JPS5838278B2 - Electric resistance seam welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pushing device with alternating operation for workpieces to be welded, in particular can bodies of cans, and a longitudinal guide device for a guide slide connected to a drive device. The present invention relates to an electric resistance seam welding device comprising a button and a pawl which is swingably mounted on the device and which is pivoted into a conveying range in the case of forward feeding and pivoted out of this region in the case of backward feeding.

A known welding device of the above-mentioned type (Swiss patent no. 51937
In the case of (Specification No. 1), the feed pawl is forcibly swung into the conveyance range by a control cam provided appropriately in the case of forward feed, and the second feed pawl is mounted at an appropriate location in the case of rear feed.
It is swung again by the cam and taken out.

This known device works very precisely and can also be used for large numbers of strokes.

To achieve this objective, great demands are placed on the machining accuracy of the individual parts.

This technical outlay is not justified due to the low performance and price range of various welding devices, especially in the case of packaging devices.

The object of the invention is to provide a pawl feeding device which can be manufactured at reasonable cost, works accurately and eliminates the deficiencies of known devices.

Another object of the present invention is that the feed pawl swings immediately from the conveyance range at the start of the rear feed so that a new board body (processed product) can be supplied to the conveyance range while the rear feed is already in progress. It's about getting out.

A further object of the invention is that the pawls are swung in immediately after the start of the forward feed, or that the pawls are swung out immediately after the start of the backward feed.

According to the invention, these objects are solved in that the pawl is swiveled in and out by means of a frictional force exerted by a longitudinal movement on the pawl.

The advantages of the invention lie in two main parts.

This new feed pawl is therefore simple in construction and therefore simple and advantageous to manufacture and requires almost no maintenance.

Another particularly important advantage is that the pivoting in and out of the pawls takes place at appropriate points along the guide track and whenever the guide slide changes its direction of movement.

Therefore, the point at which the pawl swings in and out can be changed at any time without requiring any engagement with the pawl device, and in the case of direction reversal, the position of the guide slide is independent from the reference point. .

The invention will be explained in detail with reference to the illustrated embodiments.

In buttons 1, 2 and 3, the guide slide 2 is supported by the longitudinal guide 1 so as to be movable in the longitudinal direction with reduced friction.

The pawl body 3 is supported in place of a pin 4 in a recess 9 of the guide slide 2.

Displaced radially with respect to the fulcrum (pin 4), the pawl body 3 is provided with a brake stage 5 cylindrical body 6 consisting of two parts, for example made of synthetic material.
is inserted into the hole 8 together with the spring 7, so that both cylinders 6
The guide portion 10 is pressed against both sides.

Instead of a crank drive, the guide slide 2 is reciprocated with the pawl 3 along the guide part 1 by means of a crank 12 via the connecting rod 10 and the crank rod 11 (FIG. 4).
Obviously, a double-acting pneumatic cylinder 13 or other linear drive means can also be provided (FIG. 5).

This feed claw works as follows.

In the case of forward feed (arrow A in FIG. 1), the pawl body 3 is moved by the cylinder 6 against the upper edge of the guide slide 2 due to the friction between the brake stages 5 (cylinders 6) in the longitudinal guide. It is swung as much as the pin 4 when it rests on the pin.

In case of direction reversal of guide slide 2 (arrow B in Fig. 2),
The pawl body 3 is instantaneously swung backwards as a result of the friction of the brake stage 5.

The claw body 3 is pivoted in and out regardless of the position of the longitudinal guide portion 1, and the release of the motion of the claw 3 is performed immediately when the guide slide 2 is reversed in each direction, and the direction is not reversed. Not performed in case of speed fluctuations.

The instantaneous and sufficient force acting on the pawl body 3 for instant and complete pivoting in and out is effected on the basis of the large adhesion frictional force of the friction body at the reversal point.

Since each position is maintained during the stroke movement (reciprocation), a fairly small amount of sliding frictional force is applied.

Therefore, friction or wear of the brake stage 5 is extremely low.

From FIG. 5, it can be seen that in the case of a reversal of direction, a reverse pivoting of the pawl body 3 takes place immediately, so that this pawl body can be slid back under a new workpiece 14, for example a tree body, which rests on the longitudinal guide 1. .

It is self-evident that the invention is not limited to the embodiments shown, for example, in FIGS. 1-3.

In particular, the braking force F can also be generated by other braking means.

The same applies to the structural embodiment of the longitudinal guide of the slide, which can be adapted to various circumstances according to the forces acting on the pawls.

In FIG.
Instead of the braking means in the form of a cylinder 6 (FIGS. 1-3) which is swingably gripped to the brake sleeve 20, the pawl 20 is connected by a pin 17 to a rail 18, which rail is connected to the brake sleeve 1.
9 so as to be movable in the vertical direction.

In the case of forward movement of the slide 15 (arrow C), the pawl 20 is swiveled in by the rail 18 which is braked in the sleeve 19.

In the case of a stroke in the opposite direction (arrow D), the pawl 20 is oscillated in the same manner.

As in the example shown in FIGS. 1-3, the pivoting in and out of the claw 20 is immediately performed at the point where the direction of the sliding body supporting the claw 20 is reversed.

By connecting the opposite sides of the pawls 200 with the rail 18, both pawls can be swiveled in and out at the same moment and accurately.

In this embodiment, it is possible to operate two or more claws simultaneously or individually.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view taken along the line I-I in Fig. 3 with the pawl of a guide slide having a pawl button and a guide track pivoted in, and Fig. 2 is a longitudinal sectional view of the pawl button and guide track. A vertical sectional view taken along the line I--I in Figure 3 with the claw of the guide slide swinging out, and Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 1. 4 and 5 are schematic front views of the feeding device, and FIG. 6 is a front view of the device having two claws. 1...Guidance section, 2...Guidance slide, 3,20...
- Claw (claw body), 4... Bottle, 5, 19... Braking means, 6... Cylinder body, F... Frictional force.

Claims (1)

[Claims] 1. A pushing device with alternating operation for a plurality of workpieces to be welded, in particular for can bodies of a plurality of cans, and a longitudinal guide button for a guide slide connected to a drive device and this device. In an electric resistance seam welding device, the claws 3, 20 are pivotably attached at the top and are provided with a claw that swings into the conveying range in the case of forward feeding and swings out from this range in the case of backward feeding. is applied to the claws 3, 20 by vertical movement, and is swung in or out by a frictional force F. 2. The force F is generated by a braking means 5 which is inserted into the pawl 3, is provided eccentrically with respect to the swing shaft 4, and slides against the guide device 1 with friction. Apparatus according to claim 1. 3 braking means 5,
19 is characterized in that it abuts against the guide device 1 with friction due to a spring force. Apparatus according to claim 2. 4. The spring force applied to the brake stages 5 and 19 is characterized in that the spring force applied to the brake stages 5 and 19 is configured so that the swinging of the pawl 3 and the swinging out or holding are performed immediately when the direction is reversed. Apparatus according to claim 3. 5. It is characterized in that the braking means 5, 19 are made of a material with good sliding properties. Apparatus according to claim 1. 6. Characterized in that the force F holds the pawls 3, 20 in position during the entire upward movement. An apparatus according to claim 1. 7. It is characterized in that the force F is exerted by the braking means 19 on the rail connecting the pawl 20. Apparatus according to claim 1. 8. As a result of the attachment friction of the braking means 5, 19, the force F that causes the 3, 20 to swing in and out is greater than the force F that is generated by the sliding friction and that holds the pawls 3, 20 in their respective positions. Device according to one of claims 1-h to 7, characterized in that: