DE661229C - Libra - Google Patents

Description

scale

The invention relates to a scale in which the weight or the price of the goods regardless of the actual weighing mechanism in a display device, which over suitable intermediate links follow the scale deflection, set numerically and is printed. The known constructions of this type have the disadvantage that the safe Detection of the follower in the setting that exactly corresponds to the setting of the balance, especially if the back-up is supposed to work quickly, this is not guaranteed.

The balance according to the present invention avoids this disadvantage in that the speed of the follow-up device before reaching the setting of the scale corresponding setting is reduced. In this way it is achieved that the trailer covers a large part of its path at great speed and yet, thanks to the delay, at a point in time! in which he is the one of the balance setting reaches the appropriate setting, runs so slowly that it is accurate in this position can be brought to a standstill and determined. The speed should be so far be delayed so that the path covered by the trailer within the triggering time of the locking element of the display device, is smaller than the movement corresponding to the smallest display unit.

The invention is schematic in several embodiments on the drawings shown. To simplify the illustration, various gear parts are included in the Drawing plane shown rotated.

In the scale of FIG. 1, 1 denotes the Balance pointer, 2 the adjusting element known per se, which is independent of the balance pointer and is mounted in the geometrical axis of the latter. There is a reset weight on the adjuster 3 (or spring) attached. The display device is a circulation counter 4, which is connected to the shaft 5. 6 is an electric motor that drives the post-actuator via shaft 5 2 and the display device 4 drives.

Two small leaf spring contacts 7 and 8 are attached to the follower element 2, one of which is electromagnetic Actuate lock 9 for the display device 4, through which the circuit of the electric motor via a contact 10 6 is controlled. The contacts 7 and 8 are designed so that they the pointer 1 after can easily oscillate in both directions, where you can easily drag on this.

In the circuit of the lock 9 there is still a relay 11, which when triggered a Releases stamp 12 for stamping the set weight. The function of the relay 11 can also be carried out by the lock 9 at the same time. 27 and 28 are contacts, which are automatically opened when the balance and the adjuster are set to zero. 29 is a double contact that is used to reset the display device by hand

opened and automatically closed by the pin 30 in the zero position of the latter will.

With the damping device of the balance is a known Kontaktvorrichttifoj ^ 19 connected through which the circuit »; of the motor 6 · during the pendulum motioneii the balance is interrupted to prevent incorrect setting of the display device, '

A braking device is also combined with the damping, which according to FIG Invention '% u-b6 has an effect that the movement the display device 4 before the circuit via the pointer 1 and the contacts 7 and 8 the lock 9 is closed and this is moved into the locked position, already delayed will.

The braking device consists of two damping cylinders 20 and 21 which are connected to one another through openings 22. The piston 23 connected to the balance pointer 1 moves in the cylinder chamber 20 and the piston 24 connected to the adjusting member 2 moves in the cylinder chamber 21. In order to reduce the friction surface of the piston 23, it is provided with sharp-edged piston rings. The piston 23 is so long that it closes all openings 22 in the zero position of the balance. In the zero position of the balance pointer 1 and the adjusting member 2, the upper end faces of the two pistons lie in one plane. In order to be able to move the piston 24 back easily and not to exert a suction effect on the piston 23, a suction valve 25 is expediently installed in the piston 24 itself. The rod of the piston 24 is constructed in two parts, and the two parts are connected to one another by the elliptical spring 26. The mode of operation of the balance according to FIG. 1 is as follows: According to the drawing, the pointer 1 and the tracking device 2 are in the zero position, in which the entire electrical equipment of the balance is de-energized when the contacts 27 and 28 are open. When the balance pointer 1 moves in the direction of the arrow under the effect of the load placed on the balance, the contact 27 is closed; but at the same time the contacts at 7, 8 and 19 are interrupted. When the balance has now returned to the rest position, the following circuit is closed by contact 19: from the positive line via contact 27, line 31, contact 19, motor 6, contact 10, contact 29 to the negative line. The motor starts up and moves the display device 4 or the adjusting element 2 after the balance pointer that has been played in, with the piston 24 being moved downwards at the same time. However, since the piston of the balance pointer adjustment is, for example, even in the dotted! .Gezeichneten layer 23, by assignment of the piston 24, the damping means \ k ^ ß cylinder 21 through the openings 22 ver-Jifdrängt. When the lower end face of the piston 24 has reached the upper end face of the piston 23 when the adjusting member 2 continues to move, all openings 22 below the piston 24 are closed. However, since the adjusting member 2 or the piston 24 has to be moved further until the balance pointer is caught or until the surfaces of the two pistons coincide with regard to their position, the damping means must through the small clearance between piston and cylinder wall (or by special, under Pressure valves) are displaced, which results in a strong braking of the follow-up movement before the balance pointer is reached, but without influencing the balance pointer setting or the position of the piston 23. To trigger a further delay, the spring 26 could also be compressed and an electrical contact closed or opened. As a result of the braking, the circumferential speed of the display device 4 must be reduced so far that when the contacts J, 8 'are closed by the pointer 1 within the triggering time of the lock 9, the display device is moved by less than a whole display unit, whereby one of the balance settings corresponding setting of the display device is achieved.

The reduction in the peripheral speed of the display device 4 would also be in another way, for example by changing the gear ratio between motor 6 and display device 4 to reach. For this purpose an electromagnetic Gearbox installed between motor and shaft 5 and e.g. by contact closing at Compression of the spring 26 can be triggered.

By making contact at 7, 8 when the pointer 1 is reached, the following Circuits closed: From the positive line via contact 28, line 32, relay 11, relay 9, contact 29 ', contacts 7, 8 and pointer 1 to the negative line. This will the lock 9 moves into the locked position, the further movement of the display device 4 and the adjuster 2 locked and the circuit of the motor interrupted at 10. At the same time the relay 11 is triggered and the stamp 12 is released for stamping.

If the weight is now set, it is necessary that it is for the duration of the

The stamp also remains securely set. This is achieved in that when moving the Lock 9 in the locked position by a second circuit via contact 33 and double contact 29 is closed. As a result, the circuit of the locks 9 and 11 via the Contact 29 further closed and the connection. Keep pointing device set until it is interrupted by opening the double contact 29. When that happens, it will be through Lock 9, the display device 4 and the entire follow-up device released and returned to the zero position by the reset weight 3, in which the double contact 29 closed again by pin 30, contact 28 opened by pin 30 ″ and thereby the whole device is provided to new settings.

In Fig. 2, a further contact arrangement for reducing the speed of the display device is shown schematically. To simplify the illustration, the balance pointer 1 and the spiral 35 connected to it have been shown shifted to the left with respect to the trailing element. In reality, the two gear parts lie in the same geometrical axis a or a ', but completely independent of one another.

Here, too, 1 is the balance pointer, 2 the follower element, 3 a reset weight, S the Shaft of the display device and 6 the drive motor. With the balance pointer 1 is a spiral 35 firmly connected, which rotates with the movement of the pointer and is set according to the pointer deflection. Of course, a corresponding curve can also be attached to another part of the balance even if the part in question is moving in a straight line. Through the The gearwheel 36 is driven by the electric motor 6, which has an arm 37. This The arm is connected to the trailing wheel 2 by the spring 38. The spring 38 is tensioned by the weight 3 and thereby the trailer 2 is held at the stop 39 in its zero position. With the gear • wheel 36, the gear 39 'is firmly connected and meshes with the rack 40. On the other The end of this rack is a contact 41 for actuating one in the drawing Not illustrated braking device o. The like. Attached. By the spring 42 is A flexible connection is created between contact 41 and rack 40.

The operation of the device is as follows: By moving the pointer 1, the spiral 35 rotated with it and the load placed on the balance according to the contacts 41 set a smaller radius of the spiral opposite. When the scales are brought in has, the circuit of the motor 6, which starts up, is closed in a known manner and the wheels 36, 39 'and the rack 40 are moved in the direction of the arrow. Included is pulled by the spring 38, the adjusting member 2 and the seated on the shaft 5 Display device to zero until the arm 37 has reached the pin 431. Through this the contact 41 receives the adjusting member 2 and the display device opposite an advance so that it will reach the spiral 35 earlier than between pointer 1 and adjusting member 2, the contact is made. This lead becomes the necessary Time gained to brake the display device. As the wheel 36 continues to move, the arm 37 and pin 43 moves the adjuster 2 and the display device. If now the contact 41 has reached the spiral 35, is through this contact via a in the Drawing not illustrated device the speed of the follower device reduced, which then up to the blocking or making contact between pointer 1 and adjusting member 2 with decreasing Speed continues. As the rack 40 continues to move after contact has been established, between 35 and 41 becomes the tension of the small spring 42 according to a pressure on the contact 41 Spiral exercised. In order to avoid a movement of the pointer 1, the contact 41 is arranged so that this pressure acts in the radial direction on the axis of the pointer and no torque can arise as a result. If after finding the display device the circuit of the motor is interrupted by the lock 9, the shaft S and the adjusting element 2 held by the lock 9, on the other hand, by the reset weight 3, against the action of the spring 38, the gears 36, 39 'and the rack 40 moved back and the contact 41 is lifted from the spiral 35, so that when the load is removed from the balance, the pointer and the spiral can move freely.

In Fig. 3 is also a contact arrangement for actuating a brake o. The like. illustrated schematically. On the adjuster 2 there are two further contacts 7 'and S' attached, which extend towards the balance pointer ι out further than the contacts 7 and 8. The time gained by this advance could e.g. B. to trigger the already described transmission gear serve. To with further movement of the adjuster after making contact between ι and 7 ', 8' not to move the balance pointer, could get into the circuit of the electrical

motors 6 (Fig. ι) a small relay χ are switched on, which only locks the balance pointer so easily that the pointer cannot move through the small grinding resistance. In the scale shown in FIG. 4, the adjusting element and the display device are moved with the scale pointer, but with a certain delay. This later movement of the adjusting member from the rest position compared to the movement of the balance pointer results on the one hand from the time required to close the contact 10 and to start the motor 6; on the other hand, the magnetic lock 9 can be provided with a special delay.

In the scale according to FIG. 4, 1 is again the scale pointer, 2 the adjuster, 4 the Display device, 5 the shaft of the display device, 6 the drive motor, 7 and 8 two contacts for actuating the magnetic lock 9, 10 one contact for interruption of the motor circuit. There are two more leaf spring contacts on the adjuster 2 here 44 and 45, which protrude further from the pointer ϊ than contacts 7, 8, so that they only make contact with it when moving the pointer backwards. At the Adjustment member 2 is still the interrupter 46 is arranged, which is in the zero position of the adjusting element, the contact 47 opens. There are resistors in the motor circuit 48 and 49 attached. Each resistor consists of a number of partial resistances, uhd each partial resistor has a small leaf spring contact 50. The circuit of the resistances is done by one of the damping device of the balance in known Way influenced and designed as an electrical contact flap 51, depending on the movement of the balance pointer in plus or minus direction. 53 is an electromagnetic change gear whose Magnet is excited by making contact between 51 and 54 and the gear, according to the movement of the pointer, switches to the minus direction. The change in The direction of rotation of the display device could also be achieved by switching the motor circuit can be achieved. 55 is a clutch whose magnet 56 by closing the contact 57 is excited by the lock 9 for the purpose of decoupling. By decoupling the auxiliary contact 58 is closed, whereby the clutch also remains disengaged when contact is made through the lock 9 at 57 is interrupted; the clutch is only re-engaged when the circuit is at and 59 is interrupted. 60 is an electromagnetic . Stamp for printing the set weight. The display device 4. is reset to zero in a known manner by pulling out the button 61. The disks of the display device are for the interrupter pin 62 each with a 6g Notch 63 provided so that when all discs are in the zero position, the pin 62 falls into the notches and breaks contact at 59.

The mode of operation of the balance according to FIG. 4 is as follows: If the balance pointer ι deflects in the direction of the plus arrow under the effect of the load placed on the scales at the same time by the damping device of the balance the contact flap 51 also in Plus direction moves. Since the force exerted by the load at that moment is on is largest, the contact flap 51 is against the action of the springs 50 up to their get the largest rash and the resistance 49 over the abutting one another Short-circuit springs 50. With this movement of the balance pointer, on the other hand by breaking contact at 7, 8, the lock 9 is de-energized, under the action of a The spring moves into the release position and closes the circuit of the motor 6 at 10. Since the resistor 49 is switched off, the motor runs quickly, but at a certain rate Delay on and moves the adjusting member 2 and the display device 4 in the plus direction after the balance pointer. When the balance pointer goes beyond the deflection corresponding to the load, will decrease its speed to zero. Because as the speed of the By the pointer, the pressure on the flap 51 is also correspondingly lower, the springs 50 to press! the flap after its central position, the motor always gets the power through you too increasing resistance, so that it will also run slower. When commuting back of the pointer in the minus direction, the flap 51 is also in the minus direction moves, initially the contact 54 for the change gear 53 is closed and the The gearbox is switched to the negative direction, which means that the trailer 2 is also in Minus direction is moved. By further deflection of the flap 51 in the negative direction the resistor 48 is short-circuited as before the resistor 49. If after When the balance has finished swinging, the flap comes to a standstill in its middle position comes, it interrupts the circuit via the contacts 50. To the follower 2 to To move on to retrieve the pointer 1, the current is now via resistor 49 and line 52 is fed to the motor, so that the motor continues to run very slowly until the trailer has caught up with the pointer. By making contact between

I and 7, 8 the following circuit is closed: from the plus line via line 64, contacts 7, 8, lock 9 and line 65 back to the minus line. The lock 9 is energized and moved into the locked position, the motor is switched off at 10 and the contact is closed at 57. By closing this contact 57, a second circuit is closed: from the plus line via line 66, contact 47 or 59, magnet 56, contact 57 and line 65 to the minus line. Magnet 56 is energized, clutch 55 is decoupled and the contacts 58 are closed. The weight is set and can be printed any number of times by the electromagnetic stamp 60 by pressing the button 67 , with each stamping a circuit from the positive line via line 66, contact 47 or 59, magnet 60, contact 67, contacts 58 and line 68 is closed back to the negative line.

After decoupling the display device 4 from the setting device, the latter behaves with respect to the balance, in contrast to the balance according to FIG. 1, exactly as it did before the setting. When the load is removed from the balance, the pointer 1 and the flap 51 move in the negative direction and close the contacts 1, 44 and 51, 54, whereby on the one hand the lock 9 is short-circuited via 7, 1, 44 and on the other hand the circuit "iir the magnet of the change gear «57 is closed and the gear is switched to the negative direction. By short-circuiting the lock 9, the latter snaps back and closes the circuit of the electric motor at 10, which starts and moves the follower 2 back to the negative direction in the zero position, in the by releasing the contact i, 44, the lock 9 is re-energized, which interrupts the circuit at 10 and blocks the further movement of the shaft 5. After the end of the stamping, the display device 4 is automatically reset to zero in a known manner by pulling out the button 61, without it being able to be held in any other position besides the zero position; the pin 62 engages in the notches 63 and below breaks the contact at 59. In order to set the balance ready for weighing again, the coupling 55 must be coupled to the display device 4 again. This is done automatically by de-energizing the magnet 56 when the two contacts 47 and 59 are open, ie when both the scale and the display device are in the zero position.

Line 69, contact 45 are only necessary if predetermined by the balance Weights should be precisely balanced and the removal of a small one that exceeds the predetermined weight Excess weight of the load pan is required. As with small weight reductions the flap 51 executes only small movements in the negative direction, it can happen that it no longer closes the circuit between 52 and 54 and the gear 53 does not is switched to the minus direction. In this case, the current is then short-circuited of the transmission 53 via the line 69 and contact 45. Since this is a decoupling of the Display device may only take place after the weight reduction is in the line of the magnet 56 still switched on a manual switch - that only after manufacture of the correct weight is closed.

In addition to the exemplary embodiments described, there are of course numerous designs of the inventive idea possible, which differ in details.

Claims (11)

Claims: 8s 1. Scales with a follower element for the purpose of setting the weight indicator the deflection of the balance is tracked, the drive motor of which when the equilibrium position is reached The balance is switched off automatically, indicated by the speed of the trailing element (2) before its final setting to the respective Device reducing the balance position. 2. Scales according to claim 1, characterized in that the follow-up speed reducing device a display device (4) within one of the smallest display unit contains corresponding way retaining locking member (9). 3. Balance according to claim 1 and 2, characterized in that the reduction the follow-up speed as a function of the distance between the follower link (2) is controlled by the balance position. 4. Scales according to claim 1 and 2, characterized in that when tracking of the adjuster (2) in whole or in part during the break-in period Weighing in the direction and size of the speed of the follow-up movement depending on the direction and The size of the oscillations of the balance when importing is controlled via a damping device Organ influenced by the balance (51, Fig. 4) is provided. 5. balance according to claim 1 to 4, characterized in that the after- running speed 'reducing device designed as a braking device is (20 to 24, Fig. 1). 6. balance according to claim 1 to 4, characterized characterized in that the follow-up speed reducing device from a larger translation exists between the follower element (2) and its drive engaging gear. 7. Scales according to claim 1 to 4, characterized in that for reduction the overrun speed in the circuit of the drive motor (6) at times electrical resistors (48, 49) that can be switched on or off are provided. 8. balance according to claim 1 to 3 and 5 to 7, characterized in that for Reduction of the overrun speed depending on the distance of the Follower element (2) from the equilibrium position of the balance on the follower element (2) via the cut-off contacts (7, 8, 3) in the direction of the pointer deflection contacts (7 ', 8', Fig. 3) are provided are movable perpendicular to the deflection of the pointer (1) and after Make contact on this so that you can easily touch the pointer (1) let it commute. 9. A balance according to claim 1 to 3 and 5 to 8, characterized in that a locking device (x) is provided to protect against adjustment of the pointer (1) by the contacts (7, 8, Fig. 3) sliding on it after making contact that holds the pointer (1) in place when contact is made, but gives way when it hits larger bumps. 10. balance according to claim 1 to 3 and 5 to 7, characterized in that in order to reduce the follow-up speed as a function of the distance between the follow-up element and the equilibrium position, a curved contact disc (35) interacting with a counter-contact (41) designed to correspond to the load weights and moved around the pointer pivot point when the balance is loaded is provided by the drive device ( 6, 36) compared to the adjusting element (2) - experiences an advance by means of an activated empty section (37>43> Fig. 2). 11. Scales according to claim, characterized characterized in that a damping device is used as the braking device, which consists of two cylinders (20, 21) connected to one another by slots (22) and two Piston (23,24) consists of which one (23) with the load balancing device and the other (24) is connected to the follower member (2) in such a way that that by the one piston (23) following the other piston (24) the Slits (22) shortly before reaching the balance position through the trailing element overall closed and thereby the braking effect on the trailing link (2) is increased. 1 sheet of drawings