FR2743744A1 - RECIPROCATING SAW WITH VARIABLE ADJUSTABLE CUTTING WIDTH - Google Patents

Abstract

In said saw (1), an adjusting drive (6, 6 '), respectively assigned to sawing groups (4, 4'), is mounted on a frame (2). An electronic control (19) of the adjustment drives (6, 6 ') detects the considered position of said groups (4, 4'), by means of a position indicator (7, 7 '), and positions said groups (4 , 4 ') on pre-established setpoint positions, by activating said drives (6, 6').

Description

RECIPROCATING SAW WITH VARIABLE ADJUSTABLE CUTTING WIDTH

  The present invention relates to a reciprocating saw

  with cutting width with variable adjustment.

  Reciprocating saws of this type have, in known manner, a frame on which a saw frame is mounted with reciprocating drive in a vertical plane. Two sawing groups, respectively provided with a large number of saw blades extending vertically, are in turn located on

  this saw frame. To adjust the cutting width, i.e.

  say the free space between the two sawing groups, these

  niers are respectively mounted, on the frame, with faculty

  adjustment transversely to the direction of travel-

  of the material to be sawed.

  In known reciprocating saws, the adjustment of the cutting width is carried out manually and it comprises simple

  selector switches for direction indication

  of the movement of the width adjustment trolleys. Habi-

  an adjustment lever must be actuated until

  that the adjustment carriage assigned to the saw groups has

  dyes the desired position. The latter is communicated to the operator via a display, for example

a counting mechanism.

  Adjusting the cutting width of reciprocating saws

  known, however, has various drawbacks. So the ac-

  manual operation proper is not very ergonomic and is

  full of errors. In addition, the process can be carried out only with relatively low adjustment speeds,

  which results in setting times reaching typical-

  up to 10 seconds, resulting in a noticeable decrease in

  ment of known reciprocating saws. A far from neglected aspect

  geable consists in that the known reciprocating saws cannot be integrated into priority data systems which can automatically deliver values of

  instructions for adjusting the cutting width.

  On the basis of this problem, the invention relates to a reciprocating saw of the aforementioned type, improved by

  so that the cutting width can be adjusted

  largely automatically, thus allowing

  quick and more precise adjustment of the cutting width with integrated

  possible integration in a priority data system.

  According to the invention, this object is achieved by the fact that adjustment drives, respectively assigned to the sawing groups, are mounted on the frame and are equipped with an electronic control. This detects the position in question of the sawing groups, by means of a position indicator, then activates the adjustment drives of said groups so that the latter are positioned on

  preset preset positions.

  Thus, the largely automated process of adjustment

  cutting width allows you to reach

  geuse, an acceleration of the operating sequence during sawing

  frame age. The fast movement of the saw groups is then made possible thanks to the design of the control under

  the form of a practically closed control circuit. Tolerances

  mechanical rances of the adjustment units are, in this case, cor-

  rigged automatically. As an additional advantage, it is worth mentioning a high accuracy of repeatability

  when adjusting the cutting width, and a possibility of

  terconnection of the reciprocating saw according to the invention to take advantage of a data system relating to proposals

cutting profiles.

  The invention provides structural features

  advantageous to the adjustment drive of the sawing groups.

  Thus, each adjustment drive intended for groups

  sawing weights may preferably have a drive motor

  drag mounted fixed on the frame and leading, via

  diary of a transmission, a shaft which is telescopic in the vertical direction and is in turn coupled, driven side, to adjustment pins assigned to the saw group considered,

  and extending transversely to the direction of travel-

  is lying. The position indicators can be conveniently produced in the form of rotation angle indicators which are installed, respectively, on the transmission intended for

  the telescopic shaft and arranged downstream of the drive motor

  ment. Clamping pieces, intended for saw blades and

  respectively located on the head side and on the base side, are preferably

  on each sawing group, the two pieces of

  clamping being mounted to slide transversely by

  relation to the direction of travel of the material to be sawn, on guides

  installed on the horizontal crosspieces of the saw frame

  ge, and can be animated by sliding through

  re respective adjustment pins which can be driven, in synchronism, by the telescopic shaft of the adjustment drive. Safety sensors are advantageously provided on the reciprocating saw, in order to detect whether a material to be sawed is located in the region of the frame of said saw and / or in the exit zone of the latter. This avoids false operations conditioned by the command, which is credited to the functional reliability of the reciprocating saw

automated.

  The development below concerns peripheral units

  Control risks that can be advantageously used, and the integration of these units in a priority data system.

  The control can be judiciously fitted with a

  data entry tee, to enter position values

of the saw groups.

  This control can also be equipped with a display unit, in order to display the values of the set positions and / or the values of the actual positions of the groups.

sawing.

  Said control can also advantageously be equipped with a program memorization unit, in order to memorize

  pre-established cutting programs.

  In addition, the control is preferably connected, via an interface, to a priority system of

  data and in particular to a measuring device assigned to the material

  sawn sawn, in such a way that, on the basis of the dimensional data

  of said sawn material, established by said measuring device, a fully automatic control of the position of the sawing groups takes place with integration, where appropriate,

  a corresponding cutting program.

  In addition, the control of the width adjustment

  cutting can be conveniently carried out in the manner of a command

  controlled by microprocessor and programmable by memory.

  The invention will now be described in more detail,

  title of example in no way limiting, with regard to the drawings an-

  attached to which: FIG. 1 is a schematic plan view of an automatic control reciprocating saw; and FIG. 2 is a view of the frame of the saw, observed

  in the direction of an arrow II in Figure 1.

  As an observation in FIG. 1 reveals, a reciprocating saw 1 proper has a frame 2 on which a sawing frame 3, directed vertically and transversely relative to the direction of travel D of a trunk to be cut, is mounted and back and forth by means of a corresponding drive,

  not illustrated. Two sawing groups 4, 4 ', respectively mu-

  nis a large number of saw blades (saw blades 33 in Figure 2) extending vertically, are arranged on the frame 3; with a view to adjusting the cutting width S, the sawing groups 4, 4 ′ are then respectively mounted on the frame 3,

  horizontally and with the ability to adjust (arrows 5 to dou-

  ble point) transversely to the direction of travel D. The precise structural arrangement of the frame 3, comprising the groups 4, 4 ′, will be the subject of a more detailed comment in support of FIG. 2. Related with FIG. 1, it will only be observed that there is also provided, on the frame 2, an adjustment drive which is respectively designated by

  6, 6 ', as a whole, and includes respective indicators

  tifs 7, 7 'of angles of rotation of the sawing groups 4, 4'.

  Two pairs of feed cylinders are also provided on the frame 2, respectively on the inlet side 8 and on the outlet side 9, FIG. 1 respectively highlighting the cylinders

  upper feeds 10, 11 of said pairs. Just like the cy-

  lower feeders occupying exactly underlying positions in the viewing direction, the cylinders

  feed superiors 10, 11 are driven around an axis of ro-

  tation 12, 13 placed horizontally and transversely by

  relation to the direction of travel D; in this case, the cylinders su-

  periorals 10, 11 can be moved down towards the lower cylinders 10, 11, from a raised neutral position, by means of a suitable drive. Round timber of different thicknesses can thus be conveyed through the reciprocating saw 1 in the running direction D. A "splitting wedge 14", contiguous to the outlet side 9 of the reciprocating saw 1, comprises two panels of guide 15, 16 arranged vertically and parallel to the direction of travel D, as well as guide cylinders 17, 18 installed outside said panels. The central part of a round wood, cut in saw 1, is routed between the two panels 15, 16,

  while the peripheral marginal regions of the wood, if-

  killed on the left and on the right, enter the gap between

  the outer faces of the guide panels 15, 16, and the cylinders

  guide dres 17, 18 resiliently biased against these

  nières. Said cylinders yield elastically towards the outside

  laugh and similarly guide these marginal regions in the direction of travel D, which provides correct counter-support to the

  round wood to be sawn. For the rest, the structural arrangement

  splitting wedge 14 fully corresponds to the state of the art, so that more detailed comments on this

regard are superfluous.

  As further shown in FIG. 1, a control 19 programmable by memory and assigned to the reciprocating saw 1 is connected, via signal lines 20, 20 ′, to the indicators 7, 7 ′ of angles of rotation adjustment drives 6, 6 '. These are connected to the control 19 in a manner explained in more detail below, by means of corresponding control conductors 21, 21 '. The control 19 is also connected, by means of an additional conductor 22 ', to a data input unit 22 which is integrated in a central control station 23 equipping the saw

  1. In addition, via an interface 24, a connection

  xion is established with a priority data system (not

present).

  Before commenting in more detail on the function of the

  request 19, it should be explained, in support of FIG. 2,

  the structural arrangement of the saw frame 3.

  The saw frame 3 consists of a horizontal cross

  upper plate 25, of a lower horizontal crosspiece 26 (extending, both, transversely with respect to the direction of travel D), as well as of two lateral vertical crosspieces 27, 28. The upper and lower crosspieces 25, 26 carry the two sawing groups 4, 4 ', structured and mounted

  identically. This is why the structured organization

  relle of these groups is explained by considering only the case of group 4 located on the left vis-à-vis Figure 2. The

  identical component parts of group 4 'on the right are

  characterized by similar numerical references, affected

tées however of the sign "prime".

  The sawing group 4 comprises a clamping piece 29 located on the head side and a clamping piece 30 located on the base side, between which a large number of saw blades 33 are embedded with respective clamps 31, 32 turned towards each other. The sawing tension is absorbed,

  in this case, by the vertical crosspieces 27, 28.

  The clamping parts 29, 30 are mounted to slide-

  ment, horizontally and transversely to the direction

  scrolling D, in respective guides 34, 35. A slide-

  ment of sawing groups 4, 4 ′ along these guides 34, 35 makes it possible to adjust, at the same time, the absolute dimension of the cutting width S defined by the distance between the two saw blades 33, 33 ′ occupying interior positions; and the cutting position with respect to the longitudinal median plane of the reciprocating saw. The synchronous movement of adjustment of the clamps 29, being part of a group 4, 4 'considered, is each time caused by adjustment pins 36, 37 with which said pieces 29, 30 are engaged. Synchronous rotation of the pins 36, 37 is caused by the adjustment drive 6 mentioned in the introduction. The latter is equipped with an asynchronous motor 38 with three-phase current occupying a fixed position on

  the frame 2 above the saw frame 3 and coupled, via the

  median of a transmission 39, to a telescopic shaft 40 in

  the vertical direction. This tree 40 has a sheath 41 ac-

  coupled to the transmission 39, in which is guided a rod 42 whose rotation is prohibited, but whose sliding is however authorized in the vertical direction. Said rod is coupled by its end remote from the sheath, by means

  of a joint 43, to a transmission 44 for deflection

  vation which is located on the upper horizontal cross member and is coupled on the driven side, on the one hand, to pin 36 of

  adjustment of the clamping piece 29 located on the head side and,

  be part, to a connecting shaft 45 extending downward in the

  extension of the telescopic shaft 40. The lower end

  re of the connecting shaft 45 is coupled, via another return transmission 46, to the pin 37 for adjusting the

  clamp 30 located on the base side.

  Following the integration, thus explained, of the tree

  lescopique 40 between the adjustment drive 6 secured to the frame, and the saw frame 3 performing back and forth in

  in the vertical direction, said shaft 40 can, on the one hand, reflect

  cut a torque and, on the other hand, compensate for the shift

  height in height of said frame 3 which is symbolized in FIG. 2,

by mixed lines.

  The operating mode of the reciprocating saw 1

  according to the invention is commented below.

  The considered position of the sawing groups 4, 4 ', which

  determines the cutting width S, can be detected by the

  indicators 7, 7 'of angles of rotation on the transmissions 39, 39'. By means of the data entry unit 22, an operator can now signal, to the command 19, that another cutting width S. should be adjusted. The command 19 consequently puts the motors 38, 38 'in movement, so that the groups 4, 4' are moved by means of the transmission coupling described above. The travel path is picked up by the indicators 7, 7 ′, so that the set position of the

  groups 4, 4 'can be precisely initialized by the com-

  command 19. The set cutting width entered or, respectively

  the corresponding setpoint coordinates of the

  groups 4, 4 ', can then be displayed on a display unit

  plug 47, in control station 23, in the same way as

  the actual considered positions of said groups 4, 4 ′.

  As can be seen from an observation in FIG. 1, the controller 19 can be equipped with a program storage unit 48 in which preset cutting programs are stored, and can be called up via the data input unit 22. By means of interface 24, it

  is also possible to activate the external control-

  ment, for example from a measuring device assigned to the sawn material; so, based on dimensional data

  of the material considered to be sawn, established by the provision

  When measuring, fully automatic control of the position of groups 4, 4 'can take place with integration, the

  if necessary, a corresponding cutting program.

  It should also be mentioned, for the sake of completeness-

  of, that the control is connected to safety sensors 49,, 51 via signal lines 52, 53, 54. The two sensors 49, 50 consist of limit switches which detect, each time , the upper position of abutment of the upper advance cylinders 10, 11. If the latter occupy said upper position, this means that no material to be sawn can be conveyed through the reciprocating saw 1, which then allows a movement of the sawing groups 4, 4 'without any danger. Consequently, the control 19 only comes into effect when it is signaled, via the two sensors 49, 50, that the two cycles

  lindres 10, 11 occupy their passive position.

  The safety sensor 51 is formed, at the outlet of the

  splitting wedge 14, by a photoelectric barrier which monitors

  the, in the region of said corner, the possible presence of a material

  riau to saw. If so, safe movement

  sawing groups 4, 4 'is impossible, so that the

  command 19 remains inactive in the presence of a corresponding signal

from said sensor 51.

  It goes without saying that many modifications can be made to the saw described and shown, without departing from the

part of the invention.

Claims (10)

-R E V E N D I C A T I ONS-   1. Reciprocating saw with cutting width with variable setting   ble, characterized in that it comprises a frame (2); a saw frame (3) capable of reciprocating in a vertical plane on said frame (2); two sawing groups (4, 4 ') located on said frame (3) and respectively provided with a large number of saw blades (33) extending vertically, said groups (4, 4') being respectively mounted, on said   frame (3), with the possibility of adjustment transversely in relation   port in the direction of travel (D) of the material to be sawn, for re-   setting the cutting width (S) of the saw; a respective adjustment drive (6, 6 ') mounted on the frame (2) and intended for sawing groups (4, 4'); and an electronic control (19) which is assigned to the adjustment drives (6, 6 '), detects the considered position of the sawing groups (4, 4') by means of a position indicator (7, 7 '), and positions said groups (4, 4 ′) on preset preset positions, by   activation of said drives (6, 6 ').   2. Reciprocating saw according to claim 1, character-   laughed at by the fact that each adjustment drive (6, 6 ')   intended for sawing groups (4, 4 ') has a drive motor   drag (38, 38 ') fixedly mounted on the frame (2) and leading, via a transmission (39, 39'), a shaft (40, ') which is telescopic in the vertical direction and is at its turn coupled, driven side, to adjustment pins (36, 36 ', 37, 37') assigned to the sawing group considered (4, 4 '), and extending transversely with respect to the direction of travel (D) .   3. Reciprocating saw according to claim 2, character-   laughed at by the fact that the position indicators are produced in the form of indicators (7, 7 ') of rotation angles which are installed, respectively, on the transmission (39, 39') intended for the telescopic shaft ( 40, 40 ') and arranged downstream of the drive motor (38, 38 ').   4. Reciprocating saw according to claim 2 or 3, characterized in that the clamping pieces (29, 29 ',   , 30 '), intended for saw blades (33, 33') and respective-   located on the head and base side, are provided on each sawing group (4, 4 '), the two clamping pieces (29, 29', 30, 30 ') being slidably mounted transversely to the direction of travel (D) material to be sawn, on   guides (34, 34 ', 35, 35') installed on the horizontal sleepers-   blades (25, 26) of the saw frame (3), and which can be moved by sliding by means of the respective pins of   adjustment (36, 36 ', 37, 37') that can be driven, in sync   nism, by the telescopic shaft (40, 40 ') of the drive adjustment (6, 6 ').   5. Reciprocating saw according to any one of the claims   cations 1 to 4, characterized by safety sensors (49, 50, 51) designed to detect whether the material to be sawed is in the region of said saw and possibly, or alternatively, in its exit area.   6. Reciprocating saw according to any one of the claims   cations 1 to 5, characterized in that the control (19) is equipped with a data input unit (22), in order to enter the values of the set positions of the sawing groups (4, 4 ') .   7. Reciprocating saw according to any one of the claims   cations 1 to 6, characterized in that the control (19) is   equipped with a display unit (47) in order to display the values   their setpoint positions and possibly, or in-   the values of the effective positions of the groups of sawing (4, 4 ').   8. Reciprocating saw according to any one of the claims   cations 1 to 7, characterized in that the control (19) is equipped with a program storage unit (48), in view   to memorize preset cutting programs.   9. Reciprocating saw according to any one of the claims   cations 1 to 8, characterized in that the control (19) is connected, via an interface, to a priority data system and in particular to a measuring device assigned to the sawn material, so that, on the basis of   dimensional data of said sawn material, established by the-   Said measuring device, a fully automatic control of the position of the sawing groups takes place with integration, if necessary, of a corresponding cutting program.   10. Reciprocating saw according to any one of the res-   dications 1 to 9, characterized in that the control (19)   is carried out in the manner of a micropro- controlled command   stopper and programmable by memory.