Device for turning flat mailing items through 90
The invention proposes to turn rectangular mail items of differing thicknesses and sizes and containing different page ratios through 90°. To achieve this, the mail items are conveyed away in at least one direction at right angles to the feeding direction by eccentric rollers. In order to pick up the mailing items without damaging the latter, the eccentric rollers are configured from an elastic material and include segments arranged in a non-radial manner.
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The invention relates to a device for turning flat mail items through 90° according to the pre-characterising clause of Claim 1.
The present invention relates to the field of postal automation. For automated sorting and distribution of flat mail items such as letters or leaflets, the latter are transported to their target locations—also known as destinations—within a processing and distribution centre by means of conveyors and/or conveying belts. For this purpose it is necessary for the conveying direction to be changed relative to the mail item, e.g. from a vertical conveying direction to a horizontal conveying direction or vice versa.
Transporting flat mail items is demanding in that the dimensions and manipulability of flat sortation items varies widely. On the one hand, in terms of format alone there exists an almost unlimited diversity of width, height and thickness dimensions. In addition, the packaging and stiffness of flat sortation items can also vary greatly, ranging from hard, rigid cardboard envelopes to rather soft film-packaged brochures and magazines. Unpackaged, loose leaflets are also encountered as sortation items. Due to the different sizes of rectangular mail items, it is no easy matter to deflect them from a relatively vertical conveying direction to a horizontal conveying direction at a high conveying speed. Not only does the length-to-width ratio vary comparatively greatly, but the absolute variable of length or width is also wide-ranging, as may be directly seen, for example, from the formats B6 landscape or portrait to the format C3 portrait or landscape. The problem with changing the direction of mail items at high conveying speeds is that, when they are turned through 90°, exceptionally oblong items, for example, must be conveyed away much more quickly in the longitudinal direction than they are conveyed to that deflection point. Within the meaning of this publication, for the sake of simplification only mail items will now be referred to, flat mail items such as letters, leaflets, samples in preferably rectangular format being subsumed under the term “mail items”.
U.S. Pat. No. 6,234,468B1 “Dual Pocket right angle turn for an envelope transport system” proposes a device which conveys envelopes supplied in two rows into a single row, said single row being at an angle of 90° relative to the two rows. However, this device is only suitable for mail items that are to a certain extent homogeneous in terms of size, proportions and mass.
The object of the present invention is therefore to specify a device for changing the conveying direction of flat mail items so as to allow a high throughput irrespective of the masses and proportions of the mail items.
This object is achieved according to the invention by the device set forth in Claim 1.
Conveying the mail items away by means of eccentric rollers ensures that mail items having a wide variety of sizes are reliably transferred from the first direction to a second direction orthogonal thereto, the throughput rate being directly proportional to the rotation speed of the eccentric rollers and therefore easily adjustable. By making eccentric rollers actuatable in two rotational directions corresponding to the second direction, in order to convey the mail items away accordingly to two different points, either the mail items can be further processed generally on two further paths, or “mavericks” such as double withdrawals can be easily removed from onward conveyance.
Advantageous embodiments of the invention are set forth in further Claims.
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- i) Due to the fact that the eccentric rollers and the cross belt are mechanically coupled via a free-wheel, so that at higher conveying speed of the eccentric rollers the cross belt is likewise accelerated to the higher conveying speed and the second motor driving the cross belt is not thereby entrained to the higher conveying speed, the mail items are conveyed away from the deflection point reliably and without adversely affecting throughput without complex synchronisation and without the second motor driving the cross belt being thereby entrained to the higher speed (Claim 8).
- ii) Due to the fact that there is provided a nubbed belt containing supports in order to feed the mail items to the deflection point in the first direction, the mail items can be fed to said deflection point in a defined manner, resulting in precise onward conveyance with the eccentric rollers (Claim 10).
- iii) Due to the fact that a feeder (2) is rotationally coupled to the nubbed belt (4) in order to ensure a defined position of the mail items when they are conveyed away by the eccentric rollers (11), the coupling can be provided in such a way that a mail item can be transferred by the feeder via the conveying belt onto the nubbed belt slightly above the support, e.g. 2 cm, so that during onward transportation with the nubbed belt the mail item falls a very short distance onto the support and without rebounding. This results in a defined i.e. horizontal position for conveying away with the eccentric roller means in the transverse direction (Claim 11).
The invention will now be explained in greater detail in an exemplary manner with reference to the accompanying drawings in which:
The translation for the rotationally synchronously coupled conveying belt 3, the take-off drum 6 and the nubbed belt 4 and the arrangement of the supports 5 on the nubbed belt 4 must be selected such, when it is being transferred from the conveying belt 3 to the nubbed belt 4, a mail item comes into the region of the nubbed belt 4 about 20 mm above a support 5. The mail items then drops onto the support 5 in the conveying direction. This tightly limited drop ensures that the mail item does not rebound on impact or here on reaching the support 5, thereby ensuring a defined position of the mail item at the moment of pickup by the eccentric roller 11. It is particularly advantageous that the actuation of the eccentric roller 11 takes effect for the mail item at precisely the moment when the mail item has reached the position for horizontal onward conveyance. This means that actuation of the drive motor 14 must take place shortly prior to reaching this position. Thanks to the permanently selected translation, the actuation of the drive motor 14 can be derived directly from the position of a support 5 and the prior pickup of a mail items by a gripper 7. A control actuates the grippers 7; without this actuation, the mail items remain on a stack in the feeder 2. With the supports it can also be achieved that a mail item is not picked up by a single eccentric roller in the case of e.g. two offset eccentric rollers and possibly “bumps” its way through.
Using the two rotational directions of the eccentric rollers, the following advantages can be realised: i) This can be used, for example, when a double withdrawal occurs, to feed this out in the other direction in order to then feed in the fed-out mail item manually to a suitable position in the normal sorting or distribution process in the sense of a re-feed. ii) It is also possible to operate the eccentric rollers generally in both directions, e.g. alternating, and if necessary to provide a cross belt 21 in both directions D2 and D2′. The constructive embodiment of the eccentric roller 11 must be provided in such a way that the segment arrangement ensures the aforesaid elasticity in both rotational directions, e.g. by means of an S-shaped arrangement of the segments.
The abovementioned synchronisation of conveying belt 3, nubbed belt 4 and take-off drum 6 is freely combinable with the above-mentioned special implementations in respect of the bidirectional actuation of the eccentric rollers 11 and of the implementations of said eccentric rollers 11 as well as with the arrangement of a cross belt 21 for conveying away the mail items.
LIST OF REFERENCE CHARACTERS USED
- 1 Conveying device
- 2 Feeder
- 3 Conveying belt
- 4 Nubbed belt
- 5 Support on nubbed belt
- 6 Take-off drum
- 7 Gripper, actuatable
- 10 Deflection point
- 11 Eccentric roller
- 12 Peripheral, eccentric part
- 13 Flat section
- 13.1 First flat section
- 13.2 Second flat section
- 14 First drive motor, stepping motor
- 15 Second drive motor
- 16 First free-wheel
- 17 Second free-wheel
- 18 Toothed belt pulley
- 19 Roller, opposite eccentric roller
- 20 Segment, spoke
- 21 Cross belt
- 22 Cylinder
- 23 Bearing
- D1 Conveying direction of nubbed belt to deflection point
- D2, D2′ Conveying directions from deflection point, orthogonal with respect to feeding direction D1.
- F16 Engagement point of free-wheel 16
- F17 Engagement point of free-wheel 17
Claims
1. A device for turning flat mail items, comprising:
- means for feeding mail items individually in a first direction to a deflection point and individually in at least one second direction away from the deflection point, the second direction being essentially orthogonal to the feeding direction,
- the deflection point comprising at least one eccentric roller having a peripheral part with at least one flattened position and the eccentric roller is actuatable in two rotational directions corresponding to the second direction in order to convey the mail items away according to two different positions.
2. The device according to claim 1,
- wherein the peripheral part comprises elastic material.
3. The device according to claim 1,
- further comprising means for carrying non-flattened section of segments in a non-radial direction.
4. The device according to claim 3,
- wherein the segments are arranged in an S-shape.
5. The device according to claim 1,
- further comprising a cross belt arranged in the second direction to the eccentric rollers in order to convey away the mail items.
6. The device according to claim 5,
- further comprising another cross belt arranged in the opposite second direction to the eccentric rollers in order to convey away the mail items.
7. The device according to claim 5,
- further comprising a first motor arranged to drive the eccentric rollers and a second motor arranged to drive the cross belt.
8. The device according to claim 7,
- further comprising a free wheel mechanically coupled to the eccentric rollers and the cross belt so that at higher conveying speeds of the eccentric rollers the cross belt is likewise accelerated to the higher conveying speed and that the second motor is not thereby entrained to the higher conveying speed.
9. The device according to claim 7,
- wherein the first motor is a stepping motor.
10. The device according to claim 1,
- further comprising a nubbed belt comprising supports and arranged so as to feed the mail items in the first direction to the deflection point.
11. The device according to claim 10,
- further comprising a feeder rotationally coupled to the nubbed belt in order to ensure a defined position of the mail items when they are conveyed away by the eccentric rollers.
12. The device according to claim 1,
- wherein the eccentric rollers are actuatable the moment a mail items reaches the conveying away position.
Type: Application
Filed: May 16, 2005
Publication Date: Sep 15, 2005
Applicant: SIEMENS SCHWEIZ AG (ZURICH)
Inventors: Manfred Boller (Hohentengen), Beat Fritsche (Greifensee), Wilhelm Maier (Wettingen), Thomas Zimmermann (Wutoeschingen)
Application Number: 11/129,768