CN211074028U

CN211074028U - Punching sheet forming machine with thickness adjusting mechanism

Info

Publication number: CN211074028U
Application number: CN201921592797.3U
Authority: CN
Inventors: 石国能; 张琪; 岳涛; 冯志巍
Original assignee: Changzhou Tejet Lightning Protection Technology Co ltd
Current assignee: Changzhou Tejet Lightning Protection Technology Co ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-07-24
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses a towards piece make-up machine with thickness adjustment mechanism belongs to piezo-resistor production processing technology field, and its technical scheme main points are, which comprises a frame, feed mechanism and die mechanism, die mechanism includes the mould, well mould and lower mould, the die cavity that link up about the vertical direction of edge has been seted up on the well mould, the lower mould slides and connects in the die cavity, well mould below is equipped with thickness adjustment mechanism, thickness adjustment mechanism is from last to including supporting shoe and adjusting part down, adjusting part orders about the degree of depth direction motion of supporting shoe along the die cavity, the supporting shoe is close to the one end and the well mould butt of well mould the utility model discloses can play the distance of easily adjusting well mould apart from last mould to change the effect of die cavity degree of depth, the person of facilitating.

Description

Punching sheet forming machine with thickness adjusting mechanism

Technical Field

The utility model belongs to the technical field of piezo-resistor production and processing technique and specifically relates to a towards piece make-up machine with thickness adjustment mechanism is related to.

Background

The voltage dependent resistor is a voltage limiting type protection device, in the power industry, the voltage dependent resistor is often used to make a lightning arrester valve plate, and in an electronic circuit, the voltage dependent resistor is often used to play roles of overvoltage protection, lightning protection, surge current suppression, spike pulse absorption and the like. The selection of the voltage-sensitive value of the piezoresistor is important, the protection effect and the service life are related, and the voltage-sensitive value of the piezoresistor is related to the thickness of a piezoresistor sheet during the production of the piezoresistor. At present, the die-pressing forming of the varistor sheet is often finished by a punching forming machine.

Chinese patent No. CN207997393U discloses a ceramic dry powder molding press, which comprises a frame, an upper hydraulic press, a mold and a mechanical transmission mechanism box; the top end of the mechanical transmission mechanism box is provided with a movable ejection rod, and the upper hydraulic press comprises a piston rod; the die comprises an upper die, a middle die and a lower die, wherein the middle die is fixed on the frame, a die cavity which is communicated up and down is arranged at the axis part of the middle die, and the middle die is also communicated with a powder box; the upper die comprises an upper die frame and an upper punch, and the upper die frame is arranged on a piston rod of the upper hydraulic press; the lower die is arranged on the mechanical transmission mechanism box and comprises a lower die core, and the lower die core is arranged on the ejection rod.

When the dry powder forming machine in the technical scheme is used for pressing the varistor tablets, the shape of the die is fixed, the thickness of the pressed tablets is inconvenient to adjust, and when a user needs to press the varistor tablets with different thicknesses, the die needs to be replaced, so that the operation is troublesome.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a towards piece make-up machine with thickness adjustment mechanism, the effect of thickness easily adjustment when it has the suppression of piezo-resistor tablet.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a towards piece make-up machine with thickness adjustment mechanism, includes frame, feed mechanism and die mechanism, die mechanism includes mould, well mould and lower mould, well mould is last to offer the die cavity that link up from top to bottom along vertical direction, the lower mould slide connect in the die cavity, its characterized in that: the middle die is characterized in that a thickness adjusting mechanism is arranged below the middle die and comprises a supporting block and an adjusting component from top to bottom, the adjusting component drives the supporting block to move along the depth direction of the die cavity, and one end of the supporting block, which is close to the middle die, is abutted to the middle die.

Through adopting above-mentioned technical scheme, order about the supporting shoe through adjustment mechanism and remove along the depth direction of die cavity, easily change the degree of depth of die cavity to can realize the effect that one set of mould mechanism easily suppressed different thickness piezo-resistor tablet. When the supporting shoe moves to the direction of keeping away from last mould, easily drive well mould downwards to play the effect that reduces the degree of depth of die cavity, when the supporting shoe moves to the direction of being close to last mould, easily be close to the mould motion through promoting well mould, play the effect that increases the degree of depth of die cavity.

The utility model is further arranged that the supporting block is positioned below the die cavity, the lower die is arranged in the supporting block in a penetrating way, and the lower die is connected with the supporting block in a sliding way; the lower mould is fixed with the jacking cylinder, the piston rod orientation of jacking cylinder the lower mould sets up.

By adopting the technical scheme, the lower die is easy to move close to the upper die due to the extension of the piston rod of the jacking cylinder, so that the lower die can realize the effect of ejecting the piezoresistor tablets after being punched in the die cavity. The lower die is arranged in the supporting block in a penetrating mode and connected with the supporting block in a sliding mode, and interference of the supporting block on the demolding effect of the lower die is reduced.

The utility model is further arranged that two symmetrical side surfaces of the supporting block are inclined planes, and one ends of the two inclined planes close to the middle die are mutually far away; the adjusting assembly comprises a connecting block, an adjusting screw rod and a limiting plate, the connecting block comprises a first connecting block and a second connecting block, the adjusting screw rod comprises a first thread section part and a second thread section part, the thread directions of the first thread section part and the second thread section part are opposite, the first connecting block is in threaded connection with the first thread section part, and the second connecting block is in threaded connection with the second thread section part; one surfaces of the two connecting blocks, which are close to the supporting block, are parallel to the inclined surface and are connected with the inclined surface in a sliding manner; and one ends of the two connecting blocks, which are far away from the supporting block, are connected with the limiting plates in a sliding manner.

Through adopting above-mentioned technical scheme, through adjusting screw's rotation, easily two connecting blocks are close to each other or keep away from. When two connecting blocks were close to each other for the supporting shoe moves to the direction that is close to the mould along the inclined plane, thereby easily the supporting shoe realizes promoting in the mould to the effect of being close to the mould direction motion. When two connecting blocks keep away from each other for the supporting shoe moves to the direction of keeping away from last mould along the inclined plane, thereby easily the supporting shoe realizes driving the mould in to keeping away from the effect of last mould direction motion. Through the setting that connecting block and inclined plane slip connection promoted the supporting shoe up-and-down motion, stability when easily increasing this scheme thickness adjustment mechanism and adjusting the die cavity degree of depth to easily well mould realization is steadily gone up and down.

The utility model discloses further set up to, the limiting plate is close to first spacing spout and the spacing spout of second have been seted up to adjusting screw's one side, first connecting block with first spacing spout slides and connects, the second connecting block with the spacing spout of second slides and connects.

Through adopting above-mentioned technical scheme, first spacing spout and the spacing spout of second play the effect of support and direction to the connecting block, easily two connecting blocks along adjusting screw thread removal on the one hand, and on the other hand easily reduces and walks inclined to one side the condition emergence when the connecting block moves to play the effect that improves adjustment mechanism stability in this scheme.

The utility model discloses further set up to, the length of first spacing spout does 95% of first screw thread section length, the length of the spacing spout of second does 95% of second screw thread section length.

Through adopting above-mentioned technical scheme, when having reduced adjusting screw and having rotated, the condition that the screw thread section on connecting block and the adjusting screw breaks away from easily maintains adjusting part's normal operating.

The utility model discloses further set up to, the cover is equipped with the mounting on the adjusting screw, just the mounting is located first screw thread section portion with between the second screw thread section portion, adjusting screw with the mounting rotates to be connected, the mounting with limiting plate fixed connection.

Through adopting above-mentioned technical scheme, the mounting is under the circumstances that does not influence the screw rod rotation, easily increases adjusting screw's stability, reduces adjusting screw and rocks the possibility.

The utility model discloses further set up to, adjusting screw's one end coaxial fixation has servo motor, just servo motor with the frame is fixed.

Through adopting above-mentioned technical scheme, the rotation through servo motor easily drives adjusting screw's rotation to easily two connecting blocks of adjusting screw drive are close to each other or are kept away from along adjusting screw.

The utility model is further arranged in that a feeding box is arranged between the upper die and the middle die, and the feeding box and the middle die are abutted against one end of the upper die; the feeding box is communicated with the feeding mechanism and reciprocates in the direction vertical to the die cavity through a feeding cylinder.

Through adopting above-mentioned technical scheme, reciprocating motion through the pay-off box easily adds the piezo-resistor powder in the die cavity on the one hand, and on the other hand easily pushes out the piezo-resistor tablet that the mould punching press was accomplished from the well mould outwards, helps the drawing of patterns of piezo-resistor tablet.

To sum up, the utility model discloses following beneficial effect has:

1. through thickness adjustment mechanism's setting, can play the distance of easily adjusting the well mould distance and going up the mould to change the effect of die cavity degree of depth, convenient to use person produces the piezo-resistor of thickness difference.

2. Through adjusting screw, inclined plane, connecting block and servo motor's setting, can play the effect that easily the user adjusted die cavity thickness fast and steadily.

3. Through the setting of pay-off box and pay-off cylinder, easily add the piezo-resistor powder to the die cavity, help the drawing of patterns of piezo-resistor tablet simultaneously.

Drawings

Fig. 1 is a schematic view of the overall structure of the present embodiment.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

FIG. 3 is a schematic view of the connection between the feeding mechanism and the frame and the feeding box.

Fig. 4 is a schematic structural view of the middle mold and the connecting block after being moved in this embodiment.

Fig. 5 is a partially enlarged schematic view of a portion B in fig. 4.

Fig. 6 is a partially enlarged schematic view of a portion C in fig. 5.

In the figure, 1, a frame; 2. a feeding mechanism; 21. a storage bin; 22. a feed pipe; 23. a feeding box; 24. a feeding cylinder; 3. an upper die; 31. punching a die head; 32. a hydraulic press; 4. a middle mold; 41. a mold cavity; 5. a lower die; 51. jacking a cylinder; 52. connecting sheets; 6. a thickness adjusting mechanism; 61. a support block; 611. a bevel; 6111. a sliding groove; 612. an avoiding hole; 62. an adjustment assembly; 621. connecting blocks; 6211. a first connection block; 6212. a second connecting block; 622. adjusting the screw rod; 6221. a first threaded section; 6222. a second threaded section; 623. a limiting plate; 6231. a limiting chute; 62311. a first limiting chute; 62312. a second limiting chute; 624. a fixing member; 625. a servo motor; 7. and a cylinder mounting table.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the punching sheet forming machine with the thickness adjusting mechanism disclosed in this embodiment includes a frame 1, and a feeding mechanism 2 and a die mechanism are arranged on the frame 1. And adding the piezoresistor powder into the die mechanism through the feeding mechanism 2, and pressing the piezoresistor tablet by using the die mechanism.

Referring to fig. 1, the mold mechanism comprises an upper mold 3, a middle mold 4 and a lower mold 5 in sequence from top to bottom, the upper mold 3 comprises a punching die head 31, a hydraulic press 32 is arranged above the upper mold 3, the punching die head 31 is mounted on a piston rod of the hydraulic press 32, the punching die head 31 and the piston rod of the hydraulic press 32 are arranged along the vertical direction, and the punching die head 31 is easily driven to lift along the vertical direction through the extension and retraction of the piston rod of the hydraulic press 32.

Referring to fig. 2, the middle mold 4 is a cylindrical body, a mold cavity 41 vertically penetrating through the middle mold 4 is formed in the cylindrical body, the mold cavity 41 is located right below the die head 31 and is arranged with the die head 31 sharing a central axis, and the die head 31 is easily pressed into the mold cavity 41 to press the varistor sheets. Lower mould 5 one end is worn to establish in die cavity 41 and is connected with die cavity 41 inner wall sliding, and the other end is connected with jacking cylinder 51, and jacking cylinder 51's piston rod is close to lower mould 5 setting, through stretching out of jacking cylinder 51 piston rod, easily lower mould 5 moves along the direction that is close to last mould 3 in die cavity 41, and it is ejecting from the varistor tablet that easily accomplishes the suppression in die cavity 41, the drawing of patterns of the tablet of being convenient for. In order to increase the tabletting efficiency, the number of the mold cavities 41 is two, the number of the corresponding lower molds 5 is two, the connecting piece 52 is welded at one end of the piston rod of the jacking cylinder 51 close to the lower mold, one end of the two lower molds 5 far away from the middle mold 4 is welded with the connecting piece 52, and a user can drive the two lower molds 5 to lift through one jacking cylinder 51.

Referring to fig. 3, the feeding mechanism 2 includes a bin 21, a feeding pipe 22 and a feeding box 23, the feeding box 23 is communicated with the bin 21 through the feeding pipe 22, and the bin 21 is fixed to the frame 1. The feeding box 23 is abutted against one surface of the middle mold 4 close to the upper mold 3, two discharging ports (not shown in the figure) corresponding to the positions of the two mold cavities 41 are formed in one surface of the feeding box 23 close to the middle mold 4, and the feeding box 23 is driven by the feeding cylinder 24 to do reciprocating linear motion on the rack 1 along the direction vertical to the mold cavities 41. When the feeding box 23 is in a static state, one surface of the middle die 4 close to the upper die 3 forms a seal for a feeding port, and powder is not easy to spill. When the piston rod of the feeding cylinder 24 extends out, the feeding box 23 is pushed to move forwards, so that the feeding port is gradually close to the upper part of the die cavity 41, and when the feeding port is contacted with the die cavity 41, powder in the feeding box 23 leaks into the die cavity 41 through the feeding port, so that feeding of the die cavity 41 is realized.

Referring to fig. 4, a thickness adjusting mechanism 6 is arranged below the middle mold 4, the thickness adjusting mechanism 6 includes a supporting block 61 and an adjusting component 62 from top to bottom, the supporting block 61 is abutted to one end of the middle mold 4 far away from the upper mold 3, and the adjusting component 62 drives the supporting block 61 to move up and down along the depth direction of the mold cavity 41, so that the middle mold 4 is pushed to move up and down relative to the lower mold 5, and the effect of changing the depth of the mold cavity 41 is achieved.

Referring to fig. 5, the supporting block 61 is disposed right below the middle mold 4, two symmetrical side surfaces of the supporting block 61 are inclined surfaces 611, and one ends of the two inclined surfaces 611 close to the middle mold 4 are far away from each other. The adjusting assembly 62 comprises a connecting block 621, an adjusting screw 622 and a limiting plate 623, the connecting block 621 comprises a first connecting block 6211 and a second connecting block 6212, the two connecting blocks 621 are symmetrically arranged at two ends of the supporting block 61 along the moving direction of the feeding box 23, and one surface of each connecting block 621 close to the supporting block 61 is parallel to and connected with the inclined surface 611 in a sliding manner. Specifically, the two inclined surfaces 611 are respectively provided with a sliding groove 6111 along the length direction thereof, and the connecting block 621 is connected with the sliding groove 6111 in a sliding manner through the sliding block thereon, so as to reduce the occurrence of the deviation when the connecting block 621 and the supporting block 61 slide relatively. By setting the adjusting screw 622, the adjusting screw 622 is used as power to drive the connecting block 621 to slide along the inclined surface 611, thereby achieving the effect of pushing the supporting block 61 to move up and down in the vertical direction.

Referring to fig. 5, the adjusting screw 622 includes a first threaded section 6221 and a second threaded section 6222, the first threaded section 6221 and the second threaded section 6222 have opposite thread directions, the end of the first connecting block 6211 away from the supporting block 61 is in threaded connection with the first threaded section 6221, the end of the second connecting block 6212 away from the supporting block 61 is in threaded connection with the second threaded section 6222, and the two connecting blocks 621 are easily driven to move simultaneously by the rotation of the adjusting screw 622. Limiting plate 623 is located adjusting screw 622, limiting sliding groove 6231 has been seted up to the one side that limiting plate 623 is close to adjusting screw 622, limiting sliding groove 6231 includes first limiting sliding groove 62311 and the limiting sliding groove 62312 of second, first limiting sliding groove 62311 and the spacing line of the second limiting sliding groove 62312 with first screw thread section 6221 and second screw thread section 6222 are the symmetry axis, set up along the length direction symmetry formula of limiting plate 623, so that first connecting block 6211 slides through the first slider and the first limiting sliding groove 62311 of its lower extreme integral type setting and is connected, make second connecting block 6212 be convenient for slide through the second slider and the limiting sliding groove 62312 of its lower extreme integral type setting simultaneously and be connected. The limiting sliding groove 6231 supports and limits the connecting blocks 621, so that the two connecting blocks 621 are easily driven by the adjusting screw 622 to approach or separate from each other.

Referring to fig. 5, the length of the first limiting sliding groove 62311 is 95% of the length of the first threaded section 6221 of the adjusting screw 622, and the length of the second limiting sliding groove 62312 is 95% of the length of the second threaded section 6222 of the adjusting screw 622, so that the lengths of the two limiting sliding grooves 6231 are both smaller than the length of the threaded section on the adjusting screw 622, and the occurrence of the situation that the connecting block 621 is separated from the adjusting screw 622 is reduced.

Referring to fig. 5, in order to facilitate driving the rotation of the adjusting screw 622 and reduce the manpower input, a servo motor 625 is coaxially fixed to one end of the adjusting screw 622, the servo motor 625 is fixed to the frame 1, and the adjusting screw 622 is easily driven to rotate by the rotation of the servo motor 625.

Referring to fig. 6, a fixing member 624 is sleeved on the adjusting screw 622, the adjusting screw 622 is rotatably connected to the fixing member 624, one end of the fixing member 624 is fixed to the limiting plate 623 through a bolt, and the fixing member 624 is located between the first threaded section 6221 and the second threaded section 6222. The fixing part 624 is used for fixing the adjusting screw 622, so that the stability of the adjusting screw 622 is improved. One side of the limiting plate 623, which is close to the adjusting screw 622, is provided with a cylinder mounting table 7, the cylinder mounting table 7 is fixed to the fixing member 624 through a bolt, and the bottom of the jacking cylinder 51 is fixed to the cylinder mounting table 7. The bottom surface of the supporting block 61 is provided with an avoiding hole 612, and the jacking cylinder 51 penetrates through the avoiding hole 612 so as to reduce the mutual interference between the supporting block 61 and the jacking cylinder 51.

The implementation principle of the above embodiment is as follows: when the punching sheet forming machine in the embodiment is used, in the process of driving the feeding box 23 to extend out through the feeding cylinder 24, the varistor powder is injected into the die cavity 41, and in the process of driving the feeding box 23 to reset through retraction of the feeding cylinder 24, the varistor powder in the die cavity 41 is leveled. After the feeding box 23 is reset, the hydraulic press 32 is started, the die head 31 is driven by the hydraulic press 32 to extend into the die cavity 41 to stamp the powder in the die cavity 41 so as to form the powder, and the hydraulic press 32 drives the die head 31 to retract and reset. And then starting a jacking cylinder 51 positioned below the lower die 5, driving the lower die 5 to move close to the upper die 3 when a piston rod of the jacking cylinder 51 stretches, ejecting the piezoresistor material sheet which is punched in the die cavity 41, and then ejecting the piezoresistor material sheet which is formed by the compression molding by extending the feeding box 23 again to finish material sheet demoulding. At this time, the cavity 41 is restored to be hollow, and the feed box 23 can inject the varistor powder into the cavity 41 again to press the die 31 again.

When the piston rod of the jacking cylinder 51 is in a retraction static state, the horizontal height of the lower die 5 is fixed, and a user drives the first connecting block 6211 and the second connecting block 6212 to approach each other through the servo motor 625 and the adjusting screw 622, so that the supporting block 61 is easily pushed to move close to the upper die 3 along the vertical direction, and the middle die 4 is lifted, so that the depth of the die cavity 41 is increased, and a thicker piezoresistor sheet can be easily pressed by the punching forming machine in the embodiment. When a user desires to press a thinner sheet, the two connecting blocks 621 are moved away from each other, thereby allowing the supporting block 61 to fall down and reducing the depth of the cavity 41.

In order to maintain the integrity of the mold cavity 41, the user can control the thread lengths of the first thread segment 6221 and the second thread segment 6222 on the adjusting screw 622 to make the bottom of the middle mold 4 flush with or slightly higher than the top of the lower mold 5 when the middle mold is at rest when the supporting block 61 is lifted to the highest position; when the support block 61 is lowered to the lowest position, the depth of the cavity 41 is equal to the thinnest thickness of the sheet of varistor required by the user. The user can also control the two moving limit heights of the supporting block 61 by the sliding slot 6111 formed on the inclined surface 611, and the user can also control the two moving limit heights of the supporting block 61 by controlling the rotation of the servo motor 625.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a towards piece make-up machine with thickness adjustment mechanism, includes frame (1), feed mechanism (2) and die mechanism, die mechanism includes mould (3), well mould (4) and lower mould (5), well mould (4) are gone up and are seted up die cavity (41) that link up from top to bottom along the vertical direction, lower mould (5) slide connect in die cavity (41), its characterized in that: a thickness adjusting mechanism (6) is arranged below the middle die (4), the thickness adjusting mechanism (6) comprises a supporting block (61) and an adjusting component (62) from top to bottom, the adjusting component (62) drives the supporting block (61) to move along the depth direction of the die cavity (41), and one end, close to the middle die (4), of the supporting block (61) is abutted to the middle die (4).

2. The punching sheet forming machine with the thickness adjusting mechanism as claimed in claim 1, characterized in that: the supporting block (61) is positioned below the die cavity (41), the lower die (5) is arranged in the supporting block (61) in a penetrating mode, and the lower die (5) is connected with the supporting block (61) in a sliding mode; the lower die (5) is fixed with a jacking cylinder (51), and a piston rod of the jacking cylinder (51) faces the lower die (5).

3. The punching sheet forming machine with the thickness adjusting mechanism as claimed in claim 1, characterized in that: two symmetrical side surfaces of the supporting block (61) are inclined surfaces (611), and one ends of the two inclined surfaces (611) close to the middle die (4) are far away from each other; the adjusting assembly (62) comprises a connecting block (621), an adjusting screw rod (622) and a limiting plate (623), the connecting block (621) comprises a first connecting block (6211) and a second connecting block (6212), the adjusting screw rod (622) comprises a first thread section (6221) and a second thread section (6222), the thread directions of the first thread section (6221) and the second thread section (6222) are opposite, the first connecting block (6211) is in threaded connection with the first thread section (6221), and the second connecting block (6212) is in threaded connection with the second thread section (6222); one surfaces of the two connecting blocks (621) close to the supporting block (61) are parallel to the inclined surface (611) and are connected with the inclined surface (611) in a sliding manner; and one ends of the two connecting blocks (621), which are far away from the supporting block (61), are connected with the limiting plate (623) in a sliding manner.

4. The punching sheet forming machine with the thickness adjusting mechanism as claimed in claim 3, characterized in that: limiting plate (623) are close to the one side of adjusting screw (622) has seted up first spacing spout (62311) and second spacing spout (62312), first connecting block (6211) with first spacing spout (62311) slide and are connected, second connecting block (6212) with second spacing spout (62312) slide and are connected.

5. The punching sheet forming machine with the thickness adjusting mechanism as claimed in claim 4, wherein: the length of the first limiting sliding groove (62311) is 95% of the length of the first thread section (6221), and the length of the second limiting sliding groove (62312) is 95% of the length of the second thread section (6222).

6. The punching sheet forming machine with the thickness adjusting mechanism as claimed in claim 3, characterized in that: the adjusting screw rod (622) is sleeved with a fixing piece (624), the fixing piece (624) is located between the first thread section part (6221) and the second thread section part (6222), the adjusting screw rod (622) is rotatably connected with the fixing piece (624), and the fixing piece (624) is fixedly connected with the limiting plate (623).

7. The punching sheet forming machine with the thickness adjusting mechanism as claimed in claim 3, characterized in that: one end of the adjusting screw rod (622) is coaxially fixed with a servo motor (625), and the servo motor (625) is fixed with the rack (1).

8. The punching sheet forming machine with the thickness adjusting mechanism as claimed in claim 1, characterized in that: a feeding box (23) is arranged between the upper die (3) and the middle die (4), and the feeding box (23) is abutted to one end, close to the upper die (3), of the middle die (4); the feeding box (23) is communicated with the feeding mechanism (2), and the feeding box (23) reciprocates along the direction vertical to the die cavity (41) through a feeding air cylinder (24).