EP0006483B1 - Apparatus for affixing sheets with varying lengths to a rotating drum - Google Patents

Apparatus for affixing sheets with varying lengths to a rotating drum Download PDF

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Publication number
EP0006483B1
EP0006483B1 EP79101720A EP79101720A EP0006483B1 EP 0006483 B1 EP0006483 B1 EP 0006483B1 EP 79101720 A EP79101720 A EP 79101720A EP 79101720 A EP79101720 A EP 79101720A EP 0006483 B1 EP0006483 B1 EP 0006483B1
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EP
European Patent Office
Prior art keywords
drum
sheet
clamping
actuating
active position
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
Application number
EP79101720A
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German (de)
French (fr)
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EP0006483A1 (en
Inventor
Donald Lee Jackson
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International Business Machines Corp
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International Business Machines Corp
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Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0006483A1 publication Critical patent/EP0006483A1/en
Application granted granted Critical
Publication of EP0006483B1 publication Critical patent/EP0006483B1/en
Expired legal-status Critical Current

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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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/22—Clamps or grippers
    • B41J13/223—Clamps or grippers on rotatable drums

Definitions

  • the present invention relates to a device for fixing the front and rear edges of a sheet of paper and more particularly, a device for fixing the front and rear edges of sheets of paper of variable length.
  • Another method of holding a sheet of paper against the surface of a drum or roller is to provide fasteners or other fasteners on the exterior surface of the drum to secure the sheet to the drum and allow it to rotate with this one.
  • the clips hold the sheet of paper in a fixed position against the surface of the cylinder and eliminate any risk of it sliding on the surface of the cylinder.
  • fasteners are more effective than a retaining rod in certain printing techniques, for example in inkjet printing, their use has a drawback.
  • Sheets of paper of variable length cannot be immobilized by the fasteners which are arranged at a certain distance from each other equal to the length of the sheets to be printed. Any change in the length of the paper sheets will shutdown the printing system to adjust the position of the clips to the length of the new paper sheets. This process can cause extremely significant loss of time when the sheets of paper are not of constant length during a printing operation.
  • the object of the present invention is to overcome this drawback and to provide efficient means for fixing the sheets on a printer drum which require neither stopping the printing system, nor manual intervention, in order to adapt the position of the means. fixing to the length of the sheets.
  • the drum is of the type comprising front edge fasteners and rear edge fasteners of the sheets.
  • the front edge fasteners are carried by a support integral with the drum and are actuated either manually or automatically when the front edge of the sheet has been brought against them.
  • the rear edge fasteners are normally spaced from the drum and are not integral in rotation with the latter.
  • a detector on the rear edge of the sheets controls on the one hand the active positioning of the fasteners and on the other hand their fastening in rotation with the drum thanks to a clutch system which couples the axis of the drum with a flange supporting the rear edge fasteners.
  • the sheets are thus effectively fixed on the drum regardless of their length and the order in which they succeed one another. It is nevertheless preferable that the maximum length of the sheets is less than the circumference of the drum.
  • Figure 1 is a perspective view of a printing drum assembly comprising the fixing system of the present invention.
  • Figure 2 is a partial perspective view taken from the right end of the print drum assembly of Figure 1, the drum being shown paperless.
  • Figure 3 is a sectional view of the printing drum assembly of Figure 2 taken along lines 3-3.
  • a paper tray 10 carries and guides a sheet of paper 12 on the printing drum 14.
  • the drum 14 is rotated on an axis 16 which carries other devices which will be commented on later.
  • fasteners for the front edge of the sheets of paper 18 are arranged along the length of the drum 14 to fix the front edge of the sheet of paper 12.
  • the fasteners 18 are closed simultaneously by a actuating lever with central articulation 20 which can be actuated manually or automatically.
  • the fasteners 18 and the actuation lever 20 both rotate with the drum 14 on the axis 16.
  • the outer surface of the drum 14 has grooves 22 which act as guide zones for the fingers 24 introduced into these grooves when a sheet is removed from the printing system.
  • the removal of the sheet of paper 12 from the surface of the printing drum 14 will be dealt with during the description of the operation of the device.
  • each flange 26 On each side of the printing drum 14, there are flanges 26.
  • the flanges 26 are mounted so as to rotate independently of the shaft 16 which passes through the drum 14 in its longitudinal direction.
  • a guide path 28 is provided on each of the flanges 26 for guiding a curved actuating arm 30.
  • a solenoid 31 with plunger core shown diagrammatically in FIG. 3 moves the actuating arm 30 in rotation by means of connecting rods. connection and pinions (not shown), in or out of guide path 28.
  • each flange 26 carries a clutch 32 with toothed sector 34 which is pivotally mounted on an axis 33 carried by the flange.
  • a control lever 35 integral with the clutch 32 allows the latter to pivot, when the arm 30 is engaged in the guide path 28 and comes to stress the end of the lever 35.
  • Toothed wheels 36 are fixedly mounted on the axis 16 on each side of the printing drum 14 and are integral in rotation with the latter.
  • a return spring 39 (FIG. 2) keeps the toothed sector 34 of the clutch 32 in contact with the teeth 38 of the toothed wheel. 36 and consequently to secure in rotation the wheel 36 and the flange 26.
  • the clutch 32 is released from the wheel 36 and the flange 26 is blocked in rotation in a determined position.
  • a stud 40 is provided on each flange 26 in the immediate vicinity of the guide path 28 to carry a central pinion 42 and a movable plate 44.
  • the central pinion 42 is fixedly mounted on the stud 40 and the movable plate 44 is rotatably mounted on this same stud.
  • the movable plate 44 can pivot around the stud 40 under the action of the solenoid 31 indicated above thanks to the cooperation of a pin 46 carried by the plate 44 with a finger 47 carried by the arm 30.
  • a satellite pinion 48 is mounted in rotation on an axis carried by the movable plate 44 in a position adjacent to the central pinion 42 so that the teeth of the pinion 48 mesh with the teeth of the pinion 42.
  • the axis of the satellite pinion 48 describes an arc of a circle around the axis of the central pinion 42 when the movable plate 44 pivots around the axis of the pin 40, while the pinion 48 itself rotates around its own axis.
  • the shaft on which the pinions 48 are mounted also carries the fastener 50 from the rear edge of the sheet of paper. Consequently, when the pinions 48 are rotated, the rear edge fastener of sheets of paper 50 follows their rotational paths.
  • the fastener 50 is always returned to the surface of the drum 14 by springs 52 fixed to studs 54 mounted on the flange 26.
  • the print drum 14 When the machine is initially placed in paper loading mode, the print drum 14 slowly rotates counterclockwise, as seen in Figure 1.
  • the sheet of paper 12 is advanced on the paper tray 10 under the trailing edge fastener of paper sheet 50 and in the trailing edge fasteners of sheet of paper 18.
  • the printing drum 14 continues to rotate counterclockwise and the sheet of paper 12 rotates with it.
  • the front edge fasteners of sheets of paper 18 can either be closed manually, by tilting the actuation lever 20 towards the surface of the drum 14 or mechanically, by the use of a cam-cam follower arrangement. .
  • the guide surface acting as a cam could be mounted on the surface of the flange 26, in a position adjacent to the drum 14.
  • the cam follower would be connected to the actuation lever 20 and provided so as to follow the guide surface of the cam when the latter is driven in movement by the flange 26 in order to ensure the opening and closing of the front edge fasteners of sheets 18.
  • the fasteners 18 are not controlled by detectors, their rest position is detected by a detector which will be described later.
  • the actuating arm 30, as seen in FIG. 2 is engaged in the guide path 28 and the teeth 34 of the toothed sector clutch 32 do not mesh with the teeth 38 of the wheel 36.
  • the sheet rear edge attachment 50 is open and released from the surface of the drum 14.
  • An optical detector 41 of the rear edge of the sheet shown in FIG. 3 detects the passage of the rear edge of the sheet, through the opening 43 formed in the paper tray 10, and actuates a chronology unit 45 which sends a signal to the drum drive control logic (not shown) to drive the drum 14 for a specified period of time and distance to allow the entire length of the sheet 12 to be pulled over the surface of the drum 14.
  • the chronology unit 45 also de-energizes the solenoid 31 to allow the curved actuating arm 30 to leave the guide path 28 and control the mechanical operations which will be described below.
  • the detectors used in the present invention could be pneumatic material, mechanical, electrical or a combination of these various types.
  • a mechanical clutch operation takes place simultaneously with the mechanical movements described above.
  • the lever 35 of the toothed sector clutch 32 is released from the curved actuating arm 30 and the toothed sector is pulled towards the wheel 36 by the spring 39 in order to cause the gearing of the teeth. 34 and 38.
  • the flange 26 can now be rotated with the wheel 36 and the drum 14.
  • the drum control logic described above locates the position of the drum where the rear edge fastener 50 has grasped the rear edge of the sheet of paper 12.
  • a reverse sequence of the steps described previously is initiated.
  • the solenoid 31 is excited via the chronology unit 45 and the curved actuating arm 30 enters the guide path 28 to separate the flange 26 and the toothed sector clutch 32 from the wheel 36, this which isolates the flange 26 from the rotary movement of the drum 14.
  • the solenoid excited at the same time as the curved arm 30, causes the introduction of the guide fingers 24 into the grooves 22 of the drum 14.
  • the solenoid also causes the rotation in the direction schedule of the movable plate 44 and causes the movement of the pinion gear 48 around the central pinion 42 and causes the attachment of the rear edge of the sheet 50 at the same time.
  • the clockwise movement of the movable plate 44 causes the sheet rear edge fastener 50 to separate from the drum 14.
  • the drum 14 is rotated clockwise and the sheet of paper it carries follows the guide fingers 24 and is directed upwards on the paper tray 10.
  • the detector described above and ensuring the detection of the initial tightening point of the front edge fasteners 18 during the loading operation again detects this position.
  • the movement of the drum is stopped and the sheet front edge fasteners 18 are open.
  • the sheet of paper 12 can now be manually removed from the surface of the drum 14 and the paper tray 10.

Description

La présente invention concerne un dispositif de fixation des bords avant et arrière d'une feuille de papier et plus particulièrement, un dispositif de fixation des bords avant et arrière de feuilles de papier de longueur variable.The present invention relates to a device for fixing the front and rear edges of a sheet of paper and more particularly, a device for fixing the front and rear edges of sheets of paper of variable length.

Dans certaines techniques d'impression, par exemple l'impression par jet d'encre, il est hautement souhaitable de maintenir la feuille de papier à imprimer dans une position aussi fixe que possible pour permettre une localisation et une définition précises de l'impression. La tige classique maintenant une feuille de papier contre la platine d'une imprimante est inappropriée en ce qui concerne son utilisation dans une machine d'impression à jet d'encre en raison des possibilités de glissement du papier, bien que ce risque soit peu élevé, entre la tige et la platine qui est entraînée en rotation. Les risques de glissement du papier apparaissent chaque fois que la platine est entraînée en rotation dans un sens ou dans l'autre.In certain printing techniques, for example inkjet printing, it is highly desirable to keep the sheet of paper to be printed in as fixed a position as possible to allow precise location and definition of the print. The conventional rod holding a sheet of paper against the platen of a printer is unsuitable for use in an inkjet printing machine because of the possibilities of sliding of the paper, although this risk is low. , between the rod and the plate which is rotated. The risks of paper slipping appear each time the platen is rotated in one direction or the other.

Lorsque l'impression d'un tableau, d'une représentation graphique ou d'autres caractères et chiffres sur une feuille de papier implique des rotations successives de la platine, du tambour ou du rouleau dans un sens et dans l'autre, tout glissement du papier sur la platine, le tambour ou le rouleau, affectera la définition de l'impression sur le papier. En conséquence, la combinaison tige-platine est inappropriée en ce qui concerne son utilisation dans la plupart des applications relevant de la technologie d'impression et impliquant des rotations successives de la platine, du tambour ou du rouleau.When the printing of a table, a graphic representation or other characters and figures on a sheet of paper involves successive rotations of the stage, the drum or the roller in one direction and in the other, any sliding paper on the platen, drum, or roller will affect the definition of printing on the paper. Consequently, the rod-platen combination is inappropriate with regard to its use in most applications relating to printing technology and involving successive rotations of the platen, the drum or the roller.

Un autre procédé de maintien d'une feuille de papier contre la surface d'un tambour ou d'un rouleau consiste à prévoir des attaches ou autres éléments de fixation sur la surface extérieure du tambour pour fixer la feuille au tambour et permettre sa rotation avec celui-ci. Les attaches maintiennent la feuille de papier en position fixe contre la surface du cylindre et éliminent tout risque de glissement de celle-ci sur la surface du cylindre.Another method of holding a sheet of paper against the surface of a drum or roller is to provide fasteners or other fasteners on the exterior surface of the drum to secure the sheet to the drum and allow it to rotate with this one. The clips hold the sheet of paper in a fixed position against the surface of the cylinder and eliminate any risk of it sliding on the surface of the cylinder.

Bien que les attaches soient plus efficaces qu'une tige de maintien dans certaines techniques d'impression, par exemple en impression par jet d'encre, leur utilisation présente un inconvénient. Les feuilles de papier de longuer variable ne peuvent pas être immobilisées par les attaches qui sont disposées à une certaine distance les unes des autres égale à la longueur des feuilles à imprimer. Toute modification de la longueur des feuilles de papier entraîne un arrêt du système d'impression pour ajuster la position des attaches à la longueur des nouvelles feuilles de papier. Ce procédé peut entraîner des pertes de temps extrêmement importantes lorsque les feuilles de papier ne sont pas de longueur constante pendant une opération d'impression.Although the fasteners are more effective than a retaining rod in certain printing techniques, for example in inkjet printing, their use has a drawback. Sheets of paper of variable length cannot be immobilized by the fasteners which are arranged at a certain distance from each other equal to the length of the sheets to be printed. Any change in the length of the paper sheets will shutdown the printing system to adjust the position of the clips to the length of the new paper sheets. This process can cause extremely significant loss of time when the sheets of paper are not of constant length during a printing operation.

La présente invention a pour but de pallier cet inconvénient et de fournir des moyens efficaces de fixation des feuilles sur un tambour d'imprimante qui ne nécessitent ni l'arrêt du système d'impression, ni une intervention manuelle, pour adapter la position des moyens de fixation à la longueur des feuilles.The object of the present invention is to overcome this drawback and to provide efficient means for fixing the sheets on a printer drum which require neither stopping the printing system, nor manual intervention, in order to adapt the position of the means. fixing to the length of the sheets.

Conformément à l'invention, le tambour est du type comportant des attaches de bord avant et des attaches de bord arrière des feuilles. Les attaches de bord avant sont portées par un support solidaire du tambour et sont actionnées soit manuellement soit automatiquement lorsque le bord avant de la feuille a été amené contre elles. Les attaches de bord arrière sont normalement écartées du tambour et ne sont pas solidaires en rotation de ce dernier. Un détecteur du bord arrière des feuilles commande d'une part la mise en position active des attaches et d'autre part leur solidarisation en rotation avec le tambour grâce à un système d'embrayage qui accouple l'axe du tambour avec un flasque supportant les attaches de bord arrière.According to the invention, the drum is of the type comprising front edge fasteners and rear edge fasteners of the sheets. The front edge fasteners are carried by a support integral with the drum and are actuated either manually or automatically when the front edge of the sheet has been brought against them. The rear edge fasteners are normally spaced from the drum and are not integral in rotation with the latter. A detector on the rear edge of the sheets controls on the one hand the active positioning of the fasteners and on the other hand their fastening in rotation with the drum thanks to a clutch system which couples the axis of the drum with a flange supporting the rear edge fasteners.

Les feuilles sont ainsi efficacement fixées sur le tambour indépendamment de leur longueur et de l'ordre dans lequel elles se succèdent. Il est néanmoins préférable que la longueur maximale des feuilles soit inférieure à la circonférence du tambour.The sheets are thus effectively fixed on the drum regardless of their length and the order in which they succeed one another. It is nevertheless preferable that the maximum length of the sheets is less than the circumference of the drum.

D'autres objets, caractéristiques et avantages de la présente invention ressortiront mieux de l'exposé qui suit, fait en référence aux dessins annexés à ce texte, qui représentent un mode de réalisation préféré de celle-ci.Other objects, characteristics and advantages of the present invention will emerge more clearly from the following description, made with reference to the drawings appended to this text, which represent a preferred embodiment thereof.

La figure 1 est une vue en perspective d'un ensemble à tambour d'impression comprenant le système de fixation de la présente invention.Figure 1 is a perspective view of a printing drum assembly comprising the fixing system of the present invention.

La figure 2 est une vue en perspective partielle prise de l'extrémité droite de l'ensemble à tambour d'impression de la figure 1, le tambour étant représenté sans papier.Figure 2 is a partial perspective view taken from the right end of the print drum assembly of Figure 1, the drum being shown paperless.

La figure 3 est une vue en coupe de l'ensemble à tambour d'impression de la figure 2 prise selon les lignes 3-3.Figure 3 is a sectional view of the printing drum assembly of Figure 2 taken along lines 3-3.

En se reportant aux figures 1 et 2, on voit qu'un plateau porte-papier 10 porte et guide une feuille de papier 12 sur le tambour d'impression 14. Le tambour 14 est entraîné en rotation sur un axe 16 qui porte d'autres dispositifs qui seront commentés ultérieurement.Referring to Figures 1 and 2, we see that a paper tray 10 carries and guides a sheet of paper 12 on the printing drum 14. The drum 14 is rotated on an axis 16 which carries other devices which will be commented on later.

A la périphérie du tambour d'impression 14, des éléments de fixation du bord avant de feuilles de papier 18 sont disposés sur la longueur du tambour 14 pour fixer le bord avant de la feuille de papier 12. Les attaches 18 sont fermées simultanément par un levier d'actionnement à articulation centrale 20 qui peut être actionné manuellement ou automatiquement. Les attaches 18 et le levier d'actionnement 20 tournent tous deux avec le tambour 14 sur l'axe 16.At the periphery of the printing drum 14, fasteners for the front edge of the sheets of paper 18 are arranged along the length of the drum 14 to fix the front edge of the sheet of paper 12. The fasteners 18 are closed simultaneously by a actuating lever with central articulation 20 which can be actuated manually or automatically. The fasteners 18 and the actuation lever 20 both rotate with the drum 14 on the axis 16.

La surface extérieure du tambour 14 comporte des gorges 22 faisant fonction de zones de guidage pour les doigts 24 introduits dans ces gorges lorsqu'une feuille est retirée du système d'impression. Le retrait de la feuille de papier 12 de la surface du tambour d'impression 14 sera traité au cours de la description du functionnement du dispositif.The outer surface of the drum 14 has grooves 22 which act as guide zones for the fingers 24 introduced into these grooves when a sheet is removed from the printing system. The removal of the sheet of paper 12 from the surface of the printing drum 14 will be dealt with during the description of the operation of the device.

De chaque côté du tambour d'impression 14, on trouve des flasques 26. Les flasques 26 sont montés de façon à tourner indépendamment de l'arbre 16 qui traverse le tambour 14 dans son sens longitudinal. Un chemin de guidage 28 est prévu sur chacun des flasques 26 pour guider un bras d'actionnement incurvé 30. Un solénoïde 31 à noyau plongeur représenté schématiquement à la figure 3 déplace le bras d'actionnement 30 en rotation par l'intermédiaire de biellettes de raccordement et de pignons (non représentés), dans le chemin de guidage 28 ou hors de celui-ci. De plus, chaque flasque 26 porte un embrayage 32 à secteur denté 34 qui est monté pivotant sur un axe 33 porté par le flasque. Un levier de commande 35 solidaire de l'embrayage 32 permet de faire pivoter ce dernier, lorsque le bras 30 est engagé dans le chemin de guidage 28 et vient solliciter l'extrémité du levier 35. Des roues dentées 36 sont montées fixement sur l'axe 16 de chaque côté du tambour d'impression 14 et sont solidaires en rotation de ce dernier. Lorsque le bras d'actionnement 30 n'est pas engagé dans le chemin de guidage 28, un ressort de rappel 39 (figure 2) permet de maintenir en contact le secteur denté 34 de l'embrayage 32 avec les dents 38 de la roue dentée 36 et par conséquent de solidariser en rotation la roue 36 et le flasque 26. Lorsque le bras d'actionnement incurvé 30 est engagé dans le chemin de guidage 28, l'embrayage 32 est dégagé de la roue 36 et le flasque 26 est bloqué en rotation dans une position déterminée.On each side of the printing drum 14, there are flanges 26. The flanges 26 are mounted so as to rotate independently of the shaft 16 which passes through the drum 14 in its longitudinal direction. A guide path 28 is provided on each of the flanges 26 for guiding a curved actuating arm 30. A solenoid 31 with plunger core shown diagrammatically in FIG. 3 moves the actuating arm 30 in rotation by means of connecting rods. connection and pinions (not shown), in or out of guide path 28. In addition, each flange 26 carries a clutch 32 with toothed sector 34 which is pivotally mounted on an axis 33 carried by the flange. A control lever 35 integral with the clutch 32 allows the latter to pivot, when the arm 30 is engaged in the guide path 28 and comes to stress the end of the lever 35. Toothed wheels 36 are fixedly mounted on the axis 16 on each side of the printing drum 14 and are integral in rotation with the latter. When the actuating arm 30 is not engaged in the guide path 28, a return spring 39 (FIG. 2) keeps the toothed sector 34 of the clutch 32 in contact with the teeth 38 of the toothed wheel. 36 and consequently to secure in rotation the wheel 36 and the flange 26. When the curved actuating arm 30 is engaged in the guide path 28, the clutch 32 is released from the wheel 36 and the flange 26 is blocked in rotation in a determined position.

Comme on le voit dans la figure 2, un goujon 40 est prévu sur chaque flasque 26 au voisinage immédiat du chemin de guidage 28 pour porter un pignon central 42 et une plaque mobile 44. Le pignon central 42 est monté fixement sur le goujon 40 et la plaque mobile 44 est montée en rotation sur ce même goujon. La plaque mobile 44 peut pivoter autour du goujon 40 sous l'action du solénoïde 31 indiqué précédemment grâce à la coopération d'un têton 46 porté par la plaque 44 avec un doigt 47 porté par le bras 30. Un pignon satellite 48 est monté en rotation sur un axe porté par la plaque mobile 44 dans une position adjacente au pignon central 42 de façon que les dents du pignon 48 engrènent avec les dents du pignon 42. Du fait que le pignon 42 ne peut tourner, l'axe du pignon satellite 48 décrit un arc de cercle autour de l'axe du pignon central 42 lorsque la plaque mobile 44 pivote autour de l'axe du goujon 40, tandis que le pignon 48 lui- même tourne autour de son propre axe.As can be seen in FIG. 2, a stud 40 is provided on each flange 26 in the immediate vicinity of the guide path 28 to carry a central pinion 42 and a movable plate 44. The central pinion 42 is fixedly mounted on the stud 40 and the movable plate 44 is rotatably mounted on this same stud. The movable plate 44 can pivot around the stud 40 under the action of the solenoid 31 indicated above thanks to the cooperation of a pin 46 carried by the plate 44 with a finger 47 carried by the arm 30. A satellite pinion 48 is mounted in rotation on an axis carried by the movable plate 44 in a position adjacent to the central pinion 42 so that the teeth of the pinion 48 mesh with the teeth of the pinion 42. Because the pinion 42 cannot rotate, the axis of the satellite pinion 48 describes an arc of a circle around the axis of the central pinion 42 when the movable plate 44 pivots around the axis of the pin 40, while the pinion 48 itself rotates around its own axis.

On voit dans la figure 1 que l'arbre sur lequel les pignons 48 sont montés, porte également l'attache 50 du bord arrière de la feuille de papier. En conséquence, lorsque les pignons 48 sont entraînés en rotation, l'attache de bord arrière de feuilles de papier 50 suit leurs trajectoires de rotation. L'attache 50 est toujours rappelée vers la surface du tambour 14 par des ressorts 52 fixés à des goujons 54 montés sur le flasque 26.It can be seen in FIG. 1 that the shaft on which the pinions 48 are mounted also carries the fastener 50 from the rear edge of the sheet of paper. Consequently, when the pinions 48 are rotated, the rear edge fastener of sheets of paper 50 follows their rotational paths. The fastener 50 is always returned to the surface of the drum 14 by springs 52 fixed to studs 54 mounted on the flange 26.

Lorsque la machine est initialement placée en mode de chargement de papier, le tambour d'impression 14 tourne lentement dans le sens anti-horaire, comme on le voit dans la figure 1. La feuille de papier 12 est avancée sur le plateau porte-papier 10 sous l'attache de bord arrière de feuille de papier 50 et dans les attaches de bord avant de feuille de papier 18. Le tambour d'impression 14 poursuit sa rotation dans le sens antihoraire et la feuille de papier 12 tourne avec lui. A cet instant, les attaches de bord avant de feuilles de papier 18 peuvent être soit fermées manuellement, en basculant le levier d'actionnement 20 vers la surface du tambour 14 ou mécaniquement, par l'utilisation d'un agencement came-suiveur de came. La surface de guidage faisant fonction de came pourrait être montée sur la surface du flasque 26, dans une position adjacente au tambour 14. Le suiveur de came serait raccordé au levier d'actionnement 20 et prévu de façon à suivre la surface de guidage de la came lorsque celle-ci est entraînée en mouvement par le flasque 26 afin d'assurer l'ouverture et la fermeture des attaches de bord avant de feuilles 18. Bien que les attaches 18 ne soient pas commandées par des détecteurs, leur position de repos est détectée par un détecteur qui sera décrit ultérieurement.When the machine is initially placed in paper loading mode, the print drum 14 slowly rotates counterclockwise, as seen in Figure 1. The sheet of paper 12 is advanced on the paper tray 10 under the trailing edge fastener of paper sheet 50 and in the trailing edge fasteners of sheet of paper 18. The printing drum 14 continues to rotate counterclockwise and the sheet of paper 12 rotates with it. At this time, the front edge fasteners of sheets of paper 18 can either be closed manually, by tilting the actuation lever 20 towards the surface of the drum 14 or mechanically, by the use of a cam-cam follower arrangement. . The guide surface acting as a cam could be mounted on the surface of the flange 26, in a position adjacent to the drum 14. The cam follower would be connected to the actuation lever 20 and provided so as to follow the guide surface of the cam when the latter is driven in movement by the flange 26 in order to ensure the opening and closing of the front edge fasteners of sheets 18. Although the fasteners 18 are not controlled by detectors, their rest position is detected by a detector which will be described later.

Pendant cette opération d'alimentation de feuilles initiale, le bras d'actionnement 30, comme on le voit dans la figure 2, est engagé dans le chemin de guidage 28 et les dents 34 de l'embrayage à secteur denté 32 n'engrènent pas avec les dents 38 de la roue 36. De plus, l'attache de bord arrière de feuille 50 est ouverte et dégagée de la surface du tambour 14.During this initial sheet feeding operation, the actuating arm 30, as seen in FIG. 2, is engaged in the guide path 28 and the teeth 34 of the toothed sector clutch 32 do not mesh with the teeth 38 of the wheel 36. In addition, the sheet rear edge attachment 50 is open and released from the surface of the drum 14.

Un détecteur optique 41 de bord arrière de feuille représenté dans la figure 3 détecte le passage du bord arrière de la feuille, au travers de l'ouverture 43 ménagée dans le plateau porte-papier 10, et actionne une unité de chronologie 45 qui envoie un signal à la logique de commande d'entraînement de tambour (non représentée) pour entraîner le tambour 14 pendant une période de temps et sur une distance spécifiées afin de permettre à toute la longueur de la feuille 12 d'être tirée sur la surface du tambour 14. L'unité de chronologie 45 désexcite également le solénoïde 31 pour permettre au bras d'actionnement incurvé 30 de quitter le chemin de guidage 28 et commander les opérations mécaniques qui vont être décrites ci-après. (Les détecteurs utilisés dans la présente invention pourraient être pneumatiques, mécaniques, électriques ou une combinaison de ces divers types. A ce sujet, on se reportera à l'IBM Technical Disclosure Bulletin, juin 1977 aux pages 25 et 26, où l'on trouvera la description d'un exemple d'un détecteur de postion or feuilles approprié). Lorsque le Dm] incurvé 30 quitte le chemin de guidage 28, la plaque mobile 44 tourne dans le sens anti- horaire sous l'action du ressort de rappel 52 et amorce le mouvement de fermeture de l'attache de bord arrière de feuilles 50 vers le tambour 14. Le mouvement de fermeture de l'attache de bord arrière 50 est commandé par le pignon satellite 48 qui se déplace autour du pignon central 42 lorsque la plaque mobile 44 est entraînée dans le sens anti-horaire. Le tambour 14 poursuit son mouvement dans le sens anti- horaire et le bord arrière de la feuille de papier est maintenant fixé par l'attache de bord arrière de feuille 50 comme on le voit dans la figure 3. En même temps que l'attache de bord arrière 50 est fermée, les doigts de guidage 24 sont dégagés de la surface du tambour 14 par le même mouvement de solénoïde que celui imprimé au bras d'actionnement incurvé 30.An optical detector 41 of the rear edge of the sheet shown in FIG. 3 detects the passage of the rear edge of the sheet, through the opening 43 formed in the paper tray 10, and actuates a chronology unit 45 which sends a signal to the drum drive control logic (not shown) to drive the drum 14 for a specified period of time and distance to allow the entire length of the sheet 12 to be pulled over the surface of the drum 14. The chronology unit 45 also de-energizes the solenoid 31 to allow the curved actuating arm 30 to leave the guide path 28 and control the mechanical operations which will be described below. (The detectors used in the present invention could be pneumatic material, mechanical, electrical or a combination of these various types. On this subject, reference is made to the IBM Technical Disclosure Bulletin, June 1977 on pages 25 and 26, where a description of an example of a suitable postion or leaf detector is given). When the curved Dm] 30 leaves the guide path 28, the movable plate 44 rotates counterclockwise under the action of the return spring 52 and initiates the closing movement of the rear edge fastener of sheets 50 toward the drum 14. The closing movement of the rear edge fastener 50 is controlled by the satellite pinion 48 which moves around the central pinion 42 when the movable plate 44 is driven counterclockwise. The drum 14 continues to move counterclockwise and the trailing edge of the sheet of paper is now secured by the trailing edge clip 50 as seen in Figure 3. At the same time as the clip rear edge 50 is closed, the guide fingers 24 are released from the surface of the drum 14 by the same solenoid movement as that printed on the curved actuating arm 30.

Avant la poursuite du mouvement dans le sens antihoraire du tambour 14, une opération d'embrayage mécanique se déroule simultanément aux mouvements mécaniques décrits précédemment. Pendant cette opération d'embrayage mécanique, le levier 35 de l'embrayage à secteur denté 32 est dégagé du bras d'actionnement incurvé 30 et le secteur denté est tiré vers la roue 36 par le ressort 39 afin de provoquer l'engrenage des dents 34 et 38. Le flasque 26 peut maintenant être entraîné en rotation avec la roue 36 et le tambour 14.Before the movement in the counterclockwise direction of the drum 14 continues, a mechanical clutch operation takes place simultaneously with the mechanical movements described above. During this mechanical clutch operation, the lever 35 of the toothed sector clutch 32 is released from the curved actuating arm 30 and the toothed sector is pulled towards the wheel 36 by the spring 39 in order to cause the gearing of the teeth. 34 and 38. The flange 26 can now be rotated with the wheel 36 and the drum 14.

En mode de déchargement du papier, la logique de commande du tambour décrite précédemment localise la position du tambour où l'attache de bord arrière 50 a saisi le bord arrière de la feuille de papier 12. A cet instant, un déroulement inverse des étapes décrites précédemment est amorcé. Le solénoïde 31 est excité par l'intermédiaire de l'unité de chronologie 45 et le bras d'actionnement incurvé 30 pénètre dans le chemin de guidage 28 pour séparer le flasque 26 et l'embrayage à secteur denté 32 de la roue 36, ce qui isole le flasque 26 du mouvement rotatif du tambour 14. Le solénoïde excité en même temps que le bras incurvé 30, provoque l'introduction des doigts de guidage 24 dans les gorges 22 du tambour 14. Le solénoïde provoque également la rotation dans le sens horaire de la plaque mobile 44 et provoque le mouvement du pignon satellite 48 autour du pignon central 42 et entraîne l'attache de bord arrière de feuille 50 en même temps. Le mouvement dans le sens horaire de la plaque mobile 44 provoque la séparation de l'attache de bord arrière de feuille 50 du tambour 14. Le tambour 14 est entraîné en rotation dans le sens horaire et la feuille de papier qu'il porte suit les doigts de guidage 24 et est dirigée vers le haut sur le plateau porte-papier 10.In paper unloading mode, the drum control logic described above locates the position of the drum where the rear edge fastener 50 has grasped the rear edge of the sheet of paper 12. At this instant, a reverse sequence of the steps described previously is initiated. The solenoid 31 is excited via the chronology unit 45 and the curved actuating arm 30 enters the guide path 28 to separate the flange 26 and the toothed sector clutch 32 from the wheel 36, this which isolates the flange 26 from the rotary movement of the drum 14. The solenoid excited at the same time as the curved arm 30, causes the introduction of the guide fingers 24 into the grooves 22 of the drum 14. The solenoid also causes the rotation in the direction schedule of the movable plate 44 and causes the movement of the pinion gear 48 around the central pinion 42 and causes the attachment of the rear edge of the sheet 50 at the same time. The clockwise movement of the movable plate 44 causes the sheet rear edge fastener 50 to separate from the drum 14. The drum 14 is rotated clockwise and the sheet of paper it carries follows the guide fingers 24 and is directed upwards on the paper tray 10.

Le détecteur décrit précédemment et assurant la détection du point de serrage initial des attaches de bord avant 18 pendant l'opération de chargement, détecte à nouveau cette postion. Lorsque omw position a été détectée, le mouvement du tambour est stoppé et les attaches de bord avant de feuille 18 sont ouvertes. La feuille de papier 12 peut maintenant être retirée manuellement de la surface du tambour 14 et du plateau porte-papier 10.The detector described above and ensuring the detection of the initial tightening point of the front edge fasteners 18 during the loading operation, again detects this position. When omw position has been detected, the movement of the drum is stopped and the sheet front edge fasteners 18 are open. The sheet of paper 12 can now be manually removed from the surface of the drum 14 and the paper tray 10.

Claims (7)

1. Apparatus for clamping sheets (10) of various lengths onto a rotating drum (14) of the type including: first clamping means (18) mounted on said drum and rotatable therewith for clamping the leading edge of a given sheet onto said drum, and second clamping means (50) which can be set either in an active position or in a rest position, and adjusted with respect of said first means in accordance with the length of the sheets, for clamping the trailing edge of said sheet onto said drum when said sheet has been completely wound up around said drum, characterized in that it includes: sensing means (41) for detecting that said sheet is completely wound up around said drum and generating a sense signal in response thereto, clutch means for coupling or uncoupling, as required, said second clamping means for rotation with said drum, and control means (31) connected to said sensing means, responsive to said sense signal for setting said second clamping means and said clutch means in the active position to couple said second clamping means for rotation with said drum. 1. Apparatus for clamping sheets (10) of various lengths onto a rotating drum (14) of the type including: first clamping means (18) mounted on said drum and rotatable therewith for clamping the leading edge of a given sheet onto said drum, and second clamping means (50) which can be set either in an active position or in a rest position, and adjusted with respect of said first means in accordance with the length of the sheets, for clamping the trailing edge of said sheet onto said drum when said sheet has been completely wound up around said drum, characterized in that it includes: sensing means (41) for detecting that said sheet is completely wound up around said drum and generating a sense signal in response thereto, clutch means for coupling or uncoupling, as required, said second clamping means for rotation with said drum, and control means (31) connected to said sensing means, responsive to said sense signal for setting said second clamping means and said clutch means in the active position to couple said second clamping means for rotation with said drum. 2. Apparatus according to claim 1, characterized in that: said clutch means includes: at least one toothed wheel (36) mounted on the shaft (16) of said drum for rotation therewith and at least a rotating plate (26) freely mounted on the shaft of said drum close to said gear, which carries (at 48) an element for actuating said second clamping means, and a clutch (32) with a toothed segment (34), able to be set either in an active position or in a rest position in which it is respectively engaged or disengaged with said toothed wheel, i.e. the plate is coupled for rotation with said toothed wheel, or not, said toothed segment being mounted on a pivoting support provided with an actuating lever (35) the rotational axis (33) of which is parallel to that of said drum, the toothed sector and actuating lever assembly being normally biased towards said active position by biasing means (39), and said control means (31) includes first actuating means (30) able to cooperate with said lever to remove said toothed segment from its active position and to set it into its rest position, or to free said lever by allowing said toothed segment to come into its active position as urged by said biasing means. 2. Apparatus according to claim 1, characterized in that: said clutch means includes: at least one toothed wheel (36) mounted on the shaft (16) of said drum for rotation therewith and at least a rotating plate (26) freely mounted on the shaft of said drum close to said gear, which carries (at 48) an element for actuating said second clamping means, and a clutch (32) with a toothed segment (34), able to be set either in an active position or in a rest position in which it is respectively engaged or disengaged with said toothed wheel, ie the plate is coupled for rotation with said toothed wheel, or not, said toothed segment being mounted on a pivoting support provided with an actuating lever (35) the rotational axis (33) of which is parallel to that of said drum, the toothed sector and actuating lever assembly being normally biased towards said active position by biasing means (39), and said control means (31) includes first actuating means (30) able to cooperate with said lever to remove said toothed segment from its active position and to set it into its rest position, or to free said lever by allowing said toothed segment to come into its active position as urged by said biasing means. 3. Apparatus according to claim 2, characterized in that: said element for actuating said second clamping means (50) is an arbor parallel to the shaft of said drum, on which said second clamping means is mounted, biasing means (52) are provided for biasing said second clamping means into its active position, and said control means includes second actuating means (47) able to remove said second clamping means from its active position when said first actuating means (30) cooperates with said actuating lever (35) or to free said second clamping means (50) when said first actuating means frees said actuating lever by allowing said clamping means to come into its active position under the action of its biasing means (52). 3. Apparatus according to claim 2, characterized in that: said element for actuating said second clamping means (50) is an arbor parallel to the shaft of said drum, on which said second clamping means is mounted, biasing means (52) are provided for biasing said second clamping means into its active position, and said control means includes second actuating means (47) able to remove said second clamping means from its active position when said first actuating means (30) cooperates with said actuating lever (35) or to free said second clamping means (50) when said first actuating means frees said actuating lever by allowing said clamping means to come into its active position under the action of its biasing means (52). 4. Apparatus according to claim 3, characterized in that: the arbor of said second clamping means is freely mounted in a support plate (44) the plane of which is perpendicular to this arbor, said support plate rotates freely on an arbor fixed to said rotating plate (26) and parallel to the drum axis, a first gear (42) rotating with said support plate, is freely mounted on the rotating shaft of said support plate, a second gear (48) permanently meshing said first gear is fixedly mounted on the arbor of said second clamping means, and said support plate includes a stud (46) above either to cooperate with said second actuating means (47) to cause said means (47) to pivot said support plate around its axis and thus to cause said first and second gears to rotate in a direction tending to disengage said second clamping means from its active position, or to be kept away from said second actuating means in order to set said second clamping means into its active position under the action of its biasing means. 4. Apparatus according to claim 3, characterized in that: the arbor of said second clamping means is freely mounted in a support plate (44) the plane of which is perpendicular to this arbor, said support plate rotates freely on an arbor fixed to said rotating plate (26) and parallel to the drum axis, a first gear (42) rotating with said support plate, is freely mounted on the rotating shaft of said support plate, a second gear (48) permanently meshing said first gear is fixedly mounted on the arbor of said second clamping means, and said support plate includes a stud (46) above either to cooperate with said second actuating means (47) to cause said means (47) to pivot said support plate around its axis and thus to cause said first and second gears to rotate in a direction tending to disengage said second clamping means from its active position, or to be kept away from said second actuating means in order to set said second clamping means into its active position under the action of its biasing means. 5. Apparatus according to claim 2 or 3, or 4, characterized in that it includes: guide means (28) mounted on said rotating plate (26) for guiding said first actuating means (30) when it cooperates with said lever (35) and preventing said plate from rotating when loading a sheet. 5. Apparatus according to claim 2 or 3, or 4, characterized in that it includes: guide means (28) mounted on said rotating plate (26) for guiding said first actuating means (30) when it cooperates with said lever (35) and preventing said plate from rotating when loading a sheet. 6. Apparatus according to any one of the previous claims, characterized in that said sensing means (41) includes: means for sensing the passage of the trailing edge of said sheet when said sheet is almost completely wound up around said drum, and timing means (45) for causing the signal sensing the trailing edge of the sheet not to energize said control means (31) until the sheet is completely wound up around said drum. 6. Apparatus according to any one of the previous claims, characterized in that said sensing means (41) includes: means for sensing the passage of the trailing edge of said sheet when said sheet is almost completely wound up around said drum, and timing means (45) for causing the signal sensing the trailing edge of the sheet not to energize said control means (31) until the sheet is completely wound up around said drum. 7. Apparatus according to any one of claims 3 to 6, characterized in that: said control means (31) consists of a plunger type solenoid, said first and second actuating means (30, 47) are connected to said plunger, and said sensing means (41) de-energizes said solenoid when said sheet is completely wound up around said drum in order to allow said second clamping means and said clutch means to come into their active position under the action of their respective biasing means. 7. Apparatus according to any one of claims 3 to 6, characterized in that: said control means (31) consists of a plunger type solenoid, said first and second actuating means (30, 47) are connected to said plunger, and said sensing means (41) de-energizes said solenoid when said sheet is completely wound up around said drum in order to allow said second clamping means and said clutch means to come into their active position under the action of their respective biasing means.
EP79101720A 1978-06-28 1979-06-01 Apparatus for affixing sheets with varying lengths to a rotating drum Expired EP0006483B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92030778A 1978-06-28 1978-06-28
US920307 1978-06-28

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EP0006483A1 EP0006483A1 (en) 1980-01-09
EP0006483B1 true EP0006483B1 (en) 1982-05-12

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EP79101720A Expired EP0006483B1 (en) 1978-06-28 1979-06-01 Apparatus for affixing sheets with varying lengths to a rotating drum

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EP (1) EP0006483B1 (en)
JP (1) JPS555889A (en)
DE (1) DE2962788D1 (en)
IT (1) IT1165107B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57174285A (en) * 1981-04-20 1982-10-26 Matsushita Electric Ind Co Ltd Winding apparatus for recording paper
JPS60173353U (en) * 1984-04-24 1985-11-16 ソニー株式会社 Platen paper clamping mechanism
KR910008218B1 (en) * 1989-11-30 1991-10-12 삼성전자 주식회사 Colour printer
DE69840049D1 (en) * 1997-10-14 2008-11-06 Powis Parker Inc FILTER LABEL PRINTER AND METHOD
US20120092431A1 (en) * 2010-10-13 2012-04-19 Toshiba Tec Kabushiki Kaisha Recording medium carrying device, image forming apparatus, and recording medium carrying method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263563A (en) * 1939-10-04 1941-11-25 Blum Milton Typewriter platen
US2707545A (en) * 1951-02-27 1955-05-03 Remington Rand Inc Card holding platen
DE2024271B2 (en) * 1970-05-19 1972-11-30 Triumph Werke Nürnberg AG, 8500 Nürnberg DEVICE FOR PREVENTING THE RECOVERY OF AN EJECTED RECORDING MEDIUM IN A LUGGAGE DEVICE ON TYPING, BOOKING AND SIMILAR MACHINES
JPS4929924A (en) * 1972-07-20 1974-03-16
US4101018A (en) * 1975-08-22 1978-07-18 Teletype Corporation Paper edge sensor

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JPS555889A (en) 1980-01-17
EP0006483A1 (en) 1980-01-09
IT1165107B (en) 1987-04-22
IT7923797A0 (en) 1979-06-22
DE2962788D1 (en) 1982-07-01

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