DE1229005B - Device for stacking and re-separating rectangular, flat mail items - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B 65h

German class: 8Ie-147

Number: 1229 005

File number: T 24413 XI / 81 e

Filing date: August 2, 1963

Opening day: November 17, 1966

The invention relates to a device for stacking and re-separating rectangular ones flat items, such as letters, with an underfloor belt serving as a stacking support is provided, which when withdrawing mail in the direction of the separator is driven, and the drive of the stacking trolley by a arranged on the stacking trolley on the stack pressure responsive sensing element is controlled. ίο

With the forklifts used up to now, it was customary to use the Stacking trolley to provide two contacts that the forward and backward running of the stacking trolley accordingly control the filling level of the truck. These contacts respond to the pressure that the Pile trolley exercises on the pile. The first contact determines when the pressure of the stacking trolley on the The stack exceeds a specified limit when moving forward and switches the drive of the stacking trolley to the opposite direction of rotation so that the stacking trolley runs backwards. He does so long until the second contact detects that the pressure of the stacking carriage on the stack is a predetermined value Pressure falls below. This contact then switches the drive of the stacking trolley back on reverses the original direction of rotation so that the latter runs forward again. That kind of control the stacking trolley has the major disadvantage that the stacking trolley due to its inertia always something moved beyond the "correct" position and consequently with a sensitive attitude the contacts constantly move back and forth, that is, it starts to oscillate.

The object on which the invention is based now consisted in taking appropriate measures to avoid this commuting. It is proposed according to the invention that the sensing element only for Control of the reverse movement of the stacking trolley is used and only to the exceeding of a predetermined one Responds to the value of the stack pressure and that control and drive means are provided which cause the carriage to run forwards when the sensing element does not respond and at the same time that Underfloor belt is driven.

An embodiment, which takes the inventive idea into account in an advantageous manner, is that the drive motor for the stacking trolley has such a direction of rotation and interacts with the endless traction means and the stacking trolley that the latter, when the sensing element exceeds the predetermined value of the Stacking device for stacking and re-separating
of rectangular, flat items

Applicant:
Telefunken

Patentverwertungsgesellschaft mb H.,
Ulm / Danube, Elisabethenstr. 3

Named as inventor:
Dr. Gisbert Burkhardt,
Karl Rehm, Constance

carriage notices, only moved away in the direction of the separator.

Said traction means is advantageously designed as an endless chain.

Furthermore, it has proven to be useful to place the drive motor for the stacking trolley on the stacking trolley to fasten and it by means of a chain wheel arranged on its drive axle to let the chain cooperate in such a way that the stacking trolley when the drive motor is switched on maintains its original superimposed velocity component in the opposite direction.

Another possible embodiment of the invention is that a fixed differential gear is provided, on one input shaft of which the drive motor for the underfloor belt, the drive motor for the stacking trolley is coupled to the other input shaft, and that the Differential gear drives the chain attached to the stacking trolley through its output shaft.

Another possibility of a design of the device according to the invention is that in a manner known per se, the drive motor for the stacking trolley optionally in both directions of rotation can run and by means of a traction means the stacking trolley both in the direction of and in the direction can move away from the separator and that the electrical switching means for the drive motor are designed for the stacking trolley that this drive motor for the stacking trolley in the Only then is the direction of rotation that causes the latter to move in the direction of the separator is switched on when the drive motor for the underfloor belt is switched on at the same time.

Exemplary embodiments of the invention are shown on the basis of the drawing. It shows

1 shows a first embodiment in plan view,

609 727/292

i 229 005
3 '4

F i g. 2 establishes a side view of the device in a stack print on the separating belt. Of the

Section along the line ΙΙ-Π, the stacking trolley 17 is now with the motor at a standstill

3 shows a second exemplary embodiment in plan view, also constantly in the direction of the isolated view, ■ lung ligament moves. Now the stacking takes place

F i g. 4 schematically shows a third exemplary embodiment. 5 new shipments faster than the separation, so

The underfloor belt is designated by 1, on which the stack grows. The feeler lever 24 provides a feed not shown stack is resting. This underfloor would take the pressure of the stack on the stacking trolley The tape runs over the pulleys 2 and 3 in FIG. 17 and switches the motor 20 on. The latter recorded Direction of arrow. On the base plates 4, the car now divides due to the rolling of its and 5 bearing blocks 6 and 7 are attached, on which io sprocket 21 on the chain 14 a relative operation Deflection rollers 2 and 3 are mounted. At the movement against the running direction of the underfloor line The end of the axis of the pulley 2 is a band, so that the stacking trolley runs backwards and Chain wheel 8 attached, the chain 9 and the stack pressure despite the arrival of new items second sprocket 10 of the first motor 11 sinks. If the stack pressure falls below a certain level If the underfloor belt 1 is in motion 15 th predetermined value, the sensing lever 24 switches puts. At the other end of the axis of the pulley 2, via the microswitch 25, is the motor 20 of the stack also attached a sprocket 12, but the dare again, so that this is under the has such a pitch circle diameter that the train driven by the underfloor belt motor Chain 14 receives a greater speed than chain 14 again in the direction of the separating belt Underfloor belt 1. On the axis of the deflection roller 3 20 begins to move.

is another empty to deflect the chain 14. In the event that it is only to be stacked, the running sprocket 13 is arranged. Due to the separation belt, however, the lower sprocket 12 is also driven, the chain is driven so that the floor belt 1 is at rest. The stacking trolley runs accordingly moved in the direction of the arrow. In addition to the underfloor of the arrival of new mail items to be stacked belt 1, parallel to this are two guide rails 15 and 16, more or less continuously backwards, more or less continuously backwards, due to the control by the microswitch 25 due to the control by the microswitch 25,
arranged on which the stacking carriage 17 by means of Finally, let us assume that its rollers 18 can be moved. On the side only sporadically, but no new stacking of the guide rail 15 takes place, the delivery of the mail items takes place. In this case, the stacking mails in the direction of the arrow through 30 dare under the train of the chain the stack after the slot 19. The conveyor belts that are used for transport and increased speed due to its higher speed and for guiding the mail at this slot compared to the underfloor belt the pressure on 19 are used, and the associated conveyor rollers are the stack until the feeler lever 24 is omitted for the sake of clarity. On the switch 25, the motor 20 turns on. This drives the stacking trolley, a second motor 20 is attached to 35 the stacking trolley briefly in the opposite direction, so the axis of which interacts with the chain 14 so that the latter is arranged relative to the underfloor belt back of the chain wheel 21. The stack remains on the stack until the pressure of the stacking trolley on the trolley 17 continues to be a stacking roller 22 stored stack has decreased.

as well as a feeler lever pivotable about an axis 23 It can thus be seen that as a result of the

24. This feeler lever, which has a contact, e.g. B. a 40 way of the device according to the invention the control

Actuated microswitch 25, responds to pressure and tion of the movement of the stacker cart both at

switches on the motor 20 when the pressure of the two cases standstill of the separator or

Stack on the stacking trolley and thus to the standstill of the stacking as well as with every possible

Feeler lever 24 exceeds a predetermined value, borrowed state of motion of the device between

and it switches the motor off again when the 45 finely dosed these extremes for each of these phases.

Press falls below a specified value. is cash.

At the end of the underfloor belt 1 is on the In F i g. 3, which shows a further embodiment, stacking trolley 17 on the opposite side of the stack are all components that have already been set up with a separating belt26 which, if those according to FIGS 50 denotes the reference number used in these figures of one of the deflection rollers 27, 28 in the direction of the arrow. The difference is being driven by the establishment. The separating belt 26 is designed as FIG. 3 compared to the already described group of holes belt and acts with one in that the motor 20 'no longer cooperates on the moving suction chamber 29. Between this loaned stacking trolley, but rather 'is fixedly arranged and singling belt and the stack is finally 55 that a differential gear 32 is provided, arranged on a sensing lever 30, which switches the first motor 11' with a micro of an input shaft 33 31 cooperates and determines when the second Mo pressure of the stack is coupled to its other input shaft 34 in the direction of the separating gate 20 '. The output shaft of the diffeband 26 exceeds a predetermined value. The differential gear drives with the microswitch 31 attached to it then switches off the drive of the chain edge 35, the chain 14, which is connected to the underfloor belt 1, the motor 11, via the chain wheel. 36 is running. This is no longer on the wave of the

The mode of operation of the described execution deflection roller 3 of the underfloor belt is arranged, but

The form is now as follows: it is stored independently. The direction of rotation of the

It is assumed as a normal case that in the truck both motors 11 'and 20' are such that on

A number of mail items have already been stacked on the two input shafts of the differential gear

and that the separating belt is constantly running. Also set different directions of rotation. If the

the underfloor belt runs continuously in this case, since motor 20 'is switched off, the stacking trolley receives

the sensing lever 30 does not increase too much of the differential gear 32 caused by the mo-

i 229 005

Tor 11 'given speed, which is slightly greater than that of the underfloor belt due to a translation. On the other hand, when the motor 20 'is switched on, the drive speeds are superimposed of the two motors, so that the stacking trolley determines the difference - including the sign - of the two speeds and thus lags behind the movement of the underfloor belt or even runs in the opposite direction.

With this device, the movement behavior of the stacking trolley is correct due to that in the forklift given conditions with that of the stacking trolley in the device according to FIGS. 1 and 2, Here the stacking trolley is not driven directly by a motor attached to it, but rather it is the speed and / or the direction of travel of the drive chain 14 of the stacking trolley the differential gear 32 changed.

In the exemplary embodiments described in FIGS it is advantageous to design both motors as brake motors.

In addition to these two mechanical embodiments, the invention can also be through an electrical Control of the two motors according to FIG. 4 can be realized.

In the device of FIG. 4, the mechanical Structure similar to that of the device according to FIG. 3. Instead of a motor 20 ', which has only one Has direction of rotation and works on a differential gear 32, here is also a fixed one Motor 20 "is present, but can run in both directions of rotation and directly the sprocket 35 drives which - as in FIG. 3 - in connection with the stacking trolley 17 via the chain 14 stands. The motor 11 ″ only drives the underfloor belt 1 via the sprocket 10 and acts with the drive for the stacking trolley in contrast to the designs according to FIGS. 1 and 3 mechanically not together.

The motor 20 ″ is connected ^{to the mains via the contactors 51, S 1} II, which can switch the phase, whereas the motor 11 ″ is connected to the mains via a simple contactor 5III. In the excitation circuit of the relay RsI is the switch 31 ″, which switches on the underfloor belt in FIGS . 1 and 3, and the switch 37, which is only actuated when the separating belt is to run 24 is actuated (Fig. 1 and 3), is shown in Fig. 4 as a working contact, which energizes the relay Rs 2 when actuated, that is, when the pressure of the stack on the stacking trolley is too high.

The contactors 51 and 511 switch on the motor 20 "and switch its direction of rotation. In the excitation circuit of 51 is the normally open contact rs2 II, the normally closed contact II and the parallel connection of the normally open contacts sill and rs III. The contactor 5III switches on the motor 11" . In the excitation circuit of the contactor 511, the normally open contact rs 21 and the normally closed contact si.

With the described position of the switches and relay contacts, the circuit works as follows: The switch 31 "is already in the" Underfloor belt running "position. However, the underfloor belt should only start to run when the separating belt is switched on Switch 37 happened, the relay RsI is energized. This relay energizes the contactor 5 III by closing its contact rs II. It energizes the contactor 51 at the same time by closing its contact rs III "simultaneously switched on and the contact si opened. The stacking carriage runs in the direction of the separating belt. The contactor 5III also closes its contact sill, which is parallel to the contact rs III. However, this contact sill has for

ίο the switch-on process is irrelevant.

When the sensing lever on the stacking trolley detects that the pressure of the stack on the stacking trolley exceeds a specified value, it closes switch 25 ". The relay Rs 2 is now energized. It closes its contact rs 2 1 and opens its contact rs 2 II. The contactor 51 drops out and the contact s I is closed, on the other hand the contactor 511 is energized. The switch 51 is switched over and thus the direction of rotation of the stacking trolley motor 20 ″ is reversed.

ao The stacking trolley then runs backwards in the manner already described. The contactor 511 also opens his contactsII.

If, during any phase of movement of the stacking trolley, for example while moving forward, the pressure of the stack on the feeler lever on the separating belt exceeds a predetermined value, then switch 31 ″ is opened and the relay RsI drops out. The latter also happens when the separating belt, for example The relay RsI opens its two contacts rs II and rs III. However, the motor of the stacking trolley is not stopped yet, but only when the contactor 5III, which is no longer energized after the contact rs II is closed, has dropped out and has opened his contact sill.

However, if the stacking trolley is moving backwards when the relay RsI drops due to the opening of one of the switches in its excitation circuit, the movement of the stacking trolley is not disturbed by this. By connecting the contacts s III and rs III in parallel, it is achieved that the stacking trolley motor 20 "is switched on at the same time as the underfloor belt motor 11" and it is not first necessary to wait for the contactor 5III to be energized. On the other hand, when the two motors are switched off, the result is that the motor 20 "is only switched off after the contactor 5III has also dropped out; the motor 20" is therefore switched off later than the motor 11 " which reaches its operating speed more slowly than the underfloor belt, even under unfavorable operating conditions, for example when the motors are switched on and off very frequently, always runs ahead of the underfloor belt.

The auxiliary contacts si and sll in the excitation circuits the contactors 51 and 511 are provided to protect the motor 20 ″. This is because it cannot prevent the contacts of the contactors 51 / 5II, especially after a large number of switching operations, after a switchover. In in such a case, the next time the motor 20 ″ is switched to the opposite direction of rotation the second contactor is operated although the first is still switched on. Through the two KontaktesI and sll avoid this because the auxiliary contact in the excitation circuit of one contactor is always opened when the other contactor

is excited. This auxiliary contact remains open as long as until the contacts of the energized contactor are opened again.

Claims (2)

Patent claims: 1. Device for stacking and re-separating rectangular flat mail items, such as letters, with an underfloor belt serving as a stacking support being provided, which is driven in the direction of the separating device when items are withdrawn. Drive of the stacking trolley is controlled by a sensing element arranged on the stacking trolley and responding to the stacking pressure, characterized in that the sensing element (24) only serves to control the reverse movement of the stacking trolley (17) and only responds to the exceeding of a predetermined value of the stacking pressure and that control and drive means (25, 20, 14, 11; 25, 20 ', 32, 14, 11; 25 ", .Bsi, Rs 2, Sl, SIl, 20", 14) are provided, which the forward run of the stacking trolley if the sensing element does not respond and the underfloor belt (1) is driven at the same time. as. 2. Device according to claim 2, characterized in that, in a manner known per se, the drive motor (20 ") for the stacking trolley can optionally run in both directions of rotation and, by means of a traction device (14), the stacking trolley (17) in both directions as well as in the direction of the separator (26, 29) can move away and that the electrical switching center] (RsI, Rs 2, Sl, SU) are designed for this drive motor so that it can move in the direction of rotation that a movement of the stacking trolley in In the direction of the separator, it is only switched on when the drive motor (11 ″) for the underfloor belt (1) is switched on at the same time (FIG. 4). 3. Device according to claim 1, characterized in that the drive motor (20, 20 ') for the stacking carriage (17) has such a direction of rotation and such with the endless traction means (14) and the stacking carriage cooperates that the latter, when the sensing element (24) determines that the predetermined value of the stack pressure has been exceeded, only in the direction of the Occasional moved away. 4. Device according to claim 3, characterized in that the drive motor (11, 11 ') for the underfloor belt (1) via an endless traction device running parallel to the underfloor belt (14) also the movement of the stacking trolley (17) in the direction of the separator (26, 29) causes, while the drive motor (20, 20 ') for the stacking trolley in such a way with the traction means and the stacking carriage (17) cooperates that during the duty cycle of this motor Stacking carriage receives one of the aforementioned opposite speed component, which can be greater in its absolute amount than the first component. 5. Device according to claim 4, characterized in that the endless traction means (14) is a chain. 6. Device according to one of claims 4 and 5, characterized in that the drive motor (20) is attached to the stacking carriage (17) and by means of one on its drive axle arranged chain wheel (21) interacts with the chain (14) for the stacking trolley (Fig. 1 and 2). 7. Device according to claim 6, characterized in that the on the stacking carriage (17) arranged drive motor (20) only a certain and constant speed of rotation can accept. 8. Device according to claims 4 and 5, characterized in that a fixed Differential gear (32) is provided, on one input shaft of which the drive motor (11 ') for the underfloor belt (1), on whose other input shaft the drive motor (20') for the Stacking carriage (17) is coupled, and that the differential gear through its output shaft the on the stacking carriage (17) attached chain (14) drives (Fig. 3). 9. Device according to one of claims 1 to 8, characterized in that the on the Stacking carriage (17) located and responsive to the stack pressure sensing element (24) the drive motor (20, 20 ', 20 ") switches on for the stacking trolley when a predetermined pressure is exceeded and switches it off when the pressure falls below a specified level. 10. Device according to one of claims 1 to 9, characterized in that the separator (26, 29) a second sensor element (30), known per se, which responds to the stack pressure it is provided that when the stack pressure on the singling device rises above a certain level Value stops the drive motor (11, 11 ', 11 ") for the underfloor belt (1). 11. Device according to one of claims 1 to 10, characterized in that the through the drive motor (11, 11 ', 11 ") for the underfloor belt (1) actuated drive elements of the underfloor belt and the traction means (14) are dimensioned so that the traction means runs a little faster than the underfloor belt. 12. Device according to one of claims 1 to 11, characterized in that the drive motors (11, 11 ', 11 "or 20, 20', 20") for the underfloor belt (1) or the stacking trolley (17) are brake motors. Considered publications:
German patent specifications No. 1101290, 1109 092, 983. 1 sheet of drawings 609 727/292 11, 66 © Bundesdruckerei Berlin