GB2194040A - Paper feed control apparatus - Google Patents
Paper feed control apparatus Download PDFInfo
- Publication number
- GB2194040A GB2194040A GB08618003A GB8618003A GB2194040A GB 2194040 A GB2194040 A GB 2194040A GB 08618003 A GB08618003 A GB 08618003A GB 8618003 A GB8618003 A GB 8618003A GB 2194040 A GB2194040 A GB 2194040A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- paper
- control apparatus
- paper feed
- feed control
- 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.)
- Withdrawn
Links
- 230000035945 sensitivity Effects 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
- B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
- B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
- B65H7/125—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation sensing the double feed or separation without contacting the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
- B65H2553/41—Photoelectric detectors
Landscapes
- Controlling Sheets Or Webs (AREA)
Abstract
Paper feed control apparatus 2 for ensuring that sheets of paper 4 are fed one at a time into a machine, comprises a light source 6, light detector means 8, sensitivity control means 10 for controlling the sensitivity of the light detector means 8 such that the light detector means 8 is able to detect that amount of light that passes through one sheet of the paper 4 but not that amount of light that passes through two or more sheets of the paper 4, and paper rejector means 12 which is operated consequent upon the light detector means 8 being unable to detect the required amount of light due to the presence of two or more sheets of paper 4 in the light path. <IMAGE>
Description
SPECIFICATION
Paper feed control apparatus
This invention relates to paper feed control apparatus and it relates more especially to paper feed control apparatus for ensuring that sheets of paper are fed one at a time into a machine.
The problem of feeding sheets of paper one at a time into various types of machines is well known. The problem is especially acute in the printing industry. When two or more sheets of paper are fed at the same time into a machine, for example a printing or duplicating machine, paper jams can occur with consequent loss of production time and often also damage to machinery. Presently known devices for ensuring that the sheets of paper are fed one at a time are not effective.
It is an aim of the present invention to provide simple yet effective paper feed control apparatus for ensuring that the sheets of paper are fed one at a time into a machine.
Accordingly, this invention provides paper feed control apparatus for ensuring that sheets of paper are fed one at a time into a machine, which apparatus comprises a light source, light detector means for detecting light from the light source, sensitivity control means for controlling the sensitivity of the light detector means such that the light detector means is able to detect that amount of light that is able to pass through one sheet of the paper but not that amount of light that is able to pass through two or more sheets of the paper, and paper rejector means which is operated consequent on the light detector means being unable to detect the required amount of light due to the presence of two or more sheets of paper in a light path between the light source and the light detector means and which is effective to reject the two or more sheets of paper.
The paper feed control apparatus may include light intensity control means for controlling the intensity of light emitted from the light source.
The light intensity control means will usually be a variable resistance device but other types of light intensity control means may be employed.
Preferably, the paper feed control apparatus is such that there are two light sources and two light detector means, each light source and its associated light detector means being offset with respect to the other light source and its associated light detector means, and the two light detector means being such that they both have to sense a reduction in the level of light reception before they cause the pape rejector means to operate.
With only one light source and only one light detector means, some printed matter that is being reproduced and that has variations in the printing, alter the density and the light reception factors such that the paper rejector means has a tendency to operate when it should not operate. This possible unwanted operation of the paper rejector means with some types of printed matter is substantially eliminated by using the two light sources and the two light detector means.
The light sources may be positioned one on either side of the paper and offset by any desired distance, for example 15 mm. The two light sources should not be positioned too far apart as time is needed to effect the necessary detection and, more essentially, to effect the mechanically response required of the paper rejector means.
Preferably, the or each light source is a fluorescent tube. The use of fluorescent tubes is preferred because they are certain to extend across the width of the paper by an appreciable difference so that paper of different widths can be employed without the need to readjust the position of the light source. The fluorescent tubes are preferably 6" (15.5 mm) in length. Other types of light sources, for example bulbs, can be employed for the or each light source is desired.
The or each light detector means is preferably a photodiode. Also, preferably the light detector means detect the light at the edges of the paper.
Advantageously, the light detector means, for example photodiodes, are mounted on paper guides which guide the opposite longitudinal sides of the paper. Thus, as the paper guides are moved in or out for different widths of paper, the light detector means are also automatically moved and kept positional over the edges of the paper.
The sensitivity control means may comprise a variable resistance device.
The paper feed control apparatus may be provided with a control box having a reset button, and a knob which is rotated by-an operator to dial up a desired density number which is the equivalent to the correct amount of light that is able to pass through one sheet of the paper.
The sensitivity control means may comprise a control knob, a first indicator light which is of a first colour for indicating when only one sheet of paper is in the light path between the light source and the light detector means, and a second indicator light for indicating when two or more sheets of paper are in the light path between the light source and the light detector means.
The first indicator light may be coloured green, and the second indicator light may be coloured red.
The paper rejector means may comprise a deflector blade.
The deflector blade may be operated by a solenoid.
The paper feed control apparatus may in dude a transducer.
The present invention-also includes a machine when fitted with the paper feed control apparatus.
The machine may be any type of machine such for example as a printing, duplicating or collating machine. Generally, the machine can be any type of machine where it is required to feed only one sheet of paper at a time and not two or more sheets of paper.
An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawings in which:
Figure 1 illustrates the paper feed control apparatus; and
Figure 2 shows a circuit for use in the paper feed control apparatus shown in Fig. 1.
Referring to Fig. 1, there is shown paper feed control apparatus 2 for ensuring that sheets of paper 4 are fed one at a time into a machine (not shown). The paper feed control apparatus 2 comprises a light source in the form of a bulb 6 and light detector means in the form of a photodiode 8. The photodiode 8 is for detecting light from the bulb 6. The paper feed control apparatus 2 also comprises sensitivity control means 10 for controlling the sensitivity of the photodiode 8 such that the photodiode 8 is ableto detect that amount of light that is able to pass through one sheet of the paper 4 but not that amount of light that is able to pass through two or more sheets of the paper 4.
The paper feed control apparatus 2 further comprises paper rejecter means in the form of a deflector blade 12 which is operated by a solenoid 14 and which is connected to the solenoid 14 by an arm 16. When the solenoid 14 pulls on the arm 16, the deflector blade 12 is caused to pivot about its edge 18.
The paper feed control apparatus 2 is mains operated and it is provided with a transducer 20 for reducing the voltage appropriate to that required by the bulb 6. The transducer 20 may be arranged to give a 12-volt output. The bulb 6 can then be a 24-volt 24-watt bulb which is normally run at 12 volts but which can run up to 24 volts if desired. For example, it may be required to increase the intensity of the light coming from the bulb 6 dependent upon the thickness of the sheets of paper 4. The intensity of the light coming from the bulb 6 can be varied by light intensity control means in the form of a variable resistance device 22.
The bulb 6, the photodiode 8, the solenoid 14 and the transducer 20 are connected in circuit as shown in Fig. 1 to the sensitivity control means 10. The sensitivity control means 10 has a control knob 24. The sensitivity control means 10 also has a first indicator light 26 which is for indicating when only one sheet of paper 4 is in the light path between the- bulb 6 and the photodiode 8. The sensitivity control means 10 further has a second indicator light 28 which is for indicating when two or more sheets of paper 4 are in the light path between the bulb and the photodiode 8.
The paper feed control apparatus 2 can very easily be connected to a piece of machinery such for example as printing or duplicating machinery and it will usually be mains operated along via input leads 30. The input leads 30 will usually be provided with an on/off switch 32.
Referring now to Fig. 2, it will be seen that the first indicator light 26 is shown as a green light emitting diode, whilst the second indicator light 28 is shown as a red light emitting diode. The solenoid 14 is connected in circuit with a resistor 34 and a diode 36. The diode 36 stops back emf from the solenoid 14. The red light emitting diode 28 is connected in series with a resistor 34 and then to the solenoid 14. The green light emitting diode 26 is connected via a resistor 38 to the output of an amplifier device 40 which is known as a 741 device 40. The output of the amplifier device 40 connects via a resistor 42 to a transistor 44. The 741 amplifier device 40 amplifies the signal from the photodiode 8 which passes to the 741 amplifier device 40 along line 46. The transistor 44 is the driver transistor for the solenoid 14 as can be seen from Fig. 2. The resistances 48, 50 are circuit balancing resistances. A further resistor 52 is employed as shown.
It is to be appreciated that the embodiment of the invention described above with reference to the accompanying drawings has been given by way of example only and that modifications may be effected. Thus, for example, a different light source may be employed to the bulb 6 and a different type of sensitivity control means 10 may also be employed.
Claims (16)
1. Paper feed control apparatus for ensuring that sheets of paper are fed one at a time into a machine, which apparatus comprises a light source, light detector means for detecting light from the light source, sensitivity control means for controlling the sensitivity of the light detector means such that the light detector means is able to detect that amount of light that is able to pass through one sheet of the paper but not that amount of light that is able to pass through two or more sheets of the paper, and paper rejector means which is operated consequent upon the light detector means being unable to detect the required amount of light due to the presence of two or more sheets of paper in a light path between the light source and the light detector means and which is effective to reject the two or more sheets of paper.
2. Paper feed control apparatus according to claim 1 and including light intensity control
means for controlling the intensity of light em
itted from the light source.
3. Paper feed control apparatus according
to claim 2 in which the light intensity control
means is a variable resistance device.
4. Paper feed control apparatus according
to any one of the preceding claims and which
is such that there are two light sources and
two light detector means, each light source
and is associated light detector means being
offset with respect to the other light source
and its associated light detector means, and
the two light detector means being such that
they both have to sense a reduction in the
level of light reception before they cause the
paper rejector means to operate.
5. Paper feed control apparatus according
to any one of the preceding claims in which - the or each light source is a fiuorescent tube.
6. Paper feed control apparatus according
to any one of the preceding claims in which
the or each light detector means is a photodi
ode.
7. Paper feed control apparatus according
to claim 4 in which the light detector means
detect the light at the edges of the paper.
8. Paper feed control apparatus according
to claim 4 or claim 7 in which the light detec
tor means are mounted on paper guides which
guide the opposite longitudinal sides of the
paper.
9. Paper feed control apparatus according
to any one of the preceding claims in which
the sensitivity control means comprises a vari
able resistance device.
10. Paper feed control apparatus according
to any one of the preceding claims and includ
ing a control box having a reset button, and a
knob which is rotated by an operator to dial
up a desired density number which is equiva
lent to the correct amount of light that is able
to pass through one sheet of the paper.
11. Paper feed control apparatus according
to any one of the preceding claims in which
the sensitivity control means comprises a con
trol knob, a first indicator light which is of a
first colour for indicating when only one sheet
of paper is in the light path between the light
source and the light detector means, and a
second indicator light for indicating when two
or more sheets of paper are in the light path
between the light source and the light detec
tor means.
12. Paper feed control apparatus according
to any one of the preceding claims in which
the paper rejector means comprises a deflec
tor blade.
13. Paper feed control apparatus according
to claim 12 in which the deflector blade is
operated by a solenoid.
14. Paper feed control apparatus substan
tially as herein described with reference to the
accompanying drawings.
15. A machine when fitted with the paper
feed control apparatus as claimed in any one of the preceding claims.
16. A machine according to claim 15 and which is a printing, duplicating or collating machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08618003A GB2194040A (en) | 1986-07-23 | 1986-07-23 | Paper feed control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08618003A GB2194040A (en) | 1986-07-23 | 1986-07-23 | Paper feed control apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8618003D0 GB8618003D0 (en) | 1986-08-28 |
| GB2194040A true GB2194040A (en) | 1988-02-24 |
Family
ID=10601575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08618003A Withdrawn GB2194040A (en) | 1986-07-23 | 1986-07-23 | Paper feed control apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2194040A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0445835A1 (en) * | 1990-03-08 | 1991-09-11 | Komori Corporation | Method and apparatus for controlling a multiple sheet detection function |
| FR2660913A1 (en) * | 1990-04-17 | 1991-10-18 | Tokyo Aircraft Instr Co | APPARATUS FOR DETECTING A DOUBLE SHEET FEEDING. |
| US6595510B2 (en) * | 2000-01-18 | 2003-07-22 | Currency Systems International | Note feeder |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3578315A (en) * | 1968-10-04 | 1971-05-11 | Honeywell Inf Systems | Overlapped document detector |
| GB1342838A (en) * | 1970-04-06 | 1974-01-03 | Xerox Corp | Detection system for superposed sheets |
| GB1342656A (en) * | 1970-04-06 | 1974-01-03 | Xerox Corp | Multiple sheet detection system |
| GB2011613A (en) * | 1977-12-28 | 1979-07-11 | Brandt Pra Inc | Electronic counting and control means for document handling devices and incorporating doubles detection means document illumination means and counting circuitry utillizing plural counters and decoders for establishing documents length and the gaps between documents and overlapping conditions therebetween |
| US4395127A (en) * | 1980-09-11 | 1983-07-26 | The United States Of America As Represented By The Secretary Of The Treasury | Optical paper detector |
| EP0149699A1 (en) * | 1984-01-24 | 1985-07-31 | Komori Printing Machinery Co., Ltd. | Double sheet detection method and apparatus of sheet-fed rotary press |
-
1986
- 1986-07-23 GB GB08618003A patent/GB2194040A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3578315A (en) * | 1968-10-04 | 1971-05-11 | Honeywell Inf Systems | Overlapped document detector |
| GB1342838A (en) * | 1970-04-06 | 1974-01-03 | Xerox Corp | Detection system for superposed sheets |
| GB1342656A (en) * | 1970-04-06 | 1974-01-03 | Xerox Corp | Multiple sheet detection system |
| GB2011613A (en) * | 1977-12-28 | 1979-07-11 | Brandt Pra Inc | Electronic counting and control means for document handling devices and incorporating doubles detection means document illumination means and counting circuitry utillizing plural counters and decoders for establishing documents length and the gaps between documents and overlapping conditions therebetween |
| US4395127A (en) * | 1980-09-11 | 1983-07-26 | The United States Of America As Represented By The Secretary Of The Treasury | Optical paper detector |
| EP0149699A1 (en) * | 1984-01-24 | 1985-07-31 | Komori Printing Machinery Co., Ltd. | Double sheet detection method and apparatus of sheet-fed rotary press |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0445835A1 (en) * | 1990-03-08 | 1991-09-11 | Komori Corporation | Method and apparatus for controlling a multiple sheet detection function |
| FR2660913A1 (en) * | 1990-04-17 | 1991-10-18 | Tokyo Aircraft Instr Co | APPARATUS FOR DETECTING A DOUBLE SHEET FEEDING. |
| US6595510B2 (en) * | 2000-01-18 | 2003-07-22 | Currency Systems International | Note feeder |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8618003D0 (en) | 1986-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |