WO2017089675A1

WO2017089675A1 - Device for eliminating precut pieces, abutment member and assembly comprising such a device

Info

Publication number: WO2017089675A1
Application number: PCT/FR2016/052951
Authority: WO
Inventors: Nicolas RAVELEAU
Original assignee: Raveleau Nicolas
Priority date: 2015-11-26
Filing date: 2016-11-15
Publication date: 2017-06-01
Also published as: FR3044248A1; FR3044248B1

Abstract

A device (1) for eliminating pieces (31) precut from a sheet (30) of material, comprising a die (2) and an ejection member (32), said die (2) having a separation surface (3) on which the sheet (30) is able to be placed and being equipped with at least one hole (4) that is able to be covered by a piece (31) precut from the sheet (30), this hole (4) being provided with at least one stationary abutment member (9) in the form of an attached piece with a body (10) that is insertable into the thickness of the die (2) at a housing (5) of the die (2) adjoining the hole (4) and radiating in the direction of the axis passing through said hole (4) in order to lead out into this hole (4) and a head (15) that is disposed in continuation of the body (10) and protrudes into the hole (4). The body (10) of the abutment member (9), which is a rigid piece, has at least one portion with a cylindrical or cylindroconical body with a longitudinal axis extending substantially parallel to the separation surface (3) of the die (2).

Description

DEVICE FOR REMOVING PREDECUTED PIECES, ORGAN

DE STOPE AND ASSEMBLY COMPRISING SUCH A DEVICE

FIELD OF THE INVENTION The invention relates to a device for eliminating pre-cut pieces, in particular scrap, from a sheet of material comprising cuts or the like.

PRIOR ART

It relates more particularly to a device comprising a matrix capable of cooperating with a punch-type ejection member, said die having a separation surface on which the sheet is adapted to be laid, said die being equipped with at least one suitable breakthrough to be covered by a pre-cut piece of the sheet, this breakthrough being provided with at least one stationary abutment member, able to temporarily hold the pre-cut piece capable of being separated from the sheet and pushed through the breakthrough under the pressure of the ejection member, during a relative displacement between ejection member and die, each stop member being in the form of a insert with a body adapted to be inserted into the thickness of the die at the level of a housing of the matrix adjacent to the breakthrough, and radiating towards the axis passing through said breakthrough to open into this breakthrough, and a disposed head in the extension of the body, and projecting inside the breakthrough to provide a support zone forming a stop of the pre-cut piece to be separated, as shown in patent FR 2 745 220. In this patent, the The abutment member is an elastically deformable part, which generates a lower mechanical strength of the part, accompanied by premature wear of the part.

To solve this problem, it has been devised rigid stationary thrust members, as illustrated in EP 1 679 163. However, in this case, the mounting of the stop member on the die is tedious. PURPOSE AND SUMMARY

An object of the invention is to provide a device of the aforementioned type, overcoming the disadvantages of the state of the art, and whose design allows a mounting in a short time and easy manner of each stationary abutment member having a resistance high mechanical

To this end, the subject of the invention is a device for eliminating pre-cut pieces, in particular rejects, from a sheet of material comprising sections or the like, this device comprising a matrix capable of cooperating with an ejection member of the type punch, said die having a separation surface on which the sheet is adapted to be laid, said die being equipped with at least one breakthrough adapted to be covered by a pre-cut piece of the sheet, said breakthrough being provided with at least one stationary abutment member adapted to momentarily retain the pre-cut piece capable of being separated from the sheet and pushed through the breakthrough under the pressure of the ejection member, during a relative displacement between the ejection member and the die, the or at least one of the abutment members being in the form of an insert with a body adapted to be inserted into the thickness of the matrix at a logem ent of the matrix adjacent to the breakthrough and radiating towards the axis passing through said breakthrough to open into this breakthrough, and a head disposed in the extension of the body and extending projecting inside the breakthrough to provide a bearing zone forming an abutment of the pre-cut piece to be separated, characterized in that said abutment member is a rigid piece and in that the body of the abutment member has at least one cylindrical or cylindrical-conical body section. longitudinal axis extending substantially parallel to the separation surface of the matrix, in the configuration of use of the device in the positioned state, the body inside the housing of the matrix.

It should be noted that in the expression substantially parallel to the separation surface is meant in parallel, plus or minus 15 °. The cylindrical or cylindro-conical design of the body of the stop member facilitates its introduction into the housing of the matrix adjacent to the breakthrough. The realization of the stop member in the form of a rigid part limits the risk of premature wear. According to one embodiment, the body of the stop member is supported. This shoulder makes it possible to prevent any displacement of said stop member in the direction of the traversing axis of said pierce, during a separation operation.

According to one embodiment, each housing of the piercing is stepped to delimit, between its shoulder and its mouth in said pierce, a first cavity for receiving a part of the head of said stop member, and to spare, beyond said shoulder, at least a second cavity receiving interlocking at least a portion of the body of the stop member held fixed inside said second cavity. This part of the body of the stop member is thus jammed inside the second cavity. According to one embodiment, the head of the stop member is of cylindrical or cylindro-conical shape.

According to one embodiment, the head of the abutment member projecting inside the breakthrough, extends towards a housing adjacent to the breakthrough, formed opposite the housing adjacent to the body receiving piercing to insert it partially.

According to one embodiment, the perimeter of the head of the abutment member is less than the perimeter of the body of the abutment member.

According to one embodiment, the head of the abutment member has, between its zone of connection to the body of the abutment member and its free end, a widening, the perimeter of this enlargement being equal to or greater than the perimeter of the abutment member. thrust body. According to one embodiment, the head of the abutment member has a thinned free end, the thinning being preferably formed by a chamfer or a shoulder of said free end.

According to one embodiment, the body of the abutment member is provided on its end face, said free, opposite its zone of connection to the head, a boss projecting from said end face.

According to one embodiment, the boss is formed at the central longitudinal axis of the cylindrical portion of the body of the stop member.

According to one embodiment, the so-called free end face of the body of the abutment member, opposite to the zone of connection of the body to the head, is chamfered to form an inclined section adapted to lift a sheet striking said free end face of the body of the stop member.

The invention also relates to a stationary abutment member adapted to equip a breakthrough of a matrix of a device according to that described above, characterized in that said stop member is in the form of a rigid piece with a body adapted to be inserted into the thickness of the matrix at a housing of the matrix adjacent to the breakthrough and radiating towards the axis passing through said breakthrough to open into this breakthrough and a head disposed in the extension of the body and able to extend projecting inside the breakthrough to provide a support zone forming a stop of the pre-cut piece to be separated, the body of the stop member having at least one section of cylindrical body or cylindro-conical longitudinal axis capable of extending substantially parallel to the separation surface of the matrix.

According to one embodiment, said stationary stop member is of the aforementioned type.

In particular, according to one embodiment, the body of the stop member is provided on its end face, said free, opposite its connection area to the head, of a boss projecting from said end face.

Preferably, the boss is formed at the central longitudinal axis of the cylindrical portion of the body of the stop member.

According to one embodiment, the so-called free end face of the body of the abutment member, opposite to the zone of connection of the body to the head, is chamfered.

The subject of the invention is also an assembly comprising a device for eliminating pre-cut pieces, in particular rejects, from a sheet of material comprising cuts or the like and an ejection member, characterized in that the device is in conformity with that described above. BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:

- Figure 1 shows a series of block diagram of an assembly according to the invention illustrating the process of separating a piece of a sheet. - Figure 2 shows a top view of a pre-cut piece of a sheet and the associated stop members.

- Figure 3 shows a partial top view of a matrix, taken at a breakthrough of the matrix and the associated abutment member.

FIG. 4 represents, in the form of two schematic views, the steps of insertion of an abutment member into a housing of the matrix adjacent to a breakthrough.

- Figure 5 shows a schematic side view of a stop member in the inserted state in a housing of a matrix during the step of separating a pre-cut piece of a sheet. - Figure 6 shows, in the form of a series of schematic views in section or in perspective, embodiments of a stop member.

As mentioned above, the device 1, object of the invention, allows to eliminate precut pieces 31, including scrap, a sheet of material 30 having cuts or the like. These precut pieces 31 can still be called falls. Generally, the sheet of material 30 is for example constituted by a pre-cut cardboard blank, each precut corresponding to a piece to be subsequently eliminated.

This sheet of material 30, after having undergone a number of operations, is brought and placed on the separation surface 3 of a matrix 2, so that the pre-cut piece 31 covers a breakthrough 4 of the die 2. This breakthrough 4 generally has a homothetic profile to the profile of the pre-cut made in the sheet of material 30. Thus, when the breakthrough 4 affects a rectangular shape, the pre-cut piece 31 also has a generally rectangular shape.

A punch-like ejection member 32 is moved downwardly therethrough 4 so as to exert pressure on the pre-cut piece 31 to allow it to separate from the sheet of material 30. This ejection member 32 may affect a lot of forms. In the example shown in Figure 1, it is formed of a blade machined at its free end, so as to define needles or points.

This ejection member 32 cooperates with at least one stationary abutment member 9 disposed below the pre-cut piece 31 and projecting at least partially in the pierce 4, as shown in FIG. 1. To allow the positioning of this stop member 9, the breakthrough 4 of the die 2 comprises at least one housing 5 radiating toward the axis passing through said breakthrough 4 to open into this breakthrough 4. This housing 5 is shaped to receive retaining the body 10 and a portion of the head 15 of the stop member 9. This stop member 9 is here in the form of a rigid piece made of metal or synthetic material reinforced with fibers. By rigid part is meant a non-elastically deformable piece and stiff enough not to deform, in particular by folding, under the effect of a force applied by hand on said piece.

The body 10 of the abutment member 9 has at least one cylindrical or cylindro-conical body section of longitudinal axis extending substantially parallel to the separation surface 3 of the matrix 2, in the configuration of use of the device, in the positioned state of the body 10 inside the housing 5 of the die 2.

The head 15 of the stop member 9, disposed in the extension of the body 10, projects into the interior of the pierce 4, to provide a bearing zone forming a stop of the pre-cut piece 31 to be separated, less in the state separated from the piece 31 precut from the rest of the matrix. In some examples shown, particularly in Figure 6, the head 15 of the abutment member 9 is of cylindrical or cylindro-conical shape and the perimeter of the head 15 of the abutment member 9 is less than the perimeter of the body 10 of the stop member 9, the body and the head of the stop member 9 being coaxial.

In other examples of FIG. 6, the head 15 of the abutment member 9 is of cylindrical or cylindro-conical shape and has, between its zone of connection to the body of the abutment member and its free end, a widening also of cylindrical or cylindro-conical shape. The perimeter of this enlargement may be equal to or greater than the perimeter of the abutment body, the body and the head of the abutment member 9 being coaxial. In the example shown in Figure 2, for one of the abutment members, the head of the abutment member, projecting inside the bore, extends towards a housing adjacent to the breakthrough arranged opposite the housing, adjacent to the breakthrough, reception of the body to be inserted partially. The stop member thus acts as bridge. The pre-cut piece 31 may at its zone facing the abutment member be provided with an additional cut.

The ejection of the pre-cut piece 31 takes place in two stages, as illustrated in FIG. At first, the ejection member 32 that moves from top to bottom pushes on the pre-cut piece 31, and detaches it from the sheet 30 of material. The pre-cut piece 31, separated from the sheet 30 of material, falls and rests on the head of the stop members distributed around the breakthrough. The ejection member 32 continues to push on said piece 31 pre-cut, which causes a bending of the piece 31 pre-cut to exceed the heads of the stop members. The piece 31 pre-cut then goes back flat and is driven down. The heads of the stop members 9 prevent any rise of the pre-cut piece 31 during the ascent of the or ejection members 32.

To prevent any displacement of the stop member 9 in the direction of the axis passing through said piercing 4 during a separation operation, the body 10 of the stop member 9 is supported. This shoulder is shown at 13 in the figures.

Similarly, each housing 5 of the piercing 4 is stepped to define, between its shoulder 61 and its mouth 62 in said pierce 4, a first cavity 7 for receiving a portion of the head 15 of said stop member 9, and arrange beyond said shoulder 61, at least a second cavity 8 receiving interlocking at least a portion of the body 10 of the stop member 9 fixedly fixed inside said second cavity 8.

In the examples shown, the housing 5 may comprise a third cavity in communication with the second cavity, as shown in Figure 3, wherein the body 10 of the stop member 9 is formed of two cylindrical sections separated by a groove.

This housing 5 may also include a second cavity containing the entire body 10 of the abutment member 9 when the body is formed of a cylinder of the same diameter along the entire length of the body, as illustrated in FIG. last view of Figure 6, which simplifies the design of the housing.

For the insertion of the abutment member 9 inside the housing, it is possible to proceed as illustrated in FIG. 4. The abutment member 9 is positioned at least partially above the housing 5 adjacent to the breakthrough 4 , with the longitudinal axis of the cylinder of the body of the stop member 9 extending parallel to the separation surface 3 of the matrix. Once the stop member 9 prepositioned inside the housing, is introduced further before said stop member 9 inside the housing with a hammer. The body 10 of the stop member 9 is jammed by force insertion at least in the second cavity of the housing. The cylindrical shape allows pre-positioning of the abutment member 9 in the housing 5 before complete insertion of said abutment member 9 into the housing 5 to a position generally flush with the separation surface 3 of the matrix 2.

To further facilitate the introduction, the body 10 of the abutment member 9 is provided on its end face 1 1, said free, opposite its zone of connection to the head 15, a boss 12 protruding of said end face 1 1. The boss 12 is here provided at the central longitudinal axis of the cylindrical portion of the body 10 of the stop member 9.

This boss tends to press the shouldered portion of the body of the abutment member 9 against the shoulder 61 of the housing 5. In addition, this boss 12 causes a groove or groove in the thickness of the matrix. At first, this boss 12 prevents the abutment member 9 from descending further, once it is flush with the matrix. It is possible in a second time to add a drop of powerful cyanolite glue in the furrow that has been created. This filling prevents upward movement of the stop member 9. This prevents in particular a possible tilting of the stop member 9 in the breakthrough 4 of the die when the punch exerts a pressure on the pre-cut piece and consequently on the head 15 of the stop member 9 forming an area of support of said piece. Finally, it is noted that the so-called free end face 1 1 of the body 10 of the abutment member 9, opposite the connection zone of the body 10 to the head 15, is chamfered to form an inclined section suitable for lifting a sheet 30 striking said free end face 1 1 of the body 10 of the stop member 9. This chamfer is represented at 14 in the figures. This chamfer also allows a prepositioning of the stop member 9 inside the housing 5 adjacent to the breakthrough of the die. Indeed, by a simple manual pressure, the abutment member is slightly wedged in the upper part of the housing 5. This momentary stable position facilitates its total depression with the aid of a hammer in the thickness of the die 2 until 'touching. This results in a saving of time.

Thus, in case of shifting by partial exit from its housing member 9 abutment, the latter does not have an impassable surface in the form of a wall, the sheet scrolling on the surface 3 of separation of the matrix 2 The inclined section then forms an upward slope ramp from the end of the body towards the head of the stop member 9, allowing lifting of the sheet.

Finally, to facilitate the bending of the pre-cut piece 31 and its sliding downwards, in the position of bearing contact of the pre-cut piece 31 on the head 15 of the stop member 9, during the separation operation, the head 15 of the abutment member 9 has a thinned free end 16. This thinning may be formed by a chamfer 17 or a shoulder 18 of said free end 16, as shown in FIG. 6.

Claims

1. Device (1) for removing precut pieces (31), in particular rejects, from a sheet (30) of material comprising sections or the like, this device (1) comprising a matrix (2) adapted to cooperate with a member ( 32), said die (2) having a separation surface (3) on which the sheet (30) is adapted to be laid, said die (2) being equipped with at least one breakthrough (4). ) capable of being covered by a pre-cut piece (31) of the sheet (30), this piercing (4) being provided with at least one stationary stop member (9) able to momentarily retain the pre-cut piece (31) suitable for being separated from the sheet (30) and pushed through the bore (4) under the pressure of the ejection member (32), during a relative displacement between the ejection member (32) and the die (2) , the at least one of the abutment members (9) being in the form of an insert with a body (10) suitable for inserted in the thickness of the matrix (2) at a housing (5) of the matrix (2) adjacent to the breakthrough (4) and radiating towards the transverse axis of said piercing (4) for to open into this piercing (4), and a head (15) disposed in the extension of the body (10) and projecting inside the bore (4) to provide a support zone forming a stop of the piece (31) pre-cut to separate,

characterized in that said abutment member (9) is a rigid piece and in that the body (10) of the abutment member (9) has at least one cylindrical or cylindro-conical body section of longitudinal axis extending substantially parallel to the separation surface (3) of the die (2), in the configuration of use of the device (1), in the positioned state of the body (10) inside the housing (5) of the matrix (2).

2. Device (1) according to claim 1,

characterized in that the body (10) of the abutment member (9) is supported.

3. Device (1) according to one of the preceding claims,

characterized in that each housing (5) of the breakthrough (4) is supported for delimiting, between its shoulder (61) and its mouth (62) in said bore (4), a first cavity (7) for receiving a portion of the head (15) of said stop member (9), and beyond said shoulder (61), at least a second cavity (8) accommodating at least a portion of the body (10) of the stop member (9) held fixed inside said second cavity ( 8).

4. Device (1) according to one of the preceding claims,

characterized in that the head (15) of the abutment member (9) is cylindrical or cylindro-conical.

5. Device (1) according to one of the preceding claims,

characterized in that the head (15) of the abutment member (9), projecting inside the bore (4), extends towards a housing adjoining the breakthrough formed opposite the housing ( 5), adjacent to the piercing (4), receiving the body (10) to be inserted partially.

6. Device (1) according to one of the preceding claims,

characterized in that the perimeter of the head (15) of the abutment member (9) is smaller than the perimeter of the body (10) of the abutment member (9).

7. Device (1) according to one of the preceding claims,

characterized in that the head (15) of the abutment member (9) has a thinned free end (16), the thinning being preferably formed by a chamfer (17) or a shoulder (18) of said end (16). 16) free.

8. Device (1) according to one of the preceding claims,

characterized in that the body (10) of the abutment member (9) is provided on its end face (1 1), said free end, opposite its connection area to the head (15), a boss (12) projecting from said end face (1 1).

9. Device (1) according to claim 8, characterized in that the boss (12) is provided at the central longitudinal axis of the cylindrical portion of the body (10) of the stop member (9).

10. Device (1) according to one of the preceding claims,

characterized in that the end face (1 1), said free, of the body (10) of the organ

(9) opposite to the connection zone of the body (10) to the head (15), is chamfered to form an inclined face adapted to lift a sheet (30) striking said face (1 1) of free end the body (10) of the stop member (9).

1 1. Stationary thrust member (9) adapted to equip a piercing (4) with a die (2) of a device (1) according to one of Claims 1 to 10,

characterized in that said abutment member (9) is in the form of a rigid piece with a body (10) adapted to be inserted into the thickness of the die (2) at a housing (5) of the matrix (2) adjacent to the breakthrough (4) and radiating towards the axis passing through said piercing (4) to open into this piercing (4) and a head (15) arranged in the extension of the body

(10) and adapted to protrude inside the bore (4) to provide a bearing zone forming a stop of the pre-cut piece (31) to be separated, the body (10) of the member (9) ) of abutment having at least one cylindrical or cylindro-conical body section of longitudinal axis capable of extending substantially parallel to the surface (3) of separation of the matrix (2).

Stationary thrust member (9) according to claim 11,

Stationary thrust member (9) according to claim 12,

characterized in that the boss (12) is provided at the central longitudinal axis of the cylindrical portion of the body (10) of the stop member (9).

Stationary thrust member (9) according to one of Claims 1 to 13, characterized in that the so-called free end face (1 1) of the body (10) of the abutment member (9), opposite to the zone of connection of the body (10) to the head (15), is chamfered.

15. An assembly comprising a device (1) for removing precut pieces (31), in particular rejects, from a sheet (30) of material comprising cuts or the like and an ejection member (32),

characterized in that the device (1) is according to one of claims 1 to 10.