JPH0332430B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a welding device according to the preamble of claim 1, which can be used, for example, for welding tapes with very high welding takt times.

Known devices of the above-mentioned type operate, for example, in such a way that the contacts are supplied to the holding body via a switching wheel. Naturally, this mode of operation requires a larger welding device and a greater amount of kinetic energy to be controlled, which has a detrimental effect on control accuracy and operating speed. In other welding devices of the above-mentioned type, the contacts are cut off from one line of contact material by means of a hardened cutting tool and then transferred from the following line of material into the holding body in the next feed stroke.

In this case, in known devices, since many contacts are arranged side by side or in contact with each other, division errors of individual contacts accumulate, and a slight division error causes disturbance in the welding operation. Therefore, it has the disadvantage that the reliability of operation of the welding device is relatively low. In other known welding devices, the second, longer feed stroke always shifts the previously severed contact obliquely below the electrode within a special working tact, which has a detrimental effect on the working speed and the working accuracy. ,
There is also a risk, especially with very thin contact materials, of folding of the contact material that is displaced.

An object of the present invention is to configure the welding device described in the preamble of claim 1 so that it can achieve a high takt time, and at the same time can be miniaturized and improve the reliability of operation. That's true.

This object is achieved by a welding device having the features set out in claim 1.

According to the invention, each contact is individualized;
The operating precision and operating reliability of the welding device is increased since it is completely reliably conveyed under the electrode onto the holder through the supply section in a precisely defined position. The slit in the lifting fitting allows the
Since it is possible to return the lifting fitting from the raised position again, the very long stroke of the transfer fitting does not adversely affect the operating speed of the welding device. Since the movement of the transfer fitting and the lifting fitting no longer needs to be matched to each other after the individualized contacts have been raised to the level of the supply section, from this point on the movement of these elements is optimal simultaneously and independently of each other. This can be carried out with as little mass force as possible taking into account the movement course of the movement. Furthermore, since the lifting fitting is returned again immediately after the individualized contacts have been raised, and can already fulfill the subsequent operating function in this position, the operating speed or takt number that can be achieved with the welding device according to the invention is The absolute velocity of the parts being increased greatly and being moved can be kept small. This leads to relatively low acceleration forces and therefore also to the fact that the guided and driven parts can be carried out with low forces. The operational reliability and uptime of the welding device are thus further increased. By receiving the individualized contacts in the bore of the lifting fitting and in the feed section, an absolutely reliable and constant guidance that is only slightly influenced through the narrow slit can be achieved. A transfer fitting is used to shift the individualized contacts into the supply section.
Since only very small forces have to be applied to the individualized contacts, overloading is avoided even when using very narrow transfer fittings.

As mentioned above, this transport stroke can be made very long, since almost all the takt time can be utilized for the movement of the transfer fitting, which is decoupled from the movement of the lifting fitting, and therefore according to the invention The connecting device is versatile and can be used to weld contacts to tapes or carriers with a very wide range of widths.

Lifting fittings do not need to perform pure lifting movements unconditionally. The invention provides that the second feed section is offset in an arbitrary manner with respect to the first feed section of the guide tunnel, and that the transfer fitting receiving the individualized contacts has alternating holes provided therein. It should be emphasized that it can also be configured to be movable between two end positions such that it is aligned with the bores of both feed sections. The transfer fitting, in this general case, has a slit centrally transitioning into the hole, this slit serving to receive the transfer fitting, the dimensions of the transfer fitting being able to move freely through the slit. It is defined as follows.

Since the lifting fitting only has to move one individualized contact from the plane of the first supply section to the plane of the second supply section, its energy consumption and therefore also its kinetic energy can be kept very small. . A very narrow transfer fitting at the same time has a very small mass, which has an advantageous influence on the dynamic properties of the welding device.

The embodiment according to claim 2 has the particular advantage that the welding device does not need to be enlarged even when the lifting fitting is additionally given the function of a cutting tool. In this case, the welding device is configured such that the lifting fitting is returned to its lower position immediately after the passage of the transfer fitting and in this position the mold is already moved for a certain feed stroke during the movement of the transfer fitting. the contact material. After the transfer fitting has been returned to its position outside the slit, the lifting fitting is moved for the cutting process of the contact material.

The embodiment described in claim 5 contributes to further simplification of the welding device. This is because in this case the anyway necessary tact-lifting movement of the electrode can be used to periodically raise the lifting fitting. in this case,
The holes in the lifting fitting corresponding to the contact profile are such that the holes in the lifting fitting can already accept new contact material or new individualized contacts when the holding arm has not yet completely reached its welding end position. It is constructed as having some excess dimension. Preferably, the control is such that the holding arm together with the lifting fitting is lowered into a position immediately after the start of the feeding of the transfer fitting into a position such that the electrode is located in front of the welding end position by a small distance. This dimension is adapted to the oversize of the hole mentioned above so that the introduction of the later-supplied contact material is already possible at this location. In this position of the holding arm or electrode the contact is displaced from the transfer fitting between the welding electrode and the holding body.

In the embodiment according to claim 9,
The welding device can be used in any position and orientation without adversely affecting operational and functional reliability. The welding device may, for example, be attached to the device by means of a flange so that the transfer fitting performs a vertical movement. Since the contacts are received in a matching tunnel section, they can be guided to the electrodes without being lost and without additional suction and positioning devices.

According to the embodiment according to claim 10, the welding device is made more compact and even simpler, since only a single drive is required.

The embodiment according to claim 13 provides the additional advantage that the electrode or electrode material of the welding device can be changed very easily with a simple manual operation.

Further advantageous embodiments are indicated in the further claims.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

The welding device has a case 4 in which a holding arm 1 of an electrode 2 is supported rotatably and preferably with low friction via a shaft 3. The holding arm 1 forms one current-carrying part of the welding device and is indicated by arrow A in the drawing.
It is connected to the welding current cable at the point marked. Other electrodes, not shown in detail, are likewise connected to a welding current contact, which is mounted insulated on the underside of the housing 4.

Inside the case 4 there is located a curve holder 5 which is driven from the outside via a chain or other drive mechanism, on which a number of control curve segments and a front surface, not shown in detail, are located. A curved track 7 with machined sides is located.

The curve holder 5 controls the feeding, cutting and electrode movements in precise temporal relation to each other.

The cyclic movement of the holding arm 1 takes place via a cam follower roll 15 (indicated by dashed lines in the drawing) which is tangential to the control curve of the curved holding body 5 under the bias of a spring.

On the left in FIG. 1, the welding device is supplied with contact material 14, drawn for example from a band or coil. The contact material on this band is then fed by feed devices 8 to 13, which will be explained later, to a cutting station where individual contacts are produced, which are then brought to the welding electrode 2 for carrying out the actual welding process. and holding body 2
0. The welding device is operated in such a way that a feeding movement of the contact material, a separating movement and a wheeling movement of the individualized contacts take place during one working duct.

The contact material 14 is initially gripped in the welding device between the clamping piece 11 and the feed slide 9 which moves towards the replaceable stop 23. The movement of the feed slider 9 and the generation of the pressing force of the clamping element 11 are each controlled by a link 8 by one cam.
13, the links controlled by these cams are likewise controlled by the curves on the curve carrier 5. The elements of the curve-controlled link for the feed slide 9 and the pressure element 11 are biased towards the respective control curve of the curve holder 5 via externally settable springs 13 and 10. Thus, for example, spring 10
The feed force is set by the spring 13, and the clamping force between the feed slider 9 and the clamping piece 11 is set by the spring 13.
The contact material 14 is fed from the feed devices 8 to 13 into a feed section 24 which is configured in the form of a grid or as a guide tunnel. The cross section of the guide tunnel is matched to the respective cross section of the molded contact material 14. Supply section 2
4 terminates at a lifting fitting 21. As can be seen from FIG. 2, the lifting fitting 21 has a through hole 211 that substantially corresponds to the contact profile. The lifting fitting 21 can be reciprocated transversely to the direction of the feed section 24 between two end positions, the hole 211 of the lifting fitting 21 being in the one end position shown in FIG. at the supply section 24 and also at the other end position at the supply section 2 of the welding device.
Located in a straight line with 2. The feed section 22 is offset with respect to the feed section 24 by a dimension V which corresponds exactly to the working stroke of the lifting fitting 21. The supply section 22 is guided in such a way that its lower border line coincides with the surface of the holder 22.

As shown in FIG. 1, feed section 22 preferably extends parallel to and beyond feed section 24. The hole 211 in the lifting fitting 21 has one central narrow slit 212 on the side facing the feed section 22.
The length of this slit is selected in such a way that it does not cover the likewise narrow guide slit 221 of the feed section 22 in the lower end position of the lifting fitting 21. This guide slit 221
A transfer fitting 18 is arranged above the feed section 24 in line with the guide slot 221, which transfer fitting 18 can perform a reciprocating movement in the direction of the guide slot 221. This transfer fitting also has two end positions. In one end position shown in FIG.
located outside of. In the other end position, which is shown in broken lines in FIG. 1, the front end of the transfer fitting 18 is in such a position that it precisely positions the contact 19 to be welded under the electrode 2.

The transfer fitting 18 is also connected via the curved holder 5.
More specifically, it is driven via an envelope curve 7.

In the embodiment shown in FIG. 1, the lifting fitting 21 is designed as a cutting fitting, and during its movement from the plane of the feeding section 24 to the plane of the feeding section 22 the contact material 1 is shaped.
Make 4 cuts. In this way, the lifting metal fittings 21
Individualization of the contacts takes place during lifting. After the holes in the lifting fitting 21 are aligned with the holes in the feed section 22 in the raised position of the individualized contacts, the front end of the transfer fitting 18 is pushed into the slit 212, thereby A molded contact is guided from the bore 211 in the feed section 22 through which it is guided between the welding electrode 2 and the holder 20.

The supply section 24, the lifting fitting 21 and the supply section 22 always form a replaceable set of elements, which is preferably mounted on the top surface of the case 4 in an easily replaceable manner.

In the embodiment shown in FIG. 1, the lifting fitting 21 is not driven independently, but together with the holding arm 1 of the electrode 2. For this purpose, lifting fittings 2
1 is connected to the holding arm 1 by force connection via a claw-like plate 25 while being separated from the holding arm 1. Within the area of the lifting fitting 21, the holding arm has a hole into which a connecting rod 27 extends, the lower end of which engages the lifting fitting 21 and the supply section 24 in a forked manner and is removable. It is swingably mounted in the case 4 via a pin 6. The upper end of the connecting rod 24 is provided with a thread, onto which an adjusting nut 26 is screwed, and between this adjusting nut and a pressure plate supported in a hole in the holding arm 1, a A welding pressure spring 16 is inserted. The welding pressure spring 16 presses the holding arm via the cam follower roll 15 against the associated curve or cam surface of the curve holder 5.

Similarly, by rotating the adjusting nut 26, the spring 13
As explained above in conjunction with and 10, precise setting of the pressing force or welding pressure between the cam follower roll and the curve holder 5 can take place from the outside.

With the exception of the drive of the transfer fitting 18, in which a forcibly coupled link control of the feed link 17 is used, the movement of the other moving parts of the welding device is always against the springs 10, 13 and 16 as feed elements. This is also done by a curve as a return element.

In the following it will be explained how the movements of the parts of the welding device are carried out in the desired temporal relationship. Upon rotation of the curve holder 5, the curve segment of the control curve that is operatively engaged with the vibrating lever 12 descends, so that the spring 13 pulls the contact material 14 through the clamping piece 11 and the vibrating lever 12. Press it against the feed slider 9.

Now, the curve segment associated with the feed slide 9 is also lowered, so that the oscillating lever 8, which is associated with the feed slide, feeds the contact material 14 under the action of the spring 10. The feed stroke can be set by replacing the stopper 23. The contact material 14 is displaced through a grid-shaped feed section 24 of the guide tunnel to a lifting fitting 21 located near the lower end position. The lifting fitting 21 has, as mentioned above, over its entire length L a hole which is matched to the contact material profile and has a certain oversize. Contact 19 which is finally supplied to the electrode
The length of the stopper 23 is determined in advance. The length L of the lifting fitting 21, which in this embodiment is designed as a cutting fitting, is selected in such a way that the longest contact to be welded can be located therein.

The third curved segment of the curved retainer 5, which is now operatively engaged with the cam follower roll 15, rises and moves the retaining arm 1 with the electrode 2 and the lifting fitting 21 against the force of the welding pressure spring 16. Together, the contacts 19 are separated and individualized during the feed movement.
is raised until it is in line with the feed section 22 of the guide tunnel. At that time, the lifting metal fitting 21 moves through the stroke V (Fig. 2), so the hole 2
The lower edge of 11 is located within the sliding surface of the transfer fitting 18.

When the lifting fitting 21 reaches its upper end position, the hole 21 in the lifting fitting 21 is controlled by the envelope curve 7 via the feed lever 17.
1 and the transfer fitting 1 through the supply section 22
8 feed movement is started. During this movement, hole 2
The contact 19 located inside the holder 20
At the top, it is shifted to the position where the welding process is to be performed.

Contact 19 is in hole 2 of lifting fitting 21
Immediately after leaving the cam follower roll 15, the holding arm 1 and thus also the electrode 2 are moved together under the action of the welding pressure spring 16 via a third curved segment cooperating with the cam follower roll 15, and thus also the electrode 2. Approximately 0.1 between the bottom surface of
Descend to a position leaving a gap of mm. The individualized contacts 19 are displaced into this gap under the action of the transfer fitting 18.

It will be appreciated that due to the large transmission ratio of the vibrating holding arm 1, the lifting fitting 21 already occupies a position approximately 0.5 mm above its lower end position at this point. Due to the above-mentioned oversizing of the hole 211, a new feed stroke can already be started in this position.

During the return stroke of the transfer fitting 18 and during the feeding movement of the feeding slider 9, the electrode 2 is connected to the cam driven roll 1.
Due to the further lowering of the third curved segment in cooperation with 5, it is pressed onto the contact 19 with a pressure determined by the force of the welding pressure spring 16.
At this moment the welding process begins, during which the electrode 2
is still slightly lowered by the melting distance.

With a sufficiently high slit 212, the stage can also be used for the return stroke of the transfer fitting 18. As soon as the transfer fitting 18 exits the hole 211 again, a new working takt can begin.

Via the adjusting nut 26 on the connecting rod 27, which is rotatably supported in the housing 4, the welding pressure spring 16 is adjusted to the transmission ratio resulting from the various distances up to the rotation point 3, depending on the required welding pressure. can be set taking into account.

Holding body 20 that is carried out continuously during one takt
Since 1/3 of the total takt time is utilized for the transfer of the welded contacts 19, the new contacts are transferred to the electrode 2 only after the previously welded contacts have been further transferred one complete step. are in such a mutual position that they can be brought under.
Nevertheless, in this welding device, all movements of the device are carried out by means of the slitted lifting or cutting fitting 21, so that the entire movement of the device can be carried out in a production line operation such that approximately 800 takts are possible in a single welding time of 20 milliseconds. and can proceed in any desired temporal relationship.

The welding device described above can also be used advantageously if the lifting fitting 21 is supplied with contacts prefabricated to any desired profile. In this case, the lifting fittings are provided with loading holes oriented perpendicularly to the direction of movement of the transfer fitting 18, which are connected to externally guided individual contact loading channels. The reciprocating movement of the lifting fitting 21 always grips a single contact 19 and brings it into a position in line with the feed section 22, at which point the transfer fitting 18 then enters the hole 211 and the slit 212. Also in this case, the contact 19 is guided in the welding position completely reliably and in place during the entire stroke, so that the reliability of operation of the welding device can be maintained to the highest degree. If the lifting fitting 21 is connected to the loading channel for the individual contacts, the lifting fitting may be configured to serve as a cutting tool for separating the individual contacts from the contact material band.

The configuration of the welding device described above allows very simple modification to adapt to different contact geometries. The replaceable element set consisting of supply section 24, lifting fitting 21 and supply section 22 is easily accessible. It will be appreciated that by rotating the retaining arm 1 about the pivot pin 3 both supply sections can be completely freed. For modification, connect rod 27
It is only necessary to remove the pin that swingably supports the forked end of the case 4 and to remove the plate 25 that engages with the lifting fitting 22 in a claw-like manner. At that time, it is preferable that the biasing force of the welding pressure spring 16 be slightly weakened in advance.

Lifting fitting 2 from rotation point 3 of holding arm 1
1 is relatively large, it is not necessary for the lifting fitting 21 to be constructed with a cylindrical guide surface at the transition point to the feed section 22.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the welding device. FIG. 2 is a partial sectional view taken along the line - in FIG. 1... Holding arm, 2... Electrode, 3... Axis, 4...
Case, 5... Curved holder, 6... Pin, 7...
Curved track, 8-13... Feeding device, 14... Contact material, 15... Cam driven roll, 20...
Holding body, 21... Lifting metal fitting, 22... Supply section, 23... Stopper, 24... Supply section, 25... Claw plate, 26... Adjustment nut, 27... Connection rod, 211... Hole, 221
...Guidance slit.

Claims (1)

[Claims] 1. Welding device, in particular for welding shaped contacts onto a holding body, in which the individualized contacts pass through a correspondingly shaped guide tunnel with the welding electrode and the holding body. In a welding device that is offset between the body and the body, the guide tunnel has a first feed section 24 and a second feed section 22 that is offset in height relative thereto, with one Lifting fittings 21 are located, which lifting fittings each have a through hole 211 corresponding to the contact profile for one contact 19, and on the hole side a transfer fitting 18 which is offset in the direction of the electrode 2. Hole 21 for passing through
In addition, the transfer fitting 18 has a central slit 212 opening into the guide tunnel 2 for raising the contact 19 from the first feed section 24 to the level of the second feed section 22.
A welding device characterized in that it is movable in the lateral direction by a displacement of 4.22. 2. The welding device according to claim 1, characterized in that the shaped contact material 14 continuously fed through the first feeding section 24 by the lifting fitting 21 is separable. welding equipment. 3. In the welding device according to claim 1, individual contacts 19 arranged one after the other are supplied to the lifting fitting 21 through the first supply section 24 and are thereby individually separated into the second contact 19. A welding device characterized in that it is supplied to a supply section 22. 4. In the welding device according to any one of claims 1 to 3, the second supply section 22 is located alongside the first supply section 24 in the same direction and perpendicular thereto. A welding device characterized in that an individual contact loading channel is provided, which channel terminates laterally at a lifting fitting 21. 5. In the welding device according to any one of claims 1 to 4, the moving electrode is located on one swingable holding arm, and this holding arm 1 simultaneously holds the lifting fitting 21. A welding device characterized by serving as a holding body for a welding device. 6. The welding device according to claim 5, characterized in that the lifting metal fitting 21 is connected to the holding arm in a claw-like plate 25 by force connection while being isolated from the holding arm. 7. In the welding device according to claim 5 or 6, the transfer fitting 18 is movable into and through the slit 212 of the lifting fitting 21 independently of the position of the holding arm 1. A welding device characterized by: 8. The welding device according to any one of claims 1 to 7, characterized in that the transfer metal fitting 18 is controlled via one envelope curve 7. 9. In the welding device according to any one of claims 1 to 8, in order to drive the necessary holding arm 1 and material feed devices 8 to 13, the curves serve as return elements and springs, respectively. A welding device characterized in that 10, 13, and 16 serve as feeding elements. 10. Welding device according to claim 9, characterized in that the envelope curve 7 and the curve as the return element are arranged on a single holder 5. 11 In the welding device according to claim 9 or 10, all the springs 10, 13, 16
A welding device characterized in that each can be individually adjusted from the outside. 12 In the welding device according to any one of claims 9 to 11, the feeding devices 8 to 13
Welding device characterized in that it has one feed slide 9 which is actuated towards one replaceable stopper 23. 13. In the welding device according to any one of claims 1 to 12, the lifting fitting 21 and the first and second supply sections 22,
Welding device, characterized in that 24 form one replaceable element set. 14 In the welding device according to any one of claims 9 to 13, the feed spring 16 of the holding arm 1 is supported by one removable connecting rod 27, and this connecting rod is A welding device characterized in that a lifting metal fitting 21 is sandwiched in a bifurcated manner and is swingably placed on one removable pin 6.