EP0056955A2 - Paper feeding method in a printer - Google Patents
Paper feeding method in a printer Download PDFInfo
- Publication number
- EP0056955A2 EP0056955A2 EP82100237A EP82100237A EP0056955A2 EP 0056955 A2 EP0056955 A2 EP 0056955A2 EP 82100237 A EP82100237 A EP 82100237A EP 82100237 A EP82100237 A EP 82100237A EP 0056955 A2 EP0056955 A2 EP 0056955A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- feeding
- elements
- bar
- guiding
- pins
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/26—Pin feeds
- B41J11/32—Adjustment of pin wheels or traction elements, e.g. laterally
Definitions
- the present invention relates to a paper feeding mechanism for printers such as those used in data processing systems where a printing form with perforations on the sides or a printing support without side perforations can be used as a printing support.
- printers model 730 - 737 manufactured by CENTRONICS firm An embodiment of such solution is given, for instance, by printers model 730 - 737 manufactured by CENTRONICS firm.
- Such printers are provided with one plastic feeding element fixed on driving bar rotated by a solenoid or by a step motor.
- Such feeding element comprises a cylindrical central portion having several grooves where rubber rings are housed and by two lateral pin wheels cooperating with pads which keep the printing form perforations engaged with the pins.
- the cylindrical central part provides for the feeding of continuous printing form without lateral perforation; to this purpose pressure rolls are also provided which press the printing form against the rubber rings during operation in order to assure the friction required to the paper feeding.
- the described example of paper feeding mechanism can.operate with non perforated printing forms having different width (the maximum ) width is however determined by the distance between the pin wheels) but it has the disadvantage of being unable to handle side perforated printing forms having different sizes, as the distance between the pin wheels cannot be changed.
- a first mechanism is supplied to assure the friction feeding of non perforated continuous printing forms (which may have different width). It consists in a feeding roll fixed to a first tractor bar and cooperating with pressure rollers.
- a second mechanism assures the feeding of the continuous side perforated printing form. It consists in two pin wheels cooperating with pads and mounted on a second tractor bar.
- the pin wheels may be axially moved along the second bar and locked in a determined position, thus allowing to operate with printing forms having different width.
- the tractor bars are actuated by the same motor by means of a belt pulley or gear transmission system.
- the present invention overcomes such disadvantages and provides a simple and unexpensive paper feeding mechanism which allows to operate . with different sizes of both side perforated printing forms and unperforated printing forms.
- the paper feeding mechanism comprises a pair of feeding elements each one coupled to a pad.
- Each feeding element and the corresponding pad form a couple which is able to operate with both non perforated printing forms as well as side perforated printing forms.
- each couple feeding element-pad may be axially moved along a tractor bar and locked in any desired position: thus it is possible to operate with printing forms of different width, up to a maximum width imposed by the printer structure.
- Fig. 1 is a perspective view of a printer having a paper feeding mechanism according to the invention.
- the printer comprises a frame, a printing mechanism and a paper feeding mechanism.
- the frame is formed, for instance, by two sides plates 1, 2 and a base 3.
- the printing mechanism may be formed, for instance, by two guiding rods mounted between the sides, on which a printing carriage slideably moves.
- a printing head for instance of the needle type, is mounted on the printing carriage and allows to obtain the printing of several types by a dot composition, obtained through the energization of several needles and the combined transversal movement of the head and carriage.
- the printing is performed against a platen 4 on which the printing support moves.
- Platent 4 is fixed to sides 1, 2.
- the feeding mechanism object of the invention comprises a prismatic driving bar 13, a positioning and guiding rod 14, two cylindrical feeding elements 7, 8, two positioning and guiding arms 9, 10 and two pads 11, 12 coupled to the feeding elements.
- the driving bar 13 is pivoted on sides 1, 2 by means of bushings and it is rotated by a step motor or by a low inertia motor 15.
- Positioning and guiding rod 14. is fixed to sides 1, 2 of the frame.
- Two feeding elements 7, 8 are mounted on tractor bar 13 and may move along its axis.
- Each of such feeding elements is a cylinder, preferably in plastic material, which is provided along a first circumference with pins 8A and along a second circumference with a groove 8B where one or more rubber rings (preferably 2 rings) are housed.
- Circunferential portions of the feeding elements which are provided with rings are located internally relative to the circunferential portions provided with pins and considering as reference the direction of bar 13.
- Fig. 2 shows in detailt the exploded perspective view of a positioning and guiding arm 10 and its relation with feeding element 8 and the corresponding pad 12.
- the guiding arm is substantially constituted by a body shaped in form of connecting rod and provided with an arm 10A, a small end 10B,a big end 10C.
- the circular opening in the big end receives a hub 50 integral and coaxial to the cylindrical feeding element 8.
- Hub 50 as well as the cylindrical feeding element, has a prismatic axial opening 51 where guiding bar 13 is inserted.
- Hub 50 is further provided with a cylindrical groove 52, intended to house an elastic retaining ring 53 ( Benzing, Seeger ring or alike).
- feeding element 8 and guiding arm 10 are mutually pivoted so that the relative rotation of the two element according to the ro - tation axis of the tractor bar is permitted,but any relative axial movement is prevented.
- The-small end 10B of the guiding arm is engaged with guiding rod 14 and is free to axially move along this one.
- Pad 12 is provided with a pair of drilled tabs 12A, 12B hinged --to a corresponding tab 31 of end 10C by means of a pin 30.
- Pad 12 is firmly kept in a working position or in an opened position by a return spring 32, suitably fixed to an eye or pin of the pad, on one side, and to an eye or pin of end 10C, on the other one.
- pad 12 In working position, pad 12 lays on a peripheral portion of feeding element 8.
- An elongated opening 33 or a groove is provided in the pad zone which, when pad is in working position, gets in contact with the toothed zone of the feeding element, thus avoiding any interference between the pad and the pins.
- the pressure rollers 34, 35 are hinged, by means of two pins 36, 37, on the pad side opposite to the side hinged to end' 10 C .
- the rollers are housed in suitable pad seats and, when the pad is in working position, they lay on the rubber rings 36, housed into the groove of feeding element 8.
- Their rotation axis is substantially parallel to the rotation axis of the guiding rod.
- the rotation of the feeding elements thus causes the movement of the form.
- the set of feeding element 8, pad 12 and positioning and guiding arm 10, forms-a traction group.
- the traction group formed by feeding element 7, pad 11 and positioning and guiding arm 9 is mirror like identical to the first one.
- the two traction groups may be assembled from identical elements.
- the traction groups are axially positioned along the guiding rod and the driving bar in order that the side perforations engage with the pins of the two feeding elements.
- the guiding pads prevent disengagement of the side perforations from the feeding pins.
- the feeding action exerted by the pins is further aided by the feeding action exerted on the form side portions by the rubber rings and due to the pressure exerted by the pressure rollers.
- the two traction groups are axially positioned in order the form edges do not interfere with the feeding element pins while the feeding action is exerted by the rubber rings.
- inventions may be applied to feeding mechanisms where toothed belts can be used instead of pin wheels.
Landscapes
- Handling Of Sheets (AREA)
Abstract
Description
- The present invention relates to a paper feeding mechanism for printers such as those used in data processing systems where a printing form with perforations on the sides or a printing support without side perforations can be used as a printing support.
- It is known that most users of printers for data processing system require that such printers be able to operate both with perforated printing supports and with continuous printing forms without lateral perforations.
- The printer manufacturers have tried to satisfy such need by the offering of paper feeding mechanisms having the required operative flexibility.'
- Practically, means able to assure the friction feeding of the continuous printing form without lateral perforations have been associated to the known pin wheels suitable for the feeding of the side perforated forms.
- An embodiment of such solution is given, for instance, by printers model 730 - 737 manufactured by CENTRONICS firm.
- Such printers are provided with one plastic feeding element fixed on driving bar rotated by a solenoid or by a step motor.
- Such feeding element comprises a cylindrical central portion having several grooves where rubber rings are housed and by two lateral pin wheels cooperating with pads which keep the printing form perforations engaged with the pins.
- The cylindrical central part provides for the feeding of continuous printing form without lateral perforation; to this purpose pressure rolls are also provided which press the printing form against the rubber rings during operation in order to assure the friction required to the paper feeding.
- On the contrary the pin wheels, together with the pads, assure the feeding of the continuous side perforated printing form.
- The described example of paper feeding mechanism can.operate with non perforated printing forms having different width (the maximum ) width is however determined by the distance between the pin wheels) but it has the disadvantage of being unable to handle side perforated printing forms having different sizes, as the distance between the pin wheels cannot be changed.
- To avoid such disadvantages other solutions, which can be found on 5 printers of several manufacturers, as for instance DATAPRODUCTS, involve the use of two separated paper feeding mechanisms. A first mechanism is supplied to assure the friction feeding of non perforated continuous printing forms (which may have different width). It consists in a feeding roll fixed to a first tractor bar and cooperating with pressure rollers. A second mechanism assures the feeding of the continuous side perforated printing form. It consists in two pin wheels cooperating with pads and mounted on a second tractor bar.
- The pin wheels may be axially moved along the second bar and locked in a determined position, thus allowing to operate with printing forms having different width.
- The tractor bars are actuated by the same motor by means of a belt pulley or gear transmission system.
- The embodiment involving the use of two separate feeding mechanisms solves the problem to operate with several sizes both of the side perforated printing form both of the unperforated printing form but makes the printer structure complicate, expensive as well as cumbersome.
- The present invention overcomes such disadvantages and provides a simple and unexpensive paper feeding mechanism which allows to operate . with different sizes of both side perforated printing forms and unperforated printing forms.
- According to a first aspect of the invention, the paper feeding mechanism comprises a pair of feeding elements each one coupled to a pad. Each feeding element and the corresponding pad form a couple which is able to operate with both non perforated printing forms as well as side perforated printing forms. According to another aspect of the invention each couple feeding element-pad may be axially moved along a tractor bar and locked in any desired position: thus it is possible to operate with printing forms of different width, up to a maximum width imposed by the printer structure.
- These and other features will appear more clearly from the following description of a preferred embodiment of the invention which has exemplifying and non restrictive purposes, and from the attached drawings where:
- - fig. 1 is a perspective view of the paper feeding mechanism of the present invention.
- - fig. 2 shows, in exploded perspective view, some elements of the paper feeding mechanism of fig. 1. -- i
- Fig. 1 is a perspective view of a printer having a paper feeding mechanism according to the invention.
- Only the parts required for the understanding of the invention are shown.
- The printer comprises a frame, a printing mechanism and a paper feeding mechanism.
- The frame is formed, for instance, by two
sides plates 1, 2 and abase 3. - The printing mechanism, not shown, may be formed, for instance, by two guiding rods mounted between the sides, on which a printing carriage slideably moves.
- A printing head, for instance of the needle type, is mounted on the printing carriage and allows to obtain the printing of several types by a dot composition, obtained through the energization of several needles and the combined transversal movement of the head and carriage. The printing is performed against a platen 4 on which the printing support moves.
- Platent 4 is fixed to
sides 1, 2. - The feeding mechanism object of the invention comprises a
prismatic driving bar 13, a positioning and guidingrod 14, twocylindrical feeding elements 7, 8, two positioning and guidingarms 9, 10 and twopads - The
driving bar 13 is pivoted onsides 1, 2 by means of bushings and it is rotated by a step motor or by alow inertia motor 15. Positioning and guiding rod 14.is fixed tosides 1, 2 of the frame. Twofeeding elements 7, 8 are mounted ontractor bar 13 and may move along its axis. - Each of such feeding elements, for
instance feeding element 8, is a cylinder, preferably in plastic material, which is provided along a first circumference withpins 8A and along a second circumference with agroove 8B where one or more rubber rings (preferably 2 rings) are housed. - Circunferential portions of the feeding elements which are provided with rings are located internally relative to the circunferential portions provided with pins and considering as reference the direction of
bar 13. - Fig. 2 shows in detailt the exploded perspective view of a positioning and guiding
arm 10 and its relation withfeeding element 8 and thecorresponding pad 12. - The guiding arm is substantially constituted by a body shaped in form of connecting rod and provided with an arm 10A, a
small end 10B,a big end 10C. - The circular opening in the big end receives a
hub 50 integral and coaxial to thecylindrical feeding element 8. -
Hub 50, as well as the cylindrical feeding element, has a prismaticaxial opening 51 where guidingbar 13 is inserted. - Hub 50 is further provided with a
cylindrical groove 52, intended to house an elastic retaining ring 53 ( Benzing, Seeger ring or alike). - Once
hub 50 is engaged with end 10C and locked there by the elastic ring, feedingelement 8 and guidingarm 10 are mutually pivoted so that the relative rotation of the two element according to the ro - tation axis of the tractor bar is permitted,but any relative axial movement is prevented. - The-
small end 10B of the guiding arm is engaged with guidingrod 14 and is free to axially move along this one. - A
locking screw 19, provided with a locking knob; and inserted in a threaded opening of the small end body, allows to lock the guiding arm to the guiding rod in any desired axial position. -
Pad 12 is provided with a pair of drilledtabs corresponding tab 31 of end 10C by means of apin 30. -
Pad 12 is firmly kept in a working position or in an opened position by areturn spring 32, suitably fixed to an eye or pin of the pad, on one side, and to an eye or pin of end 10C, on the other one. - In working position,
pad 12 lays on a peripheral portion offeeding element 8. - An
elongated opening 33 or a groove is provided in the pad zone which, when pad is in working position, gets in contact with the toothed zone of the feeding element, thus avoiding any interference between the pad and the pins. - The
pressure rollers pins rubber rings 36, housed into the groove offeeding element 8. - Their rotation axis is substantially parallel to the rotation axis of the guiding rod.
- when a printing form is inserted in the feeding mechanism the form edges are interposed and pinched between the rubber rings and the pressure rollers.
- The rotation of the feeding elements thus causes the movement of the form.
- The use of two pressure rollers, which operate on different angular positions of the feeding element, determines a contact angle of the printing support with the rubber rings which is wide enough to assure the correct feeding-of the printing support.
- The set of
feeding element 8,pad 12 and positioning and guidingarm 10, forms-a traction group. - The traction group formed by feeding element 7,
pad 11 and positioning and guiding arm 9 is mirror like identical to the first one. - Clearly, through suitable design,the two traction groups may be assembled from identical elements.
- The operation of the feeding mechanism object of the invention is clear: in case a form with side perforations is to be used, the traction groups are axially positioned along the guiding rod and the driving bar in order that the side perforations engage with the pins of the two feeding elements.
- The guiding pads prevent disengagement of the side perforations from the feeding pins.
- The feeding action exerted by the pins is further aided by the feeding action exerted on the form side portions by the rubber rings and due to the pressure exerted by the pressure rollers.
- In case a non perforated form is to be used, the two traction groups are axially positioned in order the form edges do not interfere with the feeding element pins while the feeding action is exerted by the rubber rings.
- It is clear that the described feeding mechanism discloses only a preferred embodiment of the invention and that several changes can be made to the described embodiment without departing from the scope of the invention.
- Particularly the invention may be applied to feeding mechanisms where toothed belts can be used instead of pin wheels.
- Such mechanism are known as tractors and are for instance described in the Italian patent N. 1.037.391.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT19261/81A IT1135127B (en) | 1981-01-22 | 1981-01-22 | PAPER TRANSPORTATION MECHANISM FOR PRINTER |
IT1926181 | 1981-01-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0056955A2 true EP0056955A2 (en) | 1982-08-04 |
EP0056955A3 EP0056955A3 (en) | 1983-09-07 |
EP0056955B1 EP0056955B1 (en) | 1985-05-29 |
Family
ID=11156201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82100237A Expired EP0056955B1 (en) | 1981-01-22 | 1982-01-14 | Paper feeding method in a printer |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0056955B1 (en) |
DE (1) | DE3263801D1 (en) |
IT (1) | IT1135127B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983001227A1 (en) * | 1981-10-09 | 1983-04-14 | Andersson, Leif, Helmer | Paper feed mechanism |
DE3412852A1 (en) * | 1984-04-03 | 1985-10-03 | Mannesmann AG, 4000 Düsseldorf | TRANSPORT DEVICE FOR PRINTERS, ESPECIALLY FOR MATRIX PRINTERS |
GB2163705A (en) * | 1984-08-31 | 1986-03-05 | Alps Electric Co Ltd | Paper feeder for printers |
US4636100A (en) * | 1983-10-14 | 1987-01-13 | Alps Electric Co., Ltd. | Paper feed mechanism for recording apparatus |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1191566A (en) * | 1967-07-12 | 1970-05-13 | Burroughs Corp | Snap-On Web or Paper Sheet Supporting Member for Feed Mechanism. |
DE2421922A1 (en) * | 1973-05-10 | 1974-11-21 | Ibm | PINCH WHEEL TRANSPORT DEVICE |
-
1981
- 1981-01-22 IT IT19261/81A patent/IT1135127B/en active
-
1982
- 1982-01-14 DE DE8282100237T patent/DE3263801D1/en not_active Expired
- 1982-01-14 EP EP82100237A patent/EP0056955B1/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1191566A (en) * | 1967-07-12 | 1970-05-13 | Burroughs Corp | Snap-On Web or Paper Sheet Supporting Member for Feed Mechanism. |
DE2421922A1 (en) * | 1973-05-10 | 1974-11-21 | Ibm | PINCH WHEEL TRANSPORT DEVICE |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983001227A1 (en) * | 1981-10-09 | 1983-04-14 | Andersson, Leif, Helmer | Paper feed mechanism |
US4501510A (en) * | 1981-10-09 | 1985-02-26 | Facit Aktiebolag | Apparatus for feeding sheets of material and continuous webs in printers and typewriters |
US4636100A (en) * | 1983-10-14 | 1987-01-13 | Alps Electric Co., Ltd. | Paper feed mechanism for recording apparatus |
DE3412852A1 (en) * | 1984-04-03 | 1985-10-03 | Mannesmann AG, 4000 Düsseldorf | TRANSPORT DEVICE FOR PRINTERS, ESPECIALLY FOR MATRIX PRINTERS |
DE3412852C2 (en) * | 1984-04-03 | 1986-07-17 | Mannesmann AG, 4000 Düsseldorf | Transport device for printers, in particular for matrix printers |
GB2163705A (en) * | 1984-08-31 | 1986-03-05 | Alps Electric Co Ltd | Paper feeder for printers |
DE3530931A1 (en) * | 1984-08-31 | 1986-03-13 | Alps Electric Co., Ltd., Tokio/Tokyo | PAPER TRANSPORTATION DEVICE FOR PRINTER |
Also Published As
Publication number | Publication date |
---|---|
IT1135127B (en) | 1986-08-20 |
EP0056955A3 (en) | 1983-09-07 |
IT8119261A0 (en) | 1981-01-22 |
DE3263801D1 (en) | 1985-07-04 |
EP0056955B1 (en) | 1985-05-29 |
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