JPH07106669B2 - Ink supply device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink replenishing device that replenishes a ribbon whose traveling direction is changed.

Conventional Technology First, a conventional example is shown in FIG. A ribbon base 1 is provided with rotatably supported ribbon drive shafts 4, 5 on both sides of the ribbon base 1, respectively, and a ribbon 6 is wound around the ribbon drive shafts 4, 5 from both ends. The ribbon spools 7 and 8 to be held are detachably attached while being prevented from rotating.

Next, the ribbon base 1 is provided with a ribbon feeding mechanism 9. This ribbon feeding mechanism 9 includes a ribbon spool 7,
A sliding body 10 that reciprocates between 8; a feed claw 12 having claw portions 11 formed on both ends for meshing with the ratchets 2 and 3; and a cam 14 having a spiral projection 13 formed on the outer circumference. Consists of. And
The sliding body 10 has a long hole 16 fitted into a guide shaft 15 provided upright on the ribbon base 1, and an engaging portion 14 engaging with both sides of the protrusion 13.
a and are formed. Further, in the center of the feed claw 12, two recesses 18 which swingably engage with a fulcrum shaft 17 provided upright on the ribbon base 1 are formed by arranging the centers symmetrically and arranging them symmetrically. Springs 20 are stretched between the portions on both sides of 18 and the pins 19 erected on the ribbon base 1.

Further, 21 is a printing head which is a printing section.
Although not shown, the carrier on which 21 is mounted has a protrusion that engages with a spiral groove formed on the outer periphery of the drive cam parallel to the platen 22, and the drive cam is rotated by a motor to move along the platen 2. It reciprocates. The cam 14 is also connected to a common motor together with the drive cam.

Further, a roller 23 that is a guide portion that guides the ribbon 6 to the front surface of the printing head 21 is provided. Further, shafts 51 that rotatably support the ink impregnating roller 50 that contacts the ribbon 6 are provided upright on both sides of the ribbon base 1.

Therefore, as shown in FIG. 3, when the feed claw 12 is tilted to the left, the sliding body 10 reciprocates in the left-right direction when the cam 14 is rotated, and the feed claw 12 is reciprocated each time the reciprocating operation is performed. The left claw portion 11 intermittently rotates the ratchet 2 together with the ribbon spool 7 in the clockwise direction. As a result, the ribbon 6 is wound from the ribbon spool 8 onto the ribbon spool 7. When the ribbon 6 on the ribbon spool 8 on the right side disappears,
Since the ends of the ribbon 6 are fixed to the ribbon spools 7 and 8, the tension of the ribbon 6 increases abnormally. That is, the ribbon spools 7 and 8 and the ribbon drive shafts 4 and 5 do not rotate. As a result, the feed claw 12 receives the resistance of the ratchet 2 when moving to the left, and moves to the right relative to the sliding body 10. As a result, the fulcrum shaft 19 rides over from the recess 18 on the left side of the feed claw 12 to the recess 18 on the right side, and the feed claw 12 is inclined upward to the right by the force of the spring 20. Therefore, the reciprocating motion of the sliding member 10 causes the right claw portion 11 of the feed claw 12 to intermittently rotate the right ratchet 3 together with the ribbon spool 8 in the counterclockwise direction.

In this way, the feeding direction of the ribbon 6 is alternately changed.

Problems to be Solved by the Invention In such a case, the left and right ink impregnated rollers 50 are always in contact with the ribbon 6. When the ink is replenished after passing through the print head 21, there is time until the traveling direction of the ribbon 6 is switched, but the ink is supplied from the ink impregnating roller 50 immediately before being pulled out to the front of the print head 21. Then, the ink is drawn out to the front surface of the print head 21 before the ink is evenly soaked in the ribbon 6, so that the ink impregnation amount becomes excessive, the print becomes unclear, or the paper becomes dirty.

Means for Solving the Problems A pair of forward and backward rotatable ribbon spools that respectively hold and hold a long ribbon, ribbon drive shafts to which these ribbon spools are respectively mounted, and these ribbons. A ribbon feeding mechanism that selectively drives the drive shaft, and a ribbon feed mechanism that is positioned between each of the ribbon spools and the printing unit and is rotatably supported in forward and reverse directions, and travels in a predetermined direction by selectively driving the ribbon drive shaft. A drum that rotates forward and backward due to contact friction with the ribbon, an oscillating body that rotates in a predetermined direction in response to the rotation of the drum, and a rotating free end of the oscillating body that opposes the ribbon so as to come into contact with and separate from the ribbon. The ink impregnator on the ribbon feeding side is separated from the ribbon and the ink impregnator on the ribbon winding side is brought into contact with the ribbon. The ribbon was contacted.

Action The ribbon spool mounted on the ribbon drive shaft driven by the ribbon feed mechanism is rotated to change the traveling direction of the ribbon, and the traveling of the ribbon causes the drum to rotate in the forward and reverse directions. The ink impregnation body can be separated from the ribbon and the ink impregnation body on the ribbon winding side can be brought into contact with the ribbon.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The same parts as those described in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. The studs 24, which are fulcrums, are erected on both sides of the ribbon base 1.
A swinging body 25 is rotatably fitted to the
A rotating body 28, which is formed by connecting a drum 26 and a gear 27, which are always in contact with the ribbon 6, is rotatably fitted. A plurality of locking projections 26a are formed at one end of the drum 26, and a locking hole 27a that engages with these locking projections 26a is formed in the gear 27. The contact surface 29 of the gear 27 to the oscillator 25 and the oscillator 25
A spring washer 30 is interposed between and. Also, the oscillating body
A gear 31 meshed with a gear 27 and an ink impregnating roller 33 as an ink impregnating body whose one end is pressed against the gear 32 are fitted to a stud 31 which is erected on the rotating free end side of 25. ing. Further, openings 35 are formed on both sides of the ribbon base 1, and stoppers 36 are formed on both sides of the openings 35 so as to come into contact with the bending pieces 34 formed on the rocking body 25.

In such a configuration, the state shown in FIG.
Is tilted upward to the left to drive the left ribbon drive shaft 4 in the clockwise direction, and the left ribbon spool 7 winds the ribbon 6. At this time, the rotating body 28 rotates clockwise due to contact friction with the ribbon 6, and since the spring washer 30 is interposed between the rotating body 28 and the rocking body 25, the right and left rocking bodies 25 are
Rotates clockwise around the stud 24 as a fulcrum. As a result, the ink impregnating roller 33 of the right oscillating body 25 separates from the ribbon 6, and the ink impregnating roller 33 of the left oscillating body 25 contacts the ribbon 6. Therefore, ink is supplied to the ribbon 6 that has passed through the print head 21, and ink is not supplied to the ribbon 6 before being pulled out to the front surface of the print head 21.

Also, as described above, when the traveling direction of the ribbon 6 is switched to the right, the rotating body 28 rotates counterclockwise due to the contact friction with the ribbon 6, and the left and right swinging bodies 25 move to the stud 24.
Rotate counterclockwise around the fulcrum. As a result, the ink impregnating roller 33 of the left oscillating body 25 separates from the ribbon 6, and the ink impregnating roller 33 of the right oscillating body 25 contacts the ribbon 6. Also in this case, the ink is supplied to the ribbon 6 that has passed through the print head 21, and the ink is not supplied to the ribbon 6 before being pulled out to the front surface of the print head 21.

Therefore, the ribbon 6 always passes through the front surface of the print head 21 and is wound around the ribbon spool 7 or 8 on the take-up side to be replenished with ink immediately before, and the ink soaks evenly due to the capillary phenomenon, and the ribbon 6 is fed in the feeding direction. Is supplied to the front surface of the print head 21 after the excess water evaporates before the reversal.
Therefore, it is possible to print clearly and the paper does not get dirty.

Further, the swinging range of the oscillating body 25 is limited by the bent piece 34 contacting the stoppers 36, 37.

The ink impregnation roller 33 is a gear meshed with the gear 27.
Although it rotates integrally with the gear 32, the gear 32 may be omitted by rotating the ribbon 6 due to contact friction with the ribbon 6.

EFFECTS OF THE INVENTION As described above, the present invention includes a pair of forward and backward rotatable ribbon spools that respectively wind and hold a long ribbon, and ribbon drive shafts on which the ribbon spools are mounted, respectively. A ribbon feed mechanism for selectively driving these ribbon drive shafts, and a ribbon feed mechanism that is positioned between each of the ribbon spools and a printing unit and is rotatably supported in forward and reverse directions. A drum that rotates forward and backward due to contact friction with a ribbon that travels, a swinging body that rotates in a predetermined direction according to the rotation of the drum, and a swinging end of the swinging body that is brought into contact with and separates from the ribbon. The ink impregnating body facing each other freely, and the ink impregnating body on the ribbon feeding side is separated from the ribbon and the ink impregnating body on the ribbon winding side is brought into contact with the ribbon. Since the ribbon is brought into contact with the ram, the ribbon spool is mounted on the ribbon drive shaft that is driven by the ribbon feed mechanism to change the traveling direction of the ribbon. ,
As a result, the ink impregnated body on the ribbon feeding side can be separated from the ribbon and the ink impregnated body on the ribbon winding side can be brought into contact with the ribbon, and the ink impregnation amount immediately before the printing portion becomes excessive. It is possible to prevent such a situation, perform clear printing, and prevent the paper from being soiled.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is a plan view, FIG. 2 is an exploded perspective view showing a supporting structure of an oscillating body, an ink impregnating roller, and a rotating body, and FIG. 3 is a plan view showing a conventional example. 4,5 …… Ribbon drive shaft, 7,8 …… Ribbon spool, 9 ……
Ribbon feeding mechanism, 21 …… Printing head (printing section), 23 ……
Roller (guidance part), 24 …… stud (support point part), 25 ……
Oscillator, 26 …… drum, 28 …… rotating body, 29 …… contact surface,
33 ... Ink impregnation roller

Claims (1)

[Claims] 1. A pair of forward and backward rotatable ribbon spools for winding and holding a long ribbon from each end, ribbon drive shafts to which these ribbon spools are respectively mounted, and these ribbon drive shafts. A ribbon feeding mechanism that is selectively driven, and a ribbon that is positioned between each of the ribbon spools and the printing unit, is rotatably supported in a forward and reverse direction, and runs in a predetermined direction by selectively driving the ribbon driving shaft. A drum that rotates normally and reversely due to contact friction, an oscillating body that rotates in a predetermined direction in response to the rotation of the drum, and ink impregnation that is provided at a free end of rotation of the oscillating body and faces the ribbon so as to come in contact with and separate from the ribbon. The ink impregnated body on the ribbon feeding side is separated from the ribbon and the ink impregnated body on the ribbon winding side is brought into contact with the ribbon. The ink supply device, characterized in that allowed.