DE1763481A1 - Control device for a machine for folding a flat workpiece - Google Patents

Description

Dr. ing, E. BERKENFELD ■ Dipl.-Ing. H. BERKENFELD, patent attorneys, Cologne Attachment file number

for entry from June 5 , 1 968 Sch // Name d. Note THOMAS BROADBENT & SONS LTD.

Control device for a machine for splitting a flat

Workpiece.

The invention relates to the measuring and splitting of flat workpieces.

A control device for a machine for splitting an ilachin Workpiece is characterized according to the invention by a first Detector and transmitter unit, which displays and measures a dimension of a moving workpiece and a signal, its value for this Dimension is representative of a first information store transmits, which picks up this signal, through a device to the Transferring at least part of the signal in the first information memory from the first memory to a second information memory and by a second transmitter which transmits a further and cumulative signal, which is representative of the passage of the workpiece at a fold, to the second information memory, this causing a folding process when the required length of the workpiece has passed the fold.

According to a preferred feature of the invention, each is the first and second information memory an electronic circuit and contains at least one storage capacitor, the or each Storage capacitor with its associated transmitter through a resistor

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stood connected, so that the arrangement in this way a resistor-capacitor circuit forms. 1763481

The device for transmitting at least one TedL of the first in first information memory stored signal on the second information memory contains a switch which, in the closed position, switches the two storage tanks in parallel, with or without the addition of others Circuit elements that regulate the ratio of this storage.

According to a further embodiment of the invention, a third Information memory can be provided together with a device for dividing and transmitting the information stored in the first information memory Remaining signal after the original information has been transferred to the second information memory, so that through a third memory a further folding of the workpiece can be effected.

According to another embodiment of the invention for carrying out further Folding processes, a third information memory can be provided together with a device for dividing the information on the first Original information transferred between information stores the second and the third information memory, so that the third memory can effect a further folding process.

The following is an exemplary embodiment of the invention described with reference to the drawings in which shows:

FIG. 1 is a schematic diagram of the control device according to FIG Invention,

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■ A

Pig, 2 a preferred input circuit, which is used for the pre * direction can be used, 1763481

3 shows the resistor-capacitor circuit according to the invention,

4 shows a preferred output circuit that can be used for the device,

Fig. 5 schematically shows a charging curve for the direct current charging of the Capacitor Cl of FIG. 5,

6 schematically shows a charging curve for the direct current charging of the capacitor C2 of Fig. 3,

7 is a schematic diagram of the folding process,

8 shows a schematic of charging curves for both direct current charging as well as for the pulsating charge of a capacitor,

Fig. 9 shows a resistor-capacitor circuit for the multiple

i folding a workpiece. ^

In Fig. 1, a conveyor is shown which consists of movable Belts or bands 10 and 12, which are located in the through move the direction indicated by the arrows. A first transmitter 1J, the forms part of a detector and transmitter unit 14 is above of the conveyor 10 arranged. The detector (not shown) is arranged to be actuated by a moving workpiece 16 * which is carried by the upper run of the endless conveyor.

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which is formed by the belt or band 10.

The transmitter 12 is provided with a gear that passes by a workpiece 16 is set in.Drehung underneath the same. The teeth of this gear are arranged so that they emit a beam of light alternately interrupt and restore that hits a photoelectric cell I5. The output of the detector has the waveform of a sawtooth voltage IT * which is then a first Pulse formation circuit 11 is supplied.

One embodiment of the pulse forming circuit 11 that uses is shown in Fig. 2 and includes a Schmitt trigger semiconductor circuit (shown on the left side of the figure), followed by a monostable semiconductor multivibrator (shown on the right side of the figure), the one with a resistor-capacitor delay circuit is provided, which sets a constant pulse width.

The waveform of the output signal of the pulse generating circuit 11 consists of a train of pulses 19 of constant width and constant height, which are applied at a speed proportional to the speed of the flat workpiece 16 when it drives the gear of the unit 14. This pulse train (which is shown schematically in Fig. 1 at the exit from the circuit 11) is fed to the left side of the resistor-capacitor circuit R1 - C1 of the RC circuit 21 of Fig. J5 during the period in which the detector of the unit 14 is actuated will. This detector, which can have the form of a test switch, is arranged so that the actuation of the same opens the contact 18 (Fig. J>),

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, 5

'* ^! so that the capacitor C1 of the circuit of Fig. 'J3'cRiron ^ dlese pulse train can be charged, as Fig. 5 shows. The charge absorbed by the capacitor C1 is therefore proportional to the total length of the workpiece 16, because the contact 18 is open during the entire period in which the workpiece passes beneath the detector of the unit 14. ■

When the workpiece 16 has passed the unit 14 completely is, the detector associated with the unit scans this fact and opens the contact 20, while at the same time the contact 22 (Fig. 5) is closed immediately. A capacitor 02 that is connected in parallel to C1, therefore takes on part of the charge of the capacitor C1.

Then the contact 18 closes, whereby the capacitor 01 is discharged, so that the circuit R1 - 01 is now ready to pass to be charged with each subsequent workpiece that extends along the Conveyor 10 moves. The capacitor 02 retains at least a part the original charge on the capacitor, C1.

A second transmitter 24 (Fig. 1), which is similar to transmitter 13, is connected by a rotatable shaft 26 to pulley 28 over which the endless conveyor formed by the belt or belt 10 runs. The shaft 26 therefore rotates at a speed which is proportional to the speed of the workpiece 16 at any particular point in time. After the workpiece 16 has passed below the unit 14, the output voltage of the transmitter is cumulatively fed to the capacitor 02 through the resistor R2 of the RC circuit 21 via a second pulse formation circuit JQ,

10 9 816/0885 originally inspected

which can be essentially the same as circuit 11 (Pig. 1).

The charge taken from the second transmitter 24 by the capacitor C2 is therefore added to the charge stored in capacitor C2 during the previous charge transfer from capacitor C1 has been. Once the capacitor C2 has been charged to a predetermined ignition voltage Vp (Fig. 6), the output circuit becomes the pig. 4 conductive in order to generate an output signal which causes the actuation of the splitter, which is shown schematically by the Fold 32 is indicated. At the same time, the contact closes 20 to completely discharge the capacitor C2 and thereby the same to prepare for the following operation, in which the capacitor C2 takes another charge from the capacitor C1, which is charged by the passage of the following workpiece below the unit 14.

A preferred embodiment of the output circuit that uses is shown in FIG. This circuit includes a transistor 23 coated on one side with a low Leakage conductance that is used to deliver an output pulse at the ignition voltage Vp. The transistor is followed by a thyristor 25, which of the machine for splitting the workpiece the required output granted.

The device enables the workpiece to be folded into any desired ratio, regardless of the length of the ^1st

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ι / ooto '' the workpiece fed to the device.

1763Λ8 ι

With reference to FIGS. 5, 6, 7 and 8, FIG Drawings describing the theoretical basis of the invention.

The charging curve of the capacitor G1 is shown in FIG. T1 is the time constant of the first information memory RIrCI, S1 is the The speed of the workpiece at the first detector 14 and E1 is the Directional voltage of C1.

The charging curve of the capacitor C2 is shown in FIG. E2 is the rectified voltage of the capacitor C2 and Vp is that predetermined Voltage at which the capacitor C2 enters the output circuit of the Fig. 4 is discharged. T2 is the time constant of the second information memory R2-C2 and S2 is the speed of the workpiece at second transmitter 24,

According to FIG. 7, χ is that of the workpiece after measuring, but before

Wrinkles covered way. Then is ™

D + y = L + χ 0)

where D is the distance between the unit 14 and the fold 52 and L is the total length of the workpiece.

For folding it in half is

I = y (2)

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<(π η η λ η ' I.

176348 "

Equations (1) and (2) give

If ti is the time it takes the workpiece to get to the first transmitter to pass and t2 is the time it takes for the workpiece to cover the distance χ then is

^t1 "§1 (4)

and

^{t2 =} S2. (5)

It can be shown that for the capacitor C1 the charging voltage

V = E1 (1 - e

-t / T1

From equation (4), -L

V - E1 (1 - e ¹ ^) «~ (6)

For the capacitor C2 is therefore

E2 - nV - ■ _r t2 X E2 - Vp ^c > ^T2 e S2T2 What results » V = η L where η - - (E2 - Vp) e C1 C1 + C2

(7)

In equating equations (6) and (7),

V - E1 (1-e ^S1T1 ) = J / l2 - (E2 -Vp) e ^S2T2

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α '176348

what results

χ = S2T2 log e / * ^{E1 e} ^ - ^{η m + Ε2} Ί

L Ε2 - Vp J (8)

and χ - D - ■% from equation (3).

Equations (5) and (8) give

-L

D = S2T2 log e ß ^{B1 e} ^ "< ^{n E1} - ^E2 > I £

i- E2 - Vp J 2 (9) ■

When η E1 = E2, equation (9) can be simplified to give .

Doorno τ λ «. ^ E2 _τ 32Τ2 . L
= S2T2 log e ^ type "" ^L 3ΪτΤ ⁺ 2 (10)

If for folding in the middle 1 _ 32T2

2 - FTfT (11)

then D = S2T2 log e - ^ L. = a constant (12)

The conditions η E1 = E2 and

1 32T2 " _Λ _ _ί _ " C1

2 ⁼ 3ΪΤΤ ^{WOrin n} -

therefore make D a constant and satisfy the conditions ,, thus the workpiece is folded in half.

The above mathematical derivation of the invention assumes direct current as the charging current for the capacitor, while in the description a pulsating charging current was assumed. It is therefore

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required the relationship between direct current as charging current and to show pulsating charging current.

In Fig. 8 the curves are for both direct current and charging current also shown for pulsating charging current. The curve for direct current as charging current is at 44 and the curve for pulsating charging current denoted by 46. It should not be the time that the DC charging current needs to be a capacitor to voltage Charge Vp, and ti 'the time it takes for the pulsating charging current to charge the same capacitor to voltage Vp.

On the impulse delivery curve 46 is then

t1 ^f = P (r1 + r2)

where ι P denufetet the number of received pulses (i.e. the number of cycles)

r1 the duration of the pulse (i.e. the character duration) r2 is the time interval before a subsequent pulse (i.e. the gap width).

In addition, 1st P = Lp

where L is the length of the workpiece to be folded and ρ is the pulse speed.

\. ^{t1 /} T1 χ

The charging voltage V »B1 (1 - e) for direct current

and V »E1 (1 - β) for pulsating current.

jjjl- ti »

- 10 -

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but if r2 = 0 for the pulsating current, then the charging current is Direct current.

. ti = Lpr1

. T1 '= Tl Lp (r1 + r2) = T1 (rl + v2) - Lpr1 r1

if the pulse duty factor is 1: 1, then r-1 = r2

and T1 * = 2T1 '■

but ti * = Lp (r1 + r2 (= L

S1

where S1 is the speed.

. St = P. 1 r2) P (Π 1 ⁺ r2) Pactor (r1 + _. β TI
ρ rT = e S1T1 ^r

_x (Π + r2)

x _{x T1}

r1 = a constant

S1 T1 'is independent of the speed.

When substituted into equation (11), S2T2 is a constant and can

S1T1

by appropriate selection of T1, T2, ρ and ti, 1_ ♦ ·
2

From the foregoing it can therefore be seen that when setting the Detector and switch at this distance D from the fold of the Circuit the required palte in any workpiece length within of the range 0 <L ^ 2 D delivers.

■■■■ ... - 11 -

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■ In the above description it was assumed that the speed of the sponsor has not changed. If the conveyors always move at a constant speed, the second transmitter 24 and the pulse generation circuit JO can be omitted. A constant DC voltage similar to that mentioned above is equivalent to the second pulse train can be introduced into the circuit R2-C2 when the workpiece has passed the unit 14 and the circuit R2 - C2 its corresponding proportion of the charge received from the circuit R1 - C1.

The previous description only referred to a single fold in the Workpiece 16. A second fold and subsequent folds can be obtained by passing the workpiece back through the device and on the Fold is passed over. In such a case, the charge remaining in capacitor C1 may after part of it on the capacitor C2 has been transferred by a corresponding Switching device with a different actuating circuit RJ - CJ further divided, which is similar to the circuit R2 - C2.

Another embodiment for performing further folding operations is shown FIG. 9 depicting a resistive capacitor circuit similar to that shown in FIG.

The difference between the circuit of FIG. J and that of FIG. 9 is basically that in FIG. 9 the second capacitor C2 and the second resistor R2 are formed by two capacitors C2 ¹ and CJ * and by two resistors R2 ^f and RJ * are replaced.

The catfish effects of the two circuits are similar in that the

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The first capacitor is charged by the first detector and transmitter unit 1-4 (as described above), but the charge absorbed by the first capacitor is ^{shared between the two additional capacitors C2 1} and CjJ ¹ , which can have the same capacitance.

The additional capacitor C2 * is first charged by the second transmitter 24 and later discharged into the output circuit of FIG Fold the workpiece Λ once.

Then the capacitor C3 ^{1 is} charged, either by the second transmitter or by a further transmitter that is connected to another fold. Then the capacitor C ^! discharged into the output circuit of Fig. 4 so that another fold signal goes out, which causes the workpiece to be folded a second time,

By using the above method, in one flat workpiece any number of folds will be made ».

In order that successive flat workpieces moving along the conveyor 10 are easily folded at different points along their length either the resistors and / or the capacitors should be of the resistor-capacitor circuit can be made variable. . '"

Claims

; ■ .. ■■■ ;. - .. 13'-;

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Claims (1)

Attachment file number for one from $. June 1968 Sch // Name d. Ann ,. THOMAS BROADBENT & SONS LTD. Claims 1. Control device for a machine for splitting a flat Workpiece, characterized by a first detector and transmitter unit W (1 4), which displays and measures a dimension of a moving workpiece (16) and transmits a signal, the value of which is representative of this dimension, to a first information memory which receives this signal through a device for transmitting at least part of the Signal in the first information memory from the first memory to a second information memory and through a second transmitter (24), which sends a further and cumulative signal representative of the passage of the workpiece at a fold (32) to the second information memory transmits, this one a * The folding process occurs when the required length of the workpiece has passed the fold 02) . 2. Control device according to claim 1, characterized in that each of the first and second information memory is an electronic one Is a circuit and contains at least one Speloher capacitor (C1, C2), the or each storage capacitor with its associated Transmitter (14,24) is connected by a resistor (R1, R2) so that < the arrangement in this way a resistor-capacitor circuit ; _t ^r R1, C1 and R2, C2) forms, j '- 14 - 109816/0885 j5. Control device according to Claim 1 or 2, characterized in that the device for transferring at least one part of the signal first stored in the first information memory the second information store includes a switch (22) which is shown in the closed position switches the two storage tanks in parallel, with or without the addition of other circuit elements which make the ratio regulate this storage (Fig. 3). 4. Control device according to claim 1, 2 or 3, characterized in that that a third information memory is provided together with a device for splitting and transmitting the residual signal stored in the first information memory after the original information transferred to the second information store has been, so that a further convolution by the third memory of the workpiece can be effected. 5. Control device according to Anspiach 1,2 or>, characterized in that a third information memory (R3 ^f i ^c 3V) is provided together with a device (40) for dividing the original information transmitted to the first information memory (R1, C1) between the second information ^{memory (R2 I} , C2 ¹ ) and the third information ^{memory (R5 1} -, C> ^f ), so that the third memory can effect a further folding process (Fig. 9). 6. Control device according to one of the preceding claims, characterized in that the moved workpiece (16) during the Measuring its length and during the or each folding process of one Strap or ribbon (10,12) is worn. - 15 - 109816/0885 r 7. Control device according to one of the preceding claims, characterized in that the transmitter unit (14) contains a gear, which is rotated by the passage of the workpiece (16), the teeth of the gear being arranged to form one Alternately interrupt and restore the light beam that strikes a photoelectric cell (15). 8. Control device according to claim 7 *, characterized in that the output signal of the transmitter unit (14) to a pulse generating circuit (11) is supplied, which contains a Schmitt trigger stage, which is followed by a monostable multivibrator which has a sequence of Pulses (19) of constant width and constant height with a speed proportional to the speed of the workpiece supplies. 9. Control device according to one of the preceding claims, characterized in that the first detector (13) is designed in the form of a test switch which is activated by the passage of the workpiece is opened on the same. 109816/0885 - 16 -