CA1105507A - Apparatus for slowing-down sheets fed to a pile storage means - Google Patents
Apparatus for slowing-down sheets fed to a pile storage meansInfo
- Publication number
- CA1105507A CA1105507A CA317,713A CA317713A CA1105507A CA 1105507 A CA1105507 A CA 1105507A CA 317713 A CA317713 A CA 317713A CA 1105507 A CA1105507 A CA 1105507A
- Authority
- CA
- Canada
- Prior art keywords
- storage means
- sheets
- conveying
- braking device
- discharge roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
- G08B13/1672—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using sonic detecting means, e.g. a microphone operating in the audio frequency range
Abstract
ABSTRACT
Apparatus for slowing down and overlapping sheets or sets of sheets to be deposited as a pile in storage means, fed by conveying means at a predetermined conveying speed, includes a braking device acting on the rear areas of the sheets and located below the conveying plane before the storage means. The action of which braking device, in particular a suctional force, can be adjusted in relation to the conveying speed. The braking device comprises a discharge roller provided with recesses and located directly before the storage means. Suction bars are located in the recesses in the discharge roller and extending approximately to the crown thereof. Below the bars, blowing nozzles are provided in the region of the discharge roller, the blast direction of which nozzles is directed towards the storage means.
Apparatus for slowing down and overlapping sheets or sets of sheets to be deposited as a pile in storage means, fed by conveying means at a predetermined conveying speed, includes a braking device acting on the rear areas of the sheets and located below the conveying plane before the storage means. The action of which braking device, in particular a suctional force, can be adjusted in relation to the conveying speed. The braking device comprises a discharge roller provided with recesses and located directly before the storage means. Suction bars are located in the recesses in the discharge roller and extending approximately to the crown thereof. Below the bars, blowing nozzles are provided in the region of the discharge roller, the blast direction of which nozzles is directed towards the storage means.
Description
The invention relates to an apparatus for slowing-down and over-lapping sheets or sets of sheets to be deposited as a pile in a storage means.
In a known apparatus of this type (German Patent Specifications 1 917 616 and 2 000 078) individual sheets delivered from a transverse cut-ter are supplied to the storage means between upper ant lower conveyor belts.
On the feed path between the next to the last and the last lower belt of the storage means, a braking device is provided in the form of a suction header with suction holes which can be covered. By opening and closing the suction holes in synchronism with the feed of sheets, this braking device acts on ~the rear areas of the sheets. Since the sheet is not only retarded by the braking 'tevice, but also guided downwards, the beginning of the next following sheet may slide over the preceding sheet, thus causing overlapping. The sheets overlapped in this way are then conveyed further by the last lower conveyor belt extending as far as the storage means and the upper .:onveyor belt possibly extending over the storage means. When the apparatus is operating at maximum capacity, despite the braking of the sheets achieved by the braking device, the residual conveying speed is too great to ensure reliable prevention of damage to the sheets due to striking of their front edges against the stop of the storage means. On the other hand, to apply a greater braking effect with the braking device would involve a substantial reduction in the capacity of the apparatus.
The object of the invention is to provide an apparatus of the aforesaid type, which can be operated at high capacity and in which there is less danger of the sheets being damaged on their front edges due to excessively hard impact on the stop of the storage means.
The invention provides apparatus for slowing down and overlapping ~- sheets o paper to be deposited as a pile in a storage means, the ~F ' llOSS~7 sheets being fed by conveying means from an inlet to the storage means at a predetermined conveying speed, said apparatus including: a braking device acting on the rear areas of the sheets and located below the conveying plane and upstream of the storage means, the action of said braking device being adjustable in relation to the conveying speed; said braking device comprising a discharge roller provided with recesses and located directly before the storage means, suction bars being located in the recesses in the discharge roller and extending approximately to the crown thereof, blowing nozzles being provided in the region of the discharge roller below said bars to direct a flow of air towards the storage means.
Owing to the provision of the braking device directly before the storage means, the sheets can be conveyed at maximum speed over virtually the entire feed section. The combination of discharge roller with tangent conveyor belts, suction bars and blowing nozzles ensures troublefree a~d reliabl0 slowing down from the rear area of the sheet. The blowing nozzles produce a cushion of air between the sheets already deposited and the sheet being slowed-down, so that the sheet is slowed-down exclusively from its rear area, floating on a cushion of air and is thus kept rigid. }-lowever, the suction/braking device according to the invention not only allows a higher capacity of the apparatus, but also facilitates a more compact construction than the known a M aratus.
Preferably, the conveying means, in particular a conveyor belt or set of conveyor belts located above the conveying plane extends into the region of, in particular to the end of the storage means. This embodiment thus assisSs conveyance of the leading edge of the sheet and help to keep the sheet rigid during the braking process.
However, in this embodiment, since there is a tendency for the sheets or sets of sheets to stick to the conveying means as a result of llass~7 adhesion or of electrostatic charges, further blowing nozzles can be provided directly before the storage means and below the conveying plane, which nozzles have a blowing direction directed towards the rear areas of the sheet to be tepositet and blowing nozzles may also be provitet above the storage means in the front region of the latter, which nozzles have a blow-ing direction pointing townwards onto the front areas of the sheet to be deposited. In this case, the blowing nozzles blowing towards the rear areas can be identical to the blowing nozzles below the suction bars in the region of the tischarge roller. If the conveying means consist of spaced individual belts or strips, the blowing nozzles, in particular blowing bars are appropriately located in the gaps therebetween. An apparatus of this type with nozzles blowing onto the rear ant front areas of the sheets can not only be used in conjunction with the suction/braking device according to the invention, but quite generally if the conveying means extend over the storage means and there is a tendency for the sheets to stick to the conveying means owing to adhesion or an electrostatic charge. In such cases, the sheets are deposited in a Teliable and troublefree manner by means of the blowing air.
An embodiment of invention is described in detail hereafter by way of example only, with reference to the drawings wherein:
Figure 1 shows diagrammatically and in side view, an apparatus for slowing-down and overlapping sheets to be conveyed to storage means;
Figure 2 shows to an enlarged scale a braking device of the apparatus accorting to figure 1, directly preceding the storage means; and Figure 3 shows the storage means of figure 1 in plan view.
Web material 3 is cut into individual sheets 4 by a transverse cutter, consisting of an upper cutter roller 1 and lower cutter roller 2.
The sheets are conveyet in the direction of storage means 7 between upper 11~3~
and lower convcyor belts 5, G ~uided over rollers. ~ braking device 8 is ~rovidcd bclow the conve~ing plane between thc end of the lower conveyor bclt (, (whicll prcfcrahly consists of several spaced apart individual belts) and the storag~c ~cans 7. In order that the sheets arriving a~ a relatively higll conveying spee~ do not follow the lower conveyor belts 6 at the rear guide roller, lut pass into the braking device 8! a triangul~r hollow bar 9 is provided in the upper region of the guide roller on the discharge side~
By means of jets of air directed tangentially in the feed direction of the guided conveyor belt 6, the bar effects parting of the front edges of the sheets from this conveyor belt and urges them towards the conveyor belt 5, the latter extending beyond the braking device ~.
The brakin~ device 8 (Figure 2) consists of a discharge roller 10, which is provided with a plurality of recesses 11. Like the teeth of a comb, suction bars 13 provided with suction openings 12 connected to a common suction header or box 14, project into these recesses 11. The suction bars 13 extend approximately to the crown of the discharge roller 10 Below the suction bar 13, a blowing nozzle 15 is ~rovided in each recess 11 J which nozzles blow in the direction of the storage means, i.e.
towards the rear areas of the sheets to be deposited. The discharge roller 10, suction bars 13 with the common suction box 14 and the blowing nozzles 15 are located in a common support 16 and are ver~ically adjustable by means of an eccentric 17 (Figure 1).
The storage means 7 consists of a vertically movable platform 19 sUpporting a pallet 18, a stop 20 for the front edges of the sheets, lateral guide plates 21 and a front vibrating plate 22.
The conveyor belt 5 ex~ending above the storage means 7 consists of a plurality of individual belts spaced apart side~ y-side. Iocated between the belts are blowing bars 23 with nozzles which blow downwards on ~l~)SS~7 the sheets to be deposited. l`he blowing bars 23 are supported by a common hollow bar 24, through which they are supplied with air.
The apparatus illustrated operates as follows:
The sheets introduced into the feed section by the transverse cut-ter are retained between the upper and lower conveyor belts 5, 6 and con~eyed at a high speed in the direction of the storage means 7. By means of the blowing air escaping from the hollow bar 9 at the end of the conveyor belts 6, the sheets are detached from the belts 6 and pressed against the extended upper conveyor belt 5. While the front and central areas of the sheet are passing over the braking device 8, the latter remains inoperative. It is only actuated when the rear area is located above the braking device 8. To effect this a sensor 25 (Figure 1~ is located on the feed section, which sensor opens the suction openings 12 of the suction bars 13 through a control device. The means by which the suction effect at the suction open-ings 12 of the suction bars 13 is started and stopped, can be a laterally movable slide plate 26, as is known from Ge~man Patent Specification 1 917 ~16. When the braking device 8 is actuated, the rear ends of the sheets are sucked down onto the suction bars 13 and thus slowed-down. The braking effect can be adjusted both by the level of the reduced pressure in the suction box 14 as well as by the duration of the suction effect.
The sheets are only slowed to an extent such that after leaving the discharge roller 10, their residual kinetic energy is sufficient to allow them to reach the stop 20 without damage and to abut against the latter. The sheets must also be guided reliably during braking. This guiding is effected by the discharge roller 10 in conjunction with the conveyor belts 5, which are tangential to the roller 10. To avoid the front edges of the sheets being slowed-down before reaching the stop 20 by frictional contact with the sheets already deposited, the blowing nozzles 15 deliver air between the 1 16}~5~7 moving sheet and the sheet already deposited, so that the moving sheet floats on a cushion of air.
Thc hraking device is not actuated when the sheets are conveyed at a lower speed, i.c. ~hen the machine is started-up. Only when a predeter-mined conveying speed is exceeded is the sheet braked by reduced pressure from the suction box 14. The speed at which braking is initiated depends on the sheet material being handled. As the conveying speed increases, the vacuum in the suction box is increased in proportion to the speed.
In this way it is ensured that the sheet can be conveyed reliably to the stop at virtually any speed, but comes into contact with the latter at a speed which does not damage the sheet.
- t, -
In a known apparatus of this type (German Patent Specifications 1 917 616 and 2 000 078) individual sheets delivered from a transverse cut-ter are supplied to the storage means between upper ant lower conveyor belts.
On the feed path between the next to the last and the last lower belt of the storage means, a braking device is provided in the form of a suction header with suction holes which can be covered. By opening and closing the suction holes in synchronism with the feed of sheets, this braking device acts on ~the rear areas of the sheets. Since the sheet is not only retarded by the braking 'tevice, but also guided downwards, the beginning of the next following sheet may slide over the preceding sheet, thus causing overlapping. The sheets overlapped in this way are then conveyed further by the last lower conveyor belt extending as far as the storage means and the upper .:onveyor belt possibly extending over the storage means. When the apparatus is operating at maximum capacity, despite the braking of the sheets achieved by the braking device, the residual conveying speed is too great to ensure reliable prevention of damage to the sheets due to striking of their front edges against the stop of the storage means. On the other hand, to apply a greater braking effect with the braking device would involve a substantial reduction in the capacity of the apparatus.
The object of the invention is to provide an apparatus of the aforesaid type, which can be operated at high capacity and in which there is less danger of the sheets being damaged on their front edges due to excessively hard impact on the stop of the storage means.
The invention provides apparatus for slowing down and overlapping ~- sheets o paper to be deposited as a pile in a storage means, the ~F ' llOSS~7 sheets being fed by conveying means from an inlet to the storage means at a predetermined conveying speed, said apparatus including: a braking device acting on the rear areas of the sheets and located below the conveying plane and upstream of the storage means, the action of said braking device being adjustable in relation to the conveying speed; said braking device comprising a discharge roller provided with recesses and located directly before the storage means, suction bars being located in the recesses in the discharge roller and extending approximately to the crown thereof, blowing nozzles being provided in the region of the discharge roller below said bars to direct a flow of air towards the storage means.
Owing to the provision of the braking device directly before the storage means, the sheets can be conveyed at maximum speed over virtually the entire feed section. The combination of discharge roller with tangent conveyor belts, suction bars and blowing nozzles ensures troublefree a~d reliabl0 slowing down from the rear area of the sheet. The blowing nozzles produce a cushion of air between the sheets already deposited and the sheet being slowed-down, so that the sheet is slowed-down exclusively from its rear area, floating on a cushion of air and is thus kept rigid. }-lowever, the suction/braking device according to the invention not only allows a higher capacity of the apparatus, but also facilitates a more compact construction than the known a M aratus.
Preferably, the conveying means, in particular a conveyor belt or set of conveyor belts located above the conveying plane extends into the region of, in particular to the end of the storage means. This embodiment thus assisSs conveyance of the leading edge of the sheet and help to keep the sheet rigid during the braking process.
However, in this embodiment, since there is a tendency for the sheets or sets of sheets to stick to the conveying means as a result of llass~7 adhesion or of electrostatic charges, further blowing nozzles can be provided directly before the storage means and below the conveying plane, which nozzles have a blowing direction directed towards the rear areas of the sheet to be tepositet and blowing nozzles may also be provitet above the storage means in the front region of the latter, which nozzles have a blow-ing direction pointing townwards onto the front areas of the sheet to be deposited. In this case, the blowing nozzles blowing towards the rear areas can be identical to the blowing nozzles below the suction bars in the region of the tischarge roller. If the conveying means consist of spaced individual belts or strips, the blowing nozzles, in particular blowing bars are appropriately located in the gaps therebetween. An apparatus of this type with nozzles blowing onto the rear ant front areas of the sheets can not only be used in conjunction with the suction/braking device according to the invention, but quite generally if the conveying means extend over the storage means and there is a tendency for the sheets to stick to the conveying means owing to adhesion or an electrostatic charge. In such cases, the sheets are deposited in a Teliable and troublefree manner by means of the blowing air.
An embodiment of invention is described in detail hereafter by way of example only, with reference to the drawings wherein:
Figure 1 shows diagrammatically and in side view, an apparatus for slowing-down and overlapping sheets to be conveyed to storage means;
Figure 2 shows to an enlarged scale a braking device of the apparatus accorting to figure 1, directly preceding the storage means; and Figure 3 shows the storage means of figure 1 in plan view.
Web material 3 is cut into individual sheets 4 by a transverse cutter, consisting of an upper cutter roller 1 and lower cutter roller 2.
The sheets are conveyet in the direction of storage means 7 between upper 11~3~
and lower convcyor belts 5, G ~uided over rollers. ~ braking device 8 is ~rovidcd bclow the conve~ing plane between thc end of the lower conveyor bclt (, (whicll prcfcrahly consists of several spaced apart individual belts) and the storag~c ~cans 7. In order that the sheets arriving a~ a relatively higll conveying spee~ do not follow the lower conveyor belts 6 at the rear guide roller, lut pass into the braking device 8! a triangul~r hollow bar 9 is provided in the upper region of the guide roller on the discharge side~
By means of jets of air directed tangentially in the feed direction of the guided conveyor belt 6, the bar effects parting of the front edges of the sheets from this conveyor belt and urges them towards the conveyor belt 5, the latter extending beyond the braking device ~.
The brakin~ device 8 (Figure 2) consists of a discharge roller 10, which is provided with a plurality of recesses 11. Like the teeth of a comb, suction bars 13 provided with suction openings 12 connected to a common suction header or box 14, project into these recesses 11. The suction bars 13 extend approximately to the crown of the discharge roller 10 Below the suction bar 13, a blowing nozzle 15 is ~rovided in each recess 11 J which nozzles blow in the direction of the storage means, i.e.
towards the rear areas of the sheets to be deposited. The discharge roller 10, suction bars 13 with the common suction box 14 and the blowing nozzles 15 are located in a common support 16 and are ver~ically adjustable by means of an eccentric 17 (Figure 1).
The storage means 7 consists of a vertically movable platform 19 sUpporting a pallet 18, a stop 20 for the front edges of the sheets, lateral guide plates 21 and a front vibrating plate 22.
The conveyor belt 5 ex~ending above the storage means 7 consists of a plurality of individual belts spaced apart side~ y-side. Iocated between the belts are blowing bars 23 with nozzles which blow downwards on ~l~)SS~7 the sheets to be deposited. l`he blowing bars 23 are supported by a common hollow bar 24, through which they are supplied with air.
The apparatus illustrated operates as follows:
The sheets introduced into the feed section by the transverse cut-ter are retained between the upper and lower conveyor belts 5, 6 and con~eyed at a high speed in the direction of the storage means 7. By means of the blowing air escaping from the hollow bar 9 at the end of the conveyor belts 6, the sheets are detached from the belts 6 and pressed against the extended upper conveyor belt 5. While the front and central areas of the sheet are passing over the braking device 8, the latter remains inoperative. It is only actuated when the rear area is located above the braking device 8. To effect this a sensor 25 (Figure 1~ is located on the feed section, which sensor opens the suction openings 12 of the suction bars 13 through a control device. The means by which the suction effect at the suction open-ings 12 of the suction bars 13 is started and stopped, can be a laterally movable slide plate 26, as is known from Ge~man Patent Specification 1 917 ~16. When the braking device 8 is actuated, the rear ends of the sheets are sucked down onto the suction bars 13 and thus slowed-down. The braking effect can be adjusted both by the level of the reduced pressure in the suction box 14 as well as by the duration of the suction effect.
The sheets are only slowed to an extent such that after leaving the discharge roller 10, their residual kinetic energy is sufficient to allow them to reach the stop 20 without damage and to abut against the latter. The sheets must also be guided reliably during braking. This guiding is effected by the discharge roller 10 in conjunction with the conveyor belts 5, which are tangential to the roller 10. To avoid the front edges of the sheets being slowed-down before reaching the stop 20 by frictional contact with the sheets already deposited, the blowing nozzles 15 deliver air between the 1 16}~5~7 moving sheet and the sheet already deposited, so that the moving sheet floats on a cushion of air.
Thc hraking device is not actuated when the sheets are conveyed at a lower speed, i.c. ~hen the machine is started-up. Only when a predeter-mined conveying speed is exceeded is the sheet braked by reduced pressure from the suction box 14. The speed at which braking is initiated depends on the sheet material being handled. As the conveying speed increases, the vacuum in the suction box is increased in proportion to the speed.
In this way it is ensured that the sheet can be conveyed reliably to the stop at virtually any speed, but comes into contact with the latter at a speed which does not damage the sheet.
- t, -
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for slowing down and overlapping sheets of paper to be deposited as a pile in a storage means, the sheets being fed by conveying means from an inlet to the storage means at a predetermined conveying speed, said apparatus including: a braking device acting on the rear areas of the sheets and located below the conveying plane and upstream of the storage means, the action of said braking device being adjustable in relation to the conveying speed; said braking device comprising a discharge roller provided with recesses and located directly before the storage means, suction bars being located in the recesses in the discharge roller and extending approxi-mately to the crown thereof, blowing nozzles being provided in the region of the discharge roller below said bars to direct a flow of air towards the storage means.
2. Apparatus according to Claim 1, wherein the conveying means includes a conveyor belt located above the conveying plane and extending into the region of the storage means.
3. Apparatus according to Claim 1, wherein the conveying means extends over the storage means and above the conveying plane; directly before the storage means and below the conveying plane, blowing nozzles being provided having a blowing direction directed towards the rear areas of the sheets to be deposited, and wherein above the storage means and in the front region of the latter, further blowing nozzles are provided having a blowing direction directed downwards onto the front areas of the sheets to be deposited.
4. Apparatus according to Claim 3 wherein the conveying means consist of spaced apart individual belts or strips, said blowing nozzles being located between said belts or strips.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2755150.6 | 1977-12-10 | ||
| DE19772755150 DE2755150A1 (en) | 1977-12-10 | 1977-12-10 | Body vibration detector for alarms - has inbuilt suppressor for environmental disturbance effects and permits abnormal sounds to pass through |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1105507A true CA1105507A (en) | 1981-07-21 |
Family
ID=6025831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA317,713A Expired CA1105507A (en) | 1977-12-10 | 1978-12-11 | Apparatus for slowing-down sheets fed to a pile storage means |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1105507A (en) |
| DE (1) | DE2755150A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4322714A (en) * | 1980-11-17 | 1982-03-30 | Martek Products, Inc. | Vehicle anti-theft alarm |
| US5146208A (en) * | 1990-08-17 | 1992-09-08 | Parra Jorge M | Method and apparatus for detecting intrusion into a body of water |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3147467A (en) * | 1961-09-07 | 1964-09-01 | American District Telegraph Co | Vibration detection vault alarm system |
| CH541844A (en) * | 1971-08-25 | 1973-09-15 | Securiton Ag | Device for monitoring objects and generating an alarm signal if a break-in attempt is made |
-
1977
- 1977-12-10 DE DE19772755150 patent/DE2755150A1/en not_active Ceased
-
1978
- 1978-12-11 CA CA317,713A patent/CA1105507A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2755150A1 (en) | 1979-06-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |