JPS6321618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-impact dot printing machine having an ink-jetting printing head mounted on a movable carriage and having an elongated container for ink.

The object of the invention is to provide a printing press of the above type in which the ink containers can be easily replaced. The present invention is a non-impact dot matrix printing machine in which an ink-jetting printing head mounted on a carriage movable parallel to the printing platen is constructed of an insulating material at one end adjacent the printing platen. an elongated container made of an insulating material, which has an orifice for ejecting ink at one end thereof and a terminal portion at the other end, the terminal portion being closed with a cap member made of a conductive material that contacts the ink; a pair of spaced apart resilient forks resiliently gripping the container to releasably hold the central portion of the container in the carriage, the cartridge selectively actuated to pulse the ink; said printing head has a conductive leaf spring fixed to said carriage, said leaf spring being reciprocating along a conductive metal guide connected to the negative pole of a high voltage generator to a first portion in slidable and permanent contact with the guide of the cartridge; and a first portion in contact with the cap member of the container when the container is attached to the cartridge and providing electrical connection from the high voltage generator to the ink. and a second part for making connections.

According to FIGS. 1 and 3, walls 11b, 11c, 11
d and a bottom 12 enclosing all the components of the printing press according to the invention. The DC motor 15 is housed within a housing 16 and has a vertical rotation axis. A vertical shaft 22 is formed integrally with the cover 20, on which rotates a pulley 23 with a hub 24, the pulley having cylindrical parts 25, 26 connected to the hub 24 by spokes 27.

On the upper cylindrical portion 25 is a variable pitch screw 28.
The lower cylindrical portion 26 is provided with a straight toothing 29 that engages a toothed belt 30 that engages a sprocket wheel 31 of the shaft 32 of the motor 15. ing.

The carriage 48 is fixed to the casing 10.
It can slide on two parallel cylindrical guides 50, 51. The carriage 48 consists of a lower elongate member 52 transversely to the guides 50,51, which member 52 is rigidly connected to an elongate support 53 in a direction parallel to the guides 50,51. Carriage 4
The lower part 52 of 8 is provided with a linear slot 54 perpendicular to the guides 50, 51, and the support 53 fastens two sliding blocks 55, 56 which can slide on the guides 50. An opening 62 through which the guide 51 passes is provided at one end 60 of the lower member 52. A disc 65 is rotatable on the free upper end of the shaft 22 and is supported by a collar 66 forming part of a rib 67 inside the casing. The disc 65 connects to the pulley 2 through two pegs 68 that are integrated with the pulley 23.
It is rotated by 3.

A peg 70 with a vertical axis is fixed to the disc 65 near its outer edge and engages the slot 54 so that when the disc 65 rotates, the carriage 48 moves in a harmonic motion through the guide 50. ,51
It is now possible to drive back and forth along the route. Disk 6
A circular slot 71 provided on the lower surface 72 of the peg 7
It is eccentrically offset by 180° with respect to zero.

Slider 90 is slidable on transverse guides 91 fixed to casing 10 and includes pegs 92 engaged in grooves or slots 71. Slider 90 also includes a weight 93 consisting of a block of lead to balance the effect of the weight of carriage 48 on disc 65.

Carriage 48 also includes a metal blade 128 having two sets of equally spaced straight slots 130 and cooperating with printed circuit board 120 to generate a synchronization signal. In particular, the printed circuit board 120 is fixed to the ribs 121 of the casing 10;
It carries a double comb-shaped track 122 consisting of a pair of longitudinal strips 123, each strip 123 having a plurality of arms 124 having a width L and equally spaced apart at a pitch P. Be equipped.

As previously mentioned, the slide 90 includes a weight 93 to offset the inertia of the reciprocating carriage 48.

A platen 80 made of a material with a high coefficient of friction (for example rubber) is secured within the casing 10 to a rotatable shaft 81 . Platen 8
0 supports a blank strip 82 to be printed. A toothed belt 86 is suspended from a toothed pulley 84 which is keyed to the shaft 81. This toothed belt is also suspended on a toothed pulley 88 which is rotatable on the shaft 34 and is integral with the helical gear 35 which engages with the screw 28. The screw 28 has three longitudinal parts A, C,
It has a pair of portions B (only one shown in FIG. 3) inclined at an angle α with respect to E. Thus, the screw 28 is adapted to control the line spacing of the paper strip 82 at a given time with respect to the lateral movement of the carriage.

A resilient metal strip 89 secured to the casing 10 urges and guides the paper strip 82 against the platen and partially surrounds the platen 80 to form an electrode in a manner to be described below.

There are two forks 9 on the top of the carriage 48.
5 and 96 (Figs. 3 and 4) are fixed, and a container 100 made of a heat-resistant insulating material (for example, glass, quartz, ceramic material, heat-resistant resin) is held between these forks. It snaps onto the seat between the forks by applying pressure. Container 100 is positioned perpendicularly to platen 80 and contains ink. The ink is in the form of a cylindrical rod 102 consisting of a solid mixture of powdered graphite and a resin binder as disclosed in GB 2014514.

End wall 105 of the vessel facing platen 80 has a small diameter bore or orifice 106 . The ink stick 102 is pressed against the end wall 105 by a metal spring 107 held by a substantially cylindrical metal cap 110 that is fitted and secured to the container 100 to close the other end 112 of the container.

A leaf spring 115 fixed to the carriage 48 has two elastic arms 116 and 11 located orthogonally to each other.
7, arm 116 applies a force to cap 110 to hold it in a sealed position, and arm 117 slides over metal guide 51 to electrically connect ink rod 102 to metal guide 51.

To make it easy to replace the container 100 when the ink runs out, forks 95, 96 are provided.
A grip 103 in the form of a plastic saddle, which can be inserted between the forks and has a length equal to the distance between them, is fixed to the central part of the container 100.

In operation, the high voltage generator can be selectively activated to provide pulses to the ink rod through spring 115, cap 110, and spring 107, with the pulses being negative with respect to counterelectrode 89. The counterelectrode is in the form of a stationary plate and extends along platen 80 for a length at least equal to the stroke of carriage 48, as shown in FIG.

In a second embodiment of the invention, the peg 70 is
Discs 276 (fourth and fifth) rotatable about vertical axes are coupled to weight 93 to balance the inertia of the carriage so that the carriage moves laterally in a reciprocating harmonic motion in substantially the manner previously described. (Fig.).

The print head is actuated by a strobe signal obtained by an optical transducer 250 comprised of a light emitting diode, a phototransducer 254, and a strobe disk 256 (with a slot 258 near its periphery).
The strobe disk 256 is rotatable on a bush 66 integral with the horizontal rib 66' of the casing 10 and is fixed to a wheel 262 having a hollow hub 264. The support disk 265 is a strobe disk 256
It fits into the hub 264 for locking, and also carries a ring gear 269 that meshes with the toothed belt 30.

A pin 274 is mounted inside the hollow hub 264 and is integral with a disk 276 having a screw 277 on its circumferential surface 278 . The screw 277 engages a wheel 280 with a front peg 281 and the wheel 280
rotates on a shaft 282 parallel to printing platen 80. The wheel 280 has two pairs of gears 283,
platen 80 via 284 and 285, 286
Gear 286 is connected to drive shaft 81 of platen 80 by a one-way clutch (not shown).

To facilitate the insertion of the container between the two elastic forks 95, 96, a leaf spring 316 is fixed to the end 60 of the carriage 48, this leaf spring having two mutually orthogonal arms 317, 318. . Arm 317 is bent to form a loop 319 and has a straight section 320 located below metal cap 110 having a curved outer surface. On the other hand, the bent end of the arm 318 is elastically pressed against the metal guide 51 so as to constitute a sliding contact.
When container 100 is inserted between forks 95, 96, cap 110 contacts portion 320 of spring 316.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view of a first embodiment of a printing press according to the present invention. FIG. 2 is an enlarged sectional view taken along the - line in FIG. 3. FIG. 3 is an enlarged sectional view taken along the - line in FIG. 1. FIG. 4 is a longitudinal sectional view of a second embodiment of the printing press of the present invention. FIG. 5 is a front view of a detailed part of FIG. 4. 48...carriage, 50,51...guide,
80... platen, 89... counter electrode, 95, 96... fork, 100... container, 103... grip, 102... ink stick,
106... Orifice, 107... Spring, 110
... Cap, 115 ... Spring, 116 ... Arm, 316 ... Spring, 317, 318 ... Arm.

Claims (1)

[Scope of Claims] 1. A non-impact dot matrix printing machine, comprising an ink-jetting printing head mounted on a carriage movable parallel to the printing platen, made of an insulating material and mounted on the printing platen. an elongated container 100 made of an insulating material, which has an orifice for ejecting ink at one adjacent end and a terminal portion at the other end, the terminal portion being closed with a cap member made of a conductive material that contacts the ink; and the carriage 48. a pair of spaced apart resilient forks 95, 96 fixedly attached to the ink cartridge for resiliently gripping the container to removably hold the central portion of the container in the cartridge; The printing head is movable reciprocally along a conductive metal guide 51 connected to the negative pole of a high voltage generator which is selectively actuated to apply pulses, and the printing head is moved along a conductive leaf spring fixed to the carriage. 316, the leaf spring has a first portion 318 that is in permanent sliding contact with the guide of the carriage, and a first portion 318 that is in continuous sliding contact with the cap member of the container when the container is attached to the carriage. a second part 317 making an electrical connection from a high voltage generator to said ink. 2. In the printing machine according to claim 1, the container comprises a cylindrical main body and a grip 103 fixed to the main body, and the grip allows the container to be attached to and removed from the pair of forks 95 and 96. A printing press characterized by axial positioning.