Arrangement for securing a replaceable cutting blade on a rotating knife holder in a cutting assembly for a meat mincing machine

Abstract: Arrangement for securing a replaceable cutting blade (1) on a rotating knife holder (2) in a cutting assembly for a meat mincing machine, the blade (1) of the rotating knife holder (2) rotating along the surface of a perforated disc (3), the arrangement comprising at least one slot (4) in the knife holder (2) adapted to the thickness of the cutting blade (1) in such a way that the replaceable cutting blade (1) can be positioned in the slot (4) and thereby partially secured in the knife holder (2). The arrangement comprises a screw (5) positioned in a threaded bore (6) provided in the knife holder (2), the threaded bore extending transversely with respect to the slot (4) in such a way that the screw (5) can be moved in the threaded bore (2) to engagement with a replaceable cutting blade (1) inserted into the slot for completely securing the blade in the knife holder (2). The threaded bore (6) is provided as a blind hole with a minor hole at the bottom for insertion of a tool for tightening the screw (5). By this arrangement it is achieved that the screw (5) is prevented from falling out of the arrangement and into the product.

Description: TECHNICAL FIELD The present invention relates to an arrangement for securing a replaceable cutting blade on a rotating knife holder in a cutting assembly for a meat mincing machine. The cutting assembly comprises in the usual way at least one stationary perforated disc and a rotating knife having a blade rotating along the surface of the perforated disc. BACKGROUND ART Mounting arrangements are known, comprising at least one slot in the knife holder, adapted to the thickness of the cutting blade in such a way that the replaceable blade can be positioned in the slot and thereby partly be fixed in the knife holder. Usually, further means are needed in order to secure the replaceable cutting blades radially in the knife holder, which e.g. is done by placing a securing ring radially externally of the cutting blades, or, as shown in US-1,033,001, by means of a screw. From US-2,259,623 it is known to mount the replaceable blade in a slot provided in the knife holder, and to secure the cutting blade against the bottom of the slot by means of a screw, inserted in a threaded bore extending traversely of the blade through the knife holder, the screw having a conical tip for engaging a hole in the blade. In this construction, there is a risk that the screw and blade fall out of the knife holder, whereby they are mixed with the product and possibly damage the cutting assembly or other parts of the machinery. DISCLOSURE OF THE INVENTION It is the object of the present invention to provide an improved arrangement of the above-mentioned type, whereby the above-mentioned inconveniencies are ameliorated without unnecessarily impeding the replacement of the replaceable cutting blades. According to the invention, this is achieved by an arrangement of the above-mentioned kind, which according to the present invention also comprises the features set forth in the characterizing clause of claim 1. Preferred embodiments of the invention are revealed in claims 2 and 3. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described further in the following with reference to the drawing, in which Figure 1 shows an exploded view of an embodiment of an arrangement in accordance with the invention, Figure 2 shows a partial cross section along the slot in a knife holder in accordance with the invention and a cutting blade for mounting in this slot, Figure 3 shows a cross section corresponding to Figure 2, in which the cutting blade is mounted in the slot, Figure 4 shows a cross section of a knife holder corresponding to the knife holder in Figure 1, 2 and 3, in a plane extending traversely of the slot for the cutting blade and parallel to the direction of the threaded bore, and a cutting blade and screw, not yet mounted, Figure 5 shows a cross section corresponding to Figure 4, in which the cutting blade and the screw have been mounted and tightened, and Figure 6 shows a cross section corresponding to Figure 4 and 5, in which the cutting blade has been mounted, but the screw is not yet tightened. DESCRIPTION OF THE PREFERRED EMBODIMENT The embodiment of the arrangement for securing a replaceable cutting blade 1 on a rotating knife holder 2 in a cutting assembly in a meat mincing machine, shown in Figure 1, is formed with a knife holder 2 with three wings, each wing being provided with a slot 4 for partially securing a cutting blade 1 in each of the wings. The rotating knife holder 2 is designed to rotate along the surface of a stationary perforated disc 3, the cutting edge of the cutting blade 1 positioned in short distance from the perforated disc 3. Usually, the cutting assembly, as shown in Figure 1, is used at the end of a transport screw in a meat mincing machine and the rotating knife holder 2 is rotated in unison with the transport screw by means of the engagement between these, which is provided by the hexagon-formed hole in the rotating knife holder 2 shown in Figure 1. The preferred embodiment of the cutting blade 1 shown in Figure 2 is provided with a keyhole-formed cut-out 7,9 comprising a circular hole 7 and an insertion slot 9, which makes it possible to insert the cutting blade 1 in the slot 4, when the screw 5 is positioned in a position, as shown in Figure 6. Figure 2 shows how the cutting blade 1 is inserted into the slot 4 in the knife holder 2. Figure 3 shows the cutting blade 1 inserted in the slot 4 in the knife holder 2 and indicates how the screw 5 engaging the circular hole 7 with the conical tip 8 of the screw 5 will press the cutting blade 1 against the bottom of the slot 4. Figure 4 shows how the screw 5 is introduced into the knife holder 2 from the backside of the wing into the threaded bore 6, the engagement means on the screw 5 for a tool being positioned against the front side of the wing. The screw 5 is screwed into the threaded bore 6 by means of a tool, until the screw 5 engages the bottom of the threaded bore, as shown in Figure 6. Then the cutting blade 1 is inserted into the slot 4, the insertion slot 9 in the cutting blade 1 admitting the cutting blade 1 to move past the conical tip 8 of the screw 5, when the screw 5 is positioned completely screwed in, as shown in Figure 6. Then the screw 5 is tightened, as shown in Figure 5, until the conical tip 8 of the screw 5 engages the circular hole 7 at the back of the insertion slot 9 in the cutting blade 1. Preferably, the circular hole 7 is positioned excentrically with respect to the threaded bore 6, when the cutting blade 1 is positioned as shown in Figure 3, the excentricity being adapted in such a way that the conical tip 8 of the screw 5 wedges the cutting blade 1 against the bottom of the slot 4 in the knife holder 2 tightening the screw 5 to the position shown in Figure 5. The embodiment of the arrangement in accordance with the invention shown provides several advantages compared to prior known securing arrangements. The screw 5 is prevented from falling out of the knife holder 2, being stopped at one end by the bottom of the threaded bore 6 and at the other end by the cutting blade 1. Thus, there is no danger that the screw 5 is released and mixed into the meat product, which is to be minced by means of the meat mincing machine. The cutting blade 1 is prevented from being thrown out of the knife holder 2, even if the screw 5 is loosened, the screw 5 not being able to move further backwards in the threaded bore than to the bottom of the threaded bore, whereby the conical tip 8 of the screw 5 is still engaged in the circular hole 7 in the cutting blade 1 and thus preventing the cutting blade 1 from moving in a radial direction influenced by the centrifugal force by the rotation of the knife holder 2. Although the invention has been explained in the foregoing in connection with a specific embodiment, it is clear that the invention is not limited to this single embodiment, several variations being possible within the scope of the appended claims, such as a variation of the number of wings on the knife holder 2, the form of the cut-out 7; 7,9 and the insertion slot 9 in the cutting blade 1, etc.

Claims: Arrangement for securing a replaceable cutting blade (1) on a rotating knife holder (2) in a cutting assembly in a meat mincing machine, in which the cutting blade (1) of the rotating knife holder (2) rotates along the surface of a perforated disc (3), said arrangement comprising the formation of securing features on the cutting blade (1), the rotating knife holder (2) and a screw (5), the securing arrangement comprising at least one slot (4) adapted to the thickness of the cutting blade (1), formed in the knife holder (2) in such a way that the replaceable cutting blade (1) can be positioned in the slot (4), and a screw (5) positioned in a threaded bore (6) formed in the knife holder (2), the threaded bore extending transversely of the slot (4) in such a way that the screw (5) can be moved in the threaded bore (2) to engagement with a cutting blade (1) inserted in the slot (4), for completely securing the cutting blade (1) in the knife holder (2), the cutting blade (1) comprising a cut-out (7; 7,9), preferably a circular hole (7), for engagement with a conical tip (8) of the screw (5), the cut-out (7; 7,9) being formed and placed in such a way that the cutting blade (1) by engagement with the conical tip (8) is wedged against the bottom of the slot (4), characterized in that the threaded bore (6) is formed as a blind hole with a through-going bore at the bottom of the threaded bore, the through-going hole having a diameter, which is smaller than the diameter of the screw (5), the through-going hole permitting insertion of a tool to tighten the screw (5) for completely securing the cutting blade (1) in the knife holder (2). Arrangement in accordance with claim 1, characterized by the cutting blade (1) further comprising an insertion slot (9), admitting manual detachment and insertion of the cutting blade (1) in the slot (4), when the screw (5) is loosened, but still protruding into the slot (4). Arrangement in accordance with claim 2, characterized in that the position of the bottom of the blind hole is adapted to the length of the screw (5) in such a way that when the screw (5) is inserted into the threaded bore (6) and screwed to engagement against the bottom of the blind hole, the conical tip (8) of the screw (5) is protruding into the slot (4) for partially securing the cutting blade (1).

Inventors: JENSEN HILMER, JENSEN, HILMER
Applicants: WOLFKING DANMARK AS, WOLFKING DANMARK A/S
Application year: 1998
Main classification: B02C18
IPC codes: B02C18