FR2560080A1 - PUNCHING MACHINE, IN PARTICULAR FOR PERFORATING OR CUTTING BOXES OR BOXES - Google Patents

Abstract

THIS PUNCHING MACHINE INCLUDES A DIE HOLDER TABLE 5, TOOLS CONSISTING OF A PUNCH 10 ACTUATED BY A CYLINDER AND A DIE 9, AND A DETACHING DEVICE. ACCORDING TO THE INVENTION, THIS DEVETISSEMENT DEVICE 20, 22, 23, 24 IS MOBILE MOUNTED ON THE HEAD 4 OF THE PUNCHING MACHINE INDEPENDENTLY OF THE PUNCH 10 AND IS ABLE TO MOVE INDEPENDENTLY OF THIS PUNCH 10 BETWEEN A REST POSITION IN WHICH IT RELEASES AN IMPORTANT PASSAGE BETWEEN THE MATRIX 9 AND ITS LOWER PART 22 AND A WORKING POSITION IN WHICH IT FORMS WITH THE MATRIX 9 AN INTERVAL AT LEAST EQUAL TO THE THICKNESS OF THE MATERIAL TO BE CUT. MEANS ARE ALSO PROVIDED FOR TO SOLIDARIZE THE RELEASE DEVICE WITH THE CYLINDER ROD WHEN IT MAKES ITS ASCENT MOVEMENT.

Description

PUNCHING MACHINE IN PARTICULAR FOR PERFORATION

  OR WITH THE CUTTING OF BOXES

  The present invention relates to a punching machine intended in particular for perforating or cutting boxes or boxes but nevertheless allowing the cutting of sheet materials, of the type comprising a matrix-holder table, a tooling consisting of a punch actuated by a jack and a matrix, and a stripping device

  to separate the punch from the punched piece.

  Currently, known punch presses of this type generally comprise a fixed die-holder table whose dimensions are proportional to the largest cutting section that can be obtained. Therefore, it is not possible to perform on these punching machines small section punching boxes also presenting

  small dimensions and the range of use of these machines is reduced.

  Usually, the stripping device is connected to the punching tool and it is necessary to provide a spring mechanism

  a complex structure to push against the piece to cut.

  In particular, it may be of the type comprising a crown placed

  centrally around the punch and pushed by a spring mechanism against the workpiece. The punches are then of a very complex and expensive structure; especially since it is often necessary to

  provide a special stripping device for each punch.

  In other punching machines, a fixed counter-matrix is placed above the die so as to provide an interval between the two.

  corresponding to the thickness of the material to be cut, this counter

  matrix allows only the passage of flat parts of a certain

  thickness and cutting of cases is not possible.

  The protection of the danger zone is generally ensured by a fixed housing, preventing the passage of fingers and allowing the passage of only flat parts and therefore no boxes, or by a screen that the operator lowers or raises, in this case the operator must maintain

  the casing in a safe position for the duration of the punch cycle-

  swims while keeping the workpiece in position.

  The object of the invention is to remedy these drawbacks and in particular to provide a punching machine, of the aforementioned type, for perforating or cutting both flat parts and boxes

  or boxes while being simple and inexpensive design.

  This goal is achieved in that, in the punching machine according to the invention,

  which is of the aforementioned type, the stripping device is movably mounted on the head of the punching machine independently of the punch and in that it is able to move independently of the punch between a rest position in which it releases a significant passage between the matrix and its lower part, and a working position in which it forms with the matrix an interval at least equal to the thickness of the material

to cut.

  Advantageously, the stripping device being in its working position, means are provided for securing this device

  stripping at the cylinder rod when the cylinder moves

  lift to bring the punch to its rest position.

  Thus the descent of the stripping device can be controlled

  deed, for example manually, independently of that of the punch, so as to control the descent of the punch only when the piece to be cut and the stripping device are in place,

  while the recovery of this device can be carried out automati-

  at the same time as the raising of the jack rod carrying

the punch.

  Advantageously, also, for the punching of sheet materials, means are provided for stopping the rise of the rod of the jack, when the punch which is secured to this rod is clear of the punched piece and arrives substantially at the bottom portion. the stripping device, the latter remaining in its position

working.

  In this way, the punch returns sufficiently that the perforated piece can be released (since, in its working position, the stripping device forms with the matrix an interval at least equal to the thickness of the material to be cut) and the Punching cycle is shortened since the simultaneous recovery of the punch and the device

  stripping to their rest position is thus removed.

  According to a preferred embodiment of the present invention, the stripping device comprises a carriage fixed on two vertical columns, these two columns being slidably mounted in a flange integral with the cylinder body, and a stripping plate removably mounted to the lower end of the two columns, a coach

  being associated with each of the columns for moving the carriage. -

  The stripping plate can therefore be mounted very quickly and easily changed depending on the dimensions of the punching to be performed

  and / or the thickness of the piece to be cut.

  In order to immobilize the stripping device in the rest position, a cam integral with the jack rod is associated with each driver, each driver being in abutment on the associated cam when

  the stripping device is in its rest position.

  Advantageously, each trainer is formed by a plate provided with two holes whose diameters respectively correspond to that of the associated column and cam, this plate being supported by its rear part on the upper face of the carriage by means of a spring. associated compensation and being threaded by its hole on the associated column, a spring is associated with each driver and is mounted between the upper face of the carriage and the associated trainer, the front portion thereof, each spring requesting the coach associated up, and a U-shaped lever is pivotally mounted by each

  of its branches on an axis linked to the carriage, this lever being provided on each

  one of its branches of a teton associated with one of the coaches, each teton being able to lower the associated coach when a push towards

the bottom is exerted on the lever.

  Thus each trainer is normally pushed upward at its front by the spring associated with it and therefore has an oblique position relative to the horizontal; it is therefore in abutment against the associated cam, the hole corresponding to it being

offset from it.

  When a downward thrust is exerted on the lever, the nipples of it cause the lowering of the associated trainer, the hole corresponding to the associated cam is then in front of it, the coach is thus released from the associated cam and the lowering of the stripping device to its working position

  can be performed by pressing the lever.

  Advantageously, to perform the locking in the working position of the stripping device, a pivotally mounted latch is associated with each column, each latch being biased by a spring and being able to pivot and to be housed under the effect of this spring in

  a corresponding groove of the associated column.

  Advantageously also, a rocker is associated with each lock, each rocker being able to cause the pivoting of the associated lock, that is to say the unlocking of the column associated with this lock, when

  the punch arrives at the level of the stripping plate during its

  climbing. As a result, since the trolley of the stripping device is no longer locked, and its drivers being in abutment against the associated cams secured to the jack rod (since no thrust is exerted on the operating lever), the device stripping back

automatically with the punch.

  Each rocker is associated with a cam integral with the cylinder rod, each cam being able to push the associated rocker in a retracted position during the lowering of the cylinder rod and to push it into a position in which it causes the pivoting of the cylinder. associated lock and thus the unlocking of the associated column, when

  the rise of the cylinder rod.

  Advantageously also, a protective casing is linked to the lever

  control of the trolley of the stripping device. This protection casing

  tion is thus mobile and moves with the carriage from a rest position in which it allows the passage of bulky parts, in a working position where it protects the operator of the punching zone

dangerous.

  The work position of this casing is ensured by

  operator, while returning to the rest position automatically

  with the rise of the punch. This housing can also be

  tilted back to free a larger passage.

  In any case the invention will be well understood and other characteristics

  characteristics will be highlighted with the following description

  with reference to the attached schematic drawing showing by way of non-limiting example a preferred embodiment of this punching machine - Figure 1 is a side view, - Figure 2 is an enlarged scale view similar to Figure 1, showing the detail of the head of the punching machine, - Figure 3 is a front view, the punch and the stripping plate being both shown in the rest position, then the stripping plate in the working position and the punch in the process of descent; FIG. 4 is a top view with a half section along 4-4 of FIG. 3,

  - Figures 5 to 8 are schematic views showing the differences

  the positions of the stripping plate and the punch during

Punching cycle.

  As shown in FIG. 1, the punching machine (2) according to the invention

  comprises a frame (3) comprising two branches, a top branch (3a) of gooseneck whose free end constitutes the head (4) of the punching machine, and an inferior branch (3b) in the shape of an anvil,

  and provided at its free end with a removable die-holder table (5).

  A rule (6) slidably mounted on a horizontal slide (7) allows the positioning of the pieces in the following horizontal plane

two orthogonal axes.

  The matrix support table (5) is provided with a hooking tab (Sa) adapted to engage in a complementary shaped housing (8) formed at the end of the lower branch (3b) of the frame (3). ). It is

  very easy and quick to assemble or remove the table

  matrix (5) and change it to suit the type of punching piece

  or the dimensions of the cut to be made.

  The matrix support table (5) further has a horizontal bearing surface (5b), square in the example of the drawing, and projecting relative to the hooking tab (Sa). This surface (5c) is provided with two pins (5b) arranged on opposite angles, for the positioning and quick fixing of a matrix (9) complementary to the punching tool or

punch (10).

  Punching and stripping devices are mounted

  on the head (4) of the punching machine.

  The punching device essentially comprises a jack

  vertical arrangement (11) and a punch (10) mounted at the end

  free mité of the rod (12) of the cylinder (11). The correct positioning and locking of the punch (10) on the cylinder rod (12) is ensured by means of a locating and locking finger (13) engaging

  in an associated hole (not shown) of the punch shaft (10).

  A horizontal guide plate (14) is also attached

  at the free end of the cylinder rod (11), concentrically therewith.

  A vertical pin (15) is fixed on the guide plate (14) at each of its lateral ends, on either side of the cylinder rod (11). The two pins (15) extend upwardly from the guide plate (14) and are each provided with two cams

  (16,17) whose role will be explained later.

  The cam (16) is constituted by a cylindrical bulge of the spindle (15) formed at the upper end thereof. The cam (17) is constituted by a frustoconical bearing surface flaring downwards and formed in the lower part of the spindle (15). The guide plate (14) is slidable along two vertical columns (20) placed on either side of the jack (11), by means of two bores (14a) of the same diameter as these columns (20). arranged at each of its lateral ends. Each column (20) is disposed rearward (i.e. on the left in FIG.

  relative to the spindle (15) located on the same side of the jack (11).

  The two columns (20) are themselves slidably mounted in a flange (21), integral with the jack (11) and having two bosses (21a) for their guidance, and are joined at their upper part by

  a carriage (23) fixed on each of them.

  A latch (35), formed by a plate provided with a notch (36) semi-circular and pivotally mounted on an axis (37), is associated

at each column (20).

  Each lock (35) is able to engage, under the effect of a spring

  with a blade (38) in a groove (20a) formed in the associated column (20).

  A latch (39) is associated with each latch (35).

  Each rocker is mounted on a leaf spring (40) integral with the latch (35) associated and can take two positions: - a first working position in which it is pushed by the cam (17) against the flange (21) and exerts on the latch (35) associated a force opposite to that exerted on it by the spring (38) and therefore tilts the latch (35) in its position, shown in Figure 4, in which it releases the associated column (20). ) - a second position in which it retracts under the action of the cam (17) and no longer exerts any effort on the latch (35) associated, it is then free to rotate and engage in the throat (20a)

  of the associated column (20) under the effect of its spring (38).

  A stripping plate (22) is removably mounted at the lower end of the two columns (20). Its locking on these columns (20) is obtained by means of fingers (19) engaging in transverse holes associated formed at the lower end of

each column.

  A driving plate or driver (24) is associated with each pair of spindle (15) and column (20), such pair being formed by a spindle (15) and a column (20) on the same side.

the cylinder (1).

  Each driver (24) is pierced with two holes (24a, 24b) allowing it to be spun on each pin (15) and each column (20) associated with it so as to rest on the upper face of the carriage (23). ). The hole (24a) has a diameter substantially equal to that of the column (20) in its upper part and the hole (24b) has a diameter substantially

  equal to that of the cam (16) of the spindle (15).

  A spring (25) is associated with each driver (24) and is mounted in an associated recess (23a) in the upper face of the carriage (23) in the front portion thereof (i.e. the part

  located on the right in Figure 2).

  Each spring (25) acts on the driver (24) with which it is associated

  and pushes it up against a stop (26) integral with the carriage (23).

  A compensation spring (27) is also associated with each driver (24). Each spring (27) is mounted on a column (20) between a flange (20b) (or the like) formed at the upper end

  of this column (20) and the upper face of the associated driver (24).

  In this way, each driver (24) is, in the rest position, inclined relative to the horizontal, its front portion (on the right in Figure 2) being raised above the carriage (23) by the spring (25). )

  while its rear part (left part in Figure 2) is

  milking kept pressed against the carriage (23) under the effect of the spring

compensation (27) associated.

  A U-shaped operating lever (30) is articulated by each of its branches on a pivot axis (31) fixed on each

side wall of the carriage (23).

  A protective housing (32), transparent material, is integral with the operating lever (30) and can rotate with it. This protective casing (32) can be moved by means of the lever (30) between a

  high position of rest (A) (in phantom in Figure 2) in the-

  it completely releases the punching device and allows the passage of large parts (boxes, boxes ...) and mounting

  different elements of the tools (punch, stripping plate ...

  etc.), and a low working position (C) in which it prevents any

  operator intervention at the punching area.

  A stick (33) is associated with each driver (24) and is fixed on the corresponding arm of the lever (30). Each of these nipples (33) is able to act on the associated driver (24) when the lever (30) pivots

from high to low.

  Figures 5 to 8 show schematically the different positions of the stripping and punching devices at different

  steps of the punching operation.

  At the beginning of this operation, the punching and stripping devices, that is to say the punch (10) and the stripping plate

  (22), are in their high positions (see Figure 5), the protective cover

  (32) being raised in its rest position A (in phantom in Figure 2). An important passage is then available between the matrix

  (9) and the stripping plate (22), the underside of which is sensitive to

  at the same level as that of the punch (10), and allows in particular to set up on the matrix (9) a housing or box to be cut. A first push on the lever (30) causes the lever to rotate downwardly about its axes (31) until it reaches

  the intermediate position B, in which the housing (32) is found to be sensi-

  vertically; the carriage (23) having not moved (see Figures 2 and 3), the driver (24) is then in its position shown in phantom in Figure 2, slightly inclined relative to the horizontal and abutting by the lower edge of its hole (24b) against the end of the first cam (16). As a result, the carriage (23) is immobilized in its position

rest.

  By pressing again on the operating lever (30), the drives

  neurs (24) are pushed down by the nipples (33), integral with the lever (30), and are thus released cams (16), which then pass

freely in their holes (24b).

  The carriage (23) can then be lowered as well as the housing (32) using the lever (30) to its lower position C shown

in full lines in Figure 2.

  The carriage (23) is locked in this low position by the latches (35) which pivot under the effect of their spring (38) about their axes (37) and are housed by their notch (36) in the groove ( 20a)

columns (20).

  The stripping plate (22) is then immobilized in its low working position (see Figure 6) at a distance from the die

  (9) at least equal to the thickness of material to be cut.

  The operator can then cause, by foot control for example, the descent of the cylinder rod (12) and consequently the descent of the punch (10) and the pins (15) integral with the guide plate (14). of the cylinder rod (12), so as to perform the cutting

  punching piece (see Figure 7).

  During this descent of the cylinder rod (12) and the punch (10), the cams (17), arriving at the level of the locks (35), push down the rockers (39) (see left part of FIG. Figure 3) and these, being mounted on leaf springs (40), dislodge; the latches (35) remaining in their position in which they lock the columns

(20).

  When the punching is complete, the punch (10) begins to rise, the stripping plate (22) still being in its working position and disengages from the cut piece held by the plate

stripping (22).

  When the underside of the punch (10) is approximately at the underside of the stripping plate (22), as shown in FIG. 8, the cams (16) push the struts (24) upwards. . Indeed, the drivers (24) are no longer biased downwards by the nipples (33) of the lever (30) are in their position shown in dashed lines in Figure 2, that is to say that they are inclined and no longer allow the passage of the cams (16) through their

hole (24b).

  As a result, the pins (15) tend to carry with them

  in their ascent the carriage (23).

  At about the same time, the cams (17) push the latches

  their (39) against the flange (21), which causes the pivoting of

  latches (35) associated therewith and removing them from the grooves (20a) of the

  nes (20). The columns (20) are then no longer locked, nothing prevents the movement of the carriage (23) and the latter, being secured to the punch (10) and the cylinder rod (12) via coaches (24) and cams (16) can then go up at the same time as the jack rod. The carriage (23) and the stripping plate (22) thus go up with the punch (10) to their rest position represented

in Figure 5.

  The cams (16) of the pins (15) push the drivers (24) while the columns (20) of the carriage (23) are still immobilized

  by the bolts (18) housed in their grooves (20a). The springs

  (27) are therefore compressed by the drivers (24) and thus make it possible to compensate for the difference in the displacement of the pins (15)

relative to the carriage (23).

  As soon as the columns (20) are unlocked, these compensating springs (27) return to their initial position. As a result, the displacement races of the punch (10) and the stripping plate

(22) are identical.

  Valve means (42) (see Figure 4) are also provided on the punching machine (2). These valve means (42) cause the exhaust of the hydraulic cylinder (11) when the rod (12) thereof

  is in the position shown in Figure 8, that is when the pointer

  (10) is raised, after punching, enough to be

  released from the perforated part, the stripping plate remaining fixed.

  As a result, the raising of the rod (12) of the jack is stopped, and a new punching cycle can be re-triggered as soon as a piece is in position on the die (9). Of course, these valve means are intended to be used only for punching

of flat pieces.

  They prevent the punch (10) and the stripping plate from going back to their rest position, shown in FIG. 5, and thus make it possible to appreciably reduce the duration of the cycle.

  of operation for punching flat workpieces.

  It goes without saying that the present invention is not limited to the single embodiment described above by way of non-limiting example, it encompasses all the embodiments of the invention.

  implementing equivalent means.

1 1

Claims (7)

- CLAIMS -   Punching machine intended in particular for cutting or perforating   enclosures or boxes, of the type comprising a table   die (5), a tool comprising a punch (10) actuated by a jack (11) and a die (9), and a stripping device for separating the punch (10) from the punched piece, characterized in the stripping device (20, 22, 23, 24) is movably mounted on the punch head (4) independently of the punch (10), and in that it is able to move independently of the punch (10). ) between a rest position in which it releases a large passage between the matrix (9) and its lower part (22) and a working position in which it forms with the matrix (9) an interval at   less equal to the thickness of the material to be cut.   2- punching machine according to claim 1, characterized in that, the stripping device (20,22,23,24) being in its working position, means are provided for securing this device of   stripping on the cylinder rod (12) when the cylinder moves   raising to bring the punch (10) to its rest position.   Punching machine according to claim 2, characterized in that, for punching sheet materials, means (42) are provided for stopping the raising of the rod (12) of the jack (11), when the punch (10) which is secured to this rod (12) is released from the punched piece and arrives substantially at the lower part (22) of the stripping device, the latter remaining in his working position.   Punching machine according to any one of the claims   I to 3, characterized in that the stripping device comprises a carriage (23) fixed on two vertical columns (20), these two columns (20) being slidably mounted in a flange (21) integral with the body   cylinder (11) and a stripping plate (22) removably mounted   at the lower end of the two columns (20), a driver (24) being associated with each of the columns (20) for moving the carriage (23).   - Punching machine according to claim 4, characterized in that a cam (16) integral with the cylinder rod (11) is associated with each driver (24), each driver (24) abuts on the cam (16) associated when the stripping device is in his rest position.   6. Punching machine according to claim 5, characterized in that each driver (24) is formed by a plate provided with two holes (24a, 24b) whose diameters respectively correspond to that of the column (20) and the cam (16). ) associated, this plate   (24) being supported by its rear portion on the upper face of the chain.   riot (23) by means of an associated compensating spring (27) and being threaded through its hole (24a) on the associated column (20), in that a spring (25) is associated with each driver and is mounted between the upper face of the carriage (23) and the associated driver (24), at the front part thereof, each spring (25) urging the associated driver (24)   upwards, and in that a U-shaped lever (30) is pivotally mounted   both by each of its branches on an axis (31) connected to the carriage (23), this lever (30) being provided on each of its branches with a stick (33) each associated with one of the coaches (24), each stub (33) being adapted to lower the associated driver (24) when a thrust to the   bottom is exerted on the lever (30).   7- Punching machine according to any one of the claims   4 to 6, characterized in that a latch (35) pivotally mounted (37) is associated with each column (20), each latch (35) being biased by a spring (38) and being able to pivot and to lodge under the effect of this spring (38) in a groove (20a) corresponding to the column (20) assoceiée. 8- punching machine according to claim 7, characterized in   a rocker (39) is associated with each latch (35), each latch   their (39) being able to cause pivoting of the latch (35) associated, that is to say the unlocking of the column (10) associated with the latch, when the punch arrives at the level of the stripping plate when of its upward movement.   9- Punching machine according to claim 8, characterized in that each rocker (39) is associated with a cam (17) integral with the cylinder rod (12), each cam (17) being adapted to push the associated rocker (39). ) in a retracted position during the lowering of the jack rod (12) and pushing it into a position in which   it causes the pivoting of the associated lock (35) and therefore the unlocking   associated column (20) during the ascent of the stem of cylinder (12).   Punching machine according to any one of the claims   6 to 9, characterized in that a protective casing (32) is connected to the lever (30) for controlling the carriage (23) and is able to move with this cart (23).   Punching machine according to any one of the claims   previous, characterized in that the matrix support table (5) is   detachably on the lower limb (3b) of the frame (3).