed inside the receiving frame 6.

Further, the lower end portion 13 of the rocking body 9 loosely fits into the transparent window of the lower leaf spring 5 and protrudes downward.

The transparent window of the plate spring 5 is loosely fitted into the mounting portion 14 at the lower part of the iron arm 8, and the mounting frame 1 is fitted into the guide groove 15 at the lower end of the mounting portion 14.
The sliding portions 17 of No. 6 are slidably fitted together.

A vertical shaft 1 of a fan-shaped gear 18 is mounted on the upper and lower parts of the mounting frame 16.
A pinion gear 2 meshing with the upper and lower ends of 9 and the fan-shaped gear 18
0 and an integral pointer shaft 21 are rotatably attached to each other, and a pointer 22 is fixed to the shaft 21.

A protrusion 23 is provided on the back side of the guide groove 15 forming portion of the mounting portion 14.
A screw hole parallel to the guide groove 15 is formed in this protrusion 23, and an adjustment screw 24 is screwed into this screw hole.

Further, a contact piece 25 is integrally formed at one end of the mounting frame 16, and a corresponding piece 2 is provided between the contact piece 25 and the hooking portion of the mounting frame 16.
A spring 26 is tensioned to press the screw 5 against the tip of the screw 24.

Therefore, a long receiving part 27 is formed on the upper surface of the sector-shaped gear 13 in a direction substantially parallel to the sliding direction of the mounting frame 16, and this receiving part 27 is connected to the downward protrusion of the lower end part 13 of the rocking body 9. 11 side, and a spring 28 is stretched between the sector gear 18 and the mounting frame 16 to press the receiving part 27 to the lower end part 13.

The pointer 22 is bent as shown by the chain line in FIG.
A transparent window 30 for seeing through the main body A from the outside is provided at an appropriate location.

In FIG. 1, the pointer 22 indicated by a chain line indicates a state in which the pointer 22 located at the solid line position is swung to the right.

The present invention has the above structure, and the figure shows a load O, and at this time, the pointer 22 is in the position shown in FIG. 4, and this position is the 0 point.

When a heavy object is placed on the loading table 7, the upper and lower leaf springs 4 and 5 are bent downward due to the load, and the load receiving frame 6 is lowered.
The rocking body 9, which has the downward protrusion 11 in contact with the lowered receiving piece 12, rotates slightly downward about the shaft 10, and its lower end 13 rotates slightly rearward to move the sector gear 18 into the second position. Rotate slightly to the left as shown.

Therefore, the pinion gear 20 rotates clockwise to rotate the pointer 22, but since FIG. 2 is a bottom view, in FIG. instruct.

As described above, the vertical movement of the receiving frame 6 becomes a swinging motion of the swinging body 13, and this swinging motion is transmitted to the sector gear 18 through the contact between the lower end portion 13 and the receiving portion 27.

Therefore, when the screw 24 is turned to move the screw 24 forward or backward relative to the protrusion 23, the mounting frame 16, which presses the piece 25 onto the screw 24 by the spring 26, moves forward or backward along the guide groove 15.

Therefore, the contact point between the lower end portion 13 of the rocking body 9 and the receiving portion 27 and the shaft 1
The distance between 9 changes.

Therefore, the ratio of the rotation angle of the fan-shaped gear 18 to the amount of descent of the receiving frame 6 can be freely adjusted using the adjustment screw 24, and thereby the direction can be adjusted.

As described above, the present invention has a very simple structure in which the mounting frame 16 to which the pointer shaft 19 is attached, which has the fan-shaped gear 18 and the pinion gear 20 that meshes with the sector gear 18, is moved by the adjustment screw 24. The mounting frame 16 is movably mounted in the guide groove 15, and the mounting frame 16 is fixed at any position with a single adjustment screw 24, making it easy to adjust and small and lightweight. Therefore, it can be easily installed in the narrow space of a small weighing machine.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing an example of a weighing machine embodying the present invention, Fig. 2 is a bottom view of the main part of the same, Fig. 3 is a partially cutaway longitudinal sectional view of the main part, and Fig. 4 is 1 is a partially cutaway plan view of a weighing machine implementing the present invention. 3... Support frame, 4, 5... Leaf spring, 6
...Load receiving frame, 7...Place, 9...
... Rocking body, 11 ... Downward protrusion, 12 ...
...Socket piece, 13...Lower end, 14...
・Mounting part, 15...Guide groove, 16...
・Mounting frame, 17...Sliding part, 18...
Sector gear, 20...Pinion gear, 22...
... Pointer, 24 ... Adjustment screw, 25 ...
...Piece, 26...Spring, 27...Receiving part, 28...Spring.

Claims (1)

[Scope of utility model registration request] The lower end of the tilted rocking body, which swings about the horizontal axis as a fulcrum, is vertically moved in conjunction with a load receiving frame attached to a leaf spring or a hammer so that it descends by an amount proportional to the load of the heavy object to be weighed. In a weighing machine in which the fan-shaped gear is crimped onto the receiving part of a fan-shaped gear that rotates around a shaft, and the fan-shaped gear is meshed with a pinion gear fixed to a pointer shaft, a mounting frame on which the fan-shaped gear is pivoted and the pointer shaft is also attached is attached. It is movably attached to a guide groove in a direction substantially parallel to a straight line connecting the axis of the fan-shaped gear and the axis of the pointer, and is provided with one adjustment screw that allows the attachment frame to be fixed at any position.
A scale adjustment device for a weighing machine in which the receiving part on the fan-shaped gear is elongated in the moving direction of the mounting frame.