JPS593371B2 - Suction head suction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a suction device for a pneumatic separating and conveying device of a machine for processing sheets, for suctioning sheets of very thin to very thick sheets. at least 1 in
The suction nozzle has two suction nozzles which are held in the cylinder for the downward and earth-lifting strokes through a hollow piston rod which serves as a suction air introduction passage leading to the suction nozzles. is able to be lowered into the separating position against the action of a spring force by the suction air action produced on the underside of the piston guided by the
and by suctioning the sheets that are to be separated from the feed pile, the upper side of the piston, together with the sheets attracted by the spring force action and the suction air action produced in the control chamber above the piston. The control piston is located in the cylinder, is movable up and down in the cylinder, and can be raised to a conveying position determined by the stop position of the control piston, which forms a control chamber between it and the piston, and has a suction air action. It relates to a type in which, after releasing the sheet which has been torn and suctioned, it is movable by the action of the same spring force into a higher resting position.

In this case, the sheets include cardboard, sheets of synthetic resin, etc.
This type of adsorption device is called a two-stage adsorption device.

In the case of such suction devices, unlike in the case of single-stroke suction devices (also called jump suction devices), the downward movement of the suction nozzle towards the pile is counteracted by the action of a spring force under the action of suction air. The upward movement of the suction nozzle that has suctioned the sheet is performed by the same spring force by balancing the pressures on both sides of the piston in the suction air path in the cylinder of the piston that holds the suction nozzle. It will be done. The pressure on both the upper and lower sides of the piston is balanced as follows. That is, the inner chamber of the hollow piston rod, which conducts suction pressure to the suction nozzle, communicates with the stroke chamber below the piston through at least one lateral hole in the wall of the piston rod. After the suction nozzle is blocked by paper, the effect of the suction pressure is not limited to the stroke chamber below the piston, but also extends to the cylinder inner chamber above the piston, which communicates with the inner chamber of the hollow piston rod. The interior of the cylinder is also evacuated by the suction air action, creating a pressure balance on both sides of the piston. The limit position of the first stroke of the upward movement of the suction nozzle produced in this manner is defined by the stopper. That is, the piston, which rises under the force of the spring, hits this stop.・
This stopper itself can be constructed in various ways. In the case of a suction device for suctioning and separating sheets from a pile and transporting them, the following problems arise.

That is, the adsorption device must be able to be used for high output operation. In short, the suction device should have a sufficiently large capacity to handle the increasing amount of sheets processed per unit time, and if this capacity can be achieved, it is independent of the weight, size, and quality of the sheets. It means to make it so that it is. For this reason, for high-output operation, priority is given to adopting a double-bush type single-stroke adsorption device.
However, in this case the well-known principle of suction devices, namely the principle of applying suction pressure in parallel to both bushing cavities via one common connection and one branching passage, is ignored. It was considered that the bushing equipped with the nozzle was disadvantageous in descending rapidly.

This bushing is thus evacuated at the same time as the stroke bushing, so that a certain amount of time is unavoidable before the downward stroke of the stroke bushing and thus of the bushing equipped with the suction nozzle begins. For this reason, the point where the suction air is introduced into the suction nozzle is placed after the inside of the stroke bush. However, it is believed by those skilled in the art of double bushings of this type of construction that two-stroke adsorption devices have limitations in terms of capacity.

The reason for this is that the suction nozzle cannot be lowered quickly onto the pile. That is, before the introduced suction air passes through the suction nozzle and captures the sheet, outside air must first be sucked in, and at the same time the cylinder chamber above the piston must be evacuated. This is because the rapid descent of the suction nozzle to the top layer will be prevented. Single-stroke suction devices are not suitable for a kinematically advantageous design of the movement of the suction device after the sheet has been suctioned by the suction nozzle. In this respect, a two-stage adsorption device is more advantageous. In other words, in the case of a two-stage suction device, the return movement of the suction nozzle after transferring the suctioned sheet to the subsequent conveyance mechanism causes the suction nozzle to return to its inactive position, which is set above the conveyance position. It is done at the location. However, since such a return movement requires a relatively large downward stroke from the inactive position to the separation position, it is important that the suction nozzle is lowered rapidly to the separation position without delay. At the same time, in particular, in order to increase the sheet throughput per unit time, the sheet is suctioned with sufficient suction pressure and sufficiently quickly at the moment of application of the suction nozzle to this sheet. That must be guaranteed. This prevents the sheets from being pressed against the pile by the suction nozzle until complete blockage of the suction channels by the sheets occurs.
Furthermore, it must be ensured that the suction effect on the sheet occurs as precisely as possible at the point of reversal of the movement of the suction nozzle. According to known two-stroke suction devices of the type mentioned at the outset, especially in the case of porous sheet materials, the suction nozzle is able to absorb the topmost sheet to be suctioned due to its slow reversal movement. It has been found that large losses are caused by passing the sheet through and also picking up other sheets located below it. This undesirable effect can be said to cause the sheet to be picked up to be displaced in front of the suction nozzle. and the geometry of the upper control chamber of the piston and the inner chamber of the piston rod, which connects the control chamber and the suction nozzle and holds the suction nozzle, to determine the different properties of the sheets to be separated. Adapting the suction pressure strength to It is restricted because it is significantly prevented from acting on the

The object of the invention is basically to provide an adsorption device with a large throughput in contrast to known adsorption devices, and in particular to provide an adsorption device of the type mentioned at the outset with simple and inexpensive structural measures. Contrary to the common belief of those skilled in the art, in order to at least largely eliminate the drawbacks of the known adsorption devices and to significantly improve their suitability for high-power operation, by applying The movement time of the suction nozzle is significantly shortened compared to not only the known double-bush single-stroke adsorption device, in which the amount of descent of the suction nozzle is small due to the movement structure, but also the known two-stage suction device mentioned at the beginning. is possible, and this is to be possible independently of the size, shape, weight or other properties, in particular of the material, of the sheets to be processed.

In order to solve this problem, in the first configuration of the present invention,
In suction devices of the type mentioned at the beginning of pneumatic separating and/or conveying devices of machines for processing sheets, in particular printing or folding machines, a holding sleeve is fitted tightly over the cylinder, and the cylinder A suction air passage extending parallel to the axis is provided between the outer circumferential surface of the cylinder and the holding sleeve, and is connected to the suction air introduction hole. (b) the hollow piston rod containing the control chamber and thus the suction nozzle is always connected by a second transverse hole passing through the wall of the cylinder; (c) a compensation chamber bounded by the control piston towards the top and by a bushing fixedly arranged in the cylinder towards the bottom is always connected by a third transverse hole passing through the wall of the cylinder; I made it seem like it was.

Furthermore, in the second configuration of the present invention, the holding sleeve is tightly fitted over the cylinder, and a suction air passage extending parallel to the axis is provided between the outer peripheral surface of the cylinder and the holding sleeve, and the suction air introduction hole and to the suction air passage (a) the lower stroke chamber of the piston is always connected by a first transverse hole passing through the cylinder wall; and (b) the upper control chamber of the piston is connected to the suction air passage. , and thus the hollow piston rod containing the suction nozzle is always connected by a second transverse hole passing through the cylinder wall, (c)
a compensation chamber bounded by a control piston towards the top and by a bushing fixedly arranged in the cylinder towards the bottom is always connected by a third transverse hole passing through the wall of the cylinder, and In order to be able to adjust the height position of the suction device with respect to the pile, the cylinder is guided in a longitudinally movable manner in a holding sleeve, which is fastened to the holding device of the suction device. It has a vertical slit, and the operating protrusion fixed to the cylinder wall penetrates the vertical slit and projects outward. In this way, the control chamber on the earth side of the piston and the lower side of the piston Due to the fact that the stroke chambers are connected in parallel to the suction air duct by their respective transverse bores, a spring force also acts when suction pressure is exerted on the upper side of the piston, as is feared. The suction pressure, which acts to cause a downward movement of the suction nozzle relative to the pile against the pile, is never disturbed.

In order to increase the efficiency of the suction device according to the first invention, the accuracy of the temporal relationship of the impact process of the suction nozzle on the uppermost sheet, the action of the suction force of the suction nozzle, and the reversal of the movement of the suction nozzle is improved. At the same time, the return process is improved not only by increasing the lowering speed of the suction nozzle relative to the pile, but also, in particular, by increasing the travel speed of the suction nozzle holding the sheets being suctioned from the separating position to the conveying position. It is also important.

In this case as well, it is clear to those skilled in the art that the use of a two-stroke suction device in order to increase the sheet throughput is particularly dependent on the stroke movement of the suction nozzle holding the sheets being suctioned. There are associated problems and for these reasons the use of double bushing single stroke suction devices has been necessitated, with the introduction of suction air into the suction nozzle through the interior of the stroke sleeve. The disadvantageous properties of the known two-stroke adsorption devices are compensated for by simple and economical means, and the adsorption device is superior to the new double-bush single-stroke adsorption devices with respect to the return stroke speed of the adsorption nozzle. In an embodiment of the invention, the suction device is configured such that the downward stroke of the control piston is mechanically limited by a bushing fixed to the cylinder, the bushing having a A stopper pin is guided through the bushing and projects downwardly from the control piston, forming a compensation chamber between the bushing and the control piston, which compensation chamber itself is connected to the stroke chamber and the control chamber. It is connected to the suction air ducts to these chambers via at least one external suction air duct. For this purpose, it is possible to have a stroke-limiting bushing fixed to the cylinder for the control piston, but with a control chamber between the stroke-limiting bushing and the piston holding the piston rod and the suction nozzle with this piston rod. In the case of known two-stroke adsorption devices, the piston and the stroke limiting bushing are necessarily provided and coincident with each other, so that the stroke chamber below the piston and the control piston An axial hole connecting the compensation chamber on the side is avoided and there is also a hollow piston rod on the side of the piston facing the control piston or on the side of the stroke-limiting bush facing the piston. The efficiency of the two-stroke adsorption device is increased if a control room is provided which is fluidly connected to the interior of the adsorption device, and which control room itself has its own suction air connection according to the invention. It has been found that the conventional construction of the two-stroke adsorption device, which was considered unusable by those skilled in the art because of this, can be incorporated into the present invention with great advantage.

In a particularly advantageous embodiment of the invention, the stopper pin has a disc which rests against the bushing in the inactive position, and which disc has at least one diametrical slot or groove which opens towards the interior of the hollow piston rod. It has grooves. In a preferred embodiment of the invention, the suction air duct is designed as a chamfer on the outer circumference of the cylinder wall, the chamfer being covered over its entire length by a retaining sleeve. In a further embodiment of the invention, the suction air channel is configured as a longitudinal groove that opens toward the inside of the inner surface of the retaining sleeve and is covered over its entire length by the outer surface of the cylinder. There is. Both embodiments result in a particularly compact and robust construction.
The choice of embodiment must be made from the viewpoint of manufacturing technology and costs, with particular regard to the respective material properties of the individual components that cooperate with one another. According to the second aspect of the present invention, the suction distance of the suction nozzle to the pile can be arbitrarily adjusted in each case in relation to the material of the sheet to be processed and its condition, so that the sheet can be reliably and sufficiently suctioned. , waste paper can be avoided.

The individual parts of the adsorption device according to the invention are advantageously made of synthetic resin.

The individual parts can likewise be made of a metallic material or a combination of this metallic material and a synthetic resin material. Embodiments of the present invention will be specifically described below with reference to the drawings.

As is well known, the suction device consists of a cylinder 1 having a piston 3 in a stroke chamber 2 which is movable up and down.

The piston has a hollow piston rod 4 which serves as a suction tube and which has a suction nozzle 5 at its free end remote from the piston. On the suction nozzle side, the hollow piston rod 4 is movably guided in a guide bush 7, which is fastened in a suitable manner to the cylinder 1. A push spring 8, which is arranged around the piston rod 4, is supported by a guide bush 7 and is supported by the piston 3.
have an effect on A bushing 12 is fixed to the cylinder 1 above the piston 3, and this bushing is connected to the piston rod 4.
A center hole is formed concentrically with the inner chamber 19 of the cylinder 1, and a stopper pin 13 is inserted into this center hole from above. It is fastened to a control piston 10 which is arranged so as to be possible.

The lower end of the stopper pin 13 has a plate 35 engaging the underside of the bush 12, which plate opens towards the opening of the interior chamber 19 of the piston rod 4 facing the plate. at least one diametrical groove 34 extending therethrough. In this way, even when the upper end wall of the piston 3 is in contact with the stopper pin 13 or with the downwardly facing surface of the plate 35 of the stopper pin, the ring-shaped control chamber 1
1 is formed, and this control chamber 11 communicates with the inner chamber 19 of the piston rod 4 via the groove 34. Stoppin 1
3 is also designed without a plate that engages the bushing 12 from below. The stopper pin 13 has a compensation chamber 26 formed between the upper side 33 of the bushing 12 and the lower side 32 of the control piston 10 when the plate 35 of this stopper pin is in contact with the underside of the bushing 12, and 10 is in contact with the upper side 33 of the bushing 12, the stop position for the piston 3 and therefore the suction nozzle 5
It has such a length that the conveying position of the suction nozzle 5 is defined, and on the other hand, the stroke length of the suction nozzle 5 from the conveying position to the inactive or return position is determined.

At the lower end of the hollow piston rod 4 opposite to the piston, a suction nozzle 5 is fitted in a manner known per se. The passages 16, 17 and 18 of this suction nozzle open into the interior chamber 19 of the piston rod 4.

The upper piston rod end opposite the suction nozzle opens into the control chamber 11 above the piston 3, as already mentioned. A cylinder 1 composed of a cylindrical outer circumferential wall has a chamfered portion 2 in the secant direction over most of its axial length.
9, this chamfer is particularly clearly shown in FIG.

From this chamfer, in each case, one transverse bore 20 leads to the lower stroke chamber 2 of the piston rod 3, one transverse bore 27 to the upper control chamber 11 of the piston 3, and one transverse bore 25 to the upper control chamber 11 of the piston 3.
opens into the compensation chamber 26 below the control piston 10.
The cylinder 1 is fitted with a substantially sleeve-shaped holding sleeve 9, which is fastened in a suitable manner to a holding device generally designated 36 for the suction device according to the invention. This retaining sleeve 9 covers the chamfer 29 on the outer peripheral surface of the cylinder, thus forming a flow passage. In the lower region covering this flow channel, the holding sleeve 9 has a transverse hole, which is shown in FIG. It communicates with the suction air introduction hole 15. In this way, a branch passage for the intake air to be introduced via the intake air introduction hole 15 is formed in the simplest manner in terms of production technology and at the lowest cost, and by means of this branch passage the cylinder The chambers (stroke chamber 2, control chamber 11 and compensation chamber 26) are connected in parallel to each other with respect to the suction air connection. Instead of providing a chamfer 29 on the outer circumferential surface of the cylinder 1 to form a flow passage, a longitudinal groove, which is open towards the cylinder 1 and extends in the axial direction, is provided on the inside of the retaining sleeve 9 facing the cylinder 1. This longitudinal groove is also formed in the air flow on the one hand in the suction air inlet 15 and on the other hand in the cylinder chamber (
It is connected to a transverse hole 20 or 27 or 25 leading to the stroke chamber 2, the control chamber 11 and the compensation chamber 26), which may fulfill the function of a branch channel or flow channel for the introduction of suction air. The working process of the suction device according to the invention will now be described: from the starting position to the separating position The piston 3, which holds the suction nozzle 5 via the hollow piston rod 4, is moved into the starting position shown in FIG. , is held by the force of a push spring 8 supported by the guide bush 7.

Now, when a suction air action is produced in the suction device by a suction air source (not shown) for suctioning sheets, the chambers on both sides of the piston 3 of the suction device, i.e. the lower stroke chamber 2 In addition, the upper control chamber 11 and the compensation chamber 26 have respective lateral holes 20, 27, 25 and a chamfered portion 29.
Flow passage and suction air introduction hole 1 formed by
5 with the suction air of said suction air source. The lower stroke chamber 2 of the piston and the lower compensation chamber 26 of the control piston 10 are therefore evacuated due to the suction air action, and a negative pressure is created in the stroke chamber 2 and the compensation chamber 26, whereas the piston The upper control chamber 11 on the other hand has an inner chamber 19 of the piston rod 4 and a passage 16 of the suction nozzle 5,
17, 18 to atmospheric pressure, so that no load can yet be created in this control chamber 11. As a result, the piston 3 and the control piston 10 are connected to the stroke chamber 2 and the compensation chamber 26.
It is caused to move downward against the pushing force of the push spring 8 by a downward pulling force based on the negative pressure generated inside.

This downward movement causes each chamber (stroke chamber 2, control chamber 11 and compensation chamber 26) to be connected to the suction air source in parallel via the respective transverse holes 20, 27, 25 and the flow channels and suction air inlet holes 15. This is done early and with a high rate of descent based on the connection. The lower compensation chamber 26 of the control piston 10 can be evacuated very quickly by suitable design of the upper effective surface of the bushing 12 and the lower effective surface of the control piston. , thus resulting in an additional force for overcoming the pushing force of the pressure spring 8 against the downward movement of the suction nozzle 5 and a corresponding acceleration of the downward movement of the suction nozzle. That is, the control piston 1 caused by the negative pressure in the compensation chamber 26
The downward movement of the piston 3 can be assisted by the downward movement of the piston 3. The control piston 10 is the control piston 1
0 and the piston 3 by a bushing 12 arranged in the cylinder 1, which defines the transport position of the suction device, which will be described later, whereas the piston 3 is moved by the piston rod 4. The suction nozzle 5 held by the stack continues to move downward until it collides with the top sheet of the pile, that is, until it reaches the separation position (suction position) where the sheets are separated by suction (Fig. 3). ). The downward movement of the separation position piston 3, that is, the suction nozzle 5, causes the suction nozzle 5 to collide with or come into contact with the uppermost sheet, and the passages 16, 17, 18 of the suction nozzle 5 are caused by this sheet.
is closed and thus the interior chamber 19 of the piston rod 4 and the control chamber 11 leading to this interior are evacuated very rapidly without being hindered by the throttle, in effect a suction nozzle As soon as the external air flowing into the control room 11 through the channels 16, 17, 18 of 5 through the inner chamber 19 is interrupted by the uppermost sheet, the sheets to be separated are automatically removed. Regardless of the dimensions and material properties of the paper, it ends reliably without impact movements with exchange of motion.

Adsorption and separation at the separation position Next, the suction nozzle 5 that reaches the separation position and collides with or contacts the top sheet of the pile has its passages 16, 17, 18 closed by the top sheet. , control room 11
Because the inflow of external air into the control chamber 11 is blocked and the control chamber 11 is thus quickly evacuated and loaded with suction air, an adsorption force is generated, which adsorption force The individual sheets of the top layer are reliably held (adsorbed) in the suction nozzle.

In this case, if the sheets have suitable material properties, the top sheet can be reliably separated from the pile by simply impinging the suction nozzle 5 on the top sheet of the pile. This makes it unnecessary to blow up the pile using a blower. From the separation position to the conveyance position, the sheets adsorbed at the separation position (Fig.
), the upper control chamber 11 of the piston 3 is evacuated rapidly due to its parallel connection with the suction air source, as already mentioned, and the air in the upper control chamber 11 of the piston 3 is Similarly, negative pressure is generated in the stroke chamber 2 below the piston 3, and as the force of this negative pressure increases, the increasing force of the negative pressure causes the piston 3 to move upward. Pulling force towards the front and guide bush 7
A push spring 8 is supported by and presses the piston 3 from below.
Based on the fact that the resultant force with the pushing force of
, and in turn, this piston is held via the piston rod 4 (
The suction nozzle 5, which is fixed (fixed), is pushed up to the transport position by the push spring 8 (FIG. 4).

The aforementioned upward movement of the piston 3 and the suction nozzle 5 to the conveying position occurs as the value of the negative pressure in the control chamber 11 above the piston 3 approaches the value of the negative pressure in the stroke chamber 2 below the piston 3. (In other words, as the negative pressure in the control chamber 11 and the negative pressure in the stroke chamber 2 are balanced), it is accelerated. Transport position Negative pressure in the upper control chamber 11 and pressure spring 8 already mentioned
The piston 3 is moved upward by the pushing force of
As shown in FIG. 4, the upper surface of this piston is held in the transport position by abutting against the lower end face of a stopper pin 13 connected to the control piston 10 which defines the transport position.

Although the push spring 8 continues to push the piston 3, a negative pressure is also generated in parallel in the compensating chamber 26 (see FIG. 1) below the control piston 10, as described above. , this negative pressure causes the control piston 10 to move toward the bush 12.
is pulled towards the control piston 10 and held in the conveying position in which it rests against the upper side of the bushing 12 in the lowermost region of the control piston 10 (
Due to its fixed position (fixed position), the piston 3 cannot be moved further upwards in the conveying state.
This is because the pressure spring 8 pushes the piston 3 against the pulling force of the vacuum created in the compensating chamber 26 below the control piston 10 and pulling this control piston 10 downwards.
This is because it is regulated so that it will not be pushed further upwards. Therefore, the transport position of the suction nozzle 5 fixed to the piston is reliably defined. in this case,
The negative pressure generated in the control chamber 11 above the piston 3 is balanced with the negative pressure generated in the stroke chamber 2 below the piston 3, and the piston is activated based on these negative pressures. The upward and downward forces cancel each other out. The sheet sucked by the suction nozzle 5 from the conveyance position to the return position (starting position) is grabbed by another conveyance means (not shown) at the conveyance position, and then the piston 3
Once released from the suction nozzle 5 by blocking the parallel suction air introduction into the lower stroke chamber 2, the upper control chamber 11 of the piston 3 and the lower compensation chamber 26 of the control piston 10, A piston 3 and a suction nozzle 5 fixed to this piston, together with a control piston 10 supported on the piston 3 via a stopper pin 13, were produced in a compensation chamber 26 below the control piston 10. As a result of the collapse of the downward pulling force of the control piston 10 due to the negative pressure, it is pushed up by the push spring 8 into its inactive or return position (starting position) (FIG. 1).

It is also possible according to the invention to allow ambient air (atmospheric pressure) to flow into the upper chambers (control chamber and compensation chamber) and the lower chamber (stroke chamber) of the piston 3 and the passage connections communicating with these chambers. This occurs at the desired speed without significant time delays due to throttling. In this case, the stroke movement to the inactive position is limited by the countersunk surface of the stopper pin 13 remote from the piston hitting the underside of the bush 12, which acts as a stroke limiter bushing, so that the inactive position is is definitely defined. If the stopper pin 13 is designed without a countersunk, the travel distance is adjusted to the force hub plate of the retaining sleeve 9, which is shown in FIG. It may be limited by a fitted stopper ring. In the embodiment according to FIG. 1, the cover plate is used in particular as a dirt protection element. As already mentioned at the outset, no movement of the bushing 12 takes place in this embodiment.

However, it is not difficult for a person skilled in the art to make the travel limiting sleeve movable. As a result of the axially movable bushing 12, on the one hand the effective spring force can be adjusted as a function of the spring characteristic curve, and on the other hand the travel distance of the suction nozzle 5 from the separating position to the conveying position can be adjusted.
The travel distance from the conveying position to the inactive position does not change since it is related only to the length of the stopper pin 13. However, in the illustrated embodiment, a displacement is possible which is achieved with low manufacturing costs for the entire cylinder arrangement in relation to the suction distance of the cylinder arrangement relative to the pile.

For this purpose, a longitudinal slot 37 is provided in the wall of the holding sleeve 9, through which an operating projection 38 passes and is rigidly connected to the cylinder 1 by means of a screw connection, as shown. The engagement points for the actuating projection 38 are selected in such a way that the threaded connection for positive support engages the corresponding bushing 12, as shown in FIG. A further screw connection, which is likewise not numbered but is shown, passes through the retaining sleeve 9 and engages in the cover plate of this retaining sleeve. One rope jacket end of a rope tensioning device 39 is fastened to the threaded connection that engages with the cover plate. The lower end of the rope core of the rope tensioning device is fixed to the cylinder by means of an operating projection 38 attached to the cylinder. A return spring is provided between one rope jacket end of the rope tensioning device and the operating projection 38. In the area of the other rope jacket end of the rope tensioning device, an adjusting lever is provided for an axial sliding movement of the cylinder 1 via the rope core and the actuating projection 38. can be fixed against spring action. After the cylinder 1 has been moved into the desired adjustment position relative to the pile by means of the rope tensioning device 39 via the actuating projection 38 movable along the longitudinal slot 37 of the holding sleeve 9, the suction nozzle 5 is adjusted. The desired working position can be fixed using the adjustment lever. The invention is not limited to the illustrated embodiment.

It is within the scope of the invention to adapt the invention to the particular structural requirements and/or requirements of the individual user by combining features of the invention or by using similarly acting means. possible without deviation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the suction device with the suction nozzle in the inactive position and the cylinder in the uppermost position, and FIG.
FIG. 3 is a sectional view of the adsorption device shown in FIG. 1 in a separated position, and FIG. 4 is a sectional view of the adsorption device shown in FIG. 1 in a conveyance position. 1... Cylinder, 2... Stroke chamber, 3.
...Piston, 4...Piston rod, 5.
...Suction nozzle, 7...Guide bush, 8
...Press spring, 9...Retaining sleeve,
10... Control piston, 11... Control chamber, 12... Bush, 13... Stopper pin, 15... Suction air introduction hole, 16,
17 and 18... passage, 20... lateral hole, 25... lateral hole, 26... compensation chamber, 27... Lateral hole, 29... Chamfered portion, 32... Lower side (of control piston), 3
3... Upper side (of the bush), 34... Groove, 35... Disc, 36... Holding device, 3
7... Vertical slit, 38... Operation protrusion, 39... Rope tension device.

Claims (1)

[Scope of Claims] 1. A suction device for a pneumatic separating and conveying device of a machine for processing sheets, comprising at least one suction device for suctioning sheets from very thin to very thick sheets. It has a suction nozzle which is held and guided into the cylinder for the downward and upward strokes via a hollow piston rod which serves as a suction air introduction passage leading to the suction nozzle. By means of the suction air action produced on the underside of the piston, which is placed in the feed pile, it can be lowered into the separating position against the action of a spring force and, by suctioning the sheet to be separated from the feed pile, Due to the action of the spring force and the action of suction air produced in the control chamber above the piston, the paper, together with the suctioned sheet, is located above the piston and can be moved up and down in the cylinder. The control piston, which forms a control chamber between itself and the piston, can be raised to a conveying position determined by the stop position of the control piston, and the suction air action is interrupted to release the suctioned sheet. In a version which can later be moved further upwards into a rest position by the action of the same spring force, a retaining sleeve 9 is fitted tightly over the cylinder 1, so that the outer circumferential surface of the cylinder 1 and the retaining sleeve 9 are closely fitted together. A suction air passage 29 extending parallel to the axis is provided between the suction air passages 29 and connected to the suction air introduction holes 15.
b) the lower stroke chamber 2 of the piston 3 is always connected by a first transverse hole 20 penetrating the wall of the cylinder 1; b) the control chamber 11 above the piston is then connected to the suction nozzle 5.
a hollow piston rod 4 containing a cylinder 1 is permanently connected by a second transverse hole 27 passing through the wall of the cylinder 1; c) upwardly directed by the control piston 10 and downwardly directed immovably into the cylinder 1; A suction device for a suction head, characterized in that a compensation chamber 26 delimited by an arranged bush 12 is always connected by a third transverse hole 25 passing through the wall of the cylinder 1. 2. The lowering stroke of the control piston 10, which is connected to a stop pin 13 passing through the bushing, is mechanically limited by a bushing 12 fixedly arranged in the cylinder. adsorption device. 3. The stop pin 13 has a plate 35 which rests against the bushing 12 in the inactive position, and which plate 35 has at least one diametrical slit or groove 34 which opens towards the inner space 19 of the hollow piston rod 4. An adsorption device according to claim 2, which has the following. 4. The suction air passage is constructed as a chamfer 29 on the outer circumferential surface of the wall of the cylinder 1, and this chamfer is covered over its entire length by the retaining sleeve 9. The adsorption device described. 5. Claims in which the suction air passage is configured as a vertical groove that opens toward the inside of the inner circumferential surface of the holding sleeve 9, and this longitudinal groove is covered over its entire length by the outer circumferential surface of the cylinder. The adsorption device according to item 1. 6 Suction devices for pneumatic separating and conveying devices of machines processing sheets, having at least one suction nozzle for suctioning very thin to very thick sheets. The suction nozzle is located under the piston, which holds the suction nozzle through a hollow piston rod which serves as a suction air introduction passage leading to the suction nozzle and is guided in the cylinder for the downward and upward strokes. It can be lowered into the separating position against the action of the spring force by means of the suction air action generated to the side, and by adsorbing the sheets to be separated from the feed pile, said action of the spring action and the movement of the piston are prevented. By means of the suction air action produced in the upper control chamber, the control chamber, which is located above the piston and can be moved up and down in the cylinder, together with the attracted sheets, is placed between the piston and the suction air. The same spring force is applied after the suction air action has been interrupted and the suctioned sheet has been released, which can be raised to a conveying position determined by the stop position of the control piston forming the chamber. In the version which can be moved further upwards into a non-active position by means of a cylinder 1, a retaining sleeve 9 is tightly fitted over the cylinder 1, and between the outer circumferential surface of the cylinder 1 and the retaining sleeve 9 there is an axially parallel A suction air passage 29 is provided which extends to the suction air passage 29 and is connected to the suction air introduction hole 15.
b) the lower stroke chamber 2 of the piston 3 is always connected by a first transverse hole 20 passing through the wall of the cylinder 1; and b) the control chamber 11 is then connected to the hollow piston containing the suction nozzle 5. A second transverse hole 2 through which the rod 4 passes through the wall of the cylinder 1
7 and c) a compensation chamber 26 passing through the wall of the cylinder 1, bounded by the control piston 10 towards the top and by the bushing 12 fixedly arranged in the cylinder 1 towards the bottom. 3 and in which the cylinder 1 is guided in a holding sleeve so as to be slidable in the longitudinal direction in order to be able to adjust the height position of the suction device relative to the pile. This holding sleeve is fixed to a holding device 36 of the suction device and has a vertical slit 37, and an operating protrusion 38 fixed to the cylinder wall penetrates the vertical slit and projects outward. A suction device with a suction head characterized by: