DE3046381C2 - Method and device for the production of friezes and lamellas for lamellar doors - Google Patents

Abstract

1. Method for manufacturing friezes and slats for slatted doors, characterized by a) providing a wooden board (1), whose breadth h approximately corresponds to a multiple of the thickness h1 of the frieze to be manufactured plus the wastes of timber and whose thickness d corresponds to the breadth of the frieze, b) sawing said wooden board (1) in its longitudinal direction into several raw pieces (2) having a rectangular cross-section and the predetermined cross-section of the frieze, c) machining the high-quality raw pieces (2) into friezes, d) further machining the low-quality raw pieces (2) each into several slats (3) by severing the raw pieces (2) in their longitudinal direction.

Description

2. A method for producing lamellas, in particular for lamellar doors, from a blank:> produced in particular with a method according to claim I, the thickness of which h \ approximately the width of the lamellas to be produced and whose width d approximately a multiple of the thickness d \ of the to be produced Lamellas plus the cutting widths, «1 marked by

a) Profiling the blank (2) on two opposite sides, to the cross-sectional area and to the Side surface vertical long sides in such a way, r, that these are equidistantly opposite in pairs and have grooves (4,4 ') running parallel to the longitudinal axis of the blank (2), their groove flanks according to the desired shape of the narrow side of the lamellas (3) are trained, and

b) cutting the blank (2) by means of a cutting tool (10, 11, 12) through cuts in Longitudinal direction along the grooves (4,4 ').

3. The method according to claim 2, characterized in that the profiling and cutting of the blank (2) takes place in a single machine run of the blank (2) in a single device which has a feed device (7, T) for the v \ blank (2) , a grooving device (8; 9) and a cutting tool (10; 11,12).

4. The method according to any one of claims 2 or 3, characterized in that the cutting depth Λ2 to be cut by means of the cutting tool (10; 11, 12) between opposing grooves (4, 4 ') is more than 15% smaller than the thickness h \ of the blank (2).

5. The method according to any one of claims 2 to 4, characterized in that the groove flanks are rounded are.

6. The method according to any one of claims 2 to 5, characterized in that in a known manner the cutting of the blank (2) in the longitudinal direction in each case by cuts from both sides along the opposite grooves (4, 4 ') takes place up to approximately its central plane (13).

7. The method according to any one of claims 2 to 6,

characterized in that the cutting thickness when cutting the blank (2 ) corresponds in each case to the width b of the grooves (4, 4 ')

8. The method according to any one of claims 1 to 7, characterized in that the surface of the Lamellae (3) is then smoothed by grinding.

9. Device for producing wooden lamellas (.3) from a blank (2) with a method according to one of claims 2 to 7, with

a) a feed device (7, T) for the clamped blank (2),

b) a milling or cooling device with two milling heads (8, 9) and with

c) a multi-blade saw bushing (10) or multi-blade circular saw (11, 12) as a cutting tool,

characterized,

d) that the milling heads (8, 9) are designed in such a way that when the blank (2) is fed by the feed device (7, 7 ') on the two opposite longitudinal sides of the blank (2) each pair of opposite, equidistant grooves ( 4, 4 '), the spacing of which corresponds to the width d \ of the lamellas (3) to be produced, and

e) that the blade thickness of the cutting tool (10, 11, 12) corresponds to the width b of the grooves (4, 4 ') and the blades are arranged in such a way that when the blank (2) is advanced by the advance device (7, 7 ') engage in the grooves (4, 4') and separate the blank (2) along the grooves (4, 4 ') into several lamellas (3).

10. The device according to claim 9, characterized by two multi-blade saw bushes (10) or multi-blade circular saws (11, 12) which are arranged offset in a known manner in the feed direction (X) and their blades in the grooves formed on opposite longitudinal sides (4, 4 ') so intervene so that each of the two multi-blade saw bushes (10) or multi-blade circular saws (H, 12) cuts through about half of the cutting depth h _{2 required to separate the blanks (2).}

The invention relates to a method and a device for producing friezes (frames) and Slats for louvre doors.

In conventional processes for producing friezes or lamellas for lamella doors, friezes are used and slats each made from different, commercially available wooden boards. As a criterion for the The choice of which boards are processed into friezes or lamellas depends on the quality of the wood, In particular, the presence of knotholes plays a major role. Higher quality wooden boards are processed into friezes, the other boards, with more knotholes, into lamellas.

The boards selected for the production of lamellas are first, e.g. B. with the help of multi-blade circular saws, Sawn into strips with a rectangular cross-section. Those that meet the quality requirements

Moldings are then subjected to further processing and surface treatment to create lamellas to produce the desired cross-sectional shape. This processing can, for. B. in a moulder done with the strips planed, trained and attached their narrow sides have to be rounded in order to be used as slats for louvre doors.

These conventional methods have several disadvantages. Since at the beginning of the procedure, After examining the whole boards, Jen made the decision to turn the boards into friezes and which are to be processed into lamellas, such parts of boards inevitably become too Processed lamellas that would be suitable for making friezes. It is thus more valuable, that is, using more expensive wood for a purpose that cheaper wood would also be suitable for. Also fall large amounts of waste of expensive wood, because the thinner the waste, the higher the waste are to be produced wooden parts, so it is z. B. proportionally higher for slats than for friezes. But it is also the total amount of waste is very large, since with conventional methods the boards are always along their entire thickness must be sawed through. As thicker saw blades are used for greater depths of cut have to be in order to prevent "bleeding" of the cuts, the larger the waste, the higher the waste Depths of cut are.

Another large amount of material used in conventional processes is when planing, the is carried out, for example, by planer shafts with a removal of 0.8 mm, which is the case with a thickness of Slats of just a few mm are particularly significant. In addition, with the conventional Process requires a multitude of operations. This not only increases the manufacturing costs; Through the various clamping and unclamping processes or the repeated feeding, the Quality of the lamellas produced, in particular with regard to their dimensional accuracy, adversely affected.

In contrast, the invention is based on the object of a method for producing friezes and to provide lamellas for lamellar doors, with which the wood suitable for friezes or lamellas is better can be selected than with conventional methods and louvre doors made of commercially available wooden boards can be manufactured with low material consumption and high quality.

This object is achieved by the features of claim 1. The invention is based on that Basic ideas from the blanks produced by sawing a standard wooden board depending on their Select wood quality and process it into friezes or lamellas.

The fact that in the process according to the invention the commercially available wooden boards first become blanks sawn up and only then with regard to their further use and processing into friezes or If slats are selected, it is ensured that only the wooden parts suitable as friezes are used as friezes processed, while all wooden parts of lower quality are processed into lamellas. It surrenders thus a lower material consumption with a simultaneous increase in quality.

While the blanks suitable as friezes only have to be subjected to a surface treatment, the other blanks are each further processed into a plurality of lamellas using a method according to claim 2. The lamellae are produced from a blank in a multiple process by profiling and then cutting or separating the blank; The previous ^r > profiling shortens the required cutting depth, so that a smaller saw blade thickness is sufficient and thus a smaller saw blade thickness is sufficient and thus less waste is incurred , there is no need for a machining process that is required for conventional lamellar production.
Particularly advantageous, time and cost saving and

> ~> Profiling and cutting of the blank is done with high quality in just one work step without unclamping of the blank in a single device, which in addition to a feed device for the blank a Milling or grooving device for profiling the

^J "blank in the manner described above and a separating device.

This eliminates the need for repeated feeding, which is necessary with separate profiling and cutting devices of the blank. This also results in a high and

^J 'constant quality of the lamellas with regard to their dimensional tolerances, since the profiling and cutting devices can be set (adjusted) with virtually any precision and constant over time relative to one another, so that the cutting tool always engages precisely in the profile grooves produced by the profiling device. If a multi-blade saw bushing or multi-blade circular saw is used as the cutting device, the blade thicknesses of which correspond to the width of the profile grooves, the lamellas can be reworked (smoothed) after

In the ¹ cutting process, only grinding is required, e.g. with 0.2 mm material removal, and planing, which leads to excessive material scrap, can be dispensed with; this further reduces material consumption.

Since in the method according to the invention, in contrast to conventional methods, the separation of the Blanks in lamellas only takes place after profiling, namely along the profile grooves, the shortened required depth of cut, preferably by more than 15%, and the smaller possible ones

⁴ "> saw blade thicknesses also result in less scrap. Even further material savings can be achieved by cutting the blank by making cuts from both sides in one of the two produced during profiling

^{"L (l} rows of grooves is performed. By this measure the egg ford variable depth of cut per blade can be approximately halved, the sheet thickness, and thus the waste can be thus further reduced. Preferably, the sheet er.tsprechen starches used in each case to the width of

"Grooves.

A particularly suitable device for carrying out the manufacturing method according to the invention of wooden lamellas from a blank has a feed device with precise guidance of the blank

^{1 (1} lings, a milling or fluting device for forming the longitudinal grooves of the blank in the manner described above and as a cutting tool a multi-blade saw bushing or multi-blade circular saw with blade thicknesses corresponding to the width of the slots

"Profiling of the blank are to avoid the otherwise necessary unclamping and turning of the blank avoid two milling heads provided that are identically shaped and each have the longitudinal grooves on one of the

form both long sides of the blank. With this device, a blank with the above described method in one operation, d. H. a single machine run, to several Lamellae are processed, with reduced time and time compared to conventional methods Material expenditure and with consistently high quality. Preferably, two in Use multi-blade circular saws or multi-blade saw bushings arranged in an offset manner in the feed direction of the blank det, which cut through about half of the required depth of cut each time, reducing the thickness of the blade and Waste can be reduced, as is known from DE-OS 24 04 513.

The invention is explained in more detail below with reference to the drawing. It shows

Fig. 1 shows the cross section of a customary wooden board from which with the method according to the invention Friezes and lamellas for louvre doors are made _> <>

F i g. 2 shows a perspective sketch of a blank used for the production of lamellas,

F i g. 3 shows a schematic elevation of a device according to the invention for producing wooden lamellas from a blank and Ji

4 shows a section along the plane IV-IV of Fig. 3.

The thickness d, preferably about 52 mm, of that shown in FIG. 1 commercial wooden board 1 shown corresponds to the width of the friezes to be produced. In order to keep material consumption as low as possible, its width h corresponds to a multiple of the thickness h \ (preferably about 32 mm) of the friezes to be produced plus the width of the waste sawed up. The cutting planes are shown in FIG. 1 indicated by dashed lines. The cross-section of the blank 2 given by the width c / and the thickness h \ corresponds to that of a frieze to be produced plus the material removed during a possible subsequent surface treatment; its length / should preferably correspond to a multiple of the length A of a finished frieze.

After sawing the board 1 into several blanks 2, depending on the wood quality of the individual 4 -, Blanks 2 a selection can be made, which of the blanks 2 to friezes and which to lamellas processed, because then the broad side of the frieze becomes visible. It is thus, in contrast to the conventional method in which this selection> o must be made on the basis of the whole boards 1, ensures that aiie suitable Hoizteiie to friezes processed and the entire material consumption is kept as low as possible. Processing the suitable blanks 2 for friezes then takes place in 5ϊ usual way.

The further processing according to the invention of a blank 2 which is not suitable as a frieze into a plurality of lamellas 3 is shown in FIG. 2 shown. The thickness h \ of the blank 2 corresponds approximately to the width of the lamellas 3 to be produced, its width d, in order to achieve optimal material utilization, a multiple of the thickness d \ of a lamella 3 plus the width of the waste. The length I] of the blank 2, normally the same size as the length / of the wooden board, preferably corresponds to the length of a finished lamella 3 or a multiple of this length.

The blank 2 is initially by means of a milling or Moulder with at least one suitable shaped milling head on two opposite, for Cross-sectional area and longitudinal sides perpendicular to the side surface are profiled in such a way that these are in pairs have opposing, equidistant grooves 4, 4 'running parallel to the longitudinal axis of the blank 2.

This profiling is shown in FIG. 2 illustrated by dashed lines.

The subsequent separation of the blank 2 into a plurality of lamellae 3 takes place by means of cuts in the longitudinal direction along the grooves 4, 4 ′, the cutting planes being indicated in FIG. 2 by dash-dotted lines 6.

The depth of cut h ₂ between opposing grooves 4, 4 'is smaller than the thickness h of the blank 2 due to the previous profiling of the blank 2. With a thickness h = 32 mm, n _{2 is} approximately 26 with a groove depth of 3 mm mm and can be reduced to about 20 mm with appropriately shaped milling heads. Since thinner saw blades can be used for this reason, the amount of waste that occurs is also reduced. The saw blade thickness preferably corresponds in each case to the width b of the grooves 4, 4 ', and the cut is made so precisely along the grooves 4, 4' that burr formation is avoided. Since the profile 5 formed between the grooves 4, 4 'or the respective groove flank is reproduced by appropriate selection of the milling heads of the desired shape of the narrow side of the lamellae 3, for example rounded or semicircular in cross-section, the through the cutting process produced lamellae 3 only required grinding. The grinding can be done with a removal of about 0.2 mm and with a high feed rate, while the slower planing which is necessary with conventional methods and which causes a larger removal can be dispensed with. If the longitudinal / ι of the blank 2 is a multiple of the length of a finished lamella 3 to be produced, the parts formed in the longitudinal direction by the separating process must be cut to the desired lamella length by sawing for the production of the lamellae 3.

In Figure 3, the front view of a device according to the invention for producing lamellae 3 from a blank 2 is shown in schematic form. A feed device with rollers 7, 7 'moves the blank 2 in the direction of the arrow X. It is also possible to use only one or more than two, for example, laterally arranged rollers as a drive, as well as other rollers that enable precise guidance of the blank 2 during the production of the lamellae F i g. 3 devices (rulers) not shown may be provided. In Fig.3 there are two milling heads S and 9 for profiling the blank. 2 shown on two longitudinal sides in the manner described above. If only one milling head 8 or 9 is used, the blank 2 must be rotated by 180 ° after profiling one long side and is then profiled on the other long side. Preferably, however, the profiling of both longitudinal sides takes place simultaneously by the two milling heads 8, 9 which process the upper and lower longitudinal sides and which can also be arranged offset in the feed direction of the blank 2. If two milling heads 8, 9 are used, their correct setting relative to one another reliably ensures that the equidistant grooves 4, 4 ', which run parallel to the longitudinal axis of the blank 2, are exactly opposite each other in pairs.

To separate the blanks 2 is either only one

single multi-blade saw bushing 10 or two multi-blade circular saws 11 and 12 engaging in the upper and lower grooves 4, 4 ', respectively, are provided. When using two multi-blade circular saws 11 and 12, each saw only has to cut the depth of cut from the respective groove 4, 4 'to the central plane 13, i.e. only about half of the total depth of cut hj. Therefore, if two multi-blade circular saws U and 12 are provided, thinner saw blades that cause less waste can be used.

The blank 2 is in the entire device according to the invention both before and after passing through the Milling heads 8, 9 out so precisely that for reworking

the produced lamellas 3, in addition to the possibly necessary sawing to the desired length, all that is required is smoothing the surface by grinding, whether one or two Cutting tools 10; 11, 12 are used.

The in F i g. 4 shown partial section in the plane IV-IV of F i g. 3 shows an embodiment of the milling heads 8, 9, which is suitable for forming flat side surfaces of the slats 3 with rounded edges. It however, any other, the narrow sides of the lamellae 3 during the profiling process in the desired way forming shape of the milling heads 8, 9 are provided.

For this purpose 2 sheets of drawings

Claims (1)

30 46 38L claims: 1. Process for the production of friezes and lamellas for lamellar doors, marked -, by a) Providing a wooden board (1), the width Λ of which corresponds approximately to a multiple of the thickness h, of the friezes to be produced plus the Ver m cutting widths and whose thickness c / corresponds to the width of the friezes, b) Sawing this wooden board (1) in the longitudinal direction into several rectangular cross-sections Blanks (2) with the specified cross-section, cut the frieze, c) Processing of the blanks (2) of higher quality into friezes, d) Further processing of the blanks (2) of lower quality to sometimes several lamellas (3) 2 » by severing the blanks (2) in the longitudinal direction.