EP0562229B1 - Crimping tool for processing wire terminals - Google Patents

Abstract

Pliers for dressing conductor ends have two handles (3, 11) which can move relative to one another, a plurality of dressing stations for the conductor ends, and a drive device (21) via which the dressing stations can be driven during operation of the handles (3, 11). One of the dressing stations is constructed as a crimping drum (18) which can be displaced axially and is supported such that it can rotate and be coupled to the drive device (21) in the axially displaced position over only one dressing process. In this position, the station can be locked via a flange (52) which projects radially from it. This flange (52) extends over the overall circumference of the crimping drum (18) and has at least one recess (51). A locking tab (50a), which is arranged in a fixed position on the body (2) of the pliers and is radially opposite the flange (52), engages, in the undisplaced axial position of the crimping drum (18), into the recess (51), to be precise up to a point close to the outer surface of the crimping drum (18) while, in the axially displaced and rotated position of the crimping drum (18), the locking tab (50a) comes to rest above the outer surface of the crimping drum and engages behind the flange (52). Locking of the crimping drum (18) both in the rotational direction and in the axial displacement direction is thus possible by the locking tab (50a).

Description

The invention relates to pliers for processing conductor ends.

DE-A-2 149 167 is a toggle lever pliers with linear working path for pressing, punching, separating known, especially for the manufacture of non-releasable electrical cable connections, sleeves, chokes and end connections. The pliers hop this Knee lever pliers are made of flat, flat shaped plates formed in their position to each other through them penetrating pins, bolts, screws or Rivets are secured.

A pair of pliers with an axially displaceable crimping drum is already in EP-A-0 540 880 and in German patent application DE-D-59 204 908 of the same patent family, which were published after the priority date of the present application. These pliers contain two relative to each other movable handles, several processing stations for processing the conductor ends and a drive device via which when actuated the handles the processing stations can be driven. Of the mentioned processing stations is at least one as axially displaceable and rotatably mounted crimp drum, which is axially displaced Position via only one machining operation with the drive device detachable and in this position via a radially protruding from it Flange is lockable.

It has been shown that, particularly with frequently used pliers the locking device in terms of its wear resistance still needs further improvement. An even more secure feed is also intended of different contact elements to be crimped with the conductor ends Cross-section can be guaranteed if this in the die on Circumference of the crimping drum. Is one of the processing stations designed as a stripping station, the stripping process should also be further improved by the fact that it is practically not is controlled more depending on the path in order to achieve more uniform stripping forces generate and increase the ease of use of the pliers.

After all, the invention has for its object the pliers so that they further improve operational reliability having.

With the pliers according to the invention defined in claim 1, conductor ends in different Edit way, taking individual editing functions of the pliers are selectable, directly through the sequence of movements during the machining process. At least there is the crimping station with the help of a conductor end to be machined with the drive device detachable. The coupling of the crimping station with the drive device takes place immediately in the course of the movement of the conductor end or using the wire end itself, so that no more from the user Adjustment processes need to be carried out. With the pliers are therefore several processing stations that can be driven by the drive device available, but not all of them are permanent with the Movement of the handles are driven by the drive device. At least the crimping station remains as long as the drive device uncoupled until it is actually needed.

To improve the operational safety of this crimping station, extends According to the invention, the flange extends over the entire circumference of the crimping drum, wherein at least one recess is made in the flange. A fixed on the pliers body and radially opposite the flange The locking nose engages in the non-shifted axial position the crimp drum into the recess and up to near the surface of the Crimp drum inside, while the locking nose when axially shifted and the rotated position of the crimping drum to lie over its outer surface comes and engages behind the flange.

In contrast to the conventional design, in which the flange is through radially protruding tabs is formed, this flange now pulls over the entire circumference of the crimping drum so that it has a larger mechanical Has strength. It can no longer bend so quickly that a significantly longer life of the crimping drum and thus of the entire forceps.

The locking lug engages radially in the recess and is stationary on Pliers housing arranged. You can in a simple manner if necessary be replaced as they are wear or spare parts right from the start has been designed. The corresponding pliers were able to do this Locking walls cannot be replaced. They were unsolvable attached to the pliers housing.

The locking nose can preferably in the pliers according to the invention engage positively in the mentioned recess around the crimping drum to position exactly in the idle state with regard to their rotational position. In any case, the locking nose only engages so far in the recess a that they with axial displacement of the crimp drum and after subsequent Rotation of the crimp drum still over its outer surface reached. The locking nose does not prevent the crimp drum from rotating hindered if this has been moved axially.

Several dies can be attached to the circumference of the crimping drum of contact elements to be crimped with different cross-sections are, e.g. B. for crimping ferrules, and a corresponding number of recesses in the flange, each of which one is assigned to a die and at a predetermined distance from it lies.

This ensures that the crimping drum is always in its rotational position can be locked if there is one die in one for all dies provided loading position. In this case the locking nose engages into a flange recess that is assigned to another die is.

The recesses in the flange can open into further recesses, which are on the circumference of the crimping drum and at a predetermined distance to a die, the distance being selected so that a Crimp stamp is inserted into the further recess if that assigned die is in the loading position. The recess for the Leave the locking nose and the other recess for the crimping stamp generate themselves in one operation, which increases the manufacturing costs the crimp drum.

According to a very advantageous embodiment of the invention, the locking lug is connected in one piece with a bracket that extends into the crimping position the crimping drum is guided and there close to its outer surface lies.

This bracket allows a contact element to be crimped on position securely when it is in a die that is in the crimping position has been conducted. Crimping on a contact element A conductor end can then be made even more precisely, which leads to greater operational reliability the pliers are leading.

Preferably, the locking lug and the retaining bracket are spaced from two and parallel bars carried parallel to the Crimp drum axis run and are attached to the pliers housing.

One end of the parallel rods is in prepared openings inserted, which are located in the side of the pliers housing. The locking nose load-bearing rod is also at the other end of the rod in the pliers housing stored. An exchange of locking lug and retaining bracket leaves accomplish this in a particularly simple manner. Through the two parallel rods is also a rotation lock of locking nose and retaining bracket received, resulting in exact positioning of these two elements leads. The bars also create a certain Preload for the retaining bracket if one is in a die Contact element is guided into the crimping position and in the radial direction presses against the bracket on the outside. The contact element is thereby fixed particularly securely in the die, regardless of the cross-sectional size of the contact element.

The locking nose can according to a further advantageous embodiment of the Invention in one piece with a protruding from the pliers housing Adjusting lever must be connected to unlock or turn the crimping drum to be able to, if it is in its normal state, so not axially displaced or not coupled to the drive device is. If the adjusting lever is actuated, the locking lug becomes out of the recess led out in the flange of the crimping drum, so that now a desired Can be brought into the loading position, namely by turning the crimping drum by hand.

Locking lugs, retaining brackets, rods and adjusting levers are preferred formed by a single molded plastic part, which is particularly inexpensive can be produced so that it is preferred as a wear element lets use.

According to a further very advantageous embodiment of the invention a further crimp drum-controlled increase in the operational safety of the pliers Transport device for feeding from one another in the form of a band connected contact elements to a die with a transport lever provided that one at its end facing the crimping drum has approach between the contact elements and on is hinged at its other end below a transport plate, wherein one of these elements between the transport plate and the transport lever spreading compression spring lies.

In accordance with the rotation of the crimping drum, the Transport plate away from the crimping drum and transported back to it, the next time the transport lever is transported back Takes contact element and pushes it into the die, the now in the loading position. The transport lever is relatively stable or consists of a stiff arm, so that a perfect transport the contact elements or ferrules in the direction of the crimping drum is guaranteed.

The compression spring can, for. B. surround a mandrel helically, which with the transport lever is firmly connected and protrudes through the transport plate. The compression spring is supported on the one hand on the underside of the transport plate and on the other hand on the transport lever.

According to a further and also very advantageous embodiment of the Invention is to increase the operational safety of the pliers in the area of the end of the transport lever facing the crimping drum and the contact elements depressing stamp provided.

This pressure stamp prevents contact elements, pressed by the transport lever towards the crimping drum in front of the crimping drum when a die is out the crimping position into the loading position by rotating the crimping drum is returned, but has not yet reached the loading position.

According to a development of the invention, the pressure stamp is on one End of a support arm located above the transport plate, the other end of which is mounted on a transverse wall which prevents the movement of the Transport plate limited in the direction of the crimping drum.

This creates a close structural unit of the pressure stamp and transport device receive.

A locking slide can be arranged above the support arm in order to the support arm to preset the height of the pressure stamp. The location of the pressure stamp perpendicular to the transport direction of the contact elements or ferrules can then be in accordance with the diameter the contact elements or wire end sleeves can be selected.

For this purpose, there is an attachment on the underside of the locking slide with an oblique guide groove into which one on the support arm attached pin engages. Because the height of the locking slide, the outside is attached to the pliers housing, remains unchanged, can be in the Horizontal movement change the height of the pressure stamp, This is due to the inclined guideway in which the pin to be led. However, this is the vertical movement of the support arm so limited that it does not hit the transport plate of the transport device beats.

According to a further embodiment of the invention, another of the processing stations a stripping station that has a swiveling jaw has, which via a between the drive device and movable Clamp jaw knee joint can be driven. With the help of this Knee joint can be essentially a pressure-dependent control of the Stripping station realize what a convenient handling of the pliers Consequence. The movable jaw is no longer driven via an element rolling on a control surface of the clamping jaw, see above that no related wear and tear can occur.

A pulling element can be driven via a knee lever of the knee joint, connected to the cutting and stripping jaws in the clamping jaws are used to cut and strip the conductor insulation. The toggle lever can directly against an extension of the tension element beat, over which the tension element is also guided in the pliers housing. The tension element therefore does not need an additional drive attachment to be provided.

Preferably, the one connected to the movable jaw Toggle lever on a lateral pin which is in a guideway of the Pliers body is guided. This guideway is in the direction of rear end of the pliers curved so that the movable jaw The stripping station opens when the pin opens the rear part of this Leadership reached.

Of course, the pliers can also have additional processing stations have, for example a cutting station for cutting Ladders. However, this cutting station does not necessarily have to be via the drive device are driven. The cutting device of the Cutting station can also be attached directly to the handles.

Fig. 1 einen Längsschnitt durch die Zange bei nicht zusammengedrückten Handgriffen,

Fig. 2 einen Querschnitt durch einen oberen Handgriff der Zange entlang der Linie A - A in Fig. 1,

Fig. 3 einen Querschnitt durch einen unteren Handgriff der Zange entlang der Linie B - B in Fig. 1,

Fig. 4 einen vergrößert dargestellten Längsschnitt durch die Zange im vorderen Zangenbereich,

Fig. 5 eine perspektivische Darstellung eines zum Abisolieren verwendeten Zugelements der Zange,

Fig. 6 eine perspektivische Ansicht der linken Seite des Zangenkopfs von hinten,

Fig. 7 eine perspektivische Ansicht der linken Seite des Zangenkopfs von vorn,

Fig. 8 eine perspektivische Ansicht der vergrößert dargestellten Crimptrommel mit beigeordneter Vorratsstation für Aderendhülsen,

Fig. 9 eine Seitenansicht der Crimptrommel nach Fig. 8,

Fig. 10 einen Crimphebel mit eingesetztem Crimpstempel,

Fig. 11 Crimphebel und Crimpstempel in perspektivischer Darstellung,

Fig. 12 einen Transporthebel derAntriebseinrichtung, mit dem die Crimptrommel kuppelbar ist,

Fig. 13 eine perspektivische Ansicht einer Transporteinrichtung für Aderendhülsen,

Fig. 14 eine perspektivische Darstellung des vorderen Endes des oberen Zangengriffs im Bereich eines Druckstempels, und

Fig. 15 einen Längsschnitt durch den oberen Zangengriff nach Fig. 14.

An embodiment of the invention is described below with reference to the drawing. Show it:

1 shows a longitudinal section through the pliers when the handles are not compressed,

2 shows a cross section through an upper handle of the pliers along the line A - A in Fig. 1,

3 shows a cross section through a lower handle of the pliers along the line BB in FIG. 1,

4 shows an enlarged longitudinal section through the pliers in the front area of the pliers,

5 is a perspective view of a pulling element of the pliers used for stripping,

6 is a perspective view of the left side of the pliers head from behind,

7 is a perspective view of the left side of the pliers head from the front,

8 is a perspective view of the crimp drum, shown enlarged, with an associated supply station for wire end ferrules,

9 is a side view of the crimping drum of FIG. 8,

10 a crimping lever with inserted crimping die,

11 crimping lever and crimping stamp in a perspective view,

12 shows a transport lever of the drive device with which the crimping drum can be coupled,

13 is a perspective view of a transport device for wire end ferrules,

14 is a perspective view of the front end of the upper pliers handle in the area of a pressure stamp, and

15 shows a longitudinal section through the upper pliers handle according to FIG. 14.

1, the pliers 1 according to the invention have a one-piece, hollow pliers body 2, the rear part by one upper and immovable handle 3 is formed. The front part of the Pliers body 2 is in the form of a fixed jaw 4. A lid 5 of the pliers body 2 is pivotable about an axis 6, so that the inside of the pliers body 2 from the upper side of the pliers 1 ago is accessible.

A bearing pin 7 is in the lower area of the pliers body 2 a movable jaw 8 pivotally mounted. It is fixed Jaw 4 opposite. A knee joint with a first knee lever 9 and a second toggle lever 10 serves to drive the movable Clamping jaw 8 and acts on it in an area that supports the bearing journal 7 protrudes to the rear. The knee joint will be detailed later described.

A lower handle 11 of the pliers 1 is in one piece with a drive part 12 connected, the drive member 12 by means of a journal 13 on Pliers body 2 is pivotally mounted. The lower handle 11 is thus via the drive part 12 and the pivot pin 13 pivotable on the body of the pliers 2 held so that a relative movement between the lower handle 11 and upper handle 3 is possible. A tension spring 14 engages above of the journal 13 on the drive part 12 and on the other hand with the pliers body 2 connected at a point which is in the direction of the upper Handle 3 lies. With the help of the tension spring 14 is the lower Handle 11 turned clockwise around the journal 13, see above that the tension spring 14 tries to keep the handles 3 and 11 in spread Hold position.

A short row of teeth or a tooth gap 15 at the rear end of the drive part 12 works together with a spring-loaded and in the pliers body 2 rotatably mounted locking hook 16 as a lock against early Opening the pliers 1.

In the upper and front part of the pliers body 2 there is one Crimping station 17, to which a crimping drum 18 and a crimping lever 19 belong. As will be explained later, the crimping lever 19 is operated with the aid of the drive part 12 driven while the drive member 12 for rotation the crimping drum 18 ensures, with the aid of a transport lever 20, which can be seen in FIGS. 4, 6 and 12. The drive part 12, the knee joint 9, 10 and the transport lever 20 form a drive device 21.

2 shows a cross section through the upper handle 3 the line A - A of Fig. 1. As can be seen, the upper handle is 3rd formed hollow and has a in its lower region Floor 3a, which is laterally connected to the walls of the handle 3. The bottom 3a also extends out of the handle 3 into the body of the pliers 2 into and is guided up to the crimping station 17. By doing from the bottom 3a, the upper handle 3 and the lid 5 cavity formed contact elements can be saved with wire ends too are crimped, for example wire end sleeves 22, which are chained together in a band are. You will find one near the crimping station 17 storage and transport station 23 positioned on the floor 3a the crimping station 17 supplied.

3, the cross-sectional shape of the lower handle 11 is closer shown. It is a cross section along the line BB in Fig. 1. The lower handle 11 is towards the upper Handle open and essentially U-shaped.

With reference to FIGS. 4 and 5, the most important are as follows Components for performing the stripping function described in more detail. The same elements as in Fig. 1 to 3 are given the same reference numerals Mistake.

Between the fixed jaw 4 (see Fig. 1) and the movable Clamping jaw 8 is a pair of cutting jaws 24, 25 arranged are integrally connected to an elongated tension element 26. Cutting jaws 24, 25 and tension element 26 can, for. B. made of plastic be. The upper cutting jaw 24, which on the fixed jaw 4th (see Fig. 1) bears an adjustable end stop 27 for a stripped Conductor end 28. The end stop 27 is in a longitudinal slot 29 can be moved by clamping. Point to sides facing each other the cutting jaws 24 and 25 in the front area of the knife 30 and 31 to cut the insulation of the conductor end. The lower one Cutting jaw 25, which is flexible or pivotable in its rear area connected to the upper die 24 is moved by the movable Clamping jaw 8 out. The movable jaw 8 rotates the trunnion 7 clockwise around, so on the one hand, the end of the conductor 28 clamped between the jaws 4 and 8, while on the other hand the cutting jaws 24 and 25 are also moved towards one another, so that the knives 30 and 31 cut the insulation of the conductor end 28 can. The movement of the lower jaw 8 and thus also the lower cutting jaw 25 thus takes place by driving the knee joint 9, 10, as will be explained.

The knee joint 9, 10 also serves for the longitudinal displacement of the Cutting jaws 24 and 25 towards handles 3 and 11.

As already mentioned, the upper and lower cutting jaws 24 and 25 are in one piece connected to the elongated tension element 26. This tension element 26 has two horizontal transverse arms 32 and on opposite sides 33, which are guided in opposite longitudinal slots 34 (Fig. 1) are located in the side area of the pliers body 2. The horizontal cross arms 32 and 33 can be rectangular or have a round cross-section. In the case of a rectangular one Cross-section is a rotation of cross arms 32 and 33 in the longitudinal slots 34 not possible.

The horizontal cross arms 32 and 33 are pressed together the handles 3 and 11 acted upon by the knee joint 9, 10 to move elongated tension element 26 to the rear, which is discussed in more detail becomes.

At the rear end of the elongated tension element 26 is one behind top eyelet 35. In this eyelet 35 engages a spring F, the other End is connected to a pin S, which in turn on the drive part 12 is attached. Releases the knee joint 9, 10, the transverse arms 32 and 33, the elongated tension element 26 becomes so by the elastic force of the spring F. and with it the cutting jaws 24 and 25 back towards the front the pliers moved. That from upper and lower cutting jaw 24 and 25 and elongated tension element 26 existing component can simplicity also be referred to as an elongated tension element.

As can be seen from FIG. 4, the knee joint 9, 10 consists of the first toggle lever 9 already mentioned and the one already mentioned second toggle lever 10. The first toggle lever 9 has at its lower end a bead 9a which in the rear part of the movable clamping jaw 8 is rotatably mounted. Likewise, the second toggle lever 10 has in its upper Part of a bead 10 a, which in a bearing 36 of the drive part 12 is rotatably mounted. Both toggle levers 9, 10 can be rotated via a pin S ' connected with each other. The toggle lever 9, 10 is therefore between the drive part 12 and the rear end of the movable jaw 8, the protrudes the journal 7 towards the rear end of the pliers. About that in addition, the bearing 36 is in a position that is related to the Bearing pin 13 is moved in the forward direction of the pliers 1.

If the lower handle 11 is thus rotated in the direction of the upper handle 3, so at the same time the drive part 12 rotates around the bearing journal 13. The rotation takes place counterclockwise. The means that the knee joint 9, 10 is subjected to a compressive force becomes. The movable jaw 8 around the journal 7 in Turned clockwise, i.e. towards the fixed one Clamping jaw 4 so that the jaws close. Becomes one by construction of the knee joint 9, 10 reaches predetermined pressure, so breaks the knee joint 9, 10 in Fig. 4 to the right, ie towards the rear End of the pliers 1. The cross arms 32 and 33 are by a Stop surface 9b of the first toggle lever 9 carried and in the direction moved to the rear end of the pliers, and with them also the cutting jaws 24 and 25. On the outer side of the first toggle lever 9 is a Pin 9c in a guide path, not shown, on the inside of the pliers housing is guided. This guideway is in the rear end so curved that the jaws open again when the pin 9c this reached the rear end of the guideway. The stripped wire end can then be removed from the pliers mouth.

If the handles 3 and 11 are released again, they can due to the tensile force of the spring 14 remove from each other again on the one hand, the drive part 12 is rotated clockwise around the bearing journal 13, so that the knee joint 9, 10 stretches again. On the other hand, the elongated tension element 26 due to the action of the elastic Spring 35 moved forward. This continues until a lower approach 10b of the second toggle lever 10 from behind against the first toggle lever 9 beats.

When moving the elongated pulling element 26 to the rear end of the pliers the insulation of the conductor end 28 is stripped from the conductor while the stripped insulation with the opposite movement laterally falls out of the pliers mouth.

6 and 7 show the more precise structure of the pliers in the area of Pliers head.

The drive part is integral with the front part of the lower handle 11 12 connected, as already explained. The drive part 12 has two parallel wall areas 12a and 12b, each form the extensions of the side walls of the lower handle 11 and can also be cross-stiffened with each other. Openings 37 in the front side walls of the lower handle 11 are used to hold the pin S for fastening the spring F. The tooth gap 15 is only present on the right wall element 12b.

6 shows that an opening 13a in the left wall element 12a is available for the journal 13 and the bearing 36 for receiving the one end 10a of the second toggle lever 10. In addition, in both Wall elements 12a, 12b openings 38 for fastening the tension springs 14 intended.

There are also angled in both wall elements 12a, 12b Guideways 39 in which a pin 40 of a crimp lever 19 is guided becomes. This pin 40 extends through both guideways 39, are arranged congruently.

The right wall element 12b is also located on the outside thereof a pin 41 (see FIG. 12) which fits into an angled guideway 42 engages at the end of a transport lever 20. This transport lever 20th provides the coupling between the drive part 12 and the crimping drum 18 shows how to run.

Last but not least, a counter bearing 43 for receiving a to recognize the cutting conductor. This counter bearing 43 works together with a knife 44 (Fig. 1), which in the area of the counter bearing 43 is performed or this crosses when the handles 11 and 3 are pressed together become. In Fig. 1 is a conductor to be cut with provided with the reference numeral 45. The knife 44 can, for example be attached to the inner side wall of the pliers body 2. It covers up a slot 46 in the side wall into which the conductor can enter.

The components required for crimping are shown below Pliers 1 described in detail.

1 and 4, the crimping drum 18 is in the upper front Area of the pliers body 2 stored. The crimp drum 18 is one Axis 18a rotatable, on opposite side walls of the pliers body 2 is attached. The axis 18a runs practically perpendicular to the Pliers level. In addition, the crimping drum 18 is on this axis 18a can also be shifted by a certain amount in the axial direction, whereby it is biased forward in the axial direction by means of spring force, that is looking at Figs. 1 and 4 from the paper plane. 1 and FIG. 4 show a top view of the front of the crimping drum 18.

As can also be seen, the crimp drum 18 has on its circumference a plurality of dies 47, 48, 49 running in the axial direction, as shown in particular in FIG. 8. These dies 47, 48 and 49 are suitable for holding contact elements to be crimped with the conductor ends, which can be end sleeves, for example. The dies 47, 48, 49 can be of different sizes to different sizes Use ferrules for conductors with different cross-sections to be able to. The dies 47, 48, 49 are preferably on the circumference the crimping drum 18 arranged at equal angular intervals.

As can be seen in FIGS. 4, 6, 7, 8 and 9, the crimping drum 18 instructs on its rear side a radially protruding circumferential flange 52 which is present in the entire circumferential area and only through recesses 51 is interrupted, which on the surface of the crimping drum 18 run in their axial direction. Each die 47, 48, 49 is one assigned to these recesses 51, which in the figures mentioned in Clockwise in front of the respective die. The distance between dies and assigned recess is chosen so that the Recess is in the crimping position when the assigned Die is in the loading position. In Fig. 8 z. B. the direction of insertion for a conductor in the crimping drum 18 represented by the arrow E. In Insertion direction E taper the dies and are through the back Circumferential flange 52 closed. The recesses 51 have the Purpose to include a crimp stamp when the respective die is in the loading position, as will be described.

Becomes a conductor from the conductor insertion side (from the front in Fig. 8) into a die 47 to 49 inserted, in the direction of arrow E, it gets there Tip against the circumferential flange 52, which leads to the fact that with appropriate Pressure the entire crimp drum 18 axially shifted backwards becomes. Subsequent rotation of the crimping drum 18 for transfer the loaded die into the crimping position then becomes the axial position the crimp drum 18 locked, as will be described. The axial displacement the crimping drum can thus be locked for a certain time. When the crimping process is complete, the crimping drum is 18 turned back, after which the lock is released, so that the crimping drum 18 axially again due to spring force can move, and in their starting position.

To lock the crimping drum 18 both in its circumferential direction as well as in its axial direction serves a locking element 50. The locking element 50 has a locking nose 50a, a bracket 50b, two parallel Rods 50c and 50d and an adjusting lever 50e. All elements 50a to 50 e are integrally connected to each other and consist, for. B. made of plastic. The locking element 50 is best in FIGS. 4, 6 and 7 to recognize.

The two parallel rods 50c and 50d, which are parallel to the axis 18a of the crimping drum 18 are at the same end each firmly inserted in corresponding recesses, which are located on the inner side wall of the pliers housing 2 are. With the rod 50c at this end the locking nose 50a is connected, which in one of the recesses 51 engages, specifically in the area of the peripheral flange 52, when the crimping drum 18 does not move in the rest position or axially Position. The locking nose 50a only engages so far in the Recess 51 that its tip is no deeper than the lateral surface of the Crimp drum 18 comes to rest. In this state the crimping drum can 18 can therefore no longer be rotated, since the locking nose 50a in the Circumferential movement path of the circumferential flange 52 lies. The crimp drum 18 is thus locked, with a die, here die 47, in the loading position. Should another die in this state the loading position can be brought, the adjusting lever 50e can be operated, such that the locking lug 50a out of the path of the peripheral flange 52 is unscrewed around the rod 50c serving as an axis. Now lets the crimp drum 18 rotate, by hand and over a corresponding Opening in the pliers housing 2. Is another die in the Has been brought into the loading position, the locking nose 50a then snaps back into place a corresponding recess 51. The rod 50c is also on their other end stored in the pliers housing 2 while the rod 50d is not held in the pliers housing at this end.

The bracket 50b is also attached to both rods 50c and 50d, which runs below the crimping drum 18 and into the crimping position is introduced. The bracket 50b is located on that of the locking lug 50a rod end facing away. The tip of the bracket 50b comes to lie to the side of a crimp stamp to be described and near the circumference of the crimping drum 18. If one is in a die lying wire end sleeve by rotating the crimping drum 18 in the Guided crimping position, it is radial there with the help of the bracket 50b pressed into the die and thus fixed, so that a perfect Crimping can take place.

The bracket 50b is also supported on the rod 50d, making it elastic is resiliently biased towards the crimping drum 18. The locking nose 50a and the bracket 50b are therefore at different ends the handrail 50c. Furthermore, the rods 50c and 50d can be different Have cross-section. The first one can round one Cross-section, while the latter have a square cross-section can own.

If the crimping drum 18 is axially displaced, in the direction of Arrow E in Fig. 8, to be coupled to the drive device, the peripheral flange 52 also shifts relative to the locking lug 50a, so that when the crimping drum 18 rotates, the locking nose 50a above the lateral surface of the crimping drum 18 and laterally to the peripheral flange 52 comes to rest. Since the locking nose 50a in the axial direction of the Crimp drum 18 is firmly positioned, the latter is now in the axial direction fixed in its axial position by the locking lug 50a, since the peripheral flange now 52 is pressed against the side of the locking lug 50a. First when the crimping drum 18 has been turned back to its original position the locking lug 50a comes back into the area of the recess 51, so that now the crimping drum 18 axially forward into the starting position can move back.

On the back of the crimping drum 18 there are axially extending projections 54 at a predetermined angular distance from the dies 47 to 49, as best shown in FIGS. 8 and 9. If the crimping drum 18 is displaced axially in the direction of arrow E by inserting a conductor end into a die 47 to 49, one of the projections 54 also comes into engagement with a vertical slot 55 at the other end of the transport lever 20. It is shown in FIG. 12. Since the crimping drum 18 is now locked in its rear axial position by the crimping nose 50a, the crimping drum 18 can now be rotated by means of the drive part 12 via the transport lever 20. Overall, when the handles 3 and 11 are pressed together and during the subsequent spreading process, there is a movement of the crimping drum 18, in which a die is first rotated from the loading position into the crimping position and then rotated back into the loading position. In the present example, three dies are provided for contact elements or wire end sleeves. For example, the respective dies can accommodate wire end sleeves for cross-sectional sizes of 0.5 / 0.75 or 1 / 1.5 or 2.5 mm ² . So that the conductor end can follow the rotary movement of the crimping drum 18, there is a corresponding circular segment-like slot on the wall of the pliers body 2.

Fig. 12 shows the detailed structure of the transport lever 20. It exists from a key-shaped plate that is on its front End has the vertical slot 55 and one at its rear end angled guide slot 42, the opening angle to the vertical slot 55 is directed. The transport lever 20 can between Back wall of the pliers body 2 and the rear side of the wall element 12b.

10 and 11 is the exact structure of that already mentioned Crimp lever 19 shown. The crimping lever 19 carries a crimping stamp 56, which is appropriately introduced to an element to be crimped when this is brought into the crimping position by the crimping drum 18 has been. For this purpose, the crimping lever 19 has at its lower end a bearing device 57, via which it can be pivoted in the pliers body 2 is stored. The bearing device 57 can, for example, be a reinforced one Be hollow cylinders through which an axis A passes (FIGS. 4, 6 and 7) which is attached to the pliers body 2. The crimping lever 19 is then pivotable about this axis A.

At the end of the crimping lever opposite the bearing device 57 19 this is provided with the already mentioned pin 40, which is parallel runs to the axis of the bearing device 57. With this pin 40 the crimping lever 19 engages in the angled guideway 39, which is is located within the drive part 12, more precisely within both Wall areas 12a and 12b. This creates a particularly stable connection achieved between drive part 12 and crimp lever 19.

4 and 13 each show a side view and a perspective View of a transport device for the ferrules. This Transport device, which is provided with the reference numeral 23, has a transport plate 58 on the crimp drum 18 to and from the Crimp drum 18 is movable away. On the lower side of the transport plate 58 is a transport lever 59, which is on the crimping drum 18 pointing end a gripping between the ferrules Approach 59a has. At its other end is the transport lever 59 hinged to the transport plate 58, between the Transport plate 58 and the transport lever 59, a compression spring 61 is present is that spreads both elements. The compression spring 61 surrounds a mandrel 62 helical (see Fig. 7), which is firmly connected to the transport lever 59 is and the transport plate 58 protrudes upwards. It supports the compression spring 61 on the elements 58 and 59. Will the crimp drum 18 axially shifted with the help of a conductor end so that the peripheral flange 52 comes to rest behind the locking nose 50a, and will then the crimping drum 18 is rotated from the loading position into the crimping position, so an overhead one of the protrusions 54 takes the transport plate 58 with, in other words pushes it away from the crimping drum 18. namely via a ramp slope 63 for the projection 54. The ramp slope 63 is best seen in FIG. 13. Will the transport plate 58 moved by the projection 54 away from the crimping drum 18, so a spring lying on an extension 64 of the transport device 23 65 excited so that when the crimping drum 18 is back in its loading position has reached and it has been moved axially forward again is, the transport plate 58 and with it the transport lever 59 via said Tension spring 65 can be moved to the crimping drum 18 and the next Push the ferrule 60 into the die in the loading position. An elastic element 66 serves to return the wire end sleeves 60 in their axial starting position.

When the transport device 23 moves from the crimping drum 18 the transport lever 59 only slides away over the wire end sleeves 60, because it is resilient. The exciting thing about this movement Compression spring 65 is supported on the one hand on an extension 67 of the extension 64 and on the other hand on a transverse wall 68 through which the extension 64 runs through, as can be seen in FIG. 7. Against the movement the transport device 23 in the direction of the crimping drum 18 by a hook-shaped formation 69 limited at the free end of the extension 64, that hits against the transverse wall 68 from behind. This transverse wall 68 is firmly mounted in the upper handle 3. The transport device 23 is on Lid 5 mounted so that when you lift the lid 5 with raised becomes. The transport plate 58 can in lateral guideways in the Be stored inside the lid side walls.

14 and 15 show the structure of the upper handle 3 in detail Area of its front end. On its top is a locking slide 70 arranged towards the front and rear pliers end is movable. On the underside of the locking slide 70 is a shoulder 71 molded in one piece, which has an inclined guide groove 72. This guide groove 72 extends in the longitudinal direction of the handle 3 and down towards the front end of the pliers. Into him engages a pin 73 of a support arm 74 which has rear lugs 75, which are fixedly mounted in the transverse wall 68. There, so to speak Pivot formed for the support arm 74, which is practically below the upper Cover of handle 3 is. On the front and the crimping drum 18 facing end of the support arm 74 is a U-shaped Stamp 76, the two legs 76a and 76b on the Wire end sleeves 60 are prepared and act on them. Depending on Diameter of the wire end sleeves 60 can then the locking slide 70 so be moved so that the pressure stamp 76 on the wire end sleeves 60th comes to rest to prevent them from being in the area immediately in front of the crimping drum 18 due to the pushing pressure of the transport lever 59 rearing up.

The transport lever 59 of the transport device 23 comes between the Legs 76a and 76b of the pressure stamp 76 to lie, the Transport device 23 is located directly below the support arm 74. The Legs 76a and 76b of the stamp 76 can have different lengths be around the wire end sleeves 60 in the area of their metallic sleeve and in the area of their insulation ring, in these areas different diameters are available. If the cover 5 the support arm 74 is also raised. Now ferrules can be refilled.

The operation of the pliers 1 during crimping is described in more detail below.
If a conductor end is inserted into the die 47 which is in the loading position, the crimping drum 18 is thereby displaced axially to the rear, against a spring force. In the process, the peripheral flange 52 reaches an axial position which is displaced with respect to the locking lug 50a. At the same time, the projection 54, which is assigned to the die 47 in the loading position, engages with the vertical slot 55 of the transport lever 20. If the handles 3 and 11 are now moved towards one another, the peripheral flange 52 comes behind the locking lug 50a, so that thus the axial position of the crimping drum 18 is locked. At the same time, the die 47 moves from the loading position towards the crimping position.

When the handles 11 and 3 are pressed together, the drive part 12 rotated around the journal 13, in the figures against the Clockwise direction. First, the transport lever 20 is in the direction moved to the crimping drum 18 because the pin 41 in the upper region the angular guide 42 is located. That means that first a rotation of the crimping drum 18 by the movement of the transport lever 20 takes place. The die 47 comes in from the loading position the crimping position before the crimping lever 19 rotates. While the time in which the crimping drum 18 moves the aforementioned distance rotates, the pin 40 moves within the angular guide 39 only in the horizontally lying branch, so that the crimping lever 19 during movement the drive part 12 is initially not taken.

After reaching the crimping position by the die 47, the handles 3 and 11 further compressed, the pin 40 of the now runs Crimp lever 19 in the vertical branch of the guide 39 upwards, so that the Crimp lever 19 rotated counterclockwise about its bearing axis A. becomes. The crimping die 56 is pressed into the ferrule, which is in the crimp position at this time.

During this last part of the movement of the handles 3 and 11 is running the pin 41 in the lower branch of the guide 42, from the center down so that the transport lever 20 is not moved. Becomes So the crimp stamp 56 pressed against the ferrule, so it remains Crimp drum 18 at rest.

If the handles 3 and 11 are then relieved, the tries Spring 14 to spread the handles 3 and 11. The spring 14 thus pulls the Drive part 12 in a clockwise direction around the bearing journal 13. This runs on the one hand the pin 41 in the lower branch of the guide 42 up to the latter middle region without the transport lever 20 thereby moving back becomes. The crimping drum 18 therefore initially remains at rest. On the other hand in contrast, during this first spreading phase of the pin 40 in the vertical Branch of the guide 39 down, so that the crimp lever 19 in the clockwise direction is rotated about the bearing axis A. The crimp stamp 56 will therefore removed from the crimping drum 18. Are the cones 41 in the central area of the guide 42 and the pin 40 in the lower area of the vertical branch of the guide 39, the next movement phase begins. Now the pin 41 runs in the upper area of the Guide 42 and thereby pulls the transport lever 20 towards Handles 3 and 11 back. About the vertical slot 55 is the Pin 54 entrained, which opposes a rotation of the crimping drum 18 clockwise direction. The die 47 is thus returned to the loading position. During this second phase of movement the crimp lever 19 remains practically at rest, now the pin 40 only runs in the horizontal branch of the guide 39.

As soon as the die 47 has reached its loading position, the transport lever 20 has therefore been withdrawn completely (to the right in FIG. 4), the peripheral flange 52 is released from the locking lug 50a, so that the Crimp drum 18 is pressed forward again, due to the arranged between it and the rear wall of the pliers body 2 spring. The projection 54 is also removed from the vertical slot 55, so that no more coupling between the transport lever 20 and Crimp drum 18 is present. At the same time, the backward movement the crimping drum 18, that is to say by the axial backward displacement Run-up slope 63 is released since the projection 54 lying on it also is withdrawn. The transport plate 58 can thus due to the force the spring 65 a further wire end sleeve 60 in the one in the loading position Push the die in.

It should be noted that due to the rotation of the crimping drum 18 in and counterclockwise to the crimp drum 18 returned to the axial starting position every movement cycle is, that is from the drive device or the transport lever 20th is decoupled.

If the crimping drum 18 is not axially displaced by a conductor end, then there is no coupling between the projection 54 and the transport lever 20. When merging the handles 3 and 11, the same still run Operations as described above. On the one hand, the transport lever is now 20 moves back and forth while the crimping lever 19 is pivoted about its pivot axis A. The crimp stamp 56 is thus always moved into the crimping position, even if the die is in the Loading position should be. In order to damage the To avoid crimping drum 18, this has the existing in your surface Recesses 51 on, as already mentioned. These recesses are in the crimp position when the associated die is is in the loading position. The crimp stamp 56 can therefore also last carry out its full movement.

Claims (16)

1. Pliers for dressing conductor ends, having two handles (3, 11) which can move relative to one another, a plurality of dressing stations for dressing the conductor ends, and having a drive device (21) via which the dressing stations can be driven when the handles (3, 11) are operated, one of which dressing stations is constructed as a crimping drum (18) which can be displaced axially, is supported such that it can rotate, can be coupled to the drive device (21) in the axially displaced position over only one dressing process, and in this position can be locked via a flange (52) projecting radially from it, wherein

   the flange (52) extends over the overall circumference of the crimping drum (18),

   at least one recess (51) is incorporated in the flange (52), and

   there is a locking tab (50a), which is arranged in a fixed position on the body (2) of the pliers, is radially opposite the flange (52), engages, in the undisplaced axial position of the crimping drum (18), in the recess (51) to such an extent that its tip does not come to rest deeper than the outer surface of the crimping drum (18), and, in the axially displaced and rotated position of the crimping drum (18), comes to rest over its outer surface and engages behind the flange (52).
2. Pliers according to Claim 1, characterised in that the crimping drum (18) has on its circumference a plurality of dies (47, 48, 49) for holding contact elements (22, 60) which are to be crimped on and are of different size, as well as a corresponding number of recesses (51) in the flange (52), of which in each case one (51) is allocated to a die (47, 48, 49).
3. Pliers according to Claim 1 or 2, characterised in that the recesses (51) in the flange (52) open into further recesses (51), which are located on the circumference of the crimping drum (18) and at a predetermined distance from a die (47, 48, 49).
4. Pliers according to Claim 1, 2 or 3, characterised in that the locking tab (50a) is integrally connected to a retaining bracket (50b) which is guided into the crimping position of the crimping drum (18), and is located close to the outer surface of said drum there.
5. Pliers according to Claim 4, characterised in that the locking tab (50a) and the retaining bracket (50b) are supported by two rods (50c, 50d) which are located at a distance from one another and parallel to one another, run parallel to the crimping drum shaft (18a), and are attached to the housing (2) of the pliers.
6. Pliers according to one of Claims 1 to 5, characterised in that the locking tab (50a) is integrally connected to a control lever (50e) which projects from the housing (2) of the pliers.
7. Pliers according to Claim 6, characterised in that the locking tab (50a), retaining bracket (50b), rods (50c, 50d) and control lever (50e) are formed by a single plastic injection-moulded part.
8. Pliers according to Claim 1, or one of the following claims, characterised in that a transportation device (23) which is controlled by the crimping drum is provided in order to feed contact elements (60) which are connected to one another in the form of a strip to a die (47, 48, 49) using a transportation lever (59) which, on its end pointing towards the crimping drum (18), has a projection (59a) which engages between the contact elements (60) and, on its other end, is pivoted underneath a transportation plate (58), a compression spring (61) which spreads these elements being located between the transportation plate (58) and the transportation lever (59).
9. Pliers according to Claim 8, characterised in that the compression spring (61) surrounds a peg (62) in a helical manner, which peg (62) is firmly connected to the transportation lever (59) and passes through the transportation plate (58).
10. Pliers according to Claim 8 or 9, characterised in that a pressing stamp (76) which holds down the contact elements (60) is arranged in the region of the end of the transportation lever (59) pointing towards the crimping drum (18).
11. Pliers according to Claim 10, characterised in that the pressing stamp (76) is attached to one end of a supporting arm (74) which is located above the transportation plate (58) and whose other end is supported on a lateral wall (68) which limits the movement of the transportation plate (58) in the direction of the crimping drum (18).
12. Pliers according to Claim 11, characterised in that a latching slide (70) is arranged above the supporting arm (74) in order to preset the height position of the pressing stamp (76) above the supporting arm (74).
13. Pliers according to Claim 12, characterised in that a projection (71) having an obliquely running guide groove (72) is attached to the underneath of the latching slide (70), into which guide groove (72) a peg (73) which is attached to the supporting arm (74) engages.
14. Pliers according to Claim 1 or one of the following claims, characterised in that another of the dressing stations is an insulation-stripping station, which has a clamping jaw (8) which can pivot and can be driven via a toggle joint (9, 10) which is located between the drive device (21) and the moving clamping jaw (8).
15. Pliers according to Claim 14, characterised in that a toggle lever (9) of the toggle joint (9, 10) drives a pulling element (32, 33) to which cutting and peeling-off jaws (24, 25) are connected, which are guided in the clamping jaws (4, 8).
16. Pliers according to Claim 15, characterised in that the toggle lever (9) which is connected to the moving clamping jaw (8) has, on the side, a peg (9c) which is guided in a guide track on the body (2) of the pliers.

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