FR2633559A1 - PAPER DISPLACEMENT DEVICE FOR PRINTER - Google Patents

Abstract

The invention relates to a device for moving sheets of paper. The device comprises a member mounted on a carriage 27 of the printer and intended to move aside the support bar 51 provided with rollers 53-55 at the end of each line, when the roller 11 advances by one step. A continuous sheet of paper is held on roll 11 and in draw members which are coupled to or decoupled from the drive motor of roll 11 by control of a handle, so that a cut sheet of paper can advance independently of a continuous sheet still in position on the roll 11. Application to computer printers.

Description

The present invention relates to a device for moving paper and

  support device for a printer, and more specifically such a device which makes it possible to hold the continuous media in the ready position even when the printing is done.

  killed on a paper cut sheet.

  Although it has already been proposed to realize the mechanism for moving paper from a printer

  in such a way that cut leaves and

  As a result, the paper could be removed completely from the traction members used for example for feeding the paper when the printing was performed on separate cut sheets. Examples of such known constructions are described, for example, in U.S. Patent Application No. 422,947 filed by the Applicant. It is known that the need for complete removal of the continuous support of paper before

  printing on cut leaves requires

  important intervention of the operator at each change. Such time consuming operator intervention is particularly troublesome in the case of use in

  an office, when frequent changes between the

  continuous port and cut leaves are common in

the daily work.

  The invention relates in particular to the production of a device for moving continuous sheets and cut sheets in a printer, enabling the continuous sheets to be held in the ready position while the printing is performed on a cut sheet, this device allowing simple advance of cut leaves

  to a roll as in a classic typewriter.

  In addition, the device allows the advance of a continuous support.

  naked, perforated at its edges, under the control of conventional traction assemblies that cooperate with the perforations of the edges. Such a device is extremely reliable, it is very convenient for the user, and it has a further

  relatively simple and inexpensive construction.

  More specifically, in a device for moving continuous or cut sheets realized

  according to the invention, the paper on which

  the impression is advanced in front of a modern print head.

  bile in translation, under the control of a roll placed horizontally. A guiding device is intended for

  guide a cut sheet from above

  tangentially, in contact with the back of the roll and to follow the underside of the roll before passing in front of the moving head of printing. Another device comprising a pair of traction assemblies for advancing a perforated continuous sheet at its edges,

  is intended to advance the tangential continuous sheet

  Then the sheet is in contact with the lower part of the roll, the sheet then following the roll to the printing position. A motor device is provided for rotating the roll so that the paper is advanced in front of the print head. A clutch operated by a lever can be put in a first position in which the traction devices are driven in synchronism

  by the motor with the roller and in a second posi-

  in which the traction devices are

  trimmed with the roller drive. So,

  continuous sheets may remain ready in the

  positive traction while printing is performed

on cut leaves.

  Other features and advantages of

  the invention will emerge more clearly from the description which will

  follow, made with reference to the accompanying drawings on the

what:

  Figure 1 is a perspective of a mechanistic

  printer me made according to the invention, seen from above, from the right front corner; Figure 2 is a perspective view of the mechanism of Figure 1, viewed from above and the right rear corner, showing traction devices advancing the continuous sheets in the mechanism;

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  FIG. 3 is a right side elevation showing the clutch mechanism controlled by FIG.

  lever, intended to selectively release the tractors

  continuous sheets; Figure 4 is an exploded perspective of a

  part of the mechanism, representing a cam that controls a bar

  support of the paper; and FIG. 5 is a plan view of a portion of the

  mechanism, illustrating the interaction of the cam and a

  positive mounting carried by the carriage with the head of im-

pressure.

  In the various figures, the references identi-

  corresponding elements.

  FIG. 1 represents a conventional roll 11, that is to say a roll of a type commonly used in

  typewriters. The roller 11 is driven by the

  intermediate of a gear train 13 to 15, from a pinion 17 mounted on the shaft of a stepping motor, the latter being placed behind an element 19 of the end frame

  printer as a whole and therefore not visi-

ble in figure 1.

  A conventional print head 21 of the type

  tracing, for example with needles or pins, is mounted on the carriage assembly 27 which moves on guides 31 so that the head moves in translation along the roller 11. A ribbon cartridge 33 contains a ribbon

  endless part of which is arranged along the roll.

  Thus, proper control of the print head allows the formation of printed characters on a sheet of paper disposed on the roll 11. Preferably, the print head carries a rotatable tape moving member 37 for providing vertical positioning of the

  ribbon, that is, to select different color bands

  Rees. Such a tape moving member is described in more detail in U.S. Patent Application No. 542,525, filed with assignee on behalf of the Applicant.

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  The carriage 27 carrying the print head 25 is moved by a servomotor 41 coupled to the carriage 27 by an intermediate gear 43 and an endless belt 45 which passes over pulleys 47 placed near the ends of the guides 31. The coordination of the operations of the different motors and the print matrix head is preferably controlled by a dedicated microprocessor and software package.

  in a conventional manner in this technique.

  The paper that follows the rotary roller 11 is

  maintained against it by a set 51 to bar

  as well as by fixed rollers placed under the roller and behind it (not shown). The bearing assembly 51 comprises three sets 53 to 55 with rollers carried on a rod 57 which is itself mounted on two arms

  articulated 58 and 59. These arms are repulsed by an

  resilient arrangement 61 toggle so that the support assembly is stably held in one of two positions, a bearing position in which the rollers are pressed against the roller 11 and a separate position

  in which the rollers are separated from the roll, by pivots

  for example, for the initial introduction of a

new sheet of paper.

  During normal printing, the carriage 27 carrying the print head moves over almost the distance allowed by the guides 31. In another mode

  embodiment, the carriage can be moved in transla-

  by the motor 41 under the control of the microprocessor to a far right position in which the mounting member 81 carried by the carriage can come into contact with a cam 83 C which is articulated on a support 84 carried by the 19 end frame of the printer. The cam 83 is hinged to the support 84 and carries an axis 85 which passes through the end plate of the printer frame and passes into a slot 87 formed in one

  arms 59 which holds the rod 51 of the support assembly.

  As shown in FIG. 5, the displacement of the carriage 27 towards its extreme right position causes the contact of a surface 87 of the assembly member 81 with

  a complementary surface 89 formed on the cam 83, pro-

  thus camming a rotation of the cam in the direction

  milking clockwise, in plan view. As a result of this movement, the axis 85 causes pivoting of the support assembly 51 in the disengaged or remote position of the roller 11. As previously indicated, this position is stably maintained by the operation

spring 61 toggle.

  On the other hand, when the carriage moves away from its extreme right position, a second contact surface 91 in the form of a lug, disposed on the member 81 for mounting the carriage, cooperates with a facing surface 93 formed on the cam 83, so that it rotates in the

  clockwise when the carriage is moving

  place to the left. This movement in the direction of the

  the one of a watch of the cam 83 causes a pivoting of the structure 59 of the support arm under the control of the axis

  or pin 85, so that the support member is recalled elastically

  In the working position, that is to say the position in which the rollers 53 to 55 bear against the rotating roller 11. This position is still maintained by the spring 61, while the carriage moves further.

  to the left, that is to say along the line of print-

  completely remote from the cam 83.

  During operation, the communication device

  The microprocessor control moves the carriage to its rightmost position each time an operator has to introduce a new sheet of cut paper or must initiate advance of the leading edge of a continuous sheet transmitted by the traction devices 61 and 63. When the leading edge of the paper is passed through the roller assembly and is above the level of the print head and the bar 57, the print head is moved to the left and causes a displacement toward the printer. front of the support device, in working position in which the rollers 53

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  at 55 are in contact with the paper and hold it against the roll. Paper, especially when it includes forms in several parts, is not left free on the roll. As can be appreciated by those skilled in the art, this clamping facilitates a clean and efficient printing, especially with a matrix print head

shock of the type shown.

  Referring now to FIG. 2 which shows the rear face of the printing mechanism, in which two essentially conventional assemblies 61

  and 63 pulls are mounted so that they can slide

  be on two bars 65 and 67 guide. The bar 67 is essentially a fixed guide while the bar 65 has a groove and can be selectively rotated so that the drive movement is coupled to the traction members in a conventional manner. For this purpose, the shaft 65 of the guide bar carries a pinion gear 67. A pinion 69 is mounted on a support plate 71 articulated on the axis of the shaft 65, that is to say that its pivot is concentric with the pinion 67. In addition, the pinion 69 is in

taken with sprocket 67.

  A lever 73, manually controlled, is articulated on the end member 19 of the frame, and is biased towards one of the two stability positions by a spring 75 of a toggle mechanism. The lever 73 has a tab 74 which moves in a slot 76 formed in the plate 71 so that the plate can be moved or switched between two stability positions. In the first of these positions, the idler gear 69 is brought into contact with the pinion 14 which forms part of the gear train driving the roller 11. In this position, the traction members 61 and 63 are thus driven in synchronism with the roller. 11, the various gear ratios being chosen so that the paper speed is the same at the traction members and the roller. In the second position, the pinion 69 is spaced from the pinion 14, although

  that the traction members 61 and 63 are disengaged from the

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  positive roller training. This arrangement is shown in more detail in FIG. 3. If appropriate, an electromagnet may operate the lever or a

  Electrically operated clutch can be used.

  - In addition to the movement of the pinion 69 away from the pinion 14, the operation of the lever 73 also causes the operation of a microswitch 79 by an arm 77 of the plate 71. The microswitch 79 indicates to the microprocessor control device which coordinates the operation

  of the printer, that the lever has been adjusted.

  It is understood that the invention has been described and shown only as a preferred example and that any technical equivalence can be provided in its constituent elements without departing from its

frame.

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Claims (2)

  1. Leaf moving device   born to a printer, characterized in that it comprises: a horizontal roller (11), a printing head (21) movable in translation   at the front of the roll and intended to ensure   on a paper placed on the roll, a device for guiding a cut sheet from the top tangentially into contact with the back of the roll, a device (61, 63) for advancing a continuous sheet of paper, paper tangentially in contact with the lower portion of the roll (11),   a motor for driving the roller   to advance the paper in front of the head of pressure, and   a clutch (14, 69, 73) which can take a first   first state in which the feed device is driven by the motor in synchronism with the roller and a second   state in which the advance device is separated from the   roller, so that continuous sheets can be kept ready in a pulling device while printing is performed on a cut leaf.   2. Device for moving continuous sheets in a printer, characterized in that it comprises: a horizontal roller (11), a printing head (21) movable in translation of the front side of the roller and intended to insure a print on a paper placed on the roll,   a device (51) comprising Dresden rollers   ss (53-55) for guiding a cut sheet from the top tangentially into contact with the back of the roll, a device comprising a pair of pull assemblies (61,63) for feeding paper having perforations at the edge so that this sheet continues 9 2633559   forward from the rear tangentially in contact with the rear of the roller, a motor for driving the roller in   rotation so that the paper moves in front of the print head.   a clutch (14, 69, 73) controlled by a lever and able to assume a first position in which the   traction device is driven by the engine in synchro-   with the roller and a second position in which   the traction device is separated from the driving device   rolls so that the continuous sheets can be kept ready in the pulling device during   that printing is done on a cut sheet of paper.