[0001] The present invention relates to providing ground teeth on an elongate blade, which
blade may be virtually non-deformable, but in particular is a flexible strip, for
example made of strip steel. The present invention relates in particular to the production
of cutting blades from strip steel, which cutting blades are used in machines for
cutting bread and similar products. As is known, there are two basic designs of bread-cutting
machines, one design having one or more cutting-blade frames with a plurality of parallel
cutting blades in each frame, and the other design having at least one pair of parallel
rollers with a plurality of loop-shaped cutting blades around them. Examples of cutting
blades of this kind and their production are described in US 3 745 869, US 3 859 762,
US 4 119 004.
[0002] In the grinding apparatus of US-A-3 859 762 a blade is advanced by controlled increments
and brought against first one and then the other of a pair of grinding wheels which
are configured to impart a cutting edge configuration on the blade.
[0003] The object of the present invention is to provide a device for producing toothed
blades which has a very high production capacity and requires minimum deployment of
production staff. Furthermore, the present invention aims to provide a device which
optimizes the service life of the expensive grinding wheels, which brings the further
advantage that the device seldom has to be shut down for the purpose of exchanging
or maintaining the grinding wheels.
[0004] The present invention achieves the abovementioned objects by providing a device according
to claim 1.
[0005] Further advantageous embodiments of the device according to the invention are described
in the subclaims and the following description given with reference to the drawing,
in which:
Fig. 1 shows a diagrammatic plan view of the layout of an installation for the production
of cutting blades with ground teeth from strip steel, which installation comprises
a preferred embodiment of the device according to the invention,
Fig. 2 diagrammatically shows a view from above, partially in horizontal section,
of a preferred embodiment of the grinding device of Fig. 1,
Fig. 3 shows a diagrammatic, perspective view of the second grinding unit of the grinding
device shown in Fig. 2,
Fig. 4 shows a diagrammatic front view, in the direction of arrow IV in Fig. 2, of
the second grinding unit of Fig. 2,
Fig. 5 diagrammatically shows a detail of the view shown in Fig. 4, on a larger scale,
Figs. 6a, 6b show a side view of the strip steel, respectively after blanking and
after grinding,
Fig. 7 shows a cross-section through a grinding wheel of the grinding device shown
in Fig. 2,
Fig. 8 shows a plan view of part of a variant of the grinding device shown in Fig.
2, and
Fig. 9 shows a diagrammatic, perspective view of the conveyor station of the installation
shown in Fig. 1.
[0006] The installation shown in Figure 1 is designed for the production of toothed cutting
blades by providing ground teeth on strip steel. Cutting blades of this kind are intended
in particular for bread-cutting machines, but obviously may also be used for cutting
other products.
[0007] The installation shown in Figure 1 comprises an unwinding station 1 for strip-steel
coils delivered by the strip-steel producer. In this example, the strip steel which
is to be machined has a uniform rectangular cross-section with two parallel sides
which are situated a short thickness apart and a top edge and bottom edge, in which
case the strip steel will be machined in the region of the top edge for the purpose
of providing teeth. By way of example, the strip steel has a thickness which lies
between 0.25 and 0.5 millimetre and a height which lies between 9.6 and 12.7 millimetres.
The thin strip steel is flexible and is of a steel grade which is suitable for cutting
blades. Preferably, the strip steel supplied is already hardened, so that after the
cutting teeth have been provided the strip steel does not have to undergo any further
hardening treatment.
[0008] With the aid of the unwinding station 1, a plurality of coils of strip steel are
unwound and wound on to a single, large stock coil in storage station 2a, the ends
of the pieces of strip steel which are to be wound up in succession being welded together
using a movable butt-welding device 3.
[0009] The installation preferably comprises a plurality of storage stations which are displaceable,
so that, as can be seen in Figure 1, one of the storage stations 2a can be used to
wind up a new stock of strip steel, while another storage station 2b at the same instant
is feeding strip steel to that part of the installation which machines the strip steel.
[0010] The strip steel which is supplied by the storage station 2b and throughout the entire
installation stands with its side vertically upright passes into an accumulation and
tensioning device 4. The accumulation section of the device 4 has the task of allowing
the coil in the storage station 2b to be unwound uniformly, while the strip steel
further on is conveyed in a stepwise manner, as will be explained below. The tensioning
section has the task of maintaining a suitable tensile stress in that part of the
strip steel which is to be machined. For the abovementioned dimensions of the strip
steel, this tensile stress is approximately 500 N.
[0011] A blanking tool 5, which is designed to punch out part of the blade material which
is to be removed for the provision of the teeth is disposed downstream of the accumulation
and tensioning device 4 and upstream of the at least one grinding unit which is yet
to be described. The blanking device 5 has a blanking die on one side of the path
for the strip steel and, on the opposite side, a blanking tool which can move to and
fro in the horizontal direction transversely to the strip steel and with which the
basic shape of the teeth to be produced can be blanked from that area of the strip
steel which adjoins the top edge.
[0012] The basic shape (cf. Fig. 6a) of the teeth, which is obtained by blanking, is ground
on both sides of the strip steel by means of a grinding device 6, which will be described
in detail below with reference to Figures 2-7.
[0013] An inspection station 7 for the visual inspection of the ground teeth is disposed
downstream of the grinding device 6. The inspection station 7 comprises a suitable
lamp and a magnifier.
[0014] To convey the strip steel in steps along the path through the blanking device 5 and
the grinding device 6, a conveyor station 7 is provided, having conveyor means which
are to be described in more detail with reference to Figure 9.
[0015] The installation is suitable, inter alia, for the production of elongate cutting
blades of a certain length which - in contrast to loop-shaped cutting blades - are
moved to and fro in a cutting machine substantially in their longitudinal direction,
at right angles to the product which is to be cut. These cutting blades are usually
disposed substantially vertically in the cutting machine. To produce reciprocating
cutting blades of this kind, a hole-punching station 9 is provided, which is disposed
downstream of the conveyor station 8 and is designed to make a hole in the strip steel
in the region of each of the ends of a cutting blade which is to be produced.
[0016] Downstream of the hole-punching station 9, there is another accumulation station
10, in which a stock length of the machined strip steel can be accommodated.
[0017] A cutting station 11 for cutting the separate cutting blades to the desired length
is disposed downstream of the accumulation station 10. The cutting blades which have
been cut to length are collected in groups of the desired number in a collection station
12.
[0018] The installation described is also suitable for the production of strip steel which
is provided with teeth and is used as starting material for the production of loop-shaped
cutting blades. For this purpose, a winding station 13, which is able to wind the
machined strip steel on to a coil, is provided at the end of the installation.
[0019] Further operations, such as arranging attachment lugs in the holes in the strip steel
and providing logos and type designations on the strip steel, may be carried out on
the strip steel in the section indicated by dashed lines between the accumulation
station 10 and the cutting device 11.
[0020] Furthermore, Figure 1 also shows a filtering and cooling device 14 for the oil, which
oil cools and lubricates the grinding device 6 and is recycled through the device
14. Furthermore, boxes 16 for the control electronics and an operating panel 17 are
shown.
[0021] Figure 2 shows a diagrammatic plan view of the grinding device 6. The strip steel
is shown as the thick line which is advanced in the direction of the arrow P and is
denoted by the reference number 19. The grinding device 6 comprises:
- a frame 20 which is positioned on the ground and in this figure is indicated diagrammatically
by a rectangle,
- a first grinding unit 21 for carrying out a grinding operation on one side of the
strip steel 19, and
- a second grinding unit 41 for carrying out a grinding operation on the other side
of the strip steel 19.
[0022] With regard to their structure and operation, the first and second grinding units
21, 41 are substantially identical and, for this reason, will be explained in particular
with reference to the second grinding unit 41.
[0023] The grinding device 6 comprises support means for the strip steel, which in this
embodiment are realized in the form of rotatable support wheels. The support means
comprise a first support wheel 62, which supports the strip steel 19 at a first machining
position A, where the first grinding unit 21 machines the strip steel 19, and a second
support wheel 72 for the strip steel at a second support position B, where the second
grinding unit 41 machines the strip steel 19.
[0024] The grinding device 6 comprises strip-steel guidance means which define a path for
the strip steel 19 between the first support wheel 62 and the second support wheel
72. The strip-steel guidance means are designed to adapt the length of the path in
such a manner that the first and second grinding units 21, 41 can machine the strip
steel 19 simultaneously. The grinding device 6 will now be explained in more detail,
also with reference to Figures 3, 4 and 5.
[0025] The first and second grinding units 21, 41 each comprise a bearing support, 23, 43,
respectively, which is fixed to the frame 20 of the grinding device 6 and has a horizontal
bearing shaft 25, 45, respectively, which is mounted rotatably and without axial play
therein via high-quality bearings 24, 44, respectively. Each bearing shaft 25, 45
has a substantial thickness, in order to counteract undesirable deformation. A disc-like
carrier 26, 46 is arranged at one end of each bearing shaft 25, 45, with a plurality
of, in this example six, attachment locations distributed regularly around its circumference
and at an equal, fixed distance from the axis of rotation of the associated bearing
shaft 25, 45; each of these attachment locations holds a high-speed grinding-wheel
motor 27, 47, which is driven electrically or pneumatically, for example, and has
a rotating grinding-wheel axle 28, 48, respectively. A separate drive 29, 49 is provided
for driving each bearing shaft 25, 45 in rotation. Thus each of the bearing shafts,
together with the associated carrier and the associated drive, forms a turret for
a plurality of grinding-wheel axles.
[0026] The grinding-wheel axles 28, 48 of the grinding-wheel motors 27, 47 lie parallel
to the associated bearing shaft 25, 45 and, on rotation of the bearing shaft 25, 45,
move along a circular path around the bearing shaft 25, 45, as can be seen in particular
from Figures 3 and 4.
[0027] In this example, a single grinding wheel 30, 50 is arranged removably on each grinding-wheel
axle 27, 47. Each grinding wheel 30, 50 is provided on its outer circumferential edge
with a suitable grinding profile. The grinding wheels 30, 50 which are associated
with each of the grinding units 21, 41, with regard to their grinding profile, have
accurately the same dimensions and grinding profile; in practice, these dimensions
preferably lie within a range of at most one hundredth of a millimetre. Furthermore,
the grinding profiles of the grinding wheels 30, 50 associated with a grinding unit
21, 41 lie accurately in one common vertical plane.
[0028] In a variant which is not shown, it is possible to provide a common drive for the
grinding-wheel axles associated with a grinding unit.
[0029] A support wheel 62, 72 for the strip steel 19, which support wheel is mounted such
that it can rotate about an associated axle and around which wheel the strip steel
19 lies, is situated inside the circular path of grinding-wheel axles 27, 47 of each
of the grinding units 21, 41. Each support wheel 62, 72 as an outwardly projecting
shoulder for supporting the bottom edge of the strip steel 19 and, above this, a cylindrical
support face against which one of the side edges of the strip steel 19 bears. The
cylindrical support face ends at a distance below the top edge of the strip steel
19, so that the grinding wheels 30, 50 do not come into contact with the support wheels
62, 72 in question. This design of the support wheels 62, 72 can be seen in particular
from Figure 5, the support wheel having a diameter of approximately 0.2 metre; in
this figure, the strip steel around the wheel can be seen only as a thin vertical
line.
[0030] Each of the support wheels 62, 72 is disposed in such a way that the upper edge region
of the strip steel 19, where the teeth are being provided, can be moved into the path
of the grinding wheels 30, 50 which are rotating about the associated bearing shaft
25, 45, so that the grinding wheels 30, 50 can machine the strip steel at the corresponding
machining position A, B. The grinding wheels are free of the blade at every position
along the path apart from at the machining position.
[0031] Since the grinding-wheel axles 27, 47 run through a fixed, circular path with respect
to the frame 20 of the grinding device 6, there is provision for each support wheel
62, 72 to be adjustable with respect to the circular path of the associated grinding-wheel
axles 27, 47. For this purpose, the rotation axle of each support wheel 62, 72 is
arranged on a carriage, respectively a first carriage 64 associated with the first
grinding unit 21 and a second carriage 74 associated with the second grinding unit
41, which carriages can be displaced horizontally and adjusted vertically with respect
to the frame 20 of the grinding device 6.
[0032] The first carriage 64 bears the vertical rotation axle of the first support wheel
62 and, furthermore, a first guide wheel 65 for the strip steel 19, which guide wheel
can rotate freely about an axle which is vertical with respect to the first carriage
64. On either side of the machining position A, the strip steel 19 preferably bears
against the support wheel 62 through an angle of at least 45°, and the same applies
to the situation at machining position B. By means of the stress in the strip steel
19 and the curvature in the strip steel 19 at the location of a machining position
A, B, the strip steel 19, which is per se thin and flexible, is supported stably and
is not subject to any undesirable deformation during grinding.
[0033] The support wheel 72 which is associated with the second grinding unit 41 is arranged
on the second carriage 74, which is arranged on the frame 20 of the grinding device
6 in such a manner that it can be displaced horizontally and adjusted vertically independently
of the first carriage 64. Furthermore, a second guide wheel 66, a third guide wheel
67 and a fourth guide wheel 75 are arranged on the second carriage 74, which guide
wheels can each rotate about a vertical axle which is fixed with respect to the second
carriage 74.
[0034] The grinding device 6 furthermore comprises a fifth guide wheel 80 for the strip
steel 19, which fifth guide wheel 80 is arranged movably for the purpose of accurately
adjusting the length of the path for the strip steel 19 between the first machining
position A and the second machining position B. This adjustment possibility is provided
in order to enable the strip steel 19, while the strip steel 19 is at a standstill,
to be ground simultaneously at both machining positions A, B. In that case, the length
between the two machining positions A, B must precisely correspond to the distance
between the teeth to be machined. In the embodiment shown, there is provision for
the fifth guide wheel 80 to be displaceable with respect to the frame 20 of the grinding
device 6 by means of an associated linear actuator 81.
[0035] To produce a cutting blade with scalloped teeth, which is a generally known and widely
occurring shape of tooth for cutting blades for bread-cutting machines, the blanking
tool 6 punches a part, which is preferably in the form of a segment of a circle, out
of the top area of the strip steel 19, as illustrated in Figure 6a. The pitch of the
teeth is in this example half an inch. The grinding device 6 then carries out a grinding
operation on both sides of the strip steel 19, which grinding operation produces a
cutting edge 19a which has scallops and is located accurately in the centre plane
of the cutting blade and also produces, on each side of the cutting blade, a surface
19b which is ground at an angle and runs from the cutting edge 19a towards the associated
side, as shown in Figure 6b. The mutually opposite bevels 19b are completely symmetrical
with respect to the centre plane of the cutting blade. Obviously, the installation
is also suitable for producing other tooth shapes, for example with a semi-elliptical
or substantially V-shaped or U-shaped recess between two adjacent tooth points.
[0036] To obtain the teeth shown in Figure 6 and described above, all the grinding wheels
30, 50 have a grinding profile which, in cross-section in a plane comprising the grinding-wheel
axle 27, 47, virtually corresponds to a radius of curvature R about a curvature centre
point which lies on the line intersecting the plane of section and the centre plane
of the grinding wheel. This is illustrated in Figure 7.
[0037] To produce the tooth shape shown, the rotation axle of each of the support wheels
62, 72 of the grinding device 6 lies accurately in the common centre plane of the
grinding wheels 30, 50 associated with the grinding unit 21, 41 in question.
[0038] In Figure 4, it is indicated by arrows that the direction of rotation of the grinding
wheels 50 is such that the grinding force exerted by the grinding wheels 50 presses
the bottom edge of the strip steel 19 against the shoulder face of the support wheel
72. The direction of movement of the grinding-wheel axles 47 along the common circular
path is opposite to this and therefore, at the machining position B, runs in the direction
from the bottom edge of the strip steel 19 towards the top edge. Owing to the high
rotational speed of the grinding wheels 50, for example 10,000 revolutions per minute,
the effective force on the strip steel 19 is in the direction of the shoulder face
of the support wheel 72. The above-described direction of movement of the grinding
wheels 50 about the bearing shaft 45 has the advantage that the grinding wheels 50,
at the start of grinding, firstly run up against the side of the strip steel 19 and
not on to the narrow top edge, which would be the case if the direction of movement
of the grinding wheels 50 about the bearing shaft 45 were reversed. In the case of
the first grinding unit 21, the direction of rotation of the grinding wheels 30 and
the rotation of the bearing shaft 25 are likewise in the same direction. However,
opposite directions of rotation of the bearing shaft and the grinding wheels are also
possible and, under different production circumstances, may be more advantageous.
In a variant of the grinding device 6 which is not shown, the path of a set of grinding
wheels could also be other than circular, for example elliptical.
[0039] The grinding device 6 is preferably designed in such a way that the bearing shaft
25, 45 of each of the grinding units 21, 41 rotates continuously at a constant speed,
for example 25 revolutions per minute. Preferably, in this case, the grinding operation
for producing a single bevel 19b on one side of the strip steel 19 is realized by
means of one grinding wheel which moves past the machining position in question, after
which the conveyor station 8 of the installation, after the said one grinding wheel
has moved past, conveys the strip steel 19 further by one step, which corresponds
to the length of the pitch between the teeth, and then comes to a standstill, so that
the next grinding wheel can grind the following bevel 19b. This means that the conveyance
of the strip steel 19 must be accurately synchronized with the movement of the grinding
wheels 30, 50 past the machining positions A, B. With a rotational speed of the bearing
shafts 25, 45 of 25 revolutions per minute and six grinding wheels 30, 50 per grinding
unit 21, 41, it is possible to grind 150 teeth per minute.
[0040] In a variant of the grinding device 6 which is not shown, each bevel 19b could be
produced by a set of two or more grinding wheels of the same grinding unit which follow
one another in the path of the turret and have different grinding profiles. In this
case, the strip steel would only be conveyed onwards after all the grinding wheels
of the set in question have moved past. Obviously, it is also possible to arrange
a plurality of grinding units on one side of the strip steel, each with their own
set of grinding wheels.
[0041] As is known, a considerable amount of heat is produced when grinding steel. For a
number of reasons, this heat has to be dissipated. Firstly, an excessive temperature
of the strip steel 19 leads to a loss in strip steel quality, and in particular the
structure of the steel obtained by hardening can be lost, with the result that the
cutting blades wear quickly on use. Furthermore, a high temperature is disadvantageous
for the service life of the grinding profiles of the grinding wheels 30, 50, and the
dimensional accuracy of the grinding wheels 30, 50 is also adversely affected. Finally,
the build-up of heat in the grinding device 6 can lead to thermal deformation, which
has an adverse effect on the accuracy of the grinding process.
[0042] In the case of the grinding device 6, the grinding wheels 30, 50 are not in contact
with the strip steel 19 over a large part of their orbit about the bearing shaft 25,
45, and effective cooling can take place. This cooling is preferably realized by spraying
high-pressure jets of cooled oil on to the grinding wheels 30, 50. The oil pressure
is preferably higher than 10 bar, in order in this way to break up the dynamic layer
of air which forms around the rapidly rotating grinding wheels 30, 50. Advantageously,
the oil is cooled to a temperature of less than 10°C, preferably to approximately
5°C. The oil which is sprayed on to the grinding wheels 30, 50 is circulated via a
filter, in which the metal particles are removed firstly magnetically and then using
a centrifuge, and a cooling device which is located downstream of the said filter.
The oil also flows over the other parts of the grinding device 6, so that those parts
of the grinding device 6 which are relevant to the accuracy of the grinding process
do not undergo any temperature fluctuations.
[0043] The grinding device 6 described can be used to achieve a very high accuracy of the
desired shape of tooth. In particular, it is possible for the ground, inclined surfaces
19b to intersect one another precisely in the centre plane of the cutting blade and
for the said ground surfaces 19b to be exactly symmetrical with respect to the said
centre plane. This symmetry is of considerable importance, since otherwise the cutting
blades are subjected to a higher lateral load in one direction while cutting a product,
for example bread, and as a result will bend laterally, leading to an oscillating
motion of the cutting blades with respect to the product to be cut and, possibly,
to excess wear to and breakage of the cutting blades.
[0044] In a variant of the device according to the invention which is shown diagrammatically
in Figure 8, there is provision for a single support wheel to be replaced by two adjacent
wheels 100, 101, the strip steel 19 lying around the two wheels 100, 101. If the support
wheels 100 and 101 each have a diameter of 0.1 metre, the space required is approximately
equal to a single support wheel of 0.2 metre as described above. In this case, there
is furthermore provision for a plurality of grinding wheels 103 to be arranged on
each grinding-wheel axle 102, which grinding wheels simultaneously grind a plurality
of teeth in the straight piece of the strip steel 19 between the two support wheels
100, 101. If appropriate, this straight piece of strip steel 19 may be supported by
an anvil block 105. This variant with two grinding wheels per grinding-wheel axle
is suitable in particular if the installation described is to be used to produce cutting
blades with a tooth pitch of 1/4 inch. In this case, the production capacity remains
equal to the production capacity described above for cutting blades with a tooth pitch
of half an inch. To produce cutting blades with a tooth pitch of 1/8 inch, four grinding
wheels may be arranged on a single grinding-wheel axle.
[0045] Figure 9 diagrammatically shows the layout of a preferred embodiment of the conveyer
means of the conveyor station 8 which conveys the strip steel 19 in steps. The conveyor
means comprise two substantially identical threaded-spindle mechanisms 90, 91, each
with a threaded spindle 92, 93 which is disposed parallel to the path of the strip
steel 19. A nut 94, 95 is arranged on each threaded spindle 92, 93, which nut can
be moved to and fro by rotating the threaded spindle. An electronically actuable hydraulic
clamp 96 is arranged on each nut 94, 95 for the purpose of clamping the strip steel
19 in place. An electric stepper motor 97, 98 for rotating the threaded spindle in
a stepwise manner is provided for each threaded spindle 92, 93. The conveyor station
8 furthermore comprises control means 99, which are designed to convey the strip steel
19 using one of the two threaded-spindle mechanisms 90, 91, while, in the meantime,
the clamp of the other threaded-spindle mechanism moves counter to the direction of
transport of the strip steel, towards a position where it takes hold of the strip
steel 19 and receives it after it has been conveyed. These conveyor means 8 are able
to bring about a highly frequent stepwise conveyance of the strip steel with a very
uniform step length, all this taking place synchronously with the action of the grinding
device 6 and the blanking device 5.
[0046] The blade-conveying means therefore comprise a first threaded-spindle mechanism,
with at least one threaded spindle disposed parallel to the path of the blade, a blade
clamp for holding the blade in place being connected to the threaded spindle and a
motor being provided for the purpose of rotating the threaded spindle in steps.
[0047] In the drawing, the blade-conveying means furthermore comprise a second threaded-spindle
mechanism, which is substantially identical to the first threaded spindle, the blade-conveying
means being designed to convey the blade using one of the two threaded-spindle mechanisms,
while, in the meantime, the other threaded-spindle mechanism moves counter to the
direction of transport of the blade, towards a position where it can take hold of
the blade and convey it onwards.
[0048] In a variant of the grinding device which is not shown, there is provision for a
profiling and conditioning device to be disposed in the region of each grinding unit,
by means of which device the grinding wheels of the said grinding unit can be regularly
profiled and then conditioned without the grinding wheels having to be removed from
their grinding-wheel axle for this purpose.
[0049] The installation described can be used to produce toothed cutting blades and the
like with a minimal deployment of personnel and with a high production capacity. These
cutting blades therefore have a low cost price. Furthermore, the accuracy with which
the teeth are provided and the optimum grinding conditions lead to a high quality
of the cutting blades, which are characterized by a long service life.
1. Device for providing ground teeth on an elongate blade, in particular on strip steel,
comprising:
- a frame,
- a first grinding unit, which is supported by the frame, which first grinding unit
comprises a plurality of grinding-wheel axles which can be driven in rotation, each
for holding at least one grinding wheel, as well as grinding-wheel drive means for
driving the grinding-wheel axles,
- the first grinding unit furthermore comprising a turret for the grinding-wheel axles,
which turret defines a common loop-shaped path for the grinding-wheel axles and furthermore
comprises turret drive means for moving the grinding-wheel axles along the path,
- blade-support means which comprise a first blade support for supporting the blade
at a first machining position,
- the path defined by the turret being such that the grinding wheels successively
move past the first machining position for grinding the blade.
2. Device according to claim 1, in which the blade-support means comprise a second blade
support for supporting the blade at a second machining position and the device comprises
a second grinding unit of the same type as the first grinding unit, the path of the
second grinding unit being such that the grinding wheels successively move past the
second machining position.
3. Device according to claim 2, in which the first machining position and the second
machining position lie on opposite sides of the blade.
4. Device according to one or more of the preceding claims, in which the device is provided
with blade-conveying means for conveying the blade in steps past the at least one
machining position.
5. Device according to claim 2, in which the path of the grinding wheels of each of the
grinding units is fixed with respect to the frame, and in which blade-guiding means
are provided between the first blade support and the second blade support, which blade-guiding
means form a path for the blade and are designed to adapt the length of the path.
6. Device according to claim 5, in which the turret drive means are designed to effect
a continuous movement of the grinding-wheel axles along the path, and in which the
blade-conveying means are designed to convey the blade during the period in which
there is no grinding wheel present at a machining position.
7. Device according to claim 5, in which a blade support is separately adjustable with
respect to the associated path of the grinding wheels, for the purpose of adjusting
the grinding action of the grinding wheels which move past the blade support in question.
8. Device according to one or more of the preceding claims, in which a machining position
is situated inside the path of the grinding wheels which is defined by the turret.
9. Device according to one or more of the preceding claims, in which a blade support
comprises a support wheel which can rotate about an associated axis of rotation and
the outer circumference of which is designed to support a blade which lies over part
of the outer circumference.
10. Device according to claim 9, in which a blade support comprises two support wheels
which are situated next to one another and are disposed in such a manner that the
blade lies around both support wheels and the path of the grinding wheels is situated
at the location of the straight part of the blade between the two support wheels.
11. Device according to one or more of the preceding claims, in which a separate drive
means is provided for each of the grinding-wheel axles.
12. Device according to one or more of the preceding claims, in which the grinding-wheel
drive means are designed to drive the grinding-wheel axles in rotation in a direction
opposite to the direction of movement of the grinding-wheel axles along the path.
13. Device according to one or more of the preceding claims, in which the turret comprises
a bearing shaft which is mounted at a fixed position in such a manner that it can
rotate with respect to the frame, and a grinding-wheel carrier which is attached to
the bearing shaft and bears the grinding-wheel axles parallel to one another and at
a uniform distance around the bearing shaft, so that the loop-shaped path of the grinding-wheel
axles is a circle.
1. Vorrichtung zum Anbringen von geschliffenen Zähnen auf einem länglichen Band, insbesondere
auf Stahlband, aufweisend:
- ein Gestell,
- eine erste Schleifeinheit, die vom Gestell getragen wird, welche erste Schleifeinheit
eine Vielzahl von Schleifscheibenachsen aufweist, die zur Rotation angetrieben werden
können und von denen jede zum Halten mindestens einer Schleifscheibe bestimmt ist,
sowie Schleifscheiben-Antriebsmittel zum Antreiben der Schleifscheibenachsen,
- wobei die erste Schleifeinheit weiter einen Pistolenkopf für die Schleifscheibenachsen
aufweist, welcher Pistolenkopf einen gemeinsamen schleifenförmigen Weg für die Schleifscheibenachsen
definiert und des weiteren Pistolenkopfantriebsmittel zum Bewegen der Schleifscheibenachsen
entlang dem Weg aufweist,
- Bandhaltemittel, die eine erste Bandhalterung zum Halten des Bandes an einer ersten
Verarbeitungsposition aufweisen,
- wobei der Weg, der durch den Pistolenkopf definiert wird, so ist, dass sich die
Schleifscheiben nacheinander über die erste verarbeitungsposition zum Schleifen des
Bandes hinaus bewegen.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Bandhaltemittel eine zweite Bandhalterung zum Halten des Bandes an einer zweiten
Verarbeitungsposition aufweisen und die Vorrichtung eine zweite Schleifeinheit derselben
Art wie die erste Schleifeinheit aufweist, wobei der Weg der zweiten Schleifeinheit
so ist, dass sich die Schleifscheiben nacheinander über die zweite Verarbeitungsposition
hinaus bewegen.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die erste Verarbeitungsposition und die zweite Verarbeitungsposition auf entgegengesetzten
Seiten des Bandes liegen.
4. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung mit Bandbeförderungsmitteln zum Befördern des Bandes schrittweise
über die mindestens eine Verarbeitungsposition ausgestattet ist.
5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Weg der Schleifscheiben jeder der Schleifeinheiten in Bezug auf das Gestell fest
ist und dadurch, dass Bandführungsmittel zwischen der ersten Bandhalterung und der
zweiten Bandhalterung vorhanden sind, welchen Bandführungsmittel einen Weg für das
Band bilden und ausgelegt sind, um die Länge des Weges anzupassen.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Pistolenkopfantriebsmittel dafür ausgebildet sind, eine kontinuierliche Bewegung
der Schleifscheibenachsen entlang dem Weg zu bewirken, und dadurch, dass die Bandbeförderungsmittel
dafür ausgelegt sind, das Band während der Zeitspanne, in der keine Schleifscheibe
an einer Verarbeitungsposition anwesend ist, zu befördern.
7. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass eine Bandhalterung in Bezug auf den zugehörigen Weg der Schleifscheiben zum Zweck
des Einstellens der Schleifwirkung des Schleifscheiben, die sich über die betreffende
Bandhalterung hinaus bewegen, separat einstellbar ist.
8. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sich eine Verarbeitungsposition innerhalb des Weges der Schleifscheiben befindet,
der durch den Pistolenkopf definiert wird.
9. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass eine Bandhalterung eine Haltescheibe aufweist, die um eine zugehörige Rotationsachse
rotieren kann und deren äußerer Umfang dafür ausgelegt ist, ein Band zu tragen, welches
über einem Teil des äußeren Umfangs liegt.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass eine Bandhalterung zwei Haltescheiben aufweist, die sich nebeneinander befinden und
so angeordnet sind, dass das Band um beide Haltescheiben herum liegt und sich der
Weg der Schleifscheiben an der Stelle des geraden Teils des Bandes zwischen den beiden
Haltescheiben befindet.
11. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass ein separates Antriebsmittel für jede der Schleifscheibenachsen vorhanden ist.
12. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Schleifscheibenantriebsmittel dafür ausgelegt sind, die Schleifscheibenachsen
entgegengesetzt zur Bewegungsrichtung der Schleifscheibenachsen entlang dem Weg zur
Rotation anzutreiben.
13. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Pistolenkopf eine Lagerwelle aufweist, die an einer ortsfesten Position so angebracht
ist, dass sie in Bezug auf das Gestell rotieren kann, und eine Schleifscheibenhalterung,
die an der Lagerwelle angebracht ist und die Schleifscheibenachsen parallel zueinander
und an einem uniformen Abstand um die Lagerwelle herum trägt, so dass der schleifenförmige
Weg der Schleifscheibenachsen ein Kreis ist.
1. Dispositif pour meuler des dents de scie sur une lame allongée, en particulier sur
de l'acier en bande, comprenant :
un bâti,
une première unité de meulage qui est supportée par le bâti, cette première unité
de meulage comprenant une pluralité d'axes de meules qui peuvent être entraînés en
rotation, chacun pour porter au moins une meule, ainsi que des moyens d'entraînement
en rotation pour entraîner les axes des meules,
la première unité de meulage comprenant encore une tourelle pour les axes de meule,
cette tourelle définissant un trajet commun en boucle pour les axes de meule et comprenant
encore des moyens d'entraînement de tourelle pour déplacer les axes de meule le long
du trajet,
des moyens supports de lame qui comprennent un premier support de lame pour supporter
la lame, en une première position d'usinage,
le trajet défini par la tourelle étant tel que les meules se déplacent successivement
devant la première position d'usinage, pour meuler le lame.
2. Dispositif suivant la revendication 1, dans lequel les moyens supports de lame comprennent
un second support de lame pour supporter la lame, en une seconde position d'usinage,
et le dispositif comprend une seconde unité d'usinage, du même type que la première,
le trajet de la seconde unité d'usinage étant tel que les meules se déplacent successivement
devant la seconde position d'usinage.
3. Dispositif suivant la revendication 2, dans lequel la première position d'usinage
et la seconde position d'usinage se trouvent sur des côtés opposés de la bande.
4. Dispositif suivant l'une ou plusieurs des revendications précédentes, dans lequel
le dispositif est pourvu de moyens de convoyage de bande pour convoyer la lame, par
étapes, une fois passée une position d'usinage au moins.
5. Dispositif suivant la revendication 2, dans lequel le trajet des meules de chacune
des unités de meulage est fixe par rapport au bâti et dans lequel sont prévus des
moyens de guidage de lame entre le premier support de lame et le second support de
lame, ces moyens de guidage de lame formant un trajet pour la lame et sont prévus
pour adapter la longueur du trajet.
6. Dispositif suivant la revendication 5, dans lequel sont prévus des moyens d'entraînement
dc tourelle pour effectuer un mouvement continu des axes de meule, le long du trajet,
et des moyens de convoyage de lame pour convoyer la lame, pendant la période où il
n'y a pas de meule présente en position d'usinage.
7. Dispositif suivant la revendication 5, dans lequel un support de lame est séparément
ajustable par rapport au trajet associé des meules, dans le but d'ajuster l'action
de meulage des meules qui se déplacent en passant devant le support de bande en question.
8. Dispositif suivant l'une ou plusieurs des revendications précédentes, dans lequel
une position d'usinage se trouve à l'intérieur du trajet des meules qui est défini
par la tourelle.
9. Dispositif suivant l'une ou plusieurs des revendications précédentes, dans lequel
un support de lame comprend une roue support qui peut tourner autour d'un axe associé
de rotation et dont la circonférence externe est prévue pour supporter une lame qui
se trouve au-dessus d'une partie de la circonférence externe.
10. Dispositif suivant la revendication 9, dans lequel une support de lame comprend deux
roues supports qui se trouvent l'une près de l'autre et sont disposées de façon que
la lame se trouve autour des deux roues supports et que le trajet des meules se trouve
sur la portion droite de la bande entre les deux roues supports.
11. Dispositif suivant l'une ou plusieurs des revendications précédentes, dans lequel
est prévu un moyen d'entraînement séparé pour chacun des axes de meules.
12. Dispositif suivant l'une ou plusieurs des revendications précédentes, dans lequel
sont prévus des moyens d'entraînement de meules pour entraîner les axes de meule en
rotation dans un sens opposé au sens du mouvement des axes de meules le long du trajet.
13. Dispositif suivant l'une ou plusieurs des revendications précédentes, dans lequel
la tourelle comprend un arbre de roulement qui est monté en position fixe de façon
qu'elle puisse tourner par rapport au bâti, et un porteur de meule qui est fixé à
l'axe de roulement et porte les axes de meules parallèles entre eux et à distance
uniforme autour de l'axe de roulement de façon que le trajet en boucle des axes de
meules soit un cercle.