DE3447649A1 - Device for the flush cutting of edges such as, for example, ledges, veneer strips or the like - Google Patents

Abstract

In order to create a device for the flush cutting of edges such as, for example, ledges, veneer strips or the like which is also suitable for machines for craft businesses and enables as small a workpiece sequence as possible to be maintained, the stops (9, 10) which can be brought to bear on the front or the rear end face of the workpiece are in each case arranged on the free end of a lever, the other end of which is in each case pivotably applied to a slide (5) which is movable parallel to the path of movement of the workpiece (W) and carries the cutting tool (6). <IMAGE>

Description

PATENT AND LAWYERS

PATENTANWÄLTE DIPL.-ING. W. EITLE. DR. RER. NAT. K. HOFFMANN. DIPL.-ING. W. LEHN

DIPL.-INO. K. FOCHSLE DR. RER. NAT. B. HANSEN · DR. RER. NAT. HA. BRAUNS DIPL.-ING. K. GDRG

DIPL.-ING. K. KOHLMANN · LAWYER A. NETTE

-A-

Heinrich Brandt Maschinenbau GmbH 4 9 20 Lemgo

Device for flush cutting edges, such as strips, veneer strips or the like

The present invention relates to a device for flush cutting each over in the direction of movement front and rear face of a continuously moving plate-shaped workpiece protruding edges, such as strips, Veneer strips or the like, with one on the front and one on the rear face of the workpiece for contact bringable stop with a coupled with the stops, rotating cutting tool, for example a saw blade or the like, wherein the stop surface of the one stop with the one and the stop surface of the other stop is aligned with the other side of the cutting tool.

Devices of this type, i.e. those in which the cut is made on the front and rear face of the workpiece is carried out by a single unit with one and the same cutting tool, were at the beginning of the development such trimming units. For example, from DE-AS 12 61 655 a device is known in which the order one lying horizontally and transversely to the path of movement of the workpiece aligned axis rotating cutting tool with its circumferential surface performs the two cuts.

Also known is a device with a cutting tool in the form of a chop saw blade, the axis of which is horizontal and is aligned parallel to the trajectory and that in each case

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makes the two cuts with the front sides.

Both constructions have in common that the device is connected to a so-called parallelogram guide Pendulum arms is articulated, which requires a lot of space and, due to the design, compliance with relatively large distances between the workpieces to be machined, i.e. requires a relatively large workpiece sequence. Large workpiece sequences however, inevitably have a negative effect on machine performance.

To reduce the workpiece sequence and thus the machine performance to increase, devices have already been developed in which for the cut in the area of the front A first face and, for the cut in the area of the rear face, a second completely separate from it Unit is used with its own cutting tool and its own control. Both aggregates are respectively on parallel to the workpiece's throughput path, space-saving straight guides via pneumatically operated • cylinder drives moved back and forth, so that for the empty or Return strokes are only required for very short periods of time. Due to the double arrangement, the technical effort for such units, however, relatively high, so that such devices are only suitable for machines for processing of large series and not suitable for machines for craft businesses-

The object of the present invention is to provide a technically simple structure and therefore also for machines To create suitable devices for handicraft businesses that ensure the smallest possible workpiece sequence allows.

This object is achieved in that the

Stops are each arranged at the free end of a lever, the other end of which is parallel to the movement path of the workpiece movable, the cutting tool carrying carriage is pivotably articulated.

The invention is based on the idea of a device of the type described at the outset, i.e. one in which the cut on the front and the rear face of the workpiece from a single unit with one and the same cutting tool is carried out, in terms of the structure of the guide and the construction of the stop assembly to be completely redesigned. So according to the invention instead of a space-consuming and relatively sluggish working parallel program a space-saving running parallel to the movement path of the workpiece and relatively fast straight line guidance as well as a completely new stop system are used. With this one new stop system, the stops are each arranged at the end of a lever and can therefore be easily accessed by Pivoting the lever relatively quickly swiveled into the path of movement of the workpiece and attached to the respective associated The face of the workpiece can be brought to bear. This concept allows with relatively little technical Effort an exceptionally fast working method and thus a short workpiece sequence. Devices of the invention Art are therefore particularly suitable for machines for small series, i.e. for those that are primarily used in craft businesses can be used.

Basically, you can use the levers in each of the stops can be swiveled in and out at any level. A particularly advantageous embodiment with regard to the overall arrangement however, it arises when the pivot axis of the lever lies above the workpieces and runs approximately parallel to the workpiece plane. In such a configuration, the device lies essentially over the continuously moving plate

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shaped workpieces, with those at the ends of the levers arranged stops pivoted from above into the area of the front or rear end face of the workpiece will.

In principle, the levers can be designed in any way. One with regard to the technical structure However, a particularly advantageous embodiment is obtained when the levers are located opposite the stops in the area of their opposite End connected to one another and pivotably articulated on the slots about a common axis. In this way, a double-armed lever is used instead of single levers, with the stops on the free one Ends of the arms are arranged. Due to the design as a double-armed lever, only one is used for both stops Pivoting device is required because when one stop is pivoted into one stop position, the other Stop is automatically pivoted out of its stop position into its rest position due to the rigid coupling.

Various drives are suitable for pivoting the double-armed lever. However, it is particularly advantageous when the double-armed lever can be pivoted via a preferably pneumatically operated cylinder arrangement.

In principle, the cylinder arrangement can be designed in any desired manner. However, it is advantageous if the Cylinder arrangement comprises two cylinders which act at the same point of the double-armed lever and their axes of action include an acute angle with each other. In this way, the cylinders can be attached directly to the double-armed Attack levers without taking special precautions to overcome each Dead center must be met. As is known, it is possible to use actuating cylinders which act directly on a pivoting part realize only a limited swivel angle. If larger swivel angles are required, they are usually complex

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Lever arrangements or gears required.

To adjust the stops in the stop positions with respect to the cutting tool, it is advantageous to use special ones Provide stop systems. It is useful that the double-armed lever has two pivot stop surfaces and the carriage has two associated adjustable stop screws.

In order to use pneumatically operated cylinders with the lowest possible pressures and as small as possible To be able to manage cylinder dimensions, it is advantageous to define the double-armed lever in the a locking device must be provided for both stop positions. This ensures that the respective The stop is fixed and immovable even in the event of greater force or in the case of impacts and vibrations remains in its stop position. Dimensional deviations during the cutting process, chatter marks or the like can thus do not occur.

In principle, the locking device can be designed in any "arbitrary manner. It is only essential that that the double-armed lever is firmly locked in its stop position.

According to an advantageous development, there is a particularly simple and operationally reliable type of locking of the invention in that the locking device has at least one locking part which extends into the pivot path of the double-armed lever or an element that can be pivoted in, pushed in or with this element is retractable. This locking part can be operated in any desired manner. If necessary, the Actuation of its own working cylinder can be provided. However, it is particularly advantageous if the arrangement of the

art is taken that the already existing cylinder for pivoting the double-armed lever also the Locking part swivels into its locking position or retracts.

In a particularly preferred embodiment one with a double-armed lever and a cylinder arrangement comprising two cylinders is according to the invention the double-armed lever with a third lever arm firmly connected, the opposite of the two arms of the double-armed leverä at the same angle • is arranged. In this preferred construction, the locking part is designed as a locking plate, the one at a distance from the pivot axis of the double-armed Lever arranged and is pivotable parallel to this axis extending. The pivot axis of the locking plate, the point of application for the cylinder on the double-armed lever and the pivot axis for the double-armed lever Levers are in the middle position of the double-armed lever and one level. It is essential in this construction furthermore, that the two cylinders are mounted on the locking plate so as to be pivotable symmetrically to this plane are, the locking plate having two locking surfaces has / of which one is in the stop position of the double-armed lever when the locking plate is pivoted lies in the pivoting path of the third lever.

An embodiment of this type impresses with its technically simple and functionally reliable structure. So will created by the double-armed lever a kind of pendulum stop, the stops arranged at the ends of the arms can be brought into the respective stop position and thus into their functional position by simply pivoting the double-armed lever. For swiveling the

double-armed levers are of such a construction no complicated lever arrangements or swivel gears required. Rather, the two cylinders engage directly to the double-armed lever arm, with one cylinder due to the active axes arranged at an angle helps the other cylinder over the dead center position. In addition, there is no for the locking device own drive required. Rather, the cylinder pivoting the double-armed lever in each case pivots also the locking plate, which in this way rests against the third lever with one of its locking surfaces and thus a backward movement of the double-armed lever and thus the stop is blocked.

In the following, an exemplary embodiment is shown schematically for further explanation and better understanding Invention described in more detail with reference to the accompanying drawings.

Fig. 1 shows the device according to the invention when flush cutting one over in the direction of movement protruding front end face of a continuously moving plate-shaped workpiece Edge,

Fig. 2 shows the device according to Figure 1 after completion of the cutting process in a central position, in which the workpiece passes under the device, and

In a representation corresponding to FIG. 1, FIG. 3 shows the flush cutting of a in the direction of movement, the rear face of the continuously moving plate-shaped workpiece protruding edge.

Plate-shaped moving continuously via a conveyor 1 Workpiece W has left the gluing station, not shown in the drawing, in which an edge, such as For example, a bar or a veneer strip was glued to the side of the workpiece. After leaving The gluing station is known to have a section above the front or rear face S or S " or 3 of the edge in front. These preceding sections 2 and: should now be flush with the device according to the invention cut with the front and rear faces of the continuously moving plate-shaped workpiece W, i.e. be "cut off".

Above the workpiece W is one parallel to the pass-through path of the workpiece W aligned straight guide 4 arranged on which a carriage 5 via a not shown Piston-cylinder assembly is mounted to move back and forth. The carriage 5 carries on its the viewer facing away from a holder for a drive motor of a cutting unit. With the exception of the cutting tool, which in the present case has the shape of a circular saw blade 6 is of the cutting unit For the sake of clarity, nothing is shown in the drawings.

The cutting unit is mounted on the carriage 5 in such a way that its axis is parallel to the plane of the drawing horizontal saw blade 6 execute a reciprocating movement perpendicular to the plane of the drawing can.

A double-armed lever 8 is attached to the slide 5 about a pivot axis 7 running perpendicular to the plane of the drawing pivoted articulated. This double-armed lever 8 carries a stop 9 at its one free end and at its the other free end has a stop 10. As can be seen in particular from FIG. 2, the stop 9 has a stop surface 11 and the stop 10 is a stop surface

In the axis of symmetry of the double-armed lever 8 between the two stops 9 and 10 is at a distance from the pivot axis 7 a pivot pin 13 is mounted in the double-armed lever 8. The piston rods grip the pivot pin 13 14 and 15 of cylinders 16 and 17, whose axes of action 18 and 19 in the present embodiment are at an acute angle are arranged to each other. The cylinders 16 and 17 are rotatable on a locking plate 22 via pivot pins 20 and 21 mounted, which in turn by an angle bisecting in the middle position

that of the two effective axes 18 and 19 lying slightly above the pivot axis 23 arranged on the pivot pin 20 and 21 is pivotably mounted on the slide 5.

In the present embodiment, the arrangement is such that the intersection of the bisector of the two active axes 18 and 19 in the central position with the perpendicular to the active axes through the axis of the pivot pin 20 or 21 runs through the axis of the pivot axis 23 (see Fig. 2)

In the plane of the locking plate 22 is a lever arm behind the double-armed lever 8 and firmly connected to it 24 attached whose free end when pivoting the double-armed lever 8 also around an arc the pivot axis 7 describes. In the middle position according to FIG. 2, the axis of the lever arm 24 lies in the bisector between the effective axes 18 and 19.

In the area of its side facing the lever arm 24 the locking plate 22 has an approximately trapezoidal recess 25 on which locking surfaces 26 and 27 are attached connect.

"The length and the design of the lever arm 24 and the dimensions the trapezoidal recess 25 in the locking plate 22 including the shape of the locking surfaces 26 and 27 in relation to the pivot axis 23 is of this type selected that the lever arm 24 is freely in the trapezoidal recess when the double-armed lever 8 is pivoted 25 of the locking plate 22 can rotate and the locking surfaces 26 only then at the free end of the lever arm 24 come to rest when the double-armed lever 8 - as shown in Figures 1 and 3 - in its stop position.

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On the slide 5 adjustable stop screws 28 and 29 are also attached, on which the side surfaces of the lever arm 24 rest in the respective stop position (see. Fig. 1 and 3). If the protruding front section 2 or the protruding rear section 3 of the edge is now to be cut off flush with the front end face S ₁ or the rear end face S ", the device is moved into the stop position shown in FIG. 1 before the workpiece W is delivered brought. For this purpose, the cylinder 17 is acted upon, whereby the double-armed lever 8 is pivoted clockwise until the right side surface of the free end of the lever arm in the drawing rests on the head of the adjusting screw 28. In this position, the stop surface 11 of the stop 9 is aligned exactly flush with the face of the saw blade 6 that is downstream in the conveying direction of the workpiece. As soon as the lever 24 rests against the stop screw 28, the locking plate 22 is also pivoted clockwise about the pivot axis 23 due to the pressure effect of the cylinder 17 until it engages with its locking surface 26 with ^ ^em lever arm 24 and this is in its stop position on the Stop screw 28 locked.

Once this locking has taken place, the workpiece W strikes the _{stop surface 11 of the stop 9 with its front end face S 1} in the direction of passage and moves the stop 9 together with the carriage 5 on the linear guide 4 to the right in FIG. In the course of this displacement movement, the circular saw blade 6 is moved perpendicular to the plane of the drawing against the protruding front section 2 of the edge and this is cut off flush with "the front face" S.

Once this has been done, the circular saw blade 6 is withdrawn and the piston rod of the cylinder 16 extended somewhat, whereby the locking plate 22 Geger

pivots clockwise into the central position shown in FIG. As a result, the locking surface 26 lifts from the lever arm 28 so that the piston rod 15 of the cylinder can be retracted. The two-armed one swivels Lever 8 counterclockwise to the middle position shown in FIG.

In the middle position, the carriage 5 is moved on the linear guide 4 via an adjusting cylinder (not shown) pushed back to its original position on the left.

Has the carriage 5 reached its starting position and is the workpiece W with its rear end face S_ in the direction of movement approximately below the pivot axis 7 of the double-armed When the lever 8 is reached, the cylinder 16 is acted upon and the piston rod 14 is extended. By extending the piston rod 14 is the double-armed lever arm 8 against _ pivoted clockwise until the lever arm 24 with its left side surface in Figure 2 on the adjustable stop screw 29 strikes. As soon as this stop position is reached, the locking plate 22 is due to the pressure effect of the cylinder 16 also counterclockwise to the Pivot axis 23 pivoted until the locking surface comes to rest on the lever arm 24 and in this way in the already described type, the double-armed lever 8 locked in the other stop position shown in Figure 3.

The slide is then actuated via actuating means (not shown) the continuously moved to the right workpiece W tracked until the stop surface 12 of the stop 10 on the rear Front surface S "of the workpiece W rests. Once this has happened drives'. the circular saw blade 6 perpendicular to the plane of the drawing and separates the protruding rear section 3 flush with the rear end face S ″ of the workpiece W.

As soon as the circular saw blade 6 is swung out again, the cylinder 17 is acted upon, whereby the locking plate 22 is pivoted into the central position shown in FIG. Following this, the Piston rod 14 of cylinder 16 retracted, whereby the double-armed lever 8 clockwise also into the Middle position shown in Figure 2 is pivoted. In this position, the carriage can then move again shifted to the left into its starting position along the straight guide 4 and the stop 9 with its stop surface 11 for a new cut - as already described at the beginning - can be swiveled in.

Claims (10)

HOFFMANN · EITLE & PARTNER PATENTANWÄLTE DIPL.-ING. W. EITLE DR. RER. NAT. K. HOFFMANN DIPL.-ING. W. LEHN OIPL.-INQ. K. FOCHSLE. DR. RER. NAT. B. HANSEN. DR. RER. NAT. HA. BROWN. DIPL.-ING. K. GORG DIPL.-ING. K. KOHLMANN · LAWYER A. NETTE Heinrich Brandt Maschinenbau GmbH 4 920 Lemgo Device for flush cutting edges, such as strips, veneer strips or similar claims 1. Device for flush cutting each over the front and rear face of a continuously moving plate-shaped workpiece protruding in the direction of movement Edges, such as strips, veneer strips or the like, with one stop that can be brought to bear on the front and one on the rear end face of the workpiece, and one with it the stops coupled, rotating cutting tool, for example a saw blade or the like, wherein the Stop surface of one stop with one side and the stop surface of the other stop with the other side of the cutting tool is aligned, marked thereby e t that the stops (9,10) are each arranged at the free end of a lever, the other end of which is in each case one that can be moved parallel to the path of movement of the workpiece (W), the slide (5) carrying the cutting tool (6) is pivotably articulated. 2. Apparatus according to claim 1, characterized geke η η ζ e I net that the pivot axis (7) of the lever runs parallel to the workpiece plane and is above the top of the workpieces (W). 3. Apparatus according to claim 1 or 2, characterized g e kenn show that the levers to form a double-armed lever (8) in the area of their stops (9,10) connected to each other at the opposite end and pivotable about a common axis (7) on the carriage (5) are hinged. 4th Device according to claim 3, characterized in that the double-armed lever (8) has a Cylinder assembly is pivotable. 5. Device according to Claim 4, characterized in that the cylinder arrangement has two cylinders (16,17), which in the same place of the double-armed Attack lever (8) and their working axes (18,19) one Include acute angles with each other. 6. Apparatus according to claim 3, characterized in that for adjusting the stops (9,10) opposite the cutting tool (6) in the stop positions..the double-armed lever (8) two swivel stop surfaces and the carriage has two associated adjustable stop screws (28,29). 7. Apparatus according to claim 3 to 6, characterized in that the definition of the double-armed Lever (8) a locking device is provided in the two stop positions. 8. Apparatus according to claim 7, 'characterized in that the locking device at least has a locking part which can be pivoted into the pivoting path of the double-armed lever (8) or one that can be pivoted therewith Element can be swiveled in or retracted. 9. Apparatus according to claim 3 to 8, characterized in that the locking part over the cylinder arrangement can be swiveled in or retracted. 10. The device according to claim 3 to 9, with a double-armed lever (8) and a two cylinder (16, 17) comprehensive cylinder assembly, characterized in that the double-armed lever with a third lever arm (24) is firmly connected to the opposite of the two arms of the double-armed lever at the same angular distance is arranged that the locking part is designed as a locking plate (22) which is around an im Distance to the pivot axis (7) of the double-armed lever (8) arranged and parallel to this pivot axis (23) is pivotable, the pivot axis (23) of the locking plate (22) being the point of application for the cylinder (16,17) on the double-armed lever (8) and the pivot axis (7) for the double-armed lever in the middle position of the double-armed Lever (Figure 2) lie in one plane, and that the two cylinders (16, 17) can be pivoted symmetrically to this plane are attached to the locking plate (22), the locking plate having two locking surfaces (26,27) has, of which one in the stop position (Figures 1 and 3) of the double-armed lever when the locking plate is pivoted lies in the pivoting path of the third lever arm (24). Copy