DE20108153U1 - Edging table movable in the cutting direction and woodworking machine with one edging table - Google Patents

Description

PFISTER & PFISTER patent & attorneys at law

Dipl.-Ing. Helmut Pfister

Patent Attorney, European Patent & Trademark Attorney

Dipl.-Phys. Stefan Pfister

Patent Attorney, European Trademark Attorney

, Thorsten Koerl

'' ⁴ Lawyer

D-87700 Memmingen . Herrenstrasse 11-13

Telephone 0 83 31 / 24 12 Fax 0 83 31 / 24

D-87700 Memmingen . Buxacherstrasse 9

Telephone 0 83 31 / 6 51 83 Fax 0 83 31 / 6 51

Email info@pfister-pfister.de

HypoVereinsbank Memminaen (bank code 731 200 75) 2 303 Postgiroamt Munich (bank code 700 100 80) 13 43 39-805

VAT ID no. - VAT Reg.No. - N° CEE DE 182 193 017

15 May 2001

Otto Martin Maschinenbau GmbH & Co.
Langenberger Strasse 6

87724 Ottobeuren

"Edging table movable in cutting direction and woodworking machine with an edging table"

The invention relates to a trimming table which is movable in the cutting direction and has a cross table arranged thereon, in particular for a format saw and a woodworking machine with a trimming table.

A known example is a movable edging table on a panel saw, on which the workpiece is moved past the saw blade. To enlarge the edging table, a cross table is attached to it. This cross table is supported by an arm that is rotatably attached to the machine stand. Since the cross table is connected to the

·** _# ·* Erfi5llun|sortjuni| Serehtssteni'stjMernrningen ·

Telephone announcements are only binding after written confirmation

•t ···

When the edging table is moved, both the angle and the distance to the arm-cross table attachment point change when the edging table is moved - as seen from the arm-machine stand attachment axis. This is generally solved by combining the rotating arrangement of the arm to the machine stand and a simple telescopic design of the arm. However, this solution has its limits in terms of the maximum telescopic length. This then determines the range of motion of the cross table and thus also of the edging table. This also determines the maximum working length for the workpiece to be machined on the machine.

This problem is exacerbated when using a parallelogram cross table, which can adapt to the angular position of the workpiece to be machined in a parallelogram shape, because the required range of motion of the arm-cross table attachment point increases while the working length of the machine remains the same. This means that the range of motion is limited by the length of the arm.

It is also known to make the arm telescopic using a simple telescope. This increases the possible working length for the workpiece to be machined while the working length of the machine remains the same.

A trimming table with a cross table arranged on it is also known, which can also be a parallelogram cross table, in which a double joint is arranged between the arm supporting the cross table and the fastening axis. In this case, the range of motion and thus the possible working length for the workpiece to be machined is further increased by the length of the double joint.

However, it is also very often necessary to cut very large or long workpieces using the format saw described above.

In this case, the range of motion provided by the arm with telescopic part and the double joint is not sufficient for this task.

The object of the invention is therefore to provide a trimming table that is movable in the cutting direction or a woodworking machine with a trimming table, in which the range of motion available for the workpiece to be machined, which is provided by the arm to increase the working length, is significantly increased.

The invention is based on a trimming table that can be moved in the cutting direction and has a cross table attached to it for a panel saw according to the above-mentioned known prior art and proposes the features specified in independent claim 1 to solve the problem. Further developments or advantageous embodiments are the subject of the subclaims.

According to the invention, this object is achieved by installing at least one double telescope between the arm and the machine stand or another suitable attachment point on the machine or on the floor instead of the previously known single telescope. This enables the working length of the machine to be increased significantly without negatively affecting the overall length of the telescopic arm.

The double telescope is made up of an outer telescopic tube, an inner telescopic tube that can move linearly within it and a telescopic rod that can move linearly within this. The telescopic swivel arm designed as a double telescope thus consists of two single telescopes arranged one inside the other. The outer telescopic tube can be rotated around the fastening axis arm-machine stand or arm-attachment point on the ground or arm-other possible fastening point.

·

• · ♦ ·

The attachment point for the cross table is attached to the telescopic rod.

In a preferred further development of the invention it is provided that the arm and/or the inner and/or the outer telescopic tube has a further telescopic part.

This further development according to the invention makes it possible in principle to arrange any number of telescopic parts and thus to equip relatively very large trimming tables with a corresponding cross table. This results in a very wide range of applications for the invention. At the same time, it is also possible to design the arm from a more complex arrangement of several telescopic elements one behind the other in order to enable different kinematics, for example by using a joint arranged between them.

According to a further development of the solution according to the invention, the telescopic tubes and the telescopic rod are cylindrical, square, rectangular, plate-shaped or U-shaped. For the sake of simplicity, the description refers to telescopic tubes and telescopic rods. However, this is only an expression of the function, not the actual geometry of the parts. This is intended to express that the geometry of the parts of the telescope is not of essential importance for the function of the invention.

When the edging table is retracted to the stop position, the angle between the front surface of the stand and the arm is minimal. Both telescopes are fully extended. If the edging table is now moved in the cutting direction, the double telescope is retracted. This shortens the effective length of the arm. It is irrelevant which of the two telescopic parts arranged inside one another moves first or whether both move at the same time.

move at a time. In the position with the minimum effective length of the arm, the arm forms a right angle with the machine stand. The double telescope is then fully retracted. When the edging table is moved further in the cutting direction, the movement sequence takes place in the opposite way up to the outermost stop point.

In order to ensure that no vibrations occur during the movement of the trimming table due to one of the two telescopic parts reaching the end position, means are provided which are designed in such a way that these vibrations do not occur. This can be achieved, for example, by designing these means as end buffers.

Alternatively, this can also be achieved by a forced coupling of the two telescopic parts - for example by means of a cable gear. According to an advantageous development of the solution according to the invention, it is provided that in order to avoid contact between one of the inner telescopic parts and the machine stand, a roller is arranged on at least one or both of the inner telescopic parts in such a way that contact between one of the inner telescopic parts and the machine stand or the floor or the other support is excluded.

According to a further aspect of the invention, the cross table can also be designed in parallelogram form and arranged in an articulated manner on the trimming table.

According to a further development of the invention, it is

also possible to switch between the double telescopic swivel arm

and the fastening axis on the cross table a known double joint.

It has proven to be advantageous if this

- 6 double joint
is also designed to be telescopic.

The invention also relates to a woodworking machine, saw, in particular a format saw, with a trimming table according to one or more of the possible features described above for forming the trimming table.

The invention is described below with reference to drawings and exemplary embodiments. They show:

Fig. 1 a sectional view through the

double telescopic swivel arm, fully extended;

Fig. 2 is a sectional view according to Fig.

1 with fully retracted swivel arm;

Fig. 3 is a sectional view according to Fig.

1 and 2 with partially extended telescope and

Fig. 4 is a plan view of an inventive

Format saw in accordance with the requirements with trimming table and cross table to demonstrate the movement sequences.

Fig. 1 shows a sectional view of a double telescopic swivel arm, whereby the swivel arm is fully extended in this view. The arm 6 is formed by the outer telescopic tube 9, the inner telescopic tube 10 and the telescopic rod 11. The arm 6 is connected to the machine table 5 via the outer telescopic tube 9 and the rotation axis 7. Instead of being attached to the machine table 5, the outer

Telescopic tube 9 can also be connected to another suitable fastening axis, which can be located either on the floor or on another support. The reference number 8 designates the fastening axis of the telescopic rod 11 on the cross table 4. End buffers 12, 13 are arranged on the telescopic rod 11 or in the inner telescopic tube 10, which ensure that no vibrations occur when one and/or both of the telescopic parts, telescopic tube 10 and telescopic rod 11 of the arm 6, reach the end position. In the outer telescopic tube 9 of the arm 6 there is a roller 14, which is arranged in such a way that direct contact between one of the inner telescopic parts 10, 11 and the machine stand 5 or the floor or other support is excluded.

Fig. 2 shows a sectional view corresponding to Fig. 1, with the arm 6 in this figure being shown with the telescope fully retracted. The reference numerals used have already been introduced in Fig. 1, so that a repeated introduction is omitted.

Fig. 3 shows a sectional view of the telescopic arm according to the invention, with the telescope partially extended. The same reference numerals have been used here too, so that a repeated presentation is again omitted.

Fig. 4 shows a top view of a format saw according to the invention with a trimming table 2 and a cross table 4 to illustrate the movement sequences. The arrow 1 indicates the cutting direction. The arrow A indicates the direction of movement to reach the starting position and the arrow B indicates the direction of movement to reach the end position. From this illustration it can be seen that when the trimming table 2 is retracted into the stop position A (against the cutting direction), the angle between the front surface of the stand and the arm 6 is

minimal. The double telescope is fully extended. If the trimming table 2 is now moved in cutting direction 1, the double telescope or arm 6 with its parts outer telescopic tube 9, inner telescopic tube 10 and telescopic rod 11 is retracted into the outer telescopic tube 9. This shortens the effective length of the arm 6. It is irrelevant which of the two telescopic parts arranged one inside the other moves first or whether both move at the same time. In the position with the minimum effective length of the arm 6, the arm 6 forms a right angle with the machine stand 5. The double telescope or arm 6 is then fully retracted. This means that the inner telescopic tube 10 is then arranged in the outer telescopic tube 9 and the telescopic rod 11 is in this position in the inner telescopic tube 10. When the trimming table continues to move in cutting direction 1, the movement sequence takes place in the opposite way up to the outer stop point (direction of movement to reach the end position B). In this position too, the angle between the front surface of the stand and the arm is again minimal and both telescopes are fully extended. From the illustration in Fig. 4 it can also be seen that the cross table 4 is designed like a parallelogram. This embodiment requires that the cross table 4 is arranged in an articulated manner on the trimming table 2.

A further embodiment, not shown in the drawing here, relates to a trimming table 2 as shown in Figs. 1 to 4, but further developed in that a double joint is arranged between the double telescopic swivel arm or arm 6 and the fastening axis 7 or the fastening axis 8. This double joint can also be telescopic.

The claims filed now with the application and subsequently are attempts to formulate without prejudice to achieve more extensive protection.

* &bgr; «»· «it»

The references cited in the dependent claims indicate the further development of the subject matter of the main claim through the features of the respective subclaim. However, these are not to be understood as a waiver of the achievement of independent, objective protection for the features of the referenced subclaims.

Features that have so far only been disclosed in the description can be claimed in the course of the procedure as being of essential importance to the invention, for example to distinguish it from the prior art.

Claims (13)

1. Edging table ( 2 ) movable in the cutting direction ( 1 ) with a cross table ( 4 ) arranged thereon, in particular for a format saw, wherein the cross table ( 4 ) is supported by an arm ( 6 ), characterized in that the arm ( 6 ) is designed as a double telescopic swivel arm such that an inner telescopic tube ( 10 ) is linearly movable in the outer telescopic tube ( 9 ) and the telescopic rod ( 11 ) is arranged in this, also linearly movable. 2. Edging table according to claim 1, characterized in that the double telescopic arm ( 6 ) with the outer telescopic tube ( 9 ) is attached to the machine stand ( 5 ) or to the floor or another support so as to be rotatable about the fastening axis ( 7 ) and is connected to the cross table ( 4 ) with the telescopic rod ( 11 ) so as to be rotatable about the fastening axis ( 8 ). 3. Edging table according to one or both of the preceding claims, characterized in that the telescopic tubes ( 9 , 10 ) and the telescopic rod ( 11 ) are cylindrical or square or rectangular or plate-shaped or U-shaped. 4. Edging table according to one or more of the preceding claims, characterized in that means are provided which are designed such that no vibrations occur when one and/or both of the telescopic parts, telescopic tube ( 10 ) and telescopic rod ( 11 ) of the arm ( 6 ), reach the end position. 5. Edging table according to one or more of the preceding claims, characterized in that the means are designed as end buffers ( 12 , 13 ). 6. Edging table according to one or more of the preceding claims, characterized in that the means are provided by a forced coupling of the telescopic parts ( 9 , 10 , 11 ). 7. Edging table according to one or more of the preceding claims, characterized in that the positive coupling is produced by a cable drive. 8. Edging table according to one or more of the preceding claims, characterized in that at least one roller ( 14 ) is arranged on one or both of the inner telescopic parts, inner telescopic tube ( 10 ) and telescopic rod ( 11 ), in such a way that contact between one of the inner telescopic parts ( 10 , 11 ) and the machine stand ( 5 ) or the floor or another support is excluded. 9. Trimming table according to one or more of the preceding claims, characterized in that the cross table ( 4 ) is designed like a parallelogram and is articulated on the trimming table ( 2 ). 10. Edging table according to one or more of the preceding claims, characterized in that a double joint is arranged between the double telescopic swivel arm and the fastening axis ( 7 ) or the fastening axis ( 8 ). 11. Edging table according to one or more of the preceding claims, characterized in that the double joint is designed to be telescopic. 12. Edging table according to one or more of the preceding claims, characterized in that the arm and/or the inner and/or the outer telescopic tube has a further telescopic part. 13. Woodworking machine, saw, in particular format saw, with a trimming table ( 2 ) according to one or more of the preceding claims.