DE1205306B - Precision shift weight scale - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

JR Jt Jk GERMAN ÄW PATENT OFFICE

EDITORIAL

Int. α .:

Number:
File number:
Registration date:
Display day:

GOIg

German class: 42f-2

1205 306
C18245IXc / 42f
20th January 1959
November 18, 1965

The invention relates to a precision switch weight scale with a hanging on holders, lockable by locking devices and by lever after releasing the locking devices over Actuating devices controlled, can be placed on or removed from the balance beam Shift weight set and with a display device for the equilibrium position of the balance beam as well with one acting on the balance beam, roughly balancing the load to be measured, continuously load balancing force that can be changed via a control device and returns the balance beam to the zero position, through which the shift weights can be selected and after releasing the continuously changeable Counterforce from the balance beam can be applied by the actuating device.

Precision shift weight scales are already known, and one of these known scales is used several pens used for rough weighing that are difficult to adjust and in the adjusted areas are to be kept. Another disadvantage is the fact that spring tongues are provided which are similar how rider weights are operated. Even if the error range of a spring force is theoretically quite a bit can be precisely determined, there are, however, quite a number of sources of error with this known balance should be avoided.

There are also known combination balances, which practically consist of a pan balance and a spring balance exist with a hand lever to move the weighing process from one to the other To switch the scales. Furthermore, automatic lift cars are known in which a Liquid container raised against a plunger connected to the balance beam for so long until the balance arm reaches the equilibrium position, whereby the stroke of the liquid container is a Measure for the load results.

The invention is now based on the object of creating a precision switching weight scale that weighings can be carried out much faster than before without any loss of accuracy can.

This object has been achieved in a balance of the type indicated above in that according to the invention the control device for the continuously variable counterforce and the actuating device for the shift weights can be synchronized with one another by a synchronous motor. as It has proven advantageous here to use a spring as a continuously variable counterforce in a known manner to arrange.

Precision shift weight scale

Applicant:

Toshio Chyo, Kyoto (Japan)

Representative:

Dr.-Ing. H. Negendank, patent attorney,

Hamburg 36, Neuer Wall 41

Named as inventor:
Toshio Chyo, Kyoto (Japan)

Claimed priority:

Japan January 21, 1958 (1510)

But it is also possible and in many cases also advantageous with a precision switching weight scale to use a continuously changeable buoyancy device as a coarse weighing device, wherein then a float is arranged in a manner known per se as a continuously changeable counterforce whose Buoyancy can be changed by a lifting device for his float vessel.

The scales used in connection with the present invention are constructive in nature Structure already well known. The exemplary embodiments of the illustrated in the description Scales are therefore not the subject of the patent application.

The patent protection only comes in connection with the features characterized in the subclaims with the main claim as real subclaims.

The invention is explained on the basis of the drawings using exemplary embodiments. In the drawings represents
F i g. 1 is a front view of a scale according to the invention, partially in section,

F i g. 2 a side view of the device for increasing the continuously variable counterforce, as in the case of the scales according to FIG. 1 is used,

F i g. 3 shows a schematic arrangement of a differential transformer as part of a servo device,

F i g. 4 shows a circuit diagram for a compensating motor which is used as the drive for the in FIG. 2 illustrated Counterforce is used, the motor being automatically driven by the according to FIG. 3 built-up servo device controlled will,

509 738/107

3 4

5 shows a side view of the device for the circuit comprising the motor 23

Adding or removing counterweights provided switch 25, which is then closed,

is used in the balance shown in Fig. 1 when the balance beam is not in equilibrium.

6 shows a partially sectioned front view if another switch 26 is on the other side

another embodiment of a balance, 5 of the balance beam 2 is attached, a counter-

7 a device for increasing the applied control of the load can easily be achieved,

This switch can be operated by a servo device

Scale, partially cut, which will be replaced in the scale in the form of a differential transformer

according to FIG. 6 is used. the. In Fig. 3 and 4 is an automatic control

According to Fi g. 1 shows the center cutting edge 1 of the balance, which accommodates a differential transformer 27 with bar 2 from a bearing 3 at the upper end of an armature 28 for the motor 23 for driving the column 4. Two cutting edges 5 and 6 on gear 24 are used. Every change in equilibrium at both ends of the balance beam 2 is used for the balance beam 2 is determined by determining the hanging of a load tray 7 or to attack a change in the magnetic field of the transformer, the load continuously balancing counterforce 8. These three cutting edges 1, 5, 6 come simultaneously with when the armature 28 is moved into engagement 15 together with the suspension of their corresponding counter elements. The change in the magnetic field or are lifted from it when a locking linkage 9, which is amplified through the column 4 by an amplifier and passes through the motor, is displaced vertically in the transformer 27 as a detection signal. A cam 20 is fed to regulators29 (Fig. 4). A motor 10, which moves the locking linkage 9 vertically, is equipped with automatic control devices 29 and is conveniently referred to as a compensating motor on an actuating shaft 11 with a button 12,
provided attached, and on the shaft also any other servo device, in which the cam 13 is still provided, which engages a fixed principle of the nagative feedback reinforcement using adjusting pin 14. The upward movement of the fixed 25 can be effected by turning the cam 13 instead of the aforementioned automatic adjusting pin 14, the control device can be used.
that the load tray 7 attached to the suspension 15 The load on the tray 7 can be lifted from the number of. Revolutions of the gear 19 are determined,

The continuously compensating counterforce 8, which are proportional to the increased counterforce. This is made up of a helical spring 16, the upper end 30 of which, however, would not be as accurate as it is hung in a suspension plate 17.
the latter at the cutting edge 6 of the balance beam 2 an- The process described represents the first step takes effect. The lower end of the spring 16 is represented by one of the weighing processes, in which the load is connected by a tie rod 18 which carries a gear 19 on a thread section of the continuously variable counterforce 8. By turning the 35 is roughly weighed. This primary measuring process is gear 19, which is arranged between two plates 20, 21 only a preparatory stage for the secondary, ge on the device base plate 22, the precise measuring process Reading indicated the plates 20, 21, but this being the rotation of the. It is essential that the device roughly allow gear 19 adjusted. The vertical loading 40 holds the size of the counterweight so that the armed scales increased or decreased when the rod 18 moves in the same direction or, with single-armed scales exerted on the cutting edge 6 by the spring 16, can be removed.
Counterforce. With an automatic load balancing at

If any load is placed on the pan 7, a one-armed balance according to the embodiment

after the balance beam 2 is unlocked so that it is 45 play, the balance with a balance weight 90

can oscillate freely, each cutting edge 1, 5, and provided at one end of the balance beam 2,

6 on the bearing assigned to it, while at the other end there is a counterweight

the balance beam 2 inclines towards the shell side, the lifting device 38 and the weighing pan 7 inclines

and its equilibrium as a result of the weight on which are ordered. The counterweight lift-off device 38

Shell 7 loses. Then the spring is pushed through 50 and the weighing bowl 7 is at the cutting edge 5 on

upward movement of the rod 18 suspended by rotation of the balance beam 2.

Gear 19 pulled down, gradually As a device for adding or removing and continuously the counterweights exerted on the cutting edge 6 may be any known pre-force at the right end of the balance beam 2 can be used. In Fig. 1 are in themselves is increased until this is back in equilibrium. 55 known devices for adding or removing

The process of increasing the force at the far end of counterweights is illustrated as an example. Cutting edge 6 can either be done by hand or by a counterweights, as shown in FIG. 1 mechanical view Force by means of an electric motor borrowed, designed as ring weights 41, which from them be guided. According to FIG. 2 is the adjustment associated weight bars 42 with which the the spring caused by an electric motor 23, 60 shell suspension 15 is provided, are removable, which the gear 19 via a gear 24 to- Each ring weight 41 can be driven towards it. The motor 23 is then appropriately arranged hook 43, which with an actuation switched when the balance beam 2 is connected by its lever 44, are suspended. The support is released, and switched off as soon as actuating lever 44, which is movable about a joint 45 the balance beam 2 has regained its equilibrium 65, engages with a pin 47 on a cam 46, Has. so that a movement of the cam 46 to his

The automatic control of this process can cause shaft 48 that the operating lever 44 the

can be achieved in the simplest manner that in shift weight 41 removed from the rod 42 or it

5 6

on this again puts down. A shift weight 41, a lifted by the fact that the suspension 17, the Actuating lever 44 and a cam 46 form a counteracting the tension of the spring 16, high unit a shift weight feeder and withdrawn and hung on a hook 60 in order to pickup device. To bring several such units out of contact with the cutting edge 6. The various weights are arranged in a row - 5 and downward movement of the hook 60 to and indeed they each have a weight bar suspension 17 to put down on the cutting edge 6 or they

42, a joint 45 and a camshaft 48, as in lift off, is made by vertically moving a

F i g. 5 shown, so that various rods 61 to which the hook 60 is attached, by means of

weight combinations can be selected by causing a cam 62. The cam 62 is on the

the angle of rotation of the shaft 48, which is attached to several io same shaft 11 on which also the cams

Cam of different phases is provided, changed 10, 13 and 57 are arranged. These four cams

will. This camshaft 48 can move by an elec- tric 13, 10, 57 and 62 at a corresponding one

tromotor 50, as shown in FIG. 5 illustrates the rotated angular position of the shaft 11 associated with them

will. 51, 52 and 53, 54 are drive gears, rods 14, 9, 55, 61. The cams are on the

which drive the camshaft 48. 15 shaft 11 arranged so that when rotated around

The drive connection between the counterforce 8 30 ° cam 13 becomes effective, while after 60 ° and the counterweight lifting device 38, rotation of the cams 10, the balance is half-locked by a gear drive, not shown, between and after 90 ° rotation of the shaft 11 releases, wherein see the gear 19 and the camshaft 48 - the cams 57, 62 only after a 90 ° rotation posed. When an electric drive motor according to 20 of the shaft 11 become effective after the switching F i g. 2 and 5 is used, a synchronous motor is weight against the determined coarse compensation force switched on between the two motors 23 and 50. is exchanged. Then the scales can This means that the counterweights can be stored in the same way as conventional scales of what was initially carried out, to be used continuously.

Lent rough adjustment of the load can be carried out. Another embodiment of the invention is that the size of the in the case of FIG. 1 to ent- in the F i g. 6 and 7 shown. The in F i g. 6 ostracize Switching weight is the same as the previously roughly illustrated scale with a load tray and measured weight is. a counterweight storage device at the

In this interaction, the rotation should provide speaking ends of the balance beam 2, the camshafts 48 only cause the size 30 die cutting and 6 to be predetermined at the ends of the balance of the switching weights 41, which of the beam 2 support the shell 7 suspended thereon and the rods 42 must be removed, the one weighing frame 71 to accommodate the actual switching load by the switching weights 41 weights. In this type of scale, the weighing is carried out after or at the same time should be carried out by adding shift weights that are the same when the initially intended load is carried out by the 35 of the load. The counterweight tension of the spring 16 from the balance beam 2 away from the storage device according to FIG. 7 is essentially. The load on the load tray 7 can by the same as that of FIG. 1 with the exception that continuously variable counterforce only the switching weights are normally compensated by the weights if there are no bars 42 of the weighing frame 71 which are adjusted by means of the ring weights 41 in the meantime. Therefore 40 suspension 17 rests on the cutting edge 6, all actuating levers 44 are initially removed by means of a locking mechanism. Therefore, the cam 46 and the locking member are held so that they do not follow the cam 46, rod 55 on which the operating levers 44 engage when they are rotated. In Fig. 1 the festival is in a different way as in Fi g. 1 actuated,
actuator shown as a rod 55, soft with the to The suspension 72 on the cutting edge 5 carries a stop 56 arranged on it to the corresponding 45 metal float 73 . B. mercury or a right is moved when a cam 57 is rotated by the other, a high specific gravity actuating shaft 11. As described, liquid. The liquid is located in one of the scales explained after the ring vessel 75, which is weighted at a predetermined height according to the tension of the spring 16 50 is arranged. The load tray 7 hangs on an arm which is predetermined and which is pre-connected by the spring tension 16 on 76, which runs horizontally and removes the force exerted by the float balance beam 2.

If there is no load on the load tray 7, certain ring weights are 15 lifted off. When the balance beam is in the balance beam 2 is in a horizontal position free-swinging state, it is advantageous to keep the load balanced on both sides, 55 that this load exchange is carried out at the same time as the float 73 on the surface of the mercury. When the balance beam 2 floats in semi-locking silver 75 and at a predetermined state is located, d. H. if it only stops at a depth or immersion. When a load on the When the shell 7 is placed two millimeters around the central cutting edge, the balance beam tilts towards it may be what is considered a permissible limit for finding 60 this side, with the swimmer accordingly of equilibrium or non-equilibrium immerses this weight a little deeper. The same between the load on the shell 7 and the initially weight of the balance beam 2 is now thereby The rough adjustment made is sufficient, that can be regained on the left side of the scale release of the balance beam 2 from this state a counteracting force is exerted in beam 2, the completely free state also at the same time as the buoyancy of the swimmer 73 in the mercury the aforementioned exchange of loads carried out silver 74 is enlarged. The increase in awakening. In the case of the in FIG. 1 illustrated balance is driven by the in F i g. 7 shown fore Effect of the continuously variable direction of force.

The mercury vessel 75 sits on an arm 77 which is carried by a vertical shaft 78. The lower part of the shaft 78 is mounted in a bush 79 which is movable in the axial direction and can be connected to the shaft 78 by means of a spring-loaded pin 80. A ratchet-like one Recess 81 on the shaft 78 is used to receive the resilient pin 80. The socket 79 is in a Bevel gear 82 screwed in, which is supported by a frame 83, which is fastened to the base plate 22, is held in such a way that the bevel gear is secured against vertical movement, but can turn, when it is driven by the drive bevel gear 84 which sits on a shaft 85.

When the shaft 78 is locked to the bush 79 by means of the resilient pin 80 and the bevel gear 84 is driven in such a direction of rotation that the rotation of the with the drive bevel gear 84 in engagement standing bevel gear 82 causes an upward movement of the bush 79 with the shaft 78, wherein the mercury vessel 75 is lifted up on the arm 77 carried by the shaft 78, the buoyancy exerted on the float 73 in the mercury 74 gradually and continuously increases until the The increase in lift becomes equal to the load to be measured.

In the process described, the swimmer does not get large amounts out of his Equilibrium position can be moved. To determine the point in time when the buoyancy of the load the Holding the counterweight, it is beneficial to keep the permitted limit of its movement as narrow as possible. In in practice, the allowable movement of the float 73 is about one or more millimeters, preferably one to two millimeters, limited on his arm 76. According to FIGS. 6 and 7 is a stop 86 provided for the float arm 76, which limits the movement of the arm 76. In this way the balance beam 2 can be returned to a horizontal position, d. H. in the state of equilibrium, immediately after the arm 76 is raised when the increase in lift equals the weight the load in the shell 7 is. The time of equilibrium can therefore either be on arm 76 or on Balance beam 2 can be removed.

Then the load can be determined from the number of revolutions of the drive shaft 85 that are necessary so that the increase in lift forms a counterweight to the load, although the measurement result wouldn't be as accurate. However, this rough measuring process is very advantageous in that The size of the counterweight to be deposited can be determined quickly.

The counterweight storage can be carried out in the same way as in the case of the scale shown in FIG. 1 will. In this case, too, the movement of the bevel gear shaft 85 is in drive connection with it the movement of the camshafts 48, and it is also desirable that the actual displacement of the Counterweights are only effected when the initial determination of the coarse counterweight, namely the buoyancy that has been eliminated. The buoyancy is eliminated by loosening of the shaft 78 from the resilient pin 80. When energized, an electromagnet 88 pulls the resilient pin attached iron part 89 against the spring force, whereby the connection between the shaft 78 and the socket 79 is released. When the shaft 78 together with the float tank 78 through the resilient pin 80 is released, they fall down by their own weight until the arm 77 with the float vessel 75 strikes against a stop 87. In this way, the float bowl can return to its original position, see above that the increased buoyancy is removed instantly. It is also desirable that the electromagnet 88 is excited simultaneously with the release of the lock of the counterweight storage device as soon as the increase in lift forms an equilibrium with the load, the shift weight being instantaneous can be exchanged for the counterweight established at the beginning, namely the buoyancy.

After the shift weight has been exchanged for the buoyancy force, the exact weighing can be done the load is carried out, as is generally the case with scales.

In Fig. 6, a locking element 91 is provided for locking the weighing frame 71, wherein a Cam 92 is used to move the locking element when the shaft 11 is rotated. The invention can continue either on equal-armed scales with buoyancy relief or on single-armed scales with Spring tension loading can be applied.

Claims (3)

Patent claims: 1. Precision switch weight scale with one hanging on brackets with locking devices lockable and by lever after releasing the locking devices via actuating devices controlled shift weight set that can be placed on or removed from the balance beam and with a display device for the equilibrium position of the balance beam and with a acting on the balance beam, roughly balancing the load to be measured, continuously changeable via a control device, returning the balance beam to the zero position Load balancing force, through which the shift weights can be selected and after releasing the continuously changeable counterforce from the balance beam can be applied by the actuating device are, characterized in that the control device (19, 23,24) for the continuously variable counterforce (8) and the actuating device (44 to 54) for the Shift weights (4.41) can be synchronized with one another by a synchronous motor. 2. Precision weight balance according to spoke 1, characterized in that a spring (16) is arranged in a known manner as a continuously variable counterforce. 3. Precision shift weight balance according to claim 1, characterized in that a float (73) is arranged in a manner known per se as a continuously variable counterforce, the buoyancy of which can be changed by a lifting device (77 to 85) for its float vessel (75). Considered publications:
German Patent No. 277 506;
Austrian Patent Specification No. 84 054;
U.S. Patent Nos. 1,377,569, 2,680,012. 1 sheet of drawings 509 738/107 11.65 © Bundesdruckerei Berlin