JPH0131128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a loading platform that affects a spring of a weighing mechanism, the loading platform is movable with respect to a casing via the weighing mechanism, and the loading platform is arranged to be movable relative to the casing via the weighing mechanism. It has a plate-shaped conductive working member that is attached to the load receiving platform and arranged to face each other, and the working member forms a capacitance, and changes in the capacitance are digitally measured by a converter. It relates to a digital indicating scale having an oscillator for transmitting to an indicating device and said transducer generating a frequency which varies with said spacing of said active members.

In known scales of this type, the spring of the weighing mechanism is designed as a helical spring, and the support element is attached to the helical spring via a bearing support. An electrode plate is mounted as an active member on the insulating plate, and the distance between the electrode plate and another active member fixedly attached to the housing changes depending on the movement of the support member.
The arrangement of coil springs and working elements is complex, expensive to assemble and complicated to adjust due to tolerances (German Patent Publication no.
(See Publication No. 2807586).

The object on which the invention is based, on the other hand, is to make the spring-actuating element-mechanism simple and suitable for use, for example, in small scales, and with the individual parts configured as desired and simple and easy to assemble. The purpose is to provide a scale that can be adjusted.

According to the present invention, this problem can be solved by a system in which the spring is a leaf spring, a working member is provided between the leaf springs, and the leaf spring and the working member substantially constitute a weighing mechanism.
two supporting parts are spaced apart from each other to form opposite ends of the unit, and the supporting parts are connected to each other by leaf springs to form one end of the unit. The supporting part forming the forming part is attached to the frame of the casing and the supporting part forming the other end is connected to the loading platform, and the working member is connected to the leaf spring at the supporting part between the springs via the insulating part. This can be solved by connecting them in parallel. The unit constituting the weighing mechanism therefore has only a small number of parts which are easy to form and assemble and which can be precisely adjusted relative to each other from the front. Since the aforementioned unit can be made very compact, it can be mounted on small scales such as household scales, cooking scales, letter scales and the like. Furthermore, the actuating members move substantially parallel to each other under load and are actuated in the form of a parallelogram, so that there is no command strain.

In a very advantageous embodiment of the invention, the leaf spring is formed from two spring steel plates, the supporting part is formed as a C-shaped plate part, the legs of the plate part are connected to the leaf spring on the outside, and Connected to the insulating part on the inside. Such a method allows the device to be manufactured easily. Also, in order to facilitate quick and easy assembly, the bottom plate of one support part extends beyond the legs and the projections thus formed are inserted into grooves in the frame of the casing. For fixing, screws are used, which are inserted into slots with open edges in the mounting wall of the frame of the casing. The bottom of the casing, the loading platform, the leaf spring, and the conductive plate are arranged so as to be at least substantially parallel to each other in the rest position.

In order to compensate for the influence of stray volumes which may occur in the mechanical part of the scale and which are superimposed by the load to be weighed on the volume constituting the active member,
A correction capacitor is provided corresponding to the oscillator of the converter. Furthermore, since the oscillator has a variable resistance, the oscillation frequency can be externally controlled to indicate a predetermined magnitude using an indicating device, for example. A reset circuit can be used to remove the initial value of the oscillation frequency when no load is applied to the scale. Current consumption can be reduced by providing an automatic power supply circuit and cutting off the power supply circuit when the weighing process is completed after a predetermined time and the balance returns to an operating state in which no load is applied.

The invention will now be explained in detail with reference to the illustrated embodiments.

The figure shows a scale for cooking work, in which case the loading tray 1
is attached to a loading platform 2, which influences a weighing mechanism 4 provided within the casing 3. Mechanical deviations of the weighing mechanism 4 are detected electrically by a transducer 5 which feeds a digital indicating device 6.

The weighing mechanism 4 essentially consists of leaf springs 13, 14 and actuating members 8, 9, with a spacing 1 between the actuating members 8, 9.
0 is the standard for digitally indicated values. The leaf springs 13, 14 and the actuating members 8, 9 constitute one unit 11, one end of which is connected to the loading platform 2 and the other end is attached to the frame 12 of the casing. ing. The leaf springs 13, 14 are formed from rectangular spring steel plates having a central punching part 17. The leaf springs 13 and 14 are located at the narrower side edges of the support portions 20 and 21 of the C-shaped cross-section made of plate bodies.
It is fixedly connected to the outer surface of 16 or 18, 19, for example by rivets. Support part 21
An electrically conductive rectangular plate-shaped working member 8 is attached to the inner surface of the leg portion 18 of the support portion 20 with an insulating portion 22 in between, and an insulating portion 25 is attached to the inner surface of the leg portion 16 of the support portion 20. A plate-shaped working member 9 is connected in between. The bottom plate 23 of the support part 21 extends beyond the legs 18 , 19 and inserts the projections 28 , 29 formed thereby into the grooves 30 , 31 of the frame 12 of the casing and into the mounting wall 32 . It can be inserted along. Bottom plate 23
is fixed by screws 33 and 34 at the contact position,
In that case, the screws 33, 34 can be inserted into the slots 35, 36 of the mounting wall 32 and at the same time screws 33, 34 can be inserted into the angle plate 37.
can be attached to the mounting wall 32. An angled plate 3 is attached to the bottom plate 26 of the support part 20.
9 legs 38 are attached with screws, and the other leg 40 of the plate 39 is removably connected by a bayonet to a cover plate 41 on which the load pan 1 rests. Therefore cover plate 4
1 has a protrusion 42 that is inserted into an opening 43 of the plate 39. Edge 44 of cover plate 41
is curved downward and surrounds the casing edge 45, including the opening of the casing 3, at a distance. Plate 39 and cover plate 4
1, the leaf springs 13, 14 and the actuating members 8, 9 are arranged parallel to the bottom 46 of the housing in the rest position.

On the angle plate 37 there are provided parts of the transducer 5 separated by an insulator 47,
The transducer 5 is then mounted on the bottom 46 of the casing and combined with the indicating device 6 into one unit. Also, as can be seen in FIG.
is installed.

[Brief explanation of drawings]

Figure 1 shows a scale according to the present invention as shown in Figure 2.
FIG. 2 is a schematic cross-sectional view taken along a line, and FIG. 2 is a plan view with the load tray and load receiving stand of the scale according to the present invention removed. DESCRIPTION OF SYMBOLS 1... Load tray, 2... Load receiving stand, 3... Casing, 4... Weighing mechanism, 5... Converter, 6... Digital indicating device, 8, 9... Action member, 12...
Casing frame, 13, 14... leaf spring,
20, 21... Supporting part, 22, 25... Insulating part, 30, 31... Groove, 32... Mounting wall part, 3
3, 34... Screw, 35, 36... Slot, 4
5...Casing edge, 46...Casing bottom, 47...Insulator, 48...Battery.

Claims (1)

[Scope of Claims] 1. It has a loading platform that affects the spring of the weighing mechanism, the loading platform is provided so as to be movable with respect to the casing via the weighing mechanism, and the loading platform is connected to the casing and the loading platform. It has plate-shaped conductive working members attached to and arranged opposite to each other, the working members form a capacitance, and a change in the capacitance is transmitted to the digital indicating device by a converter. In the digital indicating scale, the transducer has an oscillator that generates a frequency that varies depending on the spacing between the working members, and the spring is composed of leaf springs 13 and 14, and the working member is placed between the leaf springs. 8, 9, and the plate springs 13, 14 and the operating members 8, 9 substantially constitute a weighing mechanism.
Further, two support parts 20, 21 are provided at a distance from each other to form both ends of the unit 11, and the support parts 20, 21 are held together by leaf springs 13, 14. The support part 21 which is connected and forms one end of said unit is attached to the frame 12 of the casing, and the support part 20 which forms the other end is connected to the receiving platform 2 and acts on the support parts 20, 21. A digital indicating scale characterized in that members 8 and 9 are connected between leaf springs 13 and 14 via insulating parts 22 and 25 so as to be parallel to the leaf springs. 2. An angular plate 39 is attached to the support part 20 by one leg 38, and on the other leg 40 of said plate there is a cover plate 4 on which the cargo tray 1 can be placed.
2. A scale according to claim 1, further comprising an opening 43 into which one protrusion 42 is inserted in the form of a bayonet. 3. The support parts 20, 21 are formed as C-shaped plate parts, and the leg parts 15, 1 of the plate part
6; 18, 19 are connected to the leaf springs 13, 14 on the outside, and connected to the insulating parts 22, 25 on the inside. 4 The bottom plate 23 of at least one support part 21 extends beyond the legs 18, 19 and connects the projections 28, 29 of said bottom plate to the frame 1 of the casing.
2. The scale according to claim 1, wherein the scale is inserted into the grooves 30 and 31 of No. 2. 5 Mounting wall portion 32 of casing frame 12
has slots 35, 36 with open edges;
Support part 2 forming one end of unit 11
1. A scale according to claim 1, wherein the scales are fixed by screws 33, 34 inserted into the slots 35, 36.