JPH08301472A - Pneumatic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a negative pressure feeding or a normal pressure feeding to a sucker and a blower of a sheet feeding device without delaying by always feeding a negative pressure to an inner chamber of a first air distributor of a pneumatic control device and always feeding a normal pressure to an inner chamber of a second air distributor. SOLUTION: This pneumatic control device has two air distributors 1, 2 and both air distributors 1, 2 are disposed in box-like air distributor casings 3, 4. The air distributor casings 3, 4 are superposed and bound each other and are fixed to a back side of a suction head of a sheet feeding device. A negative pressure is always fed to an inner chamber of a first air distributor 3 and a normal pressure is always fed to an inner chamber os a second air distributor 4. Therefore, the negative pressure or the normal pressure can be fed to a sucker and a blower without almost delaying by the inner chamber having a relatively large capacity and forming a pressure accumulator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air control device used for a sheet feeding device, which is provided with an air distributor, and the air distributor is capable of being rotationally driven in a work cycle. A roller, the control roller being rotatably supported on its cylindrical outer peripheral surface in a hole provided in the control bush so as to be closely surrounded by the control bush and rotatable. Has an inner chamber capable of supplying air, and a control cutout in a radial direction from the inner chamber communicates with a cylindrical outer peripheral surface of the control roller, and the cutout is formed in the control bush. Of a type adapted to overlap with the radial control connection made.

[0002]

2. Description of the Related Art In an air control device of this type for supplying a negative pressure or a positive pressure to a sucker and a blower of a sheet feeding device, air having a negative pressure is supplied to an inner chamber of an air distributor. , Alternating with positive pressure air is known. During the switching control from the negative pressure to the positive pressure and the switching control from the positive pressure to the negative pressure, a predetermined transition time is always required until a desired positive pressure or negative pressure is formed in the inner chamber.
This transition time delays full functionality in the sucker or blower.

Further, the leakage from the positive pressure side to the negative pressure side causes the negative pressure to be eliminated on the negative pressure side, and eventually the suction to be impaired.

[0004]

SUMMARY OF THE INVENTION An object of the invention is to improve an air control device of the type mentioned at the outset to provide a sufficiently delay-free negative pressure supply or positive pressure for the suckers and blowers of a sheet feeder. An object of the present invention is to provide an air control device capable of supplying pressure.

[0005]

In order to solve this problem, in the structure of the present invention, the air control device has two air distributors, and the inner chamber of the first air distributor is always negative. The pressure was supplied, and the positive pressure was constantly supplied to the inner chamber of the second air distributor.

[0006]

According to the present invention, the negative pressure or the positive pressure is constantly supplied to the inner chambers of both air distributors.
Due to this internal chamber, which has a relatively large capacity and thus forms a pressure accumulator, negative or positive pressure can be supplied to the sucker and the blower with little delay.

In a simple and advantageous design of the invention, the control roller is tubular or pot-shaped and has an inlet opening which opens axially or coaxially into the inner chamber of the control roller.

In this case, the opening on the inlet side of the hole provided in the control bush may be closed by a bush cover having an inflow connecting portion.

In order to support the control roller easily and with low wear, it is rotatably mounted on the control bush via rolling bearings in one or both of its axial end ranges. Good.

If control rollers manufactured cheaply from tubes are used, the opening on the inlet side of the tubular or pot-shaped control roller is closed by an inserted closing cover, and the inflow opening into said closing cover. Are preferably formed.

Similarly, the opening of the tubular control roller opposite the inlet opening may be closed by the inserted bottom. At the same time, rolling bearings for rotatably supporting the control rollers may be arranged between the bottom and / or closing cover and the control bush. The control bush is preferably arranged so as to be relatively non-rotatable in a notch provided in the air distributor casing. In this case, both air distributors may have a common air distributor casing. The air distributor casing may be provided with a connecting passage and an assembling device, for example for attachment to the suction head of a sheet feeder.

Of course, the control bush may be formed integrally with the control casing.

In order to easily drive the control roller, the control roller has a drive shaft coaxially protruding from the control bush, and the control roller can be rotationally driven via the drive shaft. You can Further, the drive shaft may be connected to a drive pin rotatably supported by the air distributor via a rolling bearing via a driving body, and the drive pin may be rotationally driven.

The drive shaft may be rotationally driven in various forms. For example, it is conceivable that the drive shaft can be rotationally driven by a gear transmission.

In order to perform simple and accurate control,
The drive shaft may be rotationally drivable by a chain transmission or a toothed belt transmission.

If the drive shafts of both air distributors can be rotationally driven by a common drive gear or a common chain drive or a common toothed belt drive, further structural simplification and reduction of the number of components is achieved. Obtainable. The drive chain or the drive toothed belt is guided via sprockets or toothed belt pulleys arranged on the drive shaft or the drive pins.

When viewed in the chain traveling direction or the belt traveling direction, an automatic tension type chain tensioner or belt tensioner is arranged in front of one air distributor, and behind the other air distributor. , If there is an adjustable deflection sprocket or deflection roller arranged to increase or decrease the chain travel path or the toothed belt travel path, the adjustment of the chain travel path or the belt travel path allows At the same time in the work cycle in the distributor, the starting point of the positive or negative pressure supply can be adjusted forward or backward. Early adjustment of the starting point is necessary, for example when the sheet feeder is operated at high cycle speeds, in order to compensate for speed-related filling loss in the air supply system.

In order to increase or decrease the chain traveling path or the toothed belt traveling path in front of one air distributor and behind the other air distributor as viewed in the chain traveling direction or the belt traveling direction. Each one of the adjustable sprocket or the adjustable roller is arranged in the, and the automatic tension type chain tensioner or belt tensioner is arranged between both air distributors. Larger individual adjustment is possible according to the conditions that occur each time. With such a configuration, the starting point of the negative pressure air distributor and the starting point of the positive pressure air distributor can be adjusted independently of each other.

The adjustment of the deflection sprocket or the deflection roller can be performed manually. However, it is particularly operatively suitable if the deflection sprocket or deflection roller is adjustable by an electric motor. In addition, pneumatic or hydraulic adjustment and adjustment by a centrifugal force adjuster are also possible.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

The illustrated air control device has two air distributors 1, 2. Both air distributors 1, 2 are arranged in a box-shaped air distributor casing 3, 4. The air distributor casings 3, 4 are joined together in an overlapping manner and are fixed to the back side of the suction head 5 of the sheet feeder. Both air distributors 1 and 2 basically have the same structure.

A cross-sectional view of the air distributor 2 is shown in FIG. The air distributor casing 4 has a cylindrical notch 6 which extends in a consistent manner, in which a control bush 7 is fixedly inserted. This control bush 7
A control connection 8 is formed in the radial direction that extends consistently in the radial direction. This control connection 8 has a corresponding connection passage 9,1
0, and the connecting passages 9, 10 communicate with the corresponding connecting pipe pieces 11, 11 '.

A negative pressure consumer or a positive pressure consumer, such as a sucker or a blower, can be connected to the connecting pipe pieces 11 and 11 'via a connecting pipe line.

The cylindrical inner wall of the control bush 7 tightly surrounds the cylindrical outer wall of the tubular control roller 12. The lower end of the control roller 12 is the bottom 1
Closed by 3. The outwardly facing end face of this bottom 13 has a carrier 14. This carry 1
4 engages with a corresponding driver 17 provided on a drive pin 16 which is rotatably supported on the control bush 7 via a rolling bearing 15. The drive pin 16 is the closing cover 1
8 penetrates outward in the axial direction, and a toothed belt pulley 19 is held at the outer end of the toothed belt 8 so as not to rotate relative to it.

The upper end of the control roller 12 has a closing cover 20.
Has been closed by. The closure cover 20 has an inflow opening 21 in the center. The closing cover 20 also has a bottom 13
Also has an annular groove 22 that extends axially outward and extends radially in an annular shape. In this annular groove 22,
The rolling bearing 23 is inserted. The control roller 12 is rotatably supported in the control bush 7 by the rolling bearing 23. The control bush 7 itself is also closed at its upper end by a bush cover 24. The bush cover 24 has an inflow connecting portion 2 for connecting to a positive pressure source.
5 is provided.

At the corresponding inlet connection of the air distributor 1,
A negative pressure source can be connected.

The control roller 12 is formed with a control notch 26 which extends continuously in the radial direction. When the control roller 12 rotates, the control cutouts 26 overlap the control connection portions 8 respectively corresponding to these control cutouts 26, and the corresponding connection pipe pieces 11, 11 ′ are connected via the control connection portions 8.
Supply positive or negative pressure to.

As can be seen from FIG. 1, since the connecting passage 10 'communicates with the connecting pipe piece 11 via the adjusting valve 27, the cross section of the flow passage can be changed by the manual rotation of the adjusting knob 28. .

As can be seen from the principle diagram shown in FIG. 4 or FIG. 5, both control rollers 12 are provided with toothed belt pulleys 19 and 19 'provided in the air distributors 1 and 2, respectively. The endless toothed belt 29 guided via the belt pulleys 19 and 19 'makes it possible to drive it in rotation in the work cycle of the sheet feeder.

This drive is performed by the drive roller 30 in the counterclockwise direction as seen in the drawing. The toothed belt 29 includes three deflection rollers 3 provided before and after the driving roller 30.
1, a deflection roller 32 whose position can be adjusted manually or by an electric motor by turning around the rotation axis of the toothed belt pulley 19, a toothed belt pulley 19, a belt tensioner 33, and a toothed belt It is guided via a belt pulley 19 'and a deflection roller 34 whose position can be adjusted manually or by means of an electric motor by means of swiveling around the axis of rotation of this toothed belt pulley 19'.

By turning the turning roller 32, the control roller 12 of the toothed belt pulley 19 is turned, and by turning the turning roller 34, the control roller of the toothed belt pulley 19 'is turned on.
Each can be adjusted early or late in the work cycle.

In the embodiment shown in FIG. 4, the both deflection rollers 3
2, 34 can be adjusted separately and independently of one another, whereas in the embodiment shown in FIG. 5, both deflection rollers can only be adjusted together. The left side range (not shown) of the toothed belt guide mechanism corresponds to FIG.

Toothed belt pulley 1 when viewed in the belt running direction
An adjustable deflection roller 35 is provided in front of 9 ', and a belt tensioner 36 is arranged behind the toothed belt pulley 19 as seen in the belt running direction.

The adjusting device shown in FIGS. 6 to 9 for adjusting the air distributors 1 and 2 in the early direction or the late direction corresponds to the adjusting mechanism shown in FIG.

Toothed belt pulley 1 of air distributors 1 and 2
9, 19 ', a deflection roller 35, a drive roller 30,
A toothed belt 29 is wound around the belt tensioner 36.

A support plate 37 is arranged on the suction head 5 so as to be rotatable about a rotation axis 38. The deflecting roller 35 is mounted on a shaft 39 so as to be freely rotatable. The shaft 39 is fixed in the upper region of the support plate 37 in parallel with the rotation axis of another roller.

Further, a turning lever 40 is arranged so as to be able to freely turn about the turning axis 38. This swivel lever 40 holds a roller 41 at its free end, and a belt tensioner 36 together with a tension spring 42 pre-loaded between the shaft 39 and the free end of the swivel lever 40. Is forming.

In the area to the left of the support plate 37 in the drawing, an actuating nut 43 is fixed, which is pivotable about its own longitudinal axis. An operation spindle 45, which can be rotationally driven by an operation motor 44 pivotally attached to the suction head 5, can be screwed into the threaded hole provided in the operation nut 43. By means of this actuating spindle 45, the support plate 37, and thus also the deflection roller 35 together with the support plate 37, can be swiveled, so that the starting points of the air distributors 1, 2 can be adjusted in the early or late direction.

[Brief description of drawings]

FIG. 1 is a side view with a partial cross section of an air control device.

2 is a cross-sectional view of an air distributor of the air control device shown in FIG.

3 is a partial cross-sectional view of a second air distributor of the air control device shown in FIG.

4 is a principle view showing an adjusting mechanism for separately adjusting the air distributor of the air control device shown in FIG. 1. FIG.

5 is a principle diagram showing an adjusting mechanism for adjusting the air distributors of the air control device shown in FIG. 1 together.

6 is a side view of an adjustment device for adjusting the air distributor of the air control device shown in FIG. 1 together.

FIG. 7 is a side view of the adjusting device shown in FIG. 6;

FIG. 8 is a plan view of the adjusting device shown in FIG. 6;

9 is a detailed view of the operating nut of the adjusting device shown in FIG.

[Explanation of symbols]

1, 2 air distributor, 3, 4 air distributor casing, 5 suction head, 6 notch, 7 control bush, 8 control connection part, 9, 10, 10 'connection passage, 11, 11' connection pipe piece, 12 Control roller,
13 bottom part, 14 driving body, 15 rolling bearing, 16 drive pin, 17 driving body, 18 closing cover, 19, 19 'toothed belt pulley, 20
Closure cover, 21 inflow opening, 22 annular groove, 23
Rolling bearing, 24 bush cover, 25 inflow connection, 26 control notch, 27 control valve, 28
Adjustment knob, 29 toothed belt, 30 driving roller, 31, 32 diverting roller, 33 belt tensioner,
34, 35 deflecting roller, 36 belt tensioner, 3
7 support plate, 38 swivel axis, 39 axis,
40 swivel lever, 41 roller, 42 tension spring, 43 actuating nut, 44 actuating motor, 45
Working spindle

Claims (16)

[Claims] 1. An air control device for use in a sheet feeding device, comprising an air distributor, the air distributor having a control roller rotatable in a working cycle. The control roller is rotatably supported by a cylindrical outer peripheral surface thereof in a hole provided in the control bush so as to be closely surrounded by the control bush so as to be rotatable, and the control roller is supplied with air. An inner chamber, from which a radial control notch communicates with the cylindrical outer peripheral surface of the control roller, the notch being provided in the control bush in the radial control direction; In the type in which it overlaps with the connection part, the air control device has two air distributors (1, 2), and the inner chamber of the first air distributor (1) is always negative. Pressure is supplied and the inner chamber of the second air distributor (2) is always positive. An air control device characterized in that pressure is supplied. 2. The control roller (12) is formed in a tubular shape or a pot shape, and each inflow opening (21) is opened in the inner chamber of the control roller (12) axially or coaxially. The air control device according to claim 1. 3. Air control device according to claim 2, characterized in that the opening on the inlet side of the hole provided in the control bush (7) is closed by a bush cover (24) having an inflow connection (25). . 4. The control roller (12) is rotatably supported in one or both of its axial end ranges in the control bush (7) via a rolling bearing (23). Item 4. The air control device according to any one of items 1 to 3. 5. A closing cover (2) in which an opening on the inlet side of the control roller (12) having a tubular or pot shape is inserted.
3. The air control device according to claim 2, which is closed by means of 0) and has an inlet opening (21) formed in the closing cover (20). 6. Pneumatic control device according to claim 2, characterized in that the opening of the tubular control roller (12) opposite the inlet opening (21) is closed by an inserted bottom (13). . 7. A rolling bearing (23) for rotatably supporting the control roller (12), said bottom (13) and / or closing cover (18) and said control bush (7).
The air control device according to claim 5 or 6, which is disposed between the air control device and the air control device. 8. The control bush (7) according to claim 1, wherein the control bush (7) is arranged non-rotatably in a notch (6) provided in the air distributor casing (3, 4). The air control device according to claim 1. 9. The air control system of claim 8 wherein both air distributors have a common air distributor casing. 10. The control roller (12) has a drive shaft coaxially protruding from the control bush (7), and the control roller (12) can be rotationally driven via the drive shaft. The air control device according to any one of claims 1 to 9. 11. The drive shaft can be rotationally driven by a chain transmission or a toothed belt transmission.
The air control device according to claim 10. 12. The drive shaft of both air distributors (1, 2) is
The pneumatic control device according to claim 11, which can be rotationally driven by a common chain transmission or a common toothed belt transmission. 13. Air according to claim 12, in which the drive chain or the drive toothed belt (29) is guided via sprockets or toothed belt pulleys (19, 19 ') arranged on the drive shaft. Control device. 14. An automatic tension type chain tensioner or belt tensioner (36) is arranged in front of one air distributor when viewed in the chain traveling direction or the belt traveling direction, and the other air distributor is arranged. Arranged behind the distributor (1) is a deflection sprocket or deflection roller (35) which is adjustable to increase or decrease the chain or toothed belt travel. Air control device as described. 15. A chain running path or a toothed belt running path is provided in front of one air distributor (2) and behind the other air distributor (1) when viewed in the chain running direction or the belt running direction. One sprocket or one diverting roller (32, 34), which can be adjusted to increase or decrease, is arranged, and is automatically tensioned between the two air distributors (1, 2). 13. A chain tensioner or belt tensioner (33) according to claim 12, which is arranged.
Air control device as described. 16. Air control device according to claim 14 or 15, characterized in that the deflecting sprockets or deflecting rollers (32, 34, 35) are adjustable by means of electric motors.