Vacuum picking system

Abstract

A self-service machine, such as an automated teller machine (70), that includes a plurality of vacuum pick mechanisms (10) for picking media (12), such as banknotes, each vacuum pick mechanism (10) including a pump (18), a pickline (20) connected the pump, a drive mechanism for moving the pickline (20) between a media pick position and a media release position, and a motor (33) for driving both the pump (18) and the drive mechanism.

Description

BACKGROUND OF THE INVENTION

The present invention relates to a vacuum picking system for picking up and moving sheet media, such as banknotes, and in particular a valveless vacuum picking system. The present invention also relates to a self-service terminal such as an automated teller machine that includes such a system.

Vacuum picking systems are used in automated teller machines for dispensing cash. Most of these include some form of pump mechanism for sucking air through a tube, which tube has a suction pad on its end. When the suction pad is moved into contact with a banknote the suction created by the pump causes the banknote to stick to the pad. This effectively closes the end of the pad, and the tube. Continued action of the pump causes the pressure in the tube to lower, so that the banknote can be securely held in place. Once so secured, the banknote can be moved as and when desired.

Most automated teller machines include a plurality of vacuum picking modules so that different denominations of banknotes can be dispensed. For example, in the UK, typically four modules are provided, two of which may include twenty-pound notes and the other two of which may include ten-pound notes. In order that notes can be dispensed, each module has to have a separate banknote pick-up mechanism, each with its own pickline. FIG. 1 shows one known vacuum-based system, in which each pickline is connected to an individual pump, and each of the pumps is connected to a single AC motor. Associated with each pickline is a solenoid valve for opening or closing the line so that air can be selectively evacuated thereform. Also associated with each line is gearing or other mechanical means (not shown) for moving the end of the pickline into contact with the banknote, and then towards a dispensing location. This gearing is powered by the AC motor.

In use, when cash is to be dispensed from the system of FIG. 1, the motor is switched on and all of the pumps are run simultaneously. Because the motor also powers the gearing, this means that all of the gearing is caused to move. Once the pump is running, one of the valves is opened so that air is drawn through the associated pickline. The end of the pickline, which usually carries a suction cap, is then is moved towards the banknote until it is in contact therewith. As described previously, this causes the banknote to stick to the cap so that it can be removed under the action of the vacuum.

FIG. 2 shows another known arrangement. In this, a single pump driven by a single motor is used to create a pressure difference in a selected one of the pick-up lines and drive a gearing mechanism for moving the pickline between pick-up and release positions. Each of the picklines is provided as a separate branch of a single line that is connected directly to the pump. Provided in each pickline is a solenoid valve. By selectively opening and closing the solenoid valves as appropriate, a selected one of the picklines can be exposed to the pump and so used for a pick and place action. In use, the motor is switched on to power the pump. Because the motor also powers the gearing, this means that all of the gearing is caused to move. Once the pump is running, one of the valves is opened so that air is drawn through the associated pickline and the suction cap on the line is moved towards the banknote until it is moved into contact therewith, and removed as described previously.

Various problems arise with the arrangements of FIGS. 1 and 2. For example, a relatively large AC motor is needed, which reduces the level of control that can be exercised. Also, because all the pumps are run simultaneously, the power requirements, and so operational costs, are relatively high. In addition, because all of the gearing is run when the motor is on, this means that wear can be significant. Furthermore, both of the systems of FIGS. 1 and 2 require a solenoid valve in each pickline. Since solenoid valves can be difficult to control, this increases the complexity of the system.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an improved mechanism for dispensing banknotes from a self-service terminal.

According to one aspect of the invention there is provided a self-service machine, such as an automated teller machine, that includes a plurality of valveless vacuum pick mechanisms for picking media, such as banknotes, each valveless vacuum pick mechanism including a pump, a pickline connected the pump, a drive mechanism for moving at least a portion of the pickline between a media pick position and a media release position, and a motor for driving both the pump and the drive mechanism.

By providing each of the plurality of vacuum pick mechanisms with an individual pump and a separate motor, the need for valves can be avoided, and wear on the drive system can be reduced.

The pump may be a single stroke pump, preferably a synchronous stroke pump. The drive mechanism may be operable to move the pickline and a piston of the stroke pump. The drive mechanism may be operable to move the pickline between a media pick position and a media release position and back again in a single pump stroke cycle. The motor may be a stepper motor.

According to another aspect of the invention, there is provided a valveless vacuum pick mechanism for picking media, such as banknotes, including a pump, a valveless pickline connected to the pump, a drive mechanism for moving the pickline between a media pick position and a media release position, and a motor for driving both the pump and the drive mechanism.

The pump may be a single stroke pump, preferably a synchronous stroke pump. The drive mechanism may operable to move the pickline and a piston of the stroke pump. The drive mechanism may be operable to move the pickline between the media pick and release positions and back again in a single pump stroke cycle. The motor may be a stepper motor.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects of the invention will now be described by way of example only and with reference to the accompanying drawings, of which:

FIG. 3 is a schematic view of a valveless pick mechanism in a first position;

FIG. 4 is a plan view of the mechanism of FIG. 3;

FIG. 5 is a schematic view of the valveless pick mechanism of FIG. 3 in a second position;

FIG. 6 is a schematic view of the valveless pick mechanism of FIG. 3 in a third position;

FIGS. 7(a), (b) and (c) are front isometric, back isometric and side views respectively of a cam cluster for use in a drive mechanism for the valveless pick mechanism of FIG. 3;

FIGS. 8(a) and (b) are front and rear plan views respectively of the cam cluster of FIG. 7;

FIG. 9 is a plan view of a drive arm for use in the arrangement of FIG. 3, and

FIG. 10 is a schematic view of an automated teller machine that includes a plurality of the valveless pick mechanisms of FIG. 3.

DETAILED DESCRIPTION

FIGS. 3 to 6 show a vacuum pick mechanism 10 for picking a banknote 12 individually from a bundle 14 of such notes in a dispensing cassette 16 and forwarding that note 12 to another part of the dispenser. For the sake of clarity, only a single mechanism 10 is shown. However, it will be appreciated that in, for example, an ATM environment, a plurality of these would be stacked on top of each other.

The vacuum pick mechanism 10 of FIGS. 3 to 6 is carried on a support or housing of a cash dispensing cassette 16. It includes a single stroke pump 18, the output of which is connected directly to a pickline 20 that has a flexible tube portion 22 and a rotatable, rigid tube 24 that carries two downwardly extending pick-up members 26 (only one shown) at the ends of which are provided suction cups 28. Formed through the rigid tube 24 and each of the pick up members 26 are channels that open into the suction cups 28, so that a clear, valveless fluid flow path is provided between the pump 18 and the suction cups 28. As can be seen most clearly in FIG. 4, the rigid tube 24 is positioned substantially parallel to the dispensing end of the cassette 16, so that in use both the suction cups 28 can be moved into contact with a front one of the notes in the cassette 16.

To move the suction cups 28 between a pick position and a release position, connected to one end of the rigid tube 24 is a gear 30 of a drive mechanism. This drive mechanism is also connected to the piston 32 of the single stroke pump 18 and is powered by a stepper motor 33. The drive mechanism is operable to move the piston 32 of the pump 18 and at the same time cause the rigid tube 24 to move the suction cups 28 close to or into engagement with a banknote in the dispensing cassette 16. Stroking of the piston 32 creates enough of a pressure difference to cause the banknote 12 to stick to the cups 28. As shown in FIG. 5, continued action of the drive causes movement of the suction cups 28 and the note 12 away from the pick position towards a release position, in which the note 12 can be caught in take-away pinch rollers 34, 36 of a dispensing mechanism.

The pinch rollers 34, 36 of the dispensing mechanism are driven by the stepper motor 33, so that they can be moved between a rest position and a gripping position in an appropriate sequence timed to correspond with the movement of the suction caps 28 between the pick up and release positions. As shown in FIGS. 3, 5 and 6, one of the pinch rollers 34 has a D-shaped cross section and the other 36 has a circular cross-section. When the motor 33 is switched on initially, the D-shaped roller 34 is located half a turn away from a gripping position in which it co-operates with the other roller 36 to grip the banknote. Rotation of the semi-circular roller 34 by substantially half a turn is timed to correspond with movement of the banknote 12 into the area between the rollers 34 and 36, so that it can be gripped therebetween, as shown in FIG. 6.

The timing of the drive mechanism is such that when the banknote 12 is gripped by the rollers 34 and 36, the return stroke of the piston 32 starts. This allows the pressure difference between the pickline 20 and ambient to be gradually reduced, which in turn reduces the hold on the note 12. This allows the note 12 to be removed from the cups 28 by the rollers 34 and 36. Continued movement of the drive rotates the semi-circular roller 34 by another half turn thereby to pass the note 12 onto the next stage of the dispensing mechanism, typically a vertical transport system 38, and return the D-shaped roller 34 to its starting position. At the same time, this continued movement of the drive returns the suction cups 28 and the pump piston 32 to their starting positions. In this way, with each cycle of the piston 32, a single note 12 can be picked from the cassette 16, and moved to the transport mechanism 38, and the drive, piston 32 and dispensing gear 34 and 36 can be returned to positions ready for re-use.

As will be appreciated various different drive mechanisms could be used. An example of a suitable such mechanism will now be described in more detail. This includes a pickline drive segment 40 for moving the rigid pickline tube 24, and so the suction cups 28, a pump rod arrangement 42, 44 and 46 for driving the piston 32 of the pump 18 and a cluster cam 48 for driving each of the pickline drive segment 40 and the pump rod arrangement 42, 44 and 46.

FIGS. 7 and 8 shows various views of the cluster cam 48. This includes a pickline cam 50, a circular drive gear 52 and a pump drive cam 54. Typically all parts of the cluster cam 48 are integrally formed. Defined through the centre of the cluster 48 and concentric with the drive gear 52 is a hole 56 for receiving a shaft, about which the cluster cam 48 can be driven by engagement of the drive gear 52 with a corresponding gear mechanism (not shown) driven by the stepper motor 33. Of course, any other suitable arrangement for coupling to the motor 33 could be used.

FIGS. 7(a) and 8(a) show the pickline cam 50. This has a smooth edged triangular shape defined by an external ridge 58, and is positioned so that one of its smooth corners protrudes beyond the edge of the circular drive gear 52. Formed inwardly of the external ridge 58 is a correspondingly shaped internal ridge 60, the internal and external ridges defining a cam track 62 between them. The cam track 62 is shaped and sized to receive a roller 64 that projects from a surface of the pickline drive arm 40, as shown in FIG. 9. This arm 40 is pivoted co-axially with one end of the pump crank arm 42 that is connected at its other end by a rod 44 to one end of the piston 32 of the pump 18. At the other end of the pickline drive arm 40 is formed a gear 66 for meshing with the gear 30 carried on the rigid tube 24 of the pickline 20. One cycle of rotation of the cluster cam 48 by the motor 33 causes movement of the arm gear 40 into engagement with the gear 30 on the rigid tube 24 and so rotation of the suction caps 28 away from the pick up position and towards the release position. Continued rotation of the cam 48 causes the suction pads 28 to be rotated back to their starting position.

FIGS. 7(b) and 8(b) show the eccentric pump drive cam 54. This has a circular cross-section and is positioned offset relative to the centre of the cluster 48. Pivotally mounted on the pump cam 54 is a drive rod 46 that is fixedly connected at its other end to the pump crank arm 42, at a position above and offset from the common pivot point 68 with the pickline arm 40. Rotation of the cam cluster 48 causes the end of the pump drive arm 40 to follow an eccentric revolution path, which in conjunction with the action of the pump crank arm 42, causes the pump piston 32 to be moved rearwardly and then returned to a starting position in a single cycle of the cluster 48. In this way, the application of a pressure difference to hold a banknote against the suction cups 28 is timed to coincide with movement of those cups from a pick-up position to a release position. Likewise, release of the pressure difference in the return stroke of the piston 18 is timed to coincide with movement of the cups from the release position to the pick-up or re-start position. Hence in one stroke and return cycle of the pump piston 18 a banknote 12 can be picked from the dispensing cassette 16 and transferred to a dispensing mechanism 38.

The vacuum pick mechanism in which the invention is embodied is simple and effective. Also, because each mechanism in a stack can be independently constructed, it allows a modular approach to building ATMs or other self-service terminals, as shown in FIG. 10. By avoiding the need for valves, control and timing of the drive and pump can be done mechanically, which simplifies the process and makes it more reliable. Furthermore, the overall design reduces the number of components needed, which is advantageous in an ATM environment where space is generally very restricted.

A skilled person will appreciate that variations of the disclosed arrangements are possible without departing from the invention. For example whilst the invention is described primarily with reference to banknotes, it will be appreciated that other media could be dispensed using this mechanism, such as tokens or vouchers or tickets or any other sheet of material. In addition, although an arrangement for triggering the start of a pick-up action has not been explicitly described, suitable techniques are well known in the art. Accordingly, the above description of a specific embodiment is made by way of example only and not for the purposes of limitations. It will be clear to the skilled person that minor modifications may be made without significant changes to the operation described.

Claims

1. A self-service terminal comprising: a plurality of vacuum pick mechanisms for picking media, each vacuum pick mechanism including a pump, a pickline connected to the pump, a drive mechanism for moving the pickline between a media pick position and a media release position, and a motor for driving both the pump and the drive mechanism.

2. A self-service terminal as claimed in claim 1, wherein the pump comprises a single stroke pump.

3. A self-service terminal as claimed in claim 1, wherein the pump comprises a synchronous stroke pump.

4. A self-service terminal as claimed in claim 1, wherein the drive mechanism is operable to move the pickline and drive the pump.

5. A self service terminal as claimed in claim 2, wherein the drive mechanism is operable to move the pickline between the media pick and release positions and back again in a single pump stroke cycle.

6. A self-service terminal as claimed in claim 1, wherein the motor comprises a stepper motor.

7. An automated teller machine (ATM), the ATM comprising: a plurality of vacuum pick mechanisms for picking banknotes, each vacuum pick mechanism including a pump, a pickline connected to the pump, a drive mechanism for moving the pickline between a banknote pick position and a banknote release position, and a motor for driving both the pump and the drive mechanism.

8. An ATM as claimed in claim 7, wherein the pump comprises a single stroke pump.

9. An ATM as claimed in claim 7, wherein the pump comprises a synchronous stroke pump.

10. An ATM as claimed in claim 7, wherein the drive mechanism is operable to move the pickline and drive the pump.

11. An ATM as claimed in claim 8, wherein the drive mechanism is operable to move the pickline between the banknote pick and release positions and back again in a single pump stroke cycle.

12. An ATM as claimed in claim 7, wherein the motor comprises a stepper motor.

13. A valveless vacuum pick mechanism for picking media, the mechanism comprising: a pump; a valveless pickline connected to the pump; a drive mechanism for moving the pickline between a media pick position and a media release position; and a motor for driving both the pump and the drive mechanism.

14. A valveless vacuum pick mechanism as claimed in claim 13, wherein the pump comprises a single stroke pump.

15. A valveless vacuum pick mechanism as claimed in claim 13, wherein the pump comprises a synchronous stroke pump.

16. A valveless vacuum pick mechanism as claimed in claim 13, wherein the drive mechanism is operable to move the pickline and drive the pump.

17. A valveless vacuum pick mechanism as claimed in claim 14, wherein the drive mechanism is operable to move the pickline between the media pick and release positions and back again in a single pump stroke cycle.

18. A valveless vacuum pick mechanism as claimed in claim 13, wherein the motor comprises a stepper motor.