FR2495035A1 - UNIVERSAL ERGONOMIC SHARPENER - Google Patents

Abstract

This machine is of the type composed of a frame 2 comprising two crossed carriages 7-8, a vertical column 4 and a grinding wheel spindle 6. According to the invention, the articulation bearing 9 of the transverse carriage 7 around the vertical , on the one hand, is disposed in a cantilever manner in a semicircular console 10 and, on the other hand, is crossed by the locking means 13 of the carriage. On this bearing, is also articulated a lever 19 carrying an articulated control unit 20. (CF DRAWING IN BOPI)

Description

The invention relates to an ergonomic universal grinding machine

nomic.

  An affinity machine is said to be "universal" when

  allows it to sharpen, with special accessories, strawberries of all shapes and sizes, drills,

  sore or staggered, taps, reamers, prism tools

  ticks for machine tools and all other cutting tools.

  To this end, the frame of the machine supports, on the one hand,

  means for holding the tool to be sharpened, means for

  on a longitudinally movable carriage, itself

  carried by a transversely displaceable carriage and

  pivoting with respect to the frame, and on the other hand, a

  it seems to be a spindle support comprising means for holding, adjusting in position, and driving in rotation of a grinding wheel.This spindle support assembly is, in general,

  consisting of a vertical column whose vertical position

  ticale is adjustable relative to the frame, by a support

  linked to the column, but with an adjustable angular position

  turn of a vertical axis, and by an arm which, connected to the support

  with the possibility of adjusting its angular position

  turn of a horizontal axis, carries a pin able to receive

any type of grinding wheel.

  Current machines provide the perfect func-

  technical requirements for which they were designed, but they generate fatigue for the personnel using them.In fact, because of the structure of the machine, the

  working area is located at a distance from the ground of the

  from 0.90 to 1 meter and shifted backwards, so that the distance between this zone and the eye of the operator is of the order of 0.45 to 0.5 meters. that to set and control the sharpening operation, the operator must look at the machine, that is to say adopt a

  position which is not well suited to human and general morphology

Trice of discomfort and stiffness.

  Moreover, the structure of the current machines in-

  not allow the operator to sit comfortably, even

  when it is only a question of performing

  sharpening, which helps to increase

  Finally, the dispersion in various areas of the

  China, means for controlling the machining movements or adjustment means, also forces the operator to take uncomfortable positions

  The object of the present invention is to provide a

  ehine to sharpen universal which greatly reduce

  operator fatigue and allows the operator to

  valiantly standing or sitting, whether straight

tier or left-hander, disabled or not.

  To this end, the hinge bearing of the transverse carriage around the vertical on the one hand, is arranged cantilevered with respect to the b & ti in a semi-circular bracket protruding at the front thereof

  and constituting a receptacle for cutting products and

  tector of the operator's legs and, on the other hand, is

  crossed by the rotational locking means of the chain.

  riot whose protruding part under the console forms landing

  for one end of a lever whose end

  free-standing, protruding from the console, supports an articulated control panel, while the upper plane of the longitudinal carriage is located at a distance from the ground between 1.1 and 1.2 meters, so that the zone of

  working distance from the ground by a distance

  be 1.25 and 1.5 meters, and preferably 1.35 meters.

  The arrangement of the trolleys in the immediate vicinity of

  the operator facilitates their handling, both for

  In addition, their arrangement on a console allows the operator to work well, in a comfortable way, while being protected. When seated, he can place his legs under this console and

  Be at the same transverse distance from the working area

  only when standing.This advantage is combined with that resulting from the vertical position of the work area to significantly improve the position of the operator who thus works in conditions

  adapted to its morphology, without constraining its muscular

  lature, so without the risk of painful aches.

  The use of a control panel, articulated on a

  rotating lever relative to the console, also participates

  This table can always be placed in the immediate vicinity of the operator, regardless of the position of the operator.

  It should be noted that by rotating the table on its

  the table can indifferently be arranged on the right

  or to the left of the operator and present, in these two

  the same distribution of the control

  control of the machinery which prohibits any disturbance

  the operator following this change of position.

tion.

  Advantageously, and in order to benefit from the advantages

  tages provided by the use of a height-adjustable column to support the spindle, without this pin is too far from the operator, the grinding spindle block forming with its variable speed drive motor, is mounted with the possibility of adjustment

  angle around a horizontal axis on a Support, itself

  even mounted with possibility of angular adjustment around a vertical axis at the free end of an arm whose other end is mounted on the column of the frame with

  possibility of angular adjustment around a vertical axis.

  The motorized spindle, which benefits from an orientation

  universal, can thus occupy very many posi-

  tions, without the fact that some of them

  too much of the operator and oblige him to

  lean to control the current operation.More-

  This arrangement makes it possible to obtain, for all the useful positions, a task-eye distance of the operator of the order of 0.35 meters improving the visual comfort of the operator without having to approach of the task, that is to say a distance of value well below that of 0.50 meter obtained with traditional sharpening machines.

  In addition, the means

  tudinal upper carriage are composed of two wheels which, arranged on both sides of the transverse carriage near the front edge thereof and in front of the two opposite wheels controlling the movements of the latter carriage, are at hand of the operator. So when the operator is in front of the machine, he

  can, without lengthening the arm and without fatigue, seize the

  lant commanding the movement of the longitudinal carriage that is closest to it-and, if necessary, adjust

  the same conditions the position of the transverse carriage.

  In addition, the longitudinal carriage comprises, at its end,

  anteriorly, a bearing for a bent rod whose

  vertical branch is adjustable in height and in

  tion, and whose horizontal arm supports

adjustable position elbow.

  This elbow support is intended to support the elbow or the forearm of the operator when it performs long operations requiring actuation of the tool

during sharpening.

  In one embodiment, the screw controlling the

  vertical displacements of the column is arranged laterally

  to it, between the latter and the axis of rotation of the carriages, and cooperates with a nut wedged at the end of a radial arm, integral with the lower end of said

column.

  This arrangement automatically compensates for tilting of the column on the front of the machine under the weight of the arm, carrier and spindle as

  the said column rises vertically.

  In order to facilitate the adjustments of the position of the motorized spindle relative to the tool to be sharpened carried by known means resting on the longitudinal carriage,

  the mark of one of the marking means, indicating the po-

  angular position of the spindle support around a vertical axis

  j5 tical, is performed on a ring which, after unlocking, can be rotated to. the end of the arm of the column is connected to the means holding it, whatever the angular position of this arm, in the same relative position with the reference mark of one of the means for locating the position

  angle of the transverse slide around a vertical axis

  cal. It appears that the sharpening machine according to the invention makes it possible, thanks to its structure, to the relative arrangement of

  its components and concentration, close to the o-

  pioneer of its essential means of adjustment and

  It also reduces the fatigue of the latter, but also the dead time of manufacture. Moreover, the doubling of the controls of the carriages and the possibility of moving the control panel allows the operator to give these various organs the position which suits him best, whether he is himself right-handed or left-handed, handicapped or not,

sitting or standing.

  Other features and benefits will emerge

  of the following description with reference to the schematic drawing

  attached text representing, as a non-limita-

  tif, an embodiment of this machine to be fiddled.

  Figure 1 is a side view, in elevation with partial section, Figure 2 is a front view in elevation,

  Figure 3 is a partial bare side with sectional cut

  showing in particular the articulation relative to the console, the carriages and the lever comprising the control panel, Figure 4 is a partial side view, showing in cross section the arm-support assembly connecting the motorized spindle to the FIG. 5 is a sectional view along line 5--5 of FIG. 4, FIG. 6 is a partial view, showing in transverse section an alternative embodiment of the control means of the rotational locking devices, FIG. 7 is a schematic view in FIG. plan over

  highlighting the coincidence of the benchmarks of

  trolleys and spindles irrespective of

  angular section of the arm carrying the latter, Figures 8 and 9 are perspective views showing

  two of the positions that the organs of this

the machine,

  Fig.10 and 11 are schematic plan views of

  above corresponding to fig.8 and 9 and showing more

  the relative position of the various organs of the

China s

  Fig.12 and 13 are side elevational views

  two variants of the machine.

  In known manner, this sharpening machine is composed

  of a frame 2 comprising a guide bearing 3 for a joint

  vertical bar 4, means 5 carrying a pin 6 and a

  carriage 7 movable transversely and carrying a chain

  riot 8, movable longitudinally.The transverse carriage 7 is mounted with the possibility of rotation about an axis

  vertical x'-x with respect to the frame 2.Ie longitudinal trolley

  8, which is intended to receive the means 70 (FIG.

  9) carrying the tool to be afferent, can be monolithic or com-

  carry a stable stable trough for easy adjustments

for some fabrications.

  According to the invention, the hinge bearing 9, allowing

  transverse slide 7 to pivot about the vertical axis

  cal x'-xest disposed cantilever relative to the frame 2 in a bracket 10 protruding at the front of this frame.

  shown in fig.8 and 9, this console is semicircular.

  More specifically, and as shown in FIG. 3.1a, part 12, constituting the bearing itself and which is connected to the bracket 10, is traversed by a vertical shaft 13 whose lower end 13a protruding below the console is threaded and cooperates with the locking control means

  rotation of the transversal carriage.In the form of

  tion shown, these means consist of a nut 1_ integral with a control lever 11a.Celevierqui is arranged below the console is very accessible for

the operator.

  The stepped upper end 13a of this shaft bears, via a flange 1L, on the base 15

  of the cross slide 7.This base is rotatably mounted

  compared to Exhibit 12 with the provision of a

  bearing 16 whose inner race is slidably mounted

  fat on the said piece 12 and is supported on a

  elastic washer 17, itself bearing on the part 12.

  It is easy to conceive that, as soon as the action of the locking control means resulting in the plating of the base 15 on the bearing 12,1a elastic washer 17 becomes preponderant and, through the bearing 16, away the base 15 of the landing 12.This allows the free

  rotation of the transverse slide 7 and the longitudinal slide

  nal 8 worn by the latter.

  carries on its periphery a graduation 75.

  The shaft 13 is also slidably mounted in a

  link 18, protruding below console 10, and around

  which can pivot the end 19a of a lever 19 suppor-

  at its other end 19b, a control housing 20.

  The end 19b, which protrudes laterally from the console, forms a pivot allowing the housing 20 to turn on

himself from at least 180.

  FIG. 3 shows that the rotation guiding means

  The locking and locking of the transverse carriage 7 form a very compact assembly which makes it possible to give the console a very high vertical position by means of which it does not hinder the operator when he wishes to take a seat.

  working position sitting in his feet can

reglabl in self

  to rest on the footrest / 2_L.In other words

  mes, this console allows the operator to place without hindrance his legs under them when he wants to work seated.The distance between the lower face and the ground can have a value of the order of 0.85 to 0.95 meter and, notably,

  0.9 meters which is the ideal distance.

  The compactness of the means for rotating and locking the transverse carriage also makes it possible to

  given the small vertical footprint given to both

  transverse and longitudinal, respectively, of

  put the upper face 22 of the longitudinal carriage 8 to

  a distance b from the ground of between 1.1 and 1.2 meters.

  Given the height of the means 70 necessary to maintain the tools to be sharpened, the work area is

  located at a distance c from the ground (fig.9)

  1.25 and 1.5 meters and, preferably, 1m, 35.Grace this, when the operator is in front of the machine, the distance between his eye and the task is of the order of Om, 35 , that is to say substantially corresponds to the most

  comfortable for his ocular perception, without his having to

  careful to look, as is the case now.

  Figures I to 3 show that the means

  the longitudinal displacements of the carriage 8 are constituted

  killed by two wheels 23a and 23b, arranged on both sides

  trolley, and near the anterior edge

  the two wheels are arranged in front of the

  two other flying 24a and 24b commanding the displacements

  7.These control means are thus within easy reach of the operator, regardless of the angular position given to the two carriages. The longitudinal carriage has, at its free end

  previous, a bearing 25 in which is mounted with possibility

  adjustment, both vertical and

  26a of a bent rod whose horizontal branch

  Zontale 26b supports an elbow support 27, adjustable in position

  This elbow support, which can thus occupy various

  angular or vertical positions with respect to the face

  22 of the longitudinal carriage 8, allows the operator to

  to place his elbow while performing operations

  requiring manipulation of the tool during its

floor.

  Pin 6 forms a block with its variable speed drive motor. It is mounted with the possibility of angular adjustment around a horizontal axis y'-Y relative to a support 30.The latter is itself mounted with possibility of angular adjustment around a vertical axis zz the free end of an arm 52 carried by the column 4.This arm is also mounted with the possibility of angular adjustment around the axis ver cal v'-v of the

  column 4.The vertical plane containing the revolving axis v'-v

  the column and the x1-x vertical axis of rotation of the transverse carriage is also the transverse vertical median plane of the frame 2 and the machine. As shown in more detail in FIG. 4, the motorized spindle 6 is secured to a base 33 which, provided with a graduation 34, can pivot in a bore 35 provided in FIG.

  the end of the support 30. This base is wedged in

  tation by a threaded rod 36 which is secured and whose end through the rear surface of the support

  receives a locking nut 37. This support 30 is itself

  linked to a base 38 mounted freely in rotation with

  depositing bearings 39 on a vertical shaft 40.

  The lower end of this shaft is supported at 40a and rests, with the interposition of a thrust bearing 42

  on the underside of the base 38 above.

  upper mite, which passes through the free end of the arm 52, is threaded at 42b and cooperates with control means

  means constituted in this form of

  by a nut 43 connected to a control handle 44.

  When the nut 43 is actuated in the blocking direction, the shaft 40 is moved vertically and plate the base

  38 against an intermediate ring 45 freely mounted in black

  on him and coming to bear against the inferior face

  re-arm 32.This ring also carries the graduation

  46 marking the angular position of the sup-

  port in combination with a mark carried by the base 38.

  The posterior end of the arm 32 is art-culled

  turn of a vertical shaft 50, which is mounted free of rotation

  with appropriate bearings in a

  piece 5n, attached to the end of column 4 of the batit.The

  lower end of the shaft 50 is supported mn 50a and is supported, with the interposition of a thrust bearing 53 on

  the underside of the aforesaid piece 52

  The top of this shaft passes through the bra 2 and has a threaded end 54 intended to cooperate with means

  control of the blockage constituted in this form of

  by a nut 55 secured to a control arm 56.

  The shaft 50 is wedged in rotation relative to the arm 32 by a screw 57. When the control arm 56 'is operated in the blocking direction, the rear end of the arm 52 is pressed onto a ring 58 interposed between it and the pie 52 ... nearblocking and when the arm is pivoted, the bending ring com.runiqué com.runicated to the rear part of the arm by the weight of the organs arranged at its end lC anterior, is compensated by a roller 60 rolling on the

  upper face of the ring 58 above.

  Preferably, and in order to facilitate the adjustments of the machine, the arm 32 comprises means which, whatever its angular position, maintain in the same

  relative position one of the elements of the graduation indi-

  as the angular position of the motorized spindle 6 around

  of the z'-z axis with one of the elements of the graduation indi-

  the angular position of the carriage around the vertical axis

  tical x'-x. In the embodiment shown in FIGS.

  means are constituted by a flexible link, such as a leaflet

  metal lard or cable 62, forming a mouth around respectively of the ring 45 and the piece 52, link whose ends, dals gorges respectively 63 and 64, are fixed by screws 65 and 66. Uin tensioner 67 , has in the middle of the arm 52, and accessible from the outside,

  adjusts the tension of this link 62. Thanks to this

  FIG. 7, when the arm 52 is brought from the position A to the position B or to the reference key position 71 corresponding to the zero of the graduation 46 of the ring 45, still retains the same orientation with respect to its hinge axis, that is to say remains in a vertical plane Pr P1, PF "1, which is always parallel to the vertical median plane P of the machine, plane containing the marker 72 for the graduation 7 of the marking of the sngular position of the Ao cross slide

  As shown in Fig. 1, the means of movement

  tical column 4 are constituted by a screw assembly Z5-nut 76 which is disposed between the vertical axis v'-v of the column and the vertical axis x'-x of rotation of the carriage 7. More precisely, the screw 75 is connected in rotation to a gear reducer 77, itself driven by an electric motor not shown, while the nut 76 is wedged at the end.

  of an arm 78 protruding laterally at the end

  column 4-.Thanks to their arrangement, these

  means of training considerably limit the

  dance tilting on the front communicated to the column by the weight of the elements that support the arm 52. The tree

  the electric motor driving the gearbox 77 is pro-

  along each of its ends by rods 80 which, as shown in Figure 2, each pass through the walls

  corresponding sides of the frame 2 to receive a vo-

  Maneuvering 82.The use of two steering wheels

  on both sides of the frame, allows the operation

  to make all its manufacturing adjustments while remaining on the same side of the machine,

  necessary to move too much.

  The blocking control means of the support 50 by

  relative to the arm 32, the support 30 with respect to the colon-

  No. 4 and the carriage 7 relative to the console 10, means

  which, in the previous forms of execution, are

  killed by a nut actuated by a radial lever, can

  may also be constituted by pneumatic means

* of which a form of execution is represented at the end

  6. These means consist of a cylinder 85

  able to be fixed on the corresponding part of the

  China and for example, at the posterior end of the arm

  32.This cylinder is divided into two compartments,

  86 and 87 by a waterproof membrane 88. The chamber

  86 is connected to an air source comprinmé, a pipe leading to the orifice 89.The chamber 87 contains a piston 90 which is attached by screwing on the threaded end of the corresponding control shaft

  and, for example, on the end 54 of the control shaft 50

  the elastic block of the rotation of the arm 32.C2 spring washers, type "Belleville", taking support, on the one hand,

  on the bottom of room 87 and, on the other hand, under

  your 90, tend to constantly flatten it against the

membrane 88.

  When the chamber 86 is supplied with compressed air, the membrane 88 transmits the pressure it receives to the piston 90 which compresses the washers 92 and, by controlling

  the downward movement of the shaft 50 causes the unlocking

  arm cage 32.At the opposite, as soon as the chamber 86 is no longer supplied with compressed air, the washers 92 become predominant and ensure by themselves the blockage of

  50. This provision guarantees the blocking of the

  machines in the event of a power failure

compressed air.

  These control means, which can be arranged on the shaft 50, on the shaft 40 or on the shaft 13 for locking the carriage, are advantageously actuated from the control box 20. Under these conditions, all the means

  control and adjustment of the machine are within

  mediate of the operator, which therefore does not need to

  place, both for setting operations and for

sharpening operations.

  Figures 8 to 11 show that the structure

  the means carrying the spindle, the arrangement in

  over the trolleys, the realization of dual control for the essential adjustment movements and the use of a control box articulated at the end of a lever

  give the machine parts an infinite

  nity of relative positions, but especially to adapt these positions, on the one hand to the work to be done and on the other hand to the morphology of the operator, whether the operator is valid or disabled, right-handed or left-handed, and he wishes to work standing or sitting. Thus, when the machine is in the position shown in FIGS. 8 and 10, the operator can actuate the tool holder 70 with his right hand while having on his left the control box 20 and the flywheel 23a longitudinal displacement, while, when the machine is in the position shown in :: firoures 9 and 11, the operator can operate the tool holder 70 of the left hand having, on his right, the boot 20 and the steering wheel 25b.By the way, in these positions, and thanks to the relative arrangement of the elements, the working area is located substantially 1.35 meters from the ground and 0.35 meters from the eye of the operator , that is, to a

  place allowing the operator to control the opsra-

  in progress without having to lean sideways or transversely, which reduces fatigue, tension

  nervous and increases its productivity.

  It should be noted that a large part of these advantages can be obtained with a simplified machine at

  means carrying the drive spindle of the grinding wheel.

  Indeed, that the machine is equipped, for reasons of a-

  lowering the cost price or specialization of the

  as in Figure 12, of a wheel head

  95 or like. in Figure 13, a motor spindle

  6 sée at the end of a cross member 96 pivoting relative to the column 4, the other features of the invention remain and thus allow to obtain the

same results.

-REVLDICATIONS-

  -1- Lachine to be sharpened universally and ergonomically

  type consisting of a frame (2) carrying a carriage (7) orienta-

  transversely displaceable wand on which is disposed a longitudinally movable carriage (8) adapted to receive holding means and to position tools for afferting, a vertical column (4), adjustable in height and carrying a grinding spindle (6), and adjusting means

  the angular position of the longitudinal axis of the bro-

  characterized in that the hinge bearing (9) of the transverse carriage (7) around the vertical (x'-x), on the one hand, is arranged cantilever relative to the frame (2 ) in a semicircular console (O10) protruding at the front thereof and constituting a receptacle of cutting products and protector legs of the operator and other

  on the other hand, is traversed by means (13)

  means of the carriage, / whose portion protruding from the console bearing form for one end of a lever (19) whose free end, protruding from the console, supports an articulated control panel (20), while the upper plane (22) of the longitudinal carriage (8) is located at a

  distance of between 1.1 and 1.2 meters from the ground,

  re that the work area is away from the ground

  between 1.25 and 1.5 meters, and preferably

1.35 meters.

  2-Sharpening machine according to claim 1, characterized

  characterized in that the block-forming grinding spindle (6) with its variable speed drive motor is mounted with the possibility of angular adjustment about a horizontal axis (ZL) on a support (30), itself even mounted with possibility of angular adjustment around a vertical axis (z'z) at the free end of an arm (52), arm whose other end is mounted on the column (4) of the frame (2) with possibility of angular adjustment around a

vertical axis (v'-v).

  3-Sharpening machine according to one of the recom-

  1 and 2, characterized in that the carriage lon-

  gitudinal (8) has, at its front end, a bearing (25) for a bent rod whose vertical leg (26a)

  is adjustable in height and orientation, and whose

  horizontal chute (26b) supports an elbow rest (27) of adjustable position.

  4-Machine according to any one of claims 1

  at 3, characterized in that the reference (71) of one of the marking means indicating the angular position of the spindle support (30) about a vertical axis (z'-z) is realized on

  a ring (45) which, after unblocking and pivoting at the end,

  mity of the arm (32) of the column, is connected to the means the now, regardless of the angular position of the arm, in the same relative position with the reference (72) of one

  means for locating the angular position of the chain

  transverse riot (7) around a vertical axis (x'-x).

  -Machine according to claim 4, characterized in that

  that the ring (45), on the one hand, is arranged between the end

  free arm (32) and a bearing (38) connected to the support of

  pin (30), on the other hand, is freely rotatable

  turn of a shaft (40) whose stepped lower end supports said support, and whose upper end passes through the arm and cooperates with control means

  the rotational locking of this support and more, is soli-

  of a link (52) which, enveloping it-at least partially

  is secured to a part (52) connected to the column (4).

  6-Machine according to claim 5, characterized in that the piece (52) integral with the column (4) and to which

  is the link (62), constitutes a landing for a vertical tree

  cal (50) linked in rotation to the arm (32), but free in transla-

  tion, and whose shoulder lower end bears under the above-mentioned part, while its upper end cooperates with rotational locking control means

arm on the column.

  7-Machine according to claim 1 and any one

  Claims 2 to 6, characterized in that the means

  of locking in rotation of the transverse carriage (7) are con-

  staggered by a vertical shaft (13) passing through the base (15) and the bearing (12) of this carriage, whose lower end cooperates with locking control means, and whose upper end shouldered transmits to the base (15) the traction force of the control means, said base (15) being mounted free to rotate with respect to the bearing (12) by means of a bearing ('16) whose inner ring adjusted with the possibility of sliding on the bearing (12), bears against a resilient spring washer (17) able to move it to move the base ('15) away from a bearing face of the bearing, as soon as the action of the means of

blocking control.

  8-iMachine according to claim 1, and any one

  Claims 5 to 7, characterized in that the means

  blocking control consists of a pneumatic cylinder

  the cylinder (85) contains a sealed membrane (88) delimiting a chamber (86) adapted to be connected to a source of compressed air and another chamber (87) containing a pistol, screwed to the end of . the tree

  corresponding shoulder, is maintained in support of the

  brane by elastic return washers (92) interpolated

  between this piston and an inner bearing surface of the cylinder

  dre. 9-I: achine according to claim 1 and any one

  Claims 2 to 8, characterized in that the means

  controlling the longitudinal displacement of the upper carriage (8) are composed of two flywheels (23a-23b) which, arranged on both sides of the transverse carriage (7), close to the front edge thereof and in front of the two flying wheels (24a-24b) controlling the movements of the latter

  trolley, are within easy reach of the operator.

  O10-Machine according to claim 1 and any one

  than claims 2 to 9, characterized in that the

  screw (75) controlling the vertical movements of the colon

  ne (4), is disposed laterally thereof, between the latter and the axis (x'-x) of rotation of the carriages (7 -.), and cooperates with

  a nut (70) wedged at the end of a radial arm (78), so-

  lidaire of the lower end of the said column.

  11-iIachine according to claim 10, characterized in that the screw (75) controlling the movement of the spindle is rotatably connected via a reducer (77) to an electric motor whose shaft is extended at each of its ends by a control rod (80),

  integral with an operating wheel (82) in its de-

  passing laterally from the corresponding wall of the frame (2).