DE1928764A1 - Method and device for bending metal strips, in particular for producing electrical resistors - Google Patents

Description

La Telemecanique Electrique 33bis, avenue Marechal Joffre, Nanterre, Hauts de Seine,]? Rance

Method and device for bending metal strips, in particular for producing electrical resistors

For the production of grilles for various applications (which can simply be of a decorative nature) it has already been proposed to bend a sheet metal band into meanders, i.e. to a shape with rectilinear, parallel parts which are interconnected by substantially semicircular parts are connected.

In particular, electrical resistances can be produced in this way, which generate a considerable thermal effect can, which can be either an electrical heater or that such resistors are switched on in the power circuits of electric motors to their torque or speed characteristics to change.

In the special lall of the grid-like electrical resistances it can be stated that these already after different Process were manufactured, for example

9008 81/0202

'by. Casting of cast grids, by punching out sheet metal grids in the press or by forming metal strips on carriers. However, it has been found time and again that the best results are achieved when using metal strips with a uniform cross-section, because the current density is evenly distributed and thus the heating is the same at all points of the metal, whereby it is possible to use a minimum of metal and avoid cracking or twisting. The well-known band-shaped However, resistors generally consist of elementary sections attached by means of connectors and need to be connected to each other. A bank or group of resistors thus consists of a plurality of bundles formed from these tapes, thereby multiplying the number of connections and at each of these connections there is a risk that it will become loose due to the effect of the heating.

The invention enables a simple bending of a metal strip to meander, eliminating all of the aforementioned disadvantages of the known electrical resistors be eliminated. In general, the invention enables the creation of grids for all types of applications made of a metal band.

In particular, a grid, and in particular a resistor from a metal strip emerging from a roller, whereby the length of the grids or resistor sections is not limited. The invention also enables manufacture a resistor formed from superimposed grid sections without a. Joining or piercing of the tape would be required. Finally, the invention relates to mechanical molding devices which have different dimensions both in terms of width and thickness.

9098S1 / 0202

Eungen exhibiting tape can record, so that all desired electrical characteristics can be achieved,

The method according to the invention for meandering bending of a metal strip consists in that the strip is rectilinear in one of a number of elongated ones, one below the other

^ Haschen educated Forming a chain connected / template is held and that this template is pushed into a straight guide and is brought to a stop on a device which is reciprocated transversely with an amplitude can, which is equal to the length of a pocket, where the Distance between the movable device and the exit of the rectilinear guide preferably at the beginning of each Alternating movement is kept equal to the length of a pocket.

By the combination of the thrust exerted on the stencil and the reciprocating movement of the movable device The bending begins each time at the point of articulation of two pockets, and the chain of pockets is folded into yourself in the manner of an accordion, that the tape contained in it due to the fact that the tape part enclosed in a pocket is rectilinear is held, is folded in a meander shape, while those Part that is between two consecutive Bags located, is bent in the shape of a half cylinder.

In an advantageous embodiment of the invention, the device which can be moved to and fro is a slide carried, which is movable on a horizontal table on which the chain of bags slides, with the carriage is moved to the distance from the jiide of the rectilinear guide, v; uring the stop of the slide and the beginning of a

909881/0202 _Em qrk31NAL

^{1 of} the reciprocating movement are controlled by a device with electrical contacts, which is actuated by a lug carried by each of the pockets when they pass through a precisely defined point during their movement in the rectilinear guide.

Despite the fact that every stencil bend increases the thickness

folded
of the part of this template is increased, the distance between the end of the guide eb of the last pocket turned to this end, which is transverse to the template, is kept constant and equal to the length of a pocket.

According to a particularly advantageous embodiment of the Invention, the bags consist of elongated plates that are arranged on edge on the table and in their upper hand, or in its upper narrow side have a slot which is intended to receive the tape to be bent is. These plates are in the chain alternating on one side and the other with the preceding and the following plastics / connected while on that of the articulated connection opposite side of the end edge of each plate is extended so that it is in a straight position of the Chain is supported against the corresponding edge of the adjacent plate. This is on the side of the joint Edge shortened and rounded essentially in the form of a quarter circle in order to match the adjacent edge of the adjacent panel in the folded position of the adjacent panel to form a substantially semi-cylindrical surface.

It should be noted that the dimension of the slot of the Plates in terms of width and depth determine the dimensions of the strip to be bent, these plates nevertheless they can all have the same length and strength,

909 0 81/0202

to be treated or used in the same bending machine to be able to.

The articulation, which is a bending of two consecutive Panels by 180, can consist of one flexible element or several flexible elements, for example, wise cables, exist. This connection preferably consists of a hinge connection, and the hinge / are

.p-u -J-J -τ-, τ, or. formed in one piece. _ " firmly attached to the plates, freeing the axis of the articulation is in the hinge.

tab
Such hinges / have the advantage that they alternately have on one side and the other side of the plates for controlling the electrical contacts in order - as already mentioned - to control the running of the machine. The longitudinal drive acting on the chain and the longitudinal thrust are preferably generated by a counterweight in such a way that the thrust is always present, if necessary, has a constant value and does not depend on the changes in speed of the chain of pockets in their rectilinear guidance.

To reduce the space requirement of the machine and increase For their safety, the chain of pockets for their longitudinal drive is firmly connected with an endless chain, d_ie in one is arranged for the rectilinear guidance of the chain of pockets parallel plane and in engagement with a gear which is attached to a drive device that slides on a limited path and the train of the counterweight is exposed. In this way the gear driven by the hotor lifts, turning it in the direction of the Progress of the endless chain acts and is supported on this is to re-establish the counterweight, which as a result of its weight exerts the pull that is necessary for the infinite

909Ö81 / 0202 ^{ßAD 0WQWAL}

Chain and the chain of bags' are required. It will If the gear wheel is moved in the opposite direction, this has the consequence that the counterweight is lowered to a stop and then drives the endless chain in the opposite direction.

According to another special feature of the one used in particular for the production of resistors from bent strips The method according to the invention is then, when a series of meandering bends is formed in the band, loosened this band from the chain of bags, then pushed the entire bag chain backwards, which was on top of it Way forms a kind of container in its central recess can take up a new part of the straight belt again, to make a second series of bends when it returns to the front form, this row is optionally removed from the first by a non-bent band part.

According to another specialty of the production of curved Tape resistors used in the method according to the invention is a tape length consisting of at least two Accordion-shaped folded, separated by an unfolded part sections consists on the unfolded part subjected to a loop formation and two folds or bends symmetrical with respect to the loop, and in such a way that one section is brought under the other, the bends each in the same plane and the two sections are folded in the shape of an accordion.

The invention also provides a mechanical device which enables these various operations to be carried out for bending or splitting the tape and for designing the bent or »folded tape.

900081/0202 BADORtGlNAL

Further details and advantages of the invention are explained below with reference to the drawing; in this shows:

Pigur 1 is a perspective overall view of a implementation machine suitable for the process according to the invention for splitting or bending strips,

Figure 2 is a partial elevation view of this machine, Figure 3 is a partial plan view of this machine,

FIG. 4 is a corresponding enlarged sectional view the line IV-IV of Fig. 3> the

JIg. 5 to schematic top views of the machine, which Reveal details of how they work,

Figure 11 is a plan view of a portion of the chain of bags, "

Figure 12 is an elevation view of this section showing

13 and 14 enlarged representations of an articulated hinge the chain of bags, in the aligned and folded position,

15 is an enlarged sectional illustration correspondingly the line XV-XV of Fig. 3,

16 is a sectional view along the line XVI-XVI of Fig. I5,

Fig. 1? a top view of a belt with two meandering curved sections and a straight connecting part,

Fig. 18 the same band which in its rectilinear part has a loop that spans the two sections offset in height,

19 shows the band shown in FIG. 18 after it has been bent again of the sections in such a way that they lie one on top of the other Levels are located,

^! Fig. 20 is a view along the line XXII-XXII of FIG. >'. the

BAO ORIGINAL 909881/0202

Pig. 21 to 23 illustrations to explain the training a loop in a straight part of the ribbon,

Fig. 24 - a plan view of one for making the latter Loop specific machine that

Pig. 25 and 26 section views corresponding to the line XXVII-ZXVII and XXVIII-XXVIII of Fig. 24,

Pig. Figure 27 is a section and elevation view of a machine for carrying out the schematized in FIG. 18 indicated Operations, and the

Fig. 28 is a plan view of this machine.

The machine shown in Figs. 1 to 3 has the form of an elongated table 1, at one end on a suitable Drum 3, the metal band 2 is arranged, which is to be bent to * meanders.

For the purpose of a possible straightening traverses this band the are staggered between a Eeihe of rollers 5 _S whose fixed axis, located tree. Beyond these rollers, the belt is located between two guides 6a and 6b, it being arranged in a chain of pockets 7, which is shown in detail in FIGS a hinge axis 8 is attached to the guide carriage 9, which can be moved transversely to a carriage 11 under the action of a winch 10, which carriage is itself movable in the longitudinal direction with respect to the table 1.

The movement of the machine, and in particular the movement of the slide 11, is controlled by means of two contacts , which are to be referred to as limit switches 12 and 13 and at the ends of the track or the stroke of the guide carriage be operated, i.e. when the opposite Sides "l · '+ and 15 of the U-shaped legs of this guide

909881/0202 bathroom original.

Carriage itself, in each case in the extension of the guides 6a and 6b are located. For reasons that will be explained below, the end part 16 of the guide 6b can. one to the table Pivot 1 vertical axis 17 to take position 16. The button 18, which makes it possible to carry out the opening process of the part 16 by hand, controls by means of its end an electrical contact in such a way that the process of bending the tape can only be started when the part 16 is in the extension of the guide 6b. The reverse is - as will be seen - the return movement only possible if key 18 is in position 18, * .

The carriage 11 is along the table 1 by means of a screw 19, which is driven by the electric motor 20, is displaceable. For this purpose the screw 19 engages (see Fig. 4-) into a nut 21 firmly connected to the carriage 11. Fig. 4- also shows in detail the design of the guide member 22, which is firmly connected to the guide carriage 9 is, T-shaped and this guide carriage on the massive cross member 23 of the carriage 11 in contact holds and acts on the rods 24 of the contact organs 12 and 1.3.

Each of the pockets of the pocket chain, which is articulated with its front end on the axis 8 attached to the guide carriage 9, consists of a composite plate 25 which is formed by two metal plates 27, 28 which are fastened to one another by screws 26 which the The excess thicknesses or beads 29 with which these plates are provided at their bases are pressed against one another. Thus, each pocket or plate having along its upper edge a longitudinal slot 30 x> whose width and depth of each represent the width and thickness of the strip to be treated. The plates 27 and 28 have on one side to their top

909881/0202

- ίο -

Ren edge through a plane 31 perpendicular to the plate limited end and on the other side a rounding, the shape of which corresponds to a quarter of the cylinder 32 substantially. In each plate 25, the ends of the alternate Plates 27 and 28 from. Each of the plates 25 has two notches 33, the depth of which is greater than that of the slot 30 is and which ones with. Help - e device are intended to loosen the lattice formed by the bending of the ribbon to meander from the plates or pockets 25 to allow.

Below the plate part occupied by the slot 30 each plate 25 is provided with a hinge element at each of its ends 34 and 35 firmly connected, each of these elements has two hinge tabs, which thus form two pairs of hinge tabs lying one on top of the other. The axis 36, which is guided with play through the holes in these hinge brackets, is inserted in these by a ring 37 in held their position, which is drawn on this axis and enclosed between the two pairs of hinge tabs.

The hinges for joining the successive panels thus form on the side surfaces of the flat plate chain projections 38, which are located alternately on one and the other side of the chain.

As can be seen from Mg. 13, the openings 39 are The hinge tabs are elongated in the direction of the plate and also have in the transverse direction of the plate 25 has a width that is slightly larger than the diameter of the axis 36. Accordingly, the chain has in the aligned State, i.e. when two adjacent ends 3IA and 3 ^ B at each other lie, their maximum length, because - as Fig. 13 shows the Openings 39 of the hinge elements of the plates 25, which

909881/0202

are arranged in abutment, then the axis 36 between include their internal parts.

It can be seen that, when the disc 25B is folded at the plate 25A in such a manner that it reaches the position shown in MG14 position, the tape 2 progressively substantially in the shape of a half circle around the then interconnected rounded parts 32A and 32B is bent, but this folding movement does not produce any significant shortening of the band 2 to its semicircular configuration, due to the fact that the plate chain shortens towards the center of the curvature and the axis 36 comes to rest against the outer parts of the openings 39 The bending length of the chain is thus shortened by the size d on the concave side of the arc formed by the curved band, ie by the extension of the openings 39

The play of the axis 36 in the transverse direction within the openings 39 then enables with the help of a device the compression of the corrugated layered plates in order to absorb the elasticity of the curved ligament. to eliminate.

To simplify the manufacture of the hinges, each of the openings 39 can be given a circular shape whose through knife equal to the axis 36 increased by the play d, the resulting additional spacing of the bends of the belt subsequently by that already mentioned Compression process is eliminated.

The projections 38 of the chain of pockets, which in the in Pig. 3 are directed downwards, are intended to act on two contacts 40 and 41, which are separated by the length of a plate 2>

BATH ORIGINAL

909081/0202

removed and mounted in the pivot part 16. How regarding 5 to 10 will be explained in more detail this contacts the reciprocating motion of the guide carriage 9 and the step-by-step displacement of the slide 11.

The chain 7 of the plates 25 is hinged to the rear on a rectilinear guide 42, the length of which is that of several Plates 25 corresponds and which by means of the in FIGS and 16 and 16 and described with reference to these figures fixed to the endless chain 4J is connected, which runs at its rear end via the gear 45 and at its front end via the gear 46. The gear or pinion 45 is mounted on a carrier 47, which is intended to allow the tension of the chain 43, by sliding in the plane of this chain. A winch 48 is also attached to this carrier, which acts against the surface of the gear 45 to block it.

The upper run of the chain runs along its entire length over a belt 49 made of polyamide resin, the friction of this reduced with the table 1 in contact chain and allows a drive with reduced friction.

15 and 16 show an embodiment of the guidance of the pocket chains and the drive of these chains the chain 4J.

The guides 6a and 6b each consist of two horizontal ones Plates 70 wid 71? on which two vertical plates 72 and 73, the function of which is to receive the upper part of the guide 42 or the plates 25, i Recess or groove for receiving or mounting the tape 2 is provided. The lower part of this straight line guide 42 and the plates 25 is thus free under the plates

909881/0202

70 and 71ϊ which makes it possible to carry out the approaches 38 and here the contactor actuated by the approaches. The plates 70 and 71 are fastened to the top of the table 1 by means of bolts 74 which are guided through hollow supports 75.

The guide 42 carries the articulated connection with the last of the plates 25 of the chain 7 on the front part and rests on it the table 1 via slide shoes 66 made of super polyamide on * -

This guide is also firmly connected to a rail 76 which has an elongated hole 77 into which a comb engages, the teeth 79 of which engage in the spaces in the chain 43. The comb 78 is freely arranged in the recess 77 , but is subjected to the action of a spring 80 in such a way that the thrust of the chain 43 which is exerted on the comb 78 is caused by this spring 80, which plays the role of an elastic damping device, is transmitted in the direction in which the chain of pockets emerges from the guide. In the opposite direction in which the comb 78 comes to rest at the end of the recess 77, the drive of the guide 42 by the chain 43 is direct. '

The lower run of the chain 43 runs equally in that front part of the machine, in contact with the polyamide tape 50 carried by the metal bridge 51 which in turn is carried by the bearing of the pinion 46 and by a support 52.

The part of the chain that is in contact with the polyamide tape 50 is in mesh with the pinion or gear 53 of a group consisting of the motor and reduction gear 54-55. The carrier 56 of this group can be along two parallel, cylindrical rods 57 in the longitudinal direction of the table 1 slide.

909881/0202 _BÄD

_ 14 _

On the motor and reduction gear group 54-55 a chain 58 is attached, which over rollers 59 and

60 runs and a counterweight 61 carries. If it is assumed that the gear 53 is blocked and the counterweight 61 is raised is (position shown in Fig. 2), the counterweight 61 tries the lower run of the chain 4-3 in the direction of the arrow F to drive, i.e. it tries via the guide 4-2 the entire chain 7 to the left in Figs.

The group consisting of motor and reduction gear is on its guides between two end contacts 62 and 63 moveable. When she meets contact 6-5, i.e. when that Counterweight 61 has practically arrived on the ground, the group consisting of motor and reduction gear becomes 54-55 set in motion in the direction which ensures the advancement of the chain 4-3 in the direction of the arrow eyelet F, and in such a way that the group is in advance of the progress of this chain, the counterweight 61 again raises until it meets the Eadkontakt 62 again, the their movement stops and the sprocket 53 is blocked again. In this way, the movement of the chain 4-3 in direction of the arrow F these are constantly subjected to a constant force, which is essentially the weight of the counterweight

61 corresponds.

5 to 10 serve to explain the operation of the machine in a process of bending to meander.

At the beginning, a certain length of the tape 2 is made by hand

in
pulled off and - pushed the entire length of the then straight chain 7. The end of this band is bent at right angles by means of any device in such a way that it can be introduced into the recess 44 that protrudes between two over the guide carriage 9

BATH ORIGINAL

Λ ,, 900881/0202

Plates is formed, in such a way that it is level with the upper edge of the chain 7 of pockets or plates 25 is located.

The initial situation thus corresponds to that shown in FIG. 5 Arrangement. The guide carriage 9 is pushed back into the extreme position - according to this figure below - in such a way that the contact 13 is actuated, which is when the machine is in operation is set ", the displacement of the slide 11 in the direction of the arrow 6A- allows or triggers.

Pushed by the counterweight 61 accompanies the chain this advance movement of the carriage until the point in time at which the lug 38b of the chain 7 on the push button of the Contact 40 hits. This contact controls the stopping the displacement in the direction of arrow 64 of the carriage 11 and likewise the winch 10 in the direction of exercise a train on the guide carriage 9. At this point (Fig. 6} is the extension 38a, i.e. the corresponding hinge of the chain 7, straight out of the space between the guide rails 6a, 6b so that the first! Pocket 25a under the conjugate action of the continuous thrust exerted by the counterweight 61 and that of the Winch 10 pulls against the plates which define the recess 44 'between which the end of the Tape is included.

However, as soon as the guide carriage9 reaches its upper extreme position reached in Fig. 7, the contact 12 is actuated, whereby the notor 20 to move the carriage 11 in Direction of arrow 64 is put back into operation. This sledge thus drives the 'link chain up to your point in time on (Fig. B), to which the extension 38c the contact 41

909881 / Ö2Ö2

BAt) ORIGINAL

operates, whereby - as before - the drive motor 20 of the Carriage 11 stopped and the release of winch 10 ' is effected in the direction of thrust or thrust. The pocket 25b is then in a position in which it is against the pocket 25a in the between the legs 14-15 of the Guide carriage 9 located space can be folded.

Fig. 9 shows an intermediate stage in folding the bag 25b. When this flipping over is complete, the extension 38c (Fig. 10) has come into the immediate vicinity of the contact 40, so that the actuation of the contact 13 leads again to that the carriage 11 is set in motion in the direction of arrow 64, this advancing movement to a standstill occurs when contact 40 meets lug 38c, causing pocket 25c to flip over is, under the same conditions as in the case of the folding of the explained with reference to FIGS. 5, 6 and 7 Pocket 25a.

The control circuits for stopping the motor and the circuits for controlling the winch 10 both in terms of thrust the train is also delayed, so that the time of the machine is delayed To provide them for full execution the bending work up to the complete folding of the plates 25a, b, c ... against each other and to achieve the accordion-shaped Folding needed.

It should be noted that the arrangement of the two contacts 40 and 41 which are separated by the length of a plate, and the control of these contacts by the lugs which are separated by the length of two panels, automatically ensure that the chain links are bent in alternating directions. The approaches 38x, y, ζ ..., which are on the other side of the chain,

909861/0202

It turns out to be part of the automatic control of the number of folds or bends to be performed by the machine can be used. Once the machine cycle has been initiated, so it is continued until the control obtained by means of one of the approaches 38x ... ζ stops this cycle.

In this embodiment, the carriage 11 is every time advanced in the direction of arrow 64 by an amount, which is just equal to the thickness of a plate 25, making it possible to use the plate 25, which is straight from the rectilinear guide has emerged to exert the bending effect in such a way that that supplied by the winch 10 Bending force has practically no effect on the panels themselves it is only applied to the band via the two hinges of the panel during the folding process.

After the bent or folded band has been released in the manner already explained, the chain 7 is thereby reset again that the group 54-55 consisting of the motor and the reduction gear is active. opposite Direction is set in rotation. The movement consisting of the motor and the reduction gear comes into play during this movement Group on the right to the stop and brings the counterweight 61 back close to the ground, eliminating the dangers an improperly occurring drive by the counterweight 61 can be reduced.

Around the chain 7 in the space between the guides 6a and 6b traced back, the transverse guide carriage 9 after execution of the last complete Folding is in the position shown in FIG. 3 the part 16 of the guide is brought into position 16., and in such a way that a kind of funnel with the solid Part of the guide 6a for the return of the from the pockets

0 9 8 81/0202 BAD ORIGINAL

existing chain formed xfird. In fact, there is this chain under the action of the train directed to the right in FIG. 3 tends to arm a zigzag shape. Thanks to the funnel, the opening of which corresponds to the width between the legs 14-15 of the guide carriage, this chain consisting of pockets is made progressively flat and then into the space between the guides 6a and 6b to enter.

In order to compress the pocket chain 25 in whole or in part for the purpose of indenting the curvatures, can a vise fitted with a winch or an appropriate device can be used. Thereby is it is possible to obtain split or bent parts that are parallel to one another after this impression has been carried out. Such a thing Pressing in ensures the parallelism of the straight belt parts in a permanent manner by increasing the elasticity of the metal is removed at the level of the rounding. As can be seen in Figure 14, the plates are like 2> A and 25B after bending through a gap 81 from each other. separated by the play of the axes 36 in the transverse direction the openings 39 is allowed. After clamping this gap 81 is eliminated, and the Sundung 82 of the band 2 becomes longer and takes the shape 82a.

When the chain of pockets is compressed in this way the bent or folded tape can be removed from the pocket chain by means of an ejector winch which has tappets that engage in the transverse recesses 33.

By means of the machine described, its number of articulated pockets or plates 25

it is possible, obviously limited, / to produce an unlimited number!: l of meanders, since it is due to the approach _t which

909881/0202 _BAD

the plates "forming the slot 44- with respect to the upper side of the guide carriage 9, it is possible to have as many repetitions of folding or bending as desired the last straight meander part being received in the slot 44.

For the production of electrical resistors that are required to achieve the least amount of trees in a frame with must be attached parallel-epipedischer form, sections or bundles of meanders, preferably without Interruption of the tape be arranged one above the other.

For this purpose , the procedure shown in FIG. 17 can be used, ie a section S (which has the same number or a different number) can be applied to a section S. of meanders), a straight band part 100 being provided to connect the two sections. This band part can then be bent as shown in FIG. 18 in order to achieve a mutual displacement or displacement of the planes of the sections S and S ^.

For this purpose, on both sides of a short central segment 101, the two parts of the band section 100 are folded 180 ° in the opposite direction around two parallel bent parts 102, which are directed essentially at 45 °. Subsequently, it is sufficient to fold the parts S ^ and S ₂ in the direction of arrows 103 and 104 in the manner _"} that the bending parts are 10p, and 106 converted a right angle in a hairpin-shaped bent parts, so that the one shown in FIGS. 19 and 20 The section S ^ then lies exactly above the section S ₂ , ^ ¹ * ³ - ^ with the same meanders, their straight parts lie one above the other, while the rounded end parts lie in between « -., - '" -

$ 03881/0202 BADORiGlNAL

21 to 23 show a device by means of which this loop can be obtained in a belt part 100, which enables the height of the two successive meander bundles to be offset.

The tool consists of a die 107 with a groove 108 and a flat punch 109, the width of which is equal to that of the groove reduced by twice the amount of the thickness of the tape is. The band part 100 is arranged obliquely on the groove 108. To make the attachment of this part of the tape easier, The top of the die 107 can have an impression, the edges 110 of which act as a stop for the Tape margins are used.

In a first process, in which according to the arrow 111 * a pressure is exerted on the punch in order to force it into the groove 108, becomes a right-angled one as shown in FIG Bending of the two ends of the part 100 with respect to the central segment 101 is obtained.

In a second process, the two ends of the band part 100 are opposite to each other according to the arrows 112 and 113 Direction is folded in such a way as to obtain the result shown in Fig. 23, i.e. that the two ends 100A and 100B of part 100 facing opposite, parallel to each other and about the height of the segment 101 are offset.

The machine shown in Figures 24-26 is capable of performing these various operations automatically.

The winches 115, their rods (see Fig. 26) are connected to plates 117A and 117B, which are intended to correspond to the arrows

909 881/02 02 bad original

Len 112 and 113 directed pressures on the ends 100A and 100B of portion 100 of the tape. These plates and the piston rods guided in blocks 120 are moved at the level of the top of the die 107.

To ensure that it is pressed in, the stamper 109 is guided between the stops 121, which are firmly connected to the table. The pressure according to arrow 111 applied to the punch 109 is obtained by a finger 122 which is fixedly connected to a lever 125, on the opposite side to the finger äao the rounded end of the piston rod 124 of a winch 125 acts. The lever is pivotable about an axis 126 which is guided through one of the blocks 120, and the lever itself is mounted in a slot in this block.

The stroke end contact 127 enables the automatic operation of the device after it has been put into operation. This contact determines the end of the pressing of the Stamp 109 in the groove 108 and controls at this point commissioning of winches 115.

It should be noted that the small thickness in _{% of} the vertical plane of the lever 123 enables the two ends 100A and 100B and the bundles S 1 and Sp, which are firmly connected to them, to fold on either side of the planks of this lever.

The machine shown in Figs. 27 and 28 is used for Performing the operations shown schematically in Fig. 18 by arrows 103, 104 and 128, i.e., flattening the loop formed by segment 101, in such a way that its space requirement is reduced. This is done by a corresponding to the arrows 128

909881/0202

BATH

directed pressure and the folding down of the two sections S ₁ 'and S ₂ according to the arrows 103 and 10A-.

On the table 130 two plates 131 are attached, on the outer edges of which flaps 132 are hinged about axes 133 in such a way that the plates 35 are connected to one another in an articulated manner. The process of folding down and again lifting the flaps 132 is carried out with the aid of winches 134, the rods 135 of which in the elongated openings 136 through the table. I30 are performed.

To flatten the loop comprising segment 101 - .., the table has a recess 137 for receiving it Ribbon. The lever 138 is at its end with the flat hammer 140 is provided, which is mounted in a bracket 139 is. The flattening movement is obtained by the thrust of the rod 141 of the piston of the winch 14-2. The pivot axis 143 of the lever is mounted in a vertical axis 144, those in a warehouse provided in the table I30 rotatably mounted and firmly connected to a crank pin 145, which enables it to be opened by means of the winch 146 to judge.

For the manual attachment of the _{band 2, which is suitably shaped in sections S 1 and S 2} with a connecting part 100, the lever I38 is removed to the position 13S ₁ . Then the loop is flattened first. To do this, the lever is returned to the position indicated in full lines and the winch 142 is actuated. When the flattening is reached, the lever I38 is removed again, and the two flaps 132 are folded against each other by the pull of the two winches I34 in such a way that the sections S ^ and S ₂ are in the S ¹ Ig. 19 and 20 assume the position shown.

BATH ORIGINAL

909881/0202

In this way, an unspecified number of sections, which themselves have any number of meanders, are arranged one above the other. With this overlay all straight parts of the meanders are parallel to one another, practically evenly arranged one above the other and evenly spaced. As a result, these sections can be supported by insulating spacers with ELnkerbu__ngen are provided for receiving the upper and lower edges of the tape, for example at the ends of a each of the rectilinear parts.

A band folded or bent in this way represents a suitable choice of metal, for example, if the choice is made a stainless steel sheet, an electrical resistor which can dissipate a large amount of power Resistance can be used either for electrical heating or to control motors, which at develop high performance in variable operation, such as the pulling motors of lifting or machine tools *

- patent claims -

909881/0202

Claims (1)

Claims 1. / Device for bending a metal strip into meanders, \ / characterized in that the rectilinear Band is inserted into a stencil, which consists of a series of elongated, one below the other for training A chain connected pockets consists that this template in a straight line against a device is pushed and brought to bear on this, in the transverse direction in the form of a back and forth movement is movable, the amplitude of which is equal to the length of a pocket. 2. Device according to claim 1, characterized in that g e k e η η zeic.hnet, that the distance of the movable device at the exit of the rectilinear guide at the beginning of each alternation of the reciprocating motion is kept equal to the length of a pocket. 3 · Device according to claim 1, characterized in that the transversely movable one. direction is mounted on a carriage which is movable along a table on which the chain consisting of the pockets slides in the longitudinal direction, that the stopping of the carriage and the start of an alternation of the reciprocating movement are controlled on the one hand by a pair of stroke end contacts, which are actuated by the reciprocating device and, on the other hand, by a set of electrical contacts arranged in the path of lugs, many having the pockets in the course of their displacement in the rectilinear guide. 909881/0202 4. Apparatus according to claim 3, characterized in that the set of electrical contacts consists of two contacts which are arranged at a distance from one another which is equal to the length of a pocket is, and that these contacts, respectively, the displacement of the movable device in one and the other Steer direction, and that the tax rates on the The chain consisting of the pockets is separated from one another by two pocket lengths. 5. Device according to claim 1, characterized in that it is e k e η η ζ eichnet that the pockets consist of elongated plates, which one in their upper narrow side Have a slot for receiving the strip to be bent, that these plates alternate on one side and the other of the preceding and following plate are hinged that the end edge of the plate on the side of the slot opposite the hinge connection is extended in order to be in a straight line position of the pocket chain against that of the adjacent plate corresponding Edge to support, while on the side of the slit directed towards the articulated connection, this outer edge is shortened and rounded towards the inside of the slot towards a quarter circle. 6. Apparatus according to claim 5, characterized in that the Taschei ^ forming plates their lower part below the slot are connected to a hinge joint that the hinge openings oval and elongated in the direction of the length of the plate and that the width of these openings " is larger than the joint axis in the vertical direction. 909881/0202 * ?. Device according to claims 3, 4- and 6, characterized in that the hinge -. elements forming approaches act equally on the contact sets. 8. Apparatus according to claim 1, characterized in that the chain consisting of pockets is connected to an endless chain which, when tensioned, runs over two pinions or toothed wheels, which are arranged at the ends of the path of the pocket chain, that the endless chain is in engagement with the output pinion of a motor and reduction gear existing group, which can slide parallel to a strand of this endless chain between two stops that form stroke end contacts, and that this group is weighed down by a counterweight. 9. The device according to claim 1, characterized in that g e k e η η ζ e i chne t that the rectilinear guidance of the pocket chain is two flat and parallel to each other Comprises straps arranged at the level of the table carrying the bag chain around the upper edge to enclose these pockets, and that the end part of one of the two flat bands with respect to the movable Device is obliquely removable from the other by a distance equal to a length of a pocket to form a converging space. 10. The device according to claim 1, characterized in that the pockets have transverse notches have that are deeper than the depth of the recess: or Groove are. . BATH ORIGINAL 90980t / 0202 11. Apparatus for forming a complete turn forming loop in a rectilinear part of the belt, wherein the two tape parts directed in opposite directions are offset in their plane by a distance that is at least equal to the width of the band, g 'e k e η η draws by one with a groove and stops, which allow the tape to be attached across and at an angle to it Groove enable, provided die, a flat in this groove-engaging punch and two organs for folding of the belt, which in opposite directions on both sides of the groove, transversely to this and in a mutual Distance at least equal to the width of the belt are effective. 12. The device according to claim 11, characterized net that on the punch passed through its ends in its center opposite the center of the strip part crossing the groove is pressed by a finger that is firmly attached to it a rocker arm is connected, which is operated by a pressure winch. 13. The apparatus according to claim 11, characterized in ge k e η η, that the Umklapporgane consist of plates that are parallel to the plane of the edges of the groove The die is movable and operated by a winch are. 14. The device according to claim I3, characterized in that g e k e η η, that the control of the folding plates actuating winches is ensured by an end contact, which the end of the press-in stroke of the Sets the punch in the groove of the die. 909881/0202 15 · Device for flattening a by means of an arrangement Belt loop manufactured according to claims 11 to 13 * and for folding against each other two right-angled bends in the ones leading away from the loop häandern curved band parts are formed, thereby gekennz eich net that two on a table Flaps are provided which can be folded against one another and in which the curvatures engage that between them Fold a place for ITlaclimaking the intermediate loop provided is that the flattening tool is at one end of a Pivoting lever is attached, on the other end of which a pressure winch acts that the pivot axis by means of a Bearing pin is mounted, which is perpendicular to the table and allows zitfei positions of the pivot lever, namely an active position in the fold-over field of the flaps and an inactive position outside this field. 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