FR2811914A1 - Knife mount in which knives can be adjusted and locked on the shaft of a motor used in cutting machines for the pork butchery industry - Google Patents

Abstract

Knife mount allows the adjustment and locking of knives on the motor shaft of machines, in which each knife (1) has the usual shape with beveled edge (1a) and fixing zone with a slot (1b). A rack (1c) machined in the fixing zone, on the side opposite to the beveled edge, is designed to mesh with a similar rack machined in the rack segment (4). A hole (1d) for a screw fixes rack to support washer by screwing on a locking nut with flats. The support washer cooperating with the rack segment (4) can be moved on it by several millimeters by means of an eccentric stage cam guided longitudinally by pins fixed on the washer. The washer has a slide which provides clearance for the nut (7) and also the knife in which it is partly located.

Description

The present invention relates to a device

  putting the mounting, adjustment and locking of the

  teaux used in so-called "cutters" machines used to grind, chop and mix products, in particular in delicatessen and salting. These machines include a number of knives, most often three, four or six, arranged on a horizontal axis rotating at high speed in a tank of semi-toric shape. The knives are placed one after the other on this axis, angularly offset by 30, 60, 90, or 180 depending on the number of knives used and the nature of the work to be carried out, and adjusted so that

  their end is flush with the semi-toric tank.

  In modern machines the speed of rotation of the shaft - and therefore of the knives - can be very high. Most current machines normally operate at more than

  3,000 rpm, some exceeding 5,000 rpm.

  These speeds cause the appearance of a considerable centrifugal force tending to disrupt the knives by moving them away from their center of rotation. Despite a tightening

  energetic, it can happen that they slide between the pucks-

  the spacers placed between them, and that their end

  be in contact with the machine tank or the consequences

  what we can imagine: deep scratches on the tank, breakage of the knives, risk of projecting pieces of metal out of the machine, loss of mass of material during

  "cutterage" due to the inevitable presence of metallic shards

metal rendering it unaffectable.

  Many solutions have been proposed for

  solve these problems. Some are simple, but often

  incomplete or inconvenient to use. Others are so-

  sophisticated, but complex and expensive.

  The present invention therefore relates to a solution

  tion combining easy use, including adjusting the

  knife length is very precise, foolproof, and

  able to resist centrifugal force.

  This device can be implemented by a person

  unskilled personnel, offers solidity, hygiene, reliability, and

interesting manufacturing price.

  In accordance with the invention, each knife has a cutting bevel whose characteristics have no effect.

  bearing on the invention, a fixing zone with an enco-

  che of substantially rectangular shape intended to allow the passage of the drive shaft of the machine while

  allowing sufficient longitudinal travel for

  think about the wear it will undergo as the sharpening takes place.

  It also includes an adjustment rack and a

  hole for securing it with its support washer to

  using a flat screw and nut.

  Intended to communicate to the knife the rotational movement of the machine shaft and allow its adjustment

  with its length locked, the support washer comprises

  a central bore matching the section of the motor shaft

  (most often hexagonal). A longitudinal rack segment

  directly movable over a few millimeters is attached to it. The teeth of its rack are cut identical to those of the knife, so as to mesh with the latter. Mobility

  longitudinal of the rack segment is guaranteed irreversible

  by a cam with two slightly eccentric stages. One of these stages being housed in the thickness of the rack segment, and

  the other in the thickness of the support washer. Behind the scenes

  The longitudinal position of the rack segment is guided using pins pressed into the press in the support washer, sliding in the notches provided for this purpose in the rack segment. Each of these pins has a thread

  in which a screw will be tightened after adjustment.

  On the other hand, in the embodiment described here, a slide is machined in the support washer, allowing the deflection of a flat nut ensuring transverse positioning and, using a screw, the attachment of the knife to this support washer, as well as in cooperation with the movable rack segment, the transmission of the rotational movement of the machine shaft. However, another embodiment not described here but not departing from the scope of the invention, provides for the machining of the slide in the knife

  rather than in the support washer.

  This device has the following advantages. Firstly, a micrometric adjustment of the length of the knife, which no rack system allows. Secondly it allows to give the knife a maximum width of its

  fastening area or increased resistance to lateral forces

  which it was not possible to obtain with the elders

systems.

  Finally it allows to design knives whose

  bevel can develop on a partial angle of rotation

  particularly open, very favorable for certain works.

  An embodiment of the invention is shown

  shown, by way of nonlimiting example, in the appended drawings: FIG. 1 is a plan view of the knife (1) according to the invention, comprising a cutting bevel (la), a substantially rectangular notch (1b), an adjustment rack

  (lc), and a immobilization hole (ld). Near this one

  here is shown a partial section allowing to remark

  quer that the hole (ld) has a counterbore (le). Also on

  this drawing is visible on the rack segment (see fig. 4).

  Fig.2 is a plan view of a support washer (2) having a bore (2a) closely corresponding to the dimensions of the drive shaft (not shown), there is shown a slide (2b), a housing (2c) which will host a

  eccentric cam (see fig. 8), and holes (2d) in the

  which will be press-fitted the guide pins (see fig. 10).

  Fig. 3 is a section along A-A of a washer-

  support (2), on which the counterbores visible are

  carries the slide (2b), and the bore (2c).

  Fig.4 is a plan view of the rack segment (4) comprising a bore (4a) opening into a counterbore of slightly elongated shape (4b), and two very

  short (4c), with counterbores, as well as a rack (4d).

  Fig. 5 completes the previous one according to sections A-A and B-B and shows the counterbores (4b) and (4e) corresponding

  respectively to the holes (4a) and to the slides (4c).

  Fig.6 is a view of the screw (6) of the nut

  flats, in plan (6), and in section (6a).

  Lra fig.7 is a view of the flat nut (7), in plan (7) and in section (7a). Fig. 8 is a view of the cam with eccentric stages

(8) in plan (8) and in section (8a).

  Fig. 9 is a view of a guide pin (9) in

plane (9) and in section (9b).

  Fig.10 shows a screw (10) for

  guide (9), plan view (10) and sectional view (10a).

  While fig.l is shown at 40% scale, figs. 2, 3, 4, 5, 6, 7, 8, 9 and 10 are shown, for

more clarity, at 64% scale.

  Various features of the invention are pre-

  cited in the following description of the implementation:

  The two pins (10) being mounted tight in the press in the holes (2d) of the support washer (2), the

  eccentric cam (8) in the housing (2c) of the washer-

  support (2), the screwdriver slot above. The nut to

  flats (7) is inserted in the slide (2b) and makes sail-

lie a few millimeters.

  The movable rack (4) is then placed on the support washer (2) so that the pins (9) are in place in the slides (4c). The screws (10) are put in

  loose place in the threads of the pins (9).

  The knife (1) is then placed on the washer-sup-

  port (2), its rack (lc) meshing with the teeth of the

  rack-mobile (4) so that the length of the cou-

  teau is set approximately. The flat nut

  (7) which protruded from the support washer (2) penetrates

  be in the hole (ld) of the knife, and its screw (6) will be put

in place not tight.

  The user can now perfect the adjustment of the knife length by inserting a screwdriver into the screwdriver slot of the cam with eccentric stages (8) at

  through the hole (4a) of the mobile rack (4). On tour-

  turning this screwdriver in one direction or the other it will move it longitudinally with the knife which is there

  finds it meshed. The eccentricity of the stepped cam (8) allows

  both, in the embodiment described here, a longi-

  tudinal about 3 millimeters, in relation to the pitch of the teeth of the racks of the rack segment (4) and of the knife (1). Coming after the approximate adjustment obtained during the positioning of the knife (1) on the support washer (2) and the engagement of the racks (lc and 4d), the adjustment

  final obtained by operating the eccentric stepped cam (8)

  will put a fine adjustment. The stages of the cam being very little offset, its rotation is irreversible and this adjustment

  therefore constitutes a reliable locking.

  This done, the user will properly tighten the two screws (10) previously introduced in the guide pins (9), as well as the screw (6) cooperating with the nut

  flats (7). The assembly formed by the knife and its washer-

  support is then ready for use.

  Of course, the few ratings mentioned above

  before are those of the embodiment described here, and are not

not limiting of the invention.

  All the parts undergoing mechanical stresses such as the guide pins (9) the stepped cam (8) and the flat nut (7) are made of treated stainless steel

as well as the knife (1).

Claims (4)

  1.Mounting device allowing the adjustment with locking of knives on the motor shaft of machines known as cutters used to cut, grind, chop and mix products, particularly in cured and salted meats, in which each knife (1) of usual shape with a bevel   (la) and a fixing zone pierced by a notch (lb) sensi-   clearly rectangular, is characterized by a rack   (lc) machined in the fixing zone, on the side opposite the bi-   bucket, intended to mesh with a similar rack (4d) machined in the rack segment (4), and a hole (ld) for the screw (6) which will secure it to the support washer (2)   by screwing into the flat nut (7).   2. Device according to claim 1, character-   supported by a support washer (2) cooperating with the segment-   rack (4), movable on it by a few millimeters, at   by means of a cam with eccentric stages (8), and guided longitudi-   nally by pins (9) fixedly mounted on the washer-   support (2) which also includes a slide (2b) allows   both the deflection of the flat nut (7) and therefore the   knife (1) in which it is partially housed.   3. Device according to claims 1 and 2 comprising   both a cam with two eccentric stages (8) one of which is housed in the cavity (2c) of the support washer (2) and the other in that (4b) machined in the rack segment (4), that '' it will be enough to maneuver in one direction or the other to move the rack-and-pinion segment (4) and consequently the knife (1) in order to optimize the approach setting obtained during   the engagement of the knife with the rack and pinion segment.   4. Device according to claim 2 and 3, character-   laughed at by the guide pins (9) present in the slides (4c) of the rack segment (4) provided with threads (9a) for the addition of clamping screws (10); and a flat nut (7) which, in relation to the rack segment (4) and the support washer (2) ensures the transmission of the rotation of the motor shaft of the machine, and secures the knife (1)   and the support washer (2) using the screw (6).