CA1085426A - Paper transport mechanism for transporting single as well as endless forms in a printer unit - Google Patents
Paper transport mechanism for transporting single as well as endless forms in a printer unitInfo
- Publication number
- CA1085426A CA1085426A CA310,146A CA310146A CA1085426A CA 1085426 A CA1085426 A CA 1085426A CA 310146 A CA310146 A CA 310146A CA 1085426 A CA1085426 A CA 1085426A
- Authority
- CA
- Canada
- Prior art keywords
- print roll
- transport mechanism
- driven
- roll
- tractors
- 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
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- 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
- B41J11/24—Detents, brakes, or couplings for feed rollers or platens
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- 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
- B41J11/30—Pin traction elements other than wheels, e.g. pins on endless bands
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- 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
- B41J19/00—Character- or line-spacing mechanisms
- B41J19/76—Line-spacing mechanisms
- B41J19/78—Positive-feed mechanisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
- B65H20/20—Advancing webs by web-penetrating means, e.g. pins
Landscapes
- Handling Of Sheets (AREA)
- Advancing Webs (AREA)
Abstract
PAPER TRANSPORT MECHANISM FOR A PRINTER UNIT
Abstract A transport mechanism for single and endless forms includes a print roll as a support and transport means, and also includes a pin transport means designed as a plug-in unit. The print roll can be driven via a shaft, coup-lings and gears by means of a stepper motor as well as a handwheel. A ratchet wheel carries one coupling part and, by means of the handwheel, can be shifted, latched, and coupled to the other coupling parts on the free-running gear arrangement. In the coupled state, the tractors and the roll are driven via the free-running gear arrangement located on the shaft of the print roll. In an intermediate position, without coupling, only the roll is driven by hand or motor, if there are no tractors. In a further position the ratchet wheel and the print roll are latched, so that only the tractors are driven.
Abstract A transport mechanism for single and endless forms includes a print roll as a support and transport means, and also includes a pin transport means designed as a plug-in unit. The print roll can be driven via a shaft, coup-lings and gears by means of a stepper motor as well as a handwheel. A ratchet wheel carries one coupling part and, by means of the handwheel, can be shifted, latched, and coupled to the other coupling parts on the free-running gear arrangement. In the coupled state, the tractors and the roll are driven via the free-running gear arrangement located on the shaft of the print roll. In an intermediate position, without coupling, only the roll is driven by hand or motor, if there are no tractors. In a further position the ratchet wheel and the print roll are latched, so that only the tractors are driven.
Description
1 The invention concerns a paper transport mechanism for the transport of single as well as endless forms in printers.
With reference to German Gebrauchsmuster 7,333,837 it is known, in desk calculators, to use a print roll for the transport of the paper to be printed.
This print roll is used on the one hand as a support for the print unit and on the other hand as a friction drive. For the transport of paper webs with mar-ginal perforations this desk calculator can be provided with transport means fitted pin rolls. Such a pin roll can be advanced by uniform angular steps with the aid of a step drive comprising a unidirectional stepper unit actuated by a stroke element operated in steps and driving the print roll. These known transport means for forms operate either solely with the print roll as a fric-tion drive or in such a manner that the drive of the print roll simultaneously drives the pin roll. When both parts are simultaneously driven, the inaccur-acies inherent in mechanical drives lead to a pile-up of the paper web between the two transport means, so that a clean print image is not obtainable. Thus, there are so-called inaccurate line spacings. In addition, because of the mech-anical drive, such an arrangement is not suitable to obtain the relatively high paper feed speeds and the flexibility in the lengths of the paper feed necessary in terminal printers.
Therefore, it is the object of the present invention to provide a paper transport mechanism readily adaptable to different tasks, to be of a simple design, to operate safely and reliably, and to be readily operated.
Briefly, the transport mechanism for single and endless forms is provided with a print roll as a support and transport means, and also includes a pin transport means designed as a plug-in unit. The print roll can be driven by means of a stepper motor as well as a handwheel. A ratchet wheel carries one coupling part and, by means of the handwheel, can be shifted, latched, and coupled to the other coupling part on the free-running gear arrangement. In the coupled state, the tractors and the roll are driven via the free-running gear arrangement located on the shaft of the print roll. In an intermediate position, without coupling, only the roll is driven by hand or motor, if there are no tractors. In a further position the ratchet wheel and the print roll are ~ .
s~
1 latched, so that only the tractors are driven The design and operation of the paper transport mechanism in accordance with the invention is described in detail below by means of the example illu-strated in the figures.
The figures show in detail:
Figure 1 is a perspective view of the essential parts of the paper trans-port mechanism designed in accordance with the invention, and Figure 2 is a sectional view taken along plane 2-2 in accordance with Figure 1.
The perspective view of Figure 1 contains the parts which are more or less essential to the function of the invention. Parts used for bearing purposes, for example, have been omitted for clarity's sake and because they are clearly obvious to those skilled in the art. A print roll 1, which is used as a sup-port for a paper web 2 in the print position as well as for feed purposes, is permanently mounted on a shaft 3. The shaft 3 is pivotably mounted in bearings not shown. The paper web 2 can be wound at an angle of more than 90 around the print roll 1 and, if it is an endless form with marginal perforations as in the case of the example shown in Figure 1, is guided by transport means provided with pins and made up of two tractors 4 and 5. These tractors are guided on two shafts 6 and 7 (the square shaft 6 serving as a drive shaft), and are later-ally shiftable on said shafts for adaptation to different widths of paper web 2.
The tractors 4 and 5 essentially consist of one belt each 8 or 9 provided with teeth on the inside and guided around two toothed wheels 11 and 12 and 13 and 14, respectively. The outside of belts 8 and 9 is provided with pins 15 which at a corresponding spacing engage the marginal perforations of the paper web 2, thus advancing the latter when it is driven. The tractors can also be provided with fold-back covers 16, by means of which the paper web is held on the pins 15 and the belts 8 and 9, respectively. On the driving square shaft 6 of the two tractors 4 and 5 a drive gear 17 is arranged which by means of an intermediate gear 18 is driven in direction T, the direction of transport of paper web 2.
The intermediate gear 18 meshes with a toothed wheel 19 of a gear arrangement which is arranged to run freely on the shaft 3 of the print roll 1. The free-1085~26 1 running toothed wheel 19 on shaft 3 can be directly driven by a stepper motor 20 with a drive gear 21 or, as shown in Figure 1, via a further toothed wheel 22 which engages the pinion 21 of the motor 20. During this, the two toothed wheels 19 and 22 are rigidly connected to each other via a sleeve 23. The toothed wheel 22 is provided with a first coupling part 24 comprising slits 25 which are engaged by noses 27 in a second coupling part 26, in order to non-pivotably connect the two coupling parts.
The second coupling part 26 is arranged on a toothed ratchet wheel 28 on the side of the first coupling part 24 of the toothed wheel 22. The ratchet wheel 28 is non pivotably connected to a handwheel 30 via a sleeve 29. The ratchet wheel 28 together with the sleeve 29 and the handwheel 30 is axially shiftable on the shaft 3 of the roll 1. For axial shifting, the sleeve 29 is provided on both sides with a slotted hole 31. On the shaft 3 a pin 32 is arranged past which the sleeve 29 together with the handwheel 30 and the ratchetwheel 28 can be axially shifted on the shaft 3 of the print roll 1, the shift path being limited by the length of the slotted hole 31. In the position shown in Figure 1, in which the ratchet wheel 28 together with the handwheel 30 is on the right-hand side on the extreme end of the shaft 3, the ratchet wheel 28 is non-pivotably latched to a notch 33. During this, the two coupling parts 24 and 26 do not mesh.
Figure 2 shows a lateral sectional view taken along plane 2-2 of Figure 1.
It is shown quite clearly how the paper web 2 is wound at an angle of more than 90 around the print roll 1 and can be fed in the direction of arrow T by the transport means with pins, as, for example, tractor 5. The print roll 1 serves as a support for a print unit 34 which may be designed as a wire pin printer.
During this, the paper in the print position in print unit 34 rests reliably on the print roll 1, so that a clean print image is ensured by the paper guide.
In order to improve the paper guide, paper brakes 35, consisting of leaf springs, are provided which are bent to rest against the print roll 1. Also provided are paper pressure rolls 36 which via arms 37 in the direction of arrow38 can be applied to the print roll 1 or kept lifted off the latter by actuatingmeans not shown in detail. If, for example, the paper is fed by the tractors 4 10~5'~26 1 and 5, the paper pressure rolls 36 are best kept in the lifted off state, as shown in Figure 2, because otherwise the braking effect would become too strong.The transport means consisting of the two tractors 4 and 5 as well as the toothed wheels 17 and 18 and provided with pins are suitably designed as one assembly and can be easily plugged into and arrested in the frame not shown in the figures. The drive coupling, when plugging such transport means provided with pins into the roll drive, is effected via the gear arrangement which in the illustrated example consists of the toothed wheels 19 and 22 connected by a fixed sleeve 23. As previously mentioned, it is also possible to provide a single toothed wheel for this purposes, ratios and space permitting.
The paper transport means designed in accordance with the invention are used for several purposes. Initially a case will be considered where an endlessform web with marginal perforations is to be inserted into the transport means illustrated in the figures. For this purpose the handwheel 30 with the ratchetwheel 28 is shifted by the operator to the left, so that it is unlatched from the notch 33 but not to the extent that the two coupling parts 24 and 26 mesh with each other.
By means of the non-pivotable connection via the slotted hole 31 and the pin 32 the handwheel 30 is non-pivotably connected to the shaft 3. As a result,the print roll 1 is turned upon turning the handwheel 30, without the two trac-tors 4 and 5 being turned via the decoupled gear connection 21, 23, 22 as well as the intermediate gear 18 and the drive gear 17, because the gear connection consisting of the two toothed wheels 19 and 22 is mounted to run freely on shaft3. Thus, in this intermediate position of the ratchet wheel 28 it is possible for the print roll 1, via the handwheel 30, to thread in the paper web, which isintroduced from behind, without simultaneously turning the transport means pro-vided with pins. During this operation, the pressure rolls 36 are best lifted off the print roll 1, so that the paper can be easily threaded in and inserted by hand. After a sufficient quantity of paper has been advanced over the print roll 1 serving as a friction drive, the marginally perforated paper web 2 can beaccurately positioned on the pins 15 with the covers 16 folded back.
To effect the drive via the pin carrying transport means after the paper web 1085~2~6 1 2 has been inserted, the handwheel 30 with the ratchet wheel 28 is axially shifted to the left (cf. Figure 1) to such an extent that the noses 27 of the coupling part 26 engage the slits 25 of the coupling part 24, thus establishing a connection between the toothed wheel 22 and the print roll 1, since the con-nection consisting of the slotted hole 31 and the pin 32 is non-pivotably linkedto the shaft 3 and thus to the print roll 1. Thus, it is possible, via the handwheel 30, to continue turning the print roll 1 and the tractors 4 and 5 jointly. On the other hand, it is possible in this position of the handwheel 30 to jointly drive, via the stepper motor 20 and its drive gear 21 as well as the toothed wheel 22, the sleeve 23? and the toothed wheel 19, the tractors 4 and 5 and, via the connection of the slotted hole 31 and the pin 32, the print roll 1. Thus, in this position both the print roll 1 and the transport means 4 and 5 provided with pins rotate jointly.
For some applications it may be expedient to use the print roll 1 as a paper brake if the marginally perforated paper web 2 is solely advanced by the two tractors 4 and 5. For this purpose the handwheel 30 with the ratchet wheel 28 is positioned as shown in Figure 1, so that, as a result of notch 23 engaginga tooth gap of the ratchet wheel 28, the shaft 3 and the print roll 1 are latched and thus inoperative. Via its drive gear 21 and the free-running gear arrange-ment 19, 22, the intermediate gear 18, the drive gear 17, and the square drive shaft 6, the stepper motor 20 is, however, capable of driving the two tractors 4 and 5.
If the two tractors 4 and 5 are not present in a particular unit, for example, if the print roll 1 is used to print and feed single forms with or without marginal perforations, then drive by means of stepper motor 20 via its drive gear 21 is effected in such a manner that toothed wheel 22 transfers the drive force to the shaft 3 of the print roll 1 via the coupled coupling parts 24 and 26, with the handwheel 30 being in the left-most position in accordance with Figure 1, or in an intermediate position via the slotted hole 31 and the .
pin 32. In this case the paper pressure rolls 36 preferably rest against the print roll 1, so that the latter serves as a friction drive on the one hand and as a support for the print unit 34 on the other.
1~8S~,6 1 The transport means with pins shown in the figures consist of two tractors 4 and 5. These tractors may be replaced by so-called pin roll transport means comprising on their edges two pin rolls of a relatively great diameter for guid-ing marginally perforated paper webs. It is also possible to replace the gear arrangement consisting of the two toothed wheels 19 and 22 by a single toothed wheel running freely on shaft 3 and meshing with the drive pinion 21 of the stepper motor 20 by which it is driven. The stepper motor 20 is used in a known manner to feed the paper web stepwise, as required during printing.
The paper transport mechanism designed in accordance with the invention can be used in different ways in data and information recording systems, as previously described. Because of their flexibility, for example, with regard to endless webs with marginal perforations or single forms, whereby feeding is effected by means of the print roll serving solely as a friction drive, the described trans-port means are particularly suitable for so-called terminal printers. Thus, the paper transport mechanism in accordance with the invention in very flexible with regard to its applications, easy and convenient to handle for the operator, and of a simple and practical design.
With reference to German Gebrauchsmuster 7,333,837 it is known, in desk calculators, to use a print roll for the transport of the paper to be printed.
This print roll is used on the one hand as a support for the print unit and on the other hand as a friction drive. For the transport of paper webs with mar-ginal perforations this desk calculator can be provided with transport means fitted pin rolls. Such a pin roll can be advanced by uniform angular steps with the aid of a step drive comprising a unidirectional stepper unit actuated by a stroke element operated in steps and driving the print roll. These known transport means for forms operate either solely with the print roll as a fric-tion drive or in such a manner that the drive of the print roll simultaneously drives the pin roll. When both parts are simultaneously driven, the inaccur-acies inherent in mechanical drives lead to a pile-up of the paper web between the two transport means, so that a clean print image is not obtainable. Thus, there are so-called inaccurate line spacings. In addition, because of the mech-anical drive, such an arrangement is not suitable to obtain the relatively high paper feed speeds and the flexibility in the lengths of the paper feed necessary in terminal printers.
Therefore, it is the object of the present invention to provide a paper transport mechanism readily adaptable to different tasks, to be of a simple design, to operate safely and reliably, and to be readily operated.
Briefly, the transport mechanism for single and endless forms is provided with a print roll as a support and transport means, and also includes a pin transport means designed as a plug-in unit. The print roll can be driven by means of a stepper motor as well as a handwheel. A ratchet wheel carries one coupling part and, by means of the handwheel, can be shifted, latched, and coupled to the other coupling part on the free-running gear arrangement. In the coupled state, the tractors and the roll are driven via the free-running gear arrangement located on the shaft of the print roll. In an intermediate position, without coupling, only the roll is driven by hand or motor, if there are no tractors. In a further position the ratchet wheel and the print roll are ~ .
s~
1 latched, so that only the tractors are driven The design and operation of the paper transport mechanism in accordance with the invention is described in detail below by means of the example illu-strated in the figures.
The figures show in detail:
Figure 1 is a perspective view of the essential parts of the paper trans-port mechanism designed in accordance with the invention, and Figure 2 is a sectional view taken along plane 2-2 in accordance with Figure 1.
The perspective view of Figure 1 contains the parts which are more or less essential to the function of the invention. Parts used for bearing purposes, for example, have been omitted for clarity's sake and because they are clearly obvious to those skilled in the art. A print roll 1, which is used as a sup-port for a paper web 2 in the print position as well as for feed purposes, is permanently mounted on a shaft 3. The shaft 3 is pivotably mounted in bearings not shown. The paper web 2 can be wound at an angle of more than 90 around the print roll 1 and, if it is an endless form with marginal perforations as in the case of the example shown in Figure 1, is guided by transport means provided with pins and made up of two tractors 4 and 5. These tractors are guided on two shafts 6 and 7 (the square shaft 6 serving as a drive shaft), and are later-ally shiftable on said shafts for adaptation to different widths of paper web 2.
The tractors 4 and 5 essentially consist of one belt each 8 or 9 provided with teeth on the inside and guided around two toothed wheels 11 and 12 and 13 and 14, respectively. The outside of belts 8 and 9 is provided with pins 15 which at a corresponding spacing engage the marginal perforations of the paper web 2, thus advancing the latter when it is driven. The tractors can also be provided with fold-back covers 16, by means of which the paper web is held on the pins 15 and the belts 8 and 9, respectively. On the driving square shaft 6 of the two tractors 4 and 5 a drive gear 17 is arranged which by means of an intermediate gear 18 is driven in direction T, the direction of transport of paper web 2.
The intermediate gear 18 meshes with a toothed wheel 19 of a gear arrangement which is arranged to run freely on the shaft 3 of the print roll 1. The free-1085~26 1 running toothed wheel 19 on shaft 3 can be directly driven by a stepper motor 20 with a drive gear 21 or, as shown in Figure 1, via a further toothed wheel 22 which engages the pinion 21 of the motor 20. During this, the two toothed wheels 19 and 22 are rigidly connected to each other via a sleeve 23. The toothed wheel 22 is provided with a first coupling part 24 comprising slits 25 which are engaged by noses 27 in a second coupling part 26, in order to non-pivotably connect the two coupling parts.
The second coupling part 26 is arranged on a toothed ratchet wheel 28 on the side of the first coupling part 24 of the toothed wheel 22. The ratchet wheel 28 is non pivotably connected to a handwheel 30 via a sleeve 29. The ratchet wheel 28 together with the sleeve 29 and the handwheel 30 is axially shiftable on the shaft 3 of the roll 1. For axial shifting, the sleeve 29 is provided on both sides with a slotted hole 31. On the shaft 3 a pin 32 is arranged past which the sleeve 29 together with the handwheel 30 and the ratchetwheel 28 can be axially shifted on the shaft 3 of the print roll 1, the shift path being limited by the length of the slotted hole 31. In the position shown in Figure 1, in which the ratchet wheel 28 together with the handwheel 30 is on the right-hand side on the extreme end of the shaft 3, the ratchet wheel 28 is non-pivotably latched to a notch 33. During this, the two coupling parts 24 and 26 do not mesh.
Figure 2 shows a lateral sectional view taken along plane 2-2 of Figure 1.
It is shown quite clearly how the paper web 2 is wound at an angle of more than 90 around the print roll 1 and can be fed in the direction of arrow T by the transport means with pins, as, for example, tractor 5. The print roll 1 serves as a support for a print unit 34 which may be designed as a wire pin printer.
During this, the paper in the print position in print unit 34 rests reliably on the print roll 1, so that a clean print image is ensured by the paper guide.
In order to improve the paper guide, paper brakes 35, consisting of leaf springs, are provided which are bent to rest against the print roll 1. Also provided are paper pressure rolls 36 which via arms 37 in the direction of arrow38 can be applied to the print roll 1 or kept lifted off the latter by actuatingmeans not shown in detail. If, for example, the paper is fed by the tractors 4 10~5'~26 1 and 5, the paper pressure rolls 36 are best kept in the lifted off state, as shown in Figure 2, because otherwise the braking effect would become too strong.The transport means consisting of the two tractors 4 and 5 as well as the toothed wheels 17 and 18 and provided with pins are suitably designed as one assembly and can be easily plugged into and arrested in the frame not shown in the figures. The drive coupling, when plugging such transport means provided with pins into the roll drive, is effected via the gear arrangement which in the illustrated example consists of the toothed wheels 19 and 22 connected by a fixed sleeve 23. As previously mentioned, it is also possible to provide a single toothed wheel for this purposes, ratios and space permitting.
The paper transport means designed in accordance with the invention are used for several purposes. Initially a case will be considered where an endlessform web with marginal perforations is to be inserted into the transport means illustrated in the figures. For this purpose the handwheel 30 with the ratchetwheel 28 is shifted by the operator to the left, so that it is unlatched from the notch 33 but not to the extent that the two coupling parts 24 and 26 mesh with each other.
By means of the non-pivotable connection via the slotted hole 31 and the pin 32 the handwheel 30 is non-pivotably connected to the shaft 3. As a result,the print roll 1 is turned upon turning the handwheel 30, without the two trac-tors 4 and 5 being turned via the decoupled gear connection 21, 23, 22 as well as the intermediate gear 18 and the drive gear 17, because the gear connection consisting of the two toothed wheels 19 and 22 is mounted to run freely on shaft3. Thus, in this intermediate position of the ratchet wheel 28 it is possible for the print roll 1, via the handwheel 30, to thread in the paper web, which isintroduced from behind, without simultaneously turning the transport means pro-vided with pins. During this operation, the pressure rolls 36 are best lifted off the print roll 1, so that the paper can be easily threaded in and inserted by hand. After a sufficient quantity of paper has been advanced over the print roll 1 serving as a friction drive, the marginally perforated paper web 2 can beaccurately positioned on the pins 15 with the covers 16 folded back.
To effect the drive via the pin carrying transport means after the paper web 1085~2~6 1 2 has been inserted, the handwheel 30 with the ratchet wheel 28 is axially shifted to the left (cf. Figure 1) to such an extent that the noses 27 of the coupling part 26 engage the slits 25 of the coupling part 24, thus establishing a connection between the toothed wheel 22 and the print roll 1, since the con-nection consisting of the slotted hole 31 and the pin 32 is non-pivotably linkedto the shaft 3 and thus to the print roll 1. Thus, it is possible, via the handwheel 30, to continue turning the print roll 1 and the tractors 4 and 5 jointly. On the other hand, it is possible in this position of the handwheel 30 to jointly drive, via the stepper motor 20 and its drive gear 21 as well as the toothed wheel 22, the sleeve 23? and the toothed wheel 19, the tractors 4 and 5 and, via the connection of the slotted hole 31 and the pin 32, the print roll 1. Thus, in this position both the print roll 1 and the transport means 4 and 5 provided with pins rotate jointly.
For some applications it may be expedient to use the print roll 1 as a paper brake if the marginally perforated paper web 2 is solely advanced by the two tractors 4 and 5. For this purpose the handwheel 30 with the ratchet wheel 28 is positioned as shown in Figure 1, so that, as a result of notch 23 engaginga tooth gap of the ratchet wheel 28, the shaft 3 and the print roll 1 are latched and thus inoperative. Via its drive gear 21 and the free-running gear arrange-ment 19, 22, the intermediate gear 18, the drive gear 17, and the square drive shaft 6, the stepper motor 20 is, however, capable of driving the two tractors 4 and 5.
If the two tractors 4 and 5 are not present in a particular unit, for example, if the print roll 1 is used to print and feed single forms with or without marginal perforations, then drive by means of stepper motor 20 via its drive gear 21 is effected in such a manner that toothed wheel 22 transfers the drive force to the shaft 3 of the print roll 1 via the coupled coupling parts 24 and 26, with the handwheel 30 being in the left-most position in accordance with Figure 1, or in an intermediate position via the slotted hole 31 and the .
pin 32. In this case the paper pressure rolls 36 preferably rest against the print roll 1, so that the latter serves as a friction drive on the one hand and as a support for the print unit 34 on the other.
1~8S~,6 1 The transport means with pins shown in the figures consist of two tractors 4 and 5. These tractors may be replaced by so-called pin roll transport means comprising on their edges two pin rolls of a relatively great diameter for guid-ing marginally perforated paper webs. It is also possible to replace the gear arrangement consisting of the two toothed wheels 19 and 22 by a single toothed wheel running freely on shaft 3 and meshing with the drive pinion 21 of the stepper motor 20 by which it is driven. The stepper motor 20 is used in a known manner to feed the paper web stepwise, as required during printing.
The paper transport mechanism designed in accordance with the invention can be used in different ways in data and information recording systems, as previously described. Because of their flexibility, for example, with regard to endless webs with marginal perforations or single forms, whereby feeding is effected by means of the print roll serving solely as a friction drive, the described trans-port means are particularly suitable for so-called terminal printers. Thus, the paper transport mechanism in accordance with the invention in very flexible with regard to its applications, easy and convenient to handle for the operator, and of a simple and practical design.
Claims (3)
1. A transport mechanism for sheet or web material, comprising:
(a) a print roll connected to a drive shaft for rotation therewith;
(b) a web transport having web driving means connected thereto;
(c) driven means mounted on said drive shaft and rotatable rel-ative thereto, said driven means being in driving relationship with said web driving means;
(d) manually operable means for selectively rotating said drive shaft and slidably but non-rotatably mounted thereon, said manually operable means having a first locked position precluding rotation of said drive shaft, and a second, free position in which said manually operable means is drivingly coupled to said driven means mounted on said drive shaft, and (e) motor means operatively connected to said driven means.
(a) a print roll connected to a drive shaft for rotation therewith;
(b) a web transport having web driving means connected thereto;
(c) driven means mounted on said drive shaft and rotatable rel-ative thereto, said driven means being in driving relationship with said web driving means;
(d) manually operable means for selectively rotating said drive shaft and slidably but non-rotatably mounted thereon, said manually operable means having a first locked position precluding rotation of said drive shaft, and a second, free position in which said manually operable means is drivingly coupled to said driven means mounted on said drive shaft, and (e) motor means operatively connected to said driven means.
2. A transport mechanism as defined in claim 1 wherein said manually operable means includes a ratchet wheel connected thereto, and stop means engageable with said ratchet wheel when said manually oper-able means is in said locked position.
3. A transport mechanism as defined in claims 1 or 2 wherein said manually operable means is locatable in a third position, intermediate said first and second positions, wherein said print roll can be manually rotated regardless of the driving or non-driving of the web transport by said motor means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2758148A DE2758148C2 (en) | 1977-12-27 | 1977-12-27 | Paper transport device for the transport of single or continuous forms in a writing device |
| DEP2758148.2 | 1977-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1085426A true CA1085426A (en) | 1980-09-09 |
Family
ID=6027374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA310,146A Expired CA1085426A (en) | 1977-12-27 | 1978-08-28 | Paper transport mechanism for transporting single as well as endless forms in a printer unit |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0002796B1 (en) |
| JP (1) | JPS5492815A (en) |
| CA (1) | CA1085426A (en) |
| DE (2) | DE2758148C2 (en) |
| IT (1) | IT1202808B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4564305A (en) * | 1982-04-20 | 1986-01-14 | Siemens Aktiengesellschaft | Transport device for margin-perforated fanfold paper and for continuous roll paper |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH022604Y2 (en) * | 1981-01-21 | 1990-01-22 | ||
| JPS5833486A (en) * | 1981-04-09 | 1983-02-26 | セントロニクス・デ−タ・コンピユ−タ−・コ−ポレ−シヨン | Paper feeding system for printer |
| JPS5829446U (en) * | 1981-08-20 | 1983-02-25 | セイコーエプソン株式会社 | printer paper feeder |
| DE3230190C2 (en) * | 1982-08-13 | 1984-12-06 | Siemens AG, 1000 Berlin und 8000 München | Paper feeding device for printer equipment |
| DE3232875A1 (en) * | 1982-09-02 | 1984-03-08 | Mannesmann AG, 4000 Düsseldorf | Paper transporting device for printers, in particular dot matrix printers |
| GB2139149B (en) * | 1983-03-04 | 1986-06-25 | Canon Kk | Sheet advancing device |
| SE446839B (en) * | 1984-03-01 | 1986-10-13 | Philips Norden Ab | DEVICE FOR SUPPLY OF QUITTO AND / OR JOURNAL TAPE |
| DE3621512A1 (en) * | 1986-06-25 | 1988-01-07 | Siemens Ag | METHOD FOR PRODUCING A PAPER TRANSPORT ROLLER AND THE USE THEREOF IN A PRINTING DEVICE |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1561310A1 (en) * | 1967-03-10 | 1970-04-02 | Sis S A | Device on typewriters |
| US3753483A (en) * | 1970-03-20 | 1973-08-21 | Memorex Corp | Typewriter dual feed apparatus |
| GB1369518A (en) * | 1972-03-14 | 1974-10-09 | Int Computers Ltd | Web feeding apparatus |
| US3880016A (en) * | 1974-03-07 | 1975-04-29 | Qume Corp | Variable displacement apparatus for platen and tractor feed |
| IT1022388B (en) * | 1974-09-27 | 1978-03-20 | Honeywell Inf Systems | PAPER TRANSPORT MECHANISM FOR MULTIPLE COPY PRINTERS |
-
1977
- 1977-12-27 DE DE2758148A patent/DE2758148C2/en not_active Expired
-
1978
- 1978-08-28 CA CA310,146A patent/CA1085426A/en not_active Expired
- 1978-11-22 JP JP14346178A patent/JPS5492815A/en active Pending
- 1978-12-12 IT IT30727/78A patent/IT1202808B/en active
- 1978-12-20 EP EP78101786A patent/EP0002796B1/en not_active Expired
- 1978-12-20 DE DE7878101786T patent/DE2861046D1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4564305A (en) * | 1982-04-20 | 1986-01-14 | Siemens Aktiengesellschaft | Transport device for margin-perforated fanfold paper and for continuous roll paper |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2758148C2 (en) | 1980-01-10 |
| JPS5492815A (en) | 1979-07-23 |
| EP0002796A1 (en) | 1979-07-11 |
| DE2758148B1 (en) | 1979-05-10 |
| EP0002796B1 (en) | 1981-09-02 |
| DE2861046D1 (en) | 1981-11-26 |
| IT7830727A0 (en) | 1978-12-12 |
| IT1202808B (en) | 1989-02-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |