FR2459136A1 - MECHANISM FOR SELECTING AND PRINTING CONTROL FOR WRITING MACHINE - Google Patents

Abstract

THE INVENTION CONCERNS A PRINT SELECTION AND CONTROL MECHANISM INCLUDING A PRINTING ELEMENT 1 MOVING ON A CART ALONG A PUNCHING CYLINDER. THE PRINTING ELEMENT IS EQUIPPED ON ITS PERIPHERY WITH A SET OF CHARACTERS DIVIDED INTO TWO GROUPS ALTERNATIVELY SELECTED BY A MOTION MECHANISM, AND LOCKING MEANS LOCKING THE PRINTING ELEMENT IN PRINT POSITION OF ONE CHARACTER . THE MECHANISM IS CHARACTERIZED IN THAT IT INCLUDES A RETAINER 18, 25, 26 LOCKING MEANS SENSITIVE TO A NON-PRINTING COMMAND TO BE MADE ACTIVE WHEN THE MOTION DEVICE IS ACTUATED. THE MECHANISM, SUBJECT OF THE INVENTION, IS APPLICABLE TO WRITING MACHINES INCLUDING IN PARTICULAR A SPHERICAL PRINTING ELEMENT.

Description

2,459.36

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  IDEPS40SION SELECTION AND CONTROL MECHANISM FOR

TYPEWRITER

  The subject of the present invention is a mechanism for

  and a typewriter printing command having a carriage carrying a printing element and moving along a driving shaft parallel to a striking cylinder, the printing element being provided on its periphery of a set of characters divided into two groups, this mechanism being actuated by the motor shaft and

  comprising a decoding device controlling a device

  tif of motion to select at will one of these two groups of characters, a selection device

  intended to bring into print position one of the characters

  selected group, locking means of the-

  printing element in the printing position of this character

  re, and a print control device ensuring the im-

  pressing or not printing the character in a position of im-

  pressure. A mechanism of this type is described in the patent

  French No. 2.126.882. In this kind of mechanism, non-compliance

  impression is associated with the selection of a group of characters

  ters or motion. When making a motion order, the tree of

  command makes a rotation of a determined angle, generally

  a complete revolution, in order to provide the trolley with energy

  necessary for the decoding device.

  The rotation of the control shaft causes the means

  lock while no printing was ordered.

  This results in useless and uneven wear of the said means of

  lock, especially since the position of the element of

  impression during the motion does not necessarily match

  to the print position of a character.

  The object of the present invention is to avoid this

on locking means.

  For this purpose, the mechanism according to the invention is

  characterized in that it comprises a device for retaining

  locking means responsive to a non-printing control

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  Zion to be made active when activating the

motion.

  The attached drawing represents, schematically and by way of

  example, a form of execution of the mechanism object of the in-

vention.

  FIG. 1 is a profile view in section of a chain.

  mobile riot showing the locking means.

  FIG. 2 is a perspective view of the device

  retaining said locking means.

  The type of single-headed typewriter chosen is well known to industry specialists,

  only the organs indispensable to the understanding of the in-

  will be illustrated and described in what follows.

  y The printing element 1, illustrated in FIG.

  the shape of a sphere portion bounded by two planes perpendicular to a polar axis XX '. All signs and characters intended to be printed by the machine, here

  number of ninety-six, appear in relief on the surface.

  spherical face 2. They are divided into four parallel rows

  in both plans, at the rate of twenty-four

  or characters per row. Disposed on twenty-four merit

  they, therefore, form as many columns in the

  periphery of the printing element. The devices for

  rows and columns are well known and

  described in French Patent No. 2,126,882, they do not

will not be described below.

  The print head 1 is secured to a carriage 3 a-

  a translation movement parallel to the axis of

  4. In this translational movement, the carriage 3 slides along a drive shaft 5 pivoted to

  both ends on the frame of the machine, not

  tee, and along a bar 6 attached to this frame.

  The printing element 1 is supported by a base 7 fixed to an oscillating support 8. This support 8 is mounted between the two lateral faces 9 of the carriage 3, only one of which is shown in the drawing, so as to be able to oscillate around

2 45 9 136

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  an axis parallel to the axis of the striking cylinder 4.

  When a character is struck, the support 8 oscillates rapidly by an angle θ to bring the character occupying the position P into contact with the striking cylinder 4 under a control device. 'impression. Known locking means make it possible to fix the position of the printing element 1 during the striking

of a character.

  These locking means are constituted by a cou-

  toothed ring 10 integral with the print head 1 and

  Panning with a pivoting finger 11 and by a toothing, not re-

  presented, cooperating with a second finger to fix the

  of the selected character. The ring gear 10 comprises twenty-four teeth corresponding to the twenty-four columns

of characters.

  The pivoting finger 11 and the second finger are actuated

  through an arm 12 rotated to one of its ex-

  tremities on the oscillating support 8 and bearing at its other end against a lever 13. This lever 13 pivots on

  a support piece 14 fixed to the lateral face, not shown

  felt, the carriage 3 and has at its lower end a finger 15 cooperating with an axial cam 16 secured to

the control shaft 5.

  The support piece 14 has a fold 17 on which

  is pivoted a pawl 18. This pawl 18 is subject to the ac-

  tion of a spring 19 which tends to make it

  The lever bears against a second lever 26 which abuts against a pin 28 of the interposer of

  non-printing control 23 under the action of a spring 27.

  According to non-printing, the pawl 18 comes to bear against an adjustable stop 20. The latter

  consists of a screw 20 mounted in the support piece

  port 14 and blocked by a locknut 21. The free end of the pawl 18 engages under the arm 12 and presents a

retaining nose 22 for this arm 12.

  The control shaft 5 rotates one turn at -4-

  whenever an impression or motion order is trans-

  placed in the carriage 3 via a device for

  coding. The latter includes interposers 23 actuated by universal bars 24 of which only one is shown in the drawing. When printing, the non-printing interposer 23 is not lowered, the levers 25 and 26 remain in place

  and the spout 22 of the pawl 18 remains free from the arm 12,

  thus leaving the locking of the head,

  defined by the profile of the axial cam 16, take place normally

during the strike.

  During a motion order, associated with a command

  of non-printing, the non-printing interposer 23 is

  lowered by pivoting the lever 26 which, through

  25 of the lever, allows the pawl 18 to abut against the stop screw 20 under the action of the spring 19, the spout 22 of the pawl 18 is thus on the path of the arm 12 and prevents it from transmitting by means of locking

  the movement of the lever 13. The screw 20 makes it possible to adjust the po-

  assembly of the pawl 18 at the arm 12 when the support

  oscillating 8 is in the rest position and the non-printing

sion is ordered.

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Claims (3)

R E V E N D I C A T I 0 N S   1. Printing selection and control mechanism for a typewriter having a carriage (3) carrying a printing element (1) and moving along a driving shaft (5) parallel to a cylinder (4), the   printing unit (1) being provided on its periphery with a   seems to be divided into two groups, this mechanism   being actuated by the motor shaft (5) and comprising a   Positive decoding commanding a device of motion   selecting at will one of these two groups of characters, a selection device intended to bring   in the printing position one of the characters of the group   selected, locking means (11) of the element   printing (1) in the printing position of this character, and   a print control device (23) ensuring the im-   pressure or the non-printing of the character in the   printing, characterized in that it comprises a retaining device   (18,25,26) control responsive locking means   of non-printing to be made active during the action- ment of the motion device.   2. The mechanism according to claim 1, wherein the   printing is a spherical print head (1)   supported by an oscillating support (8), the locking means   lage (11) being controlled by means of an arm (12) pivoted on the oscillating support (8) and bearing against the end of a lever (13) cooperating with an axial cam (16) integral with the motor shaft (5), characterized in that the retaining device is constituted by a pawl (18) having a retaining nose (22) intended to cooperate with   end of the arm (12) when ordering non-printing if we.   3. Mechanism according to the set of claims 1 and 2,   characterized in that it comprises a spring (19) acting on the pawl (18) to make it bear against a lever (25) which   is retained by a non-printing controller (23).