JPS60129290A - Ribbon feeder - Google Patents

Abstract

PURPOSE:To feed a printing ribbon at a fixed velocity and prevent the ribbon from being positionally staggered or slipping off, by a method wherein the outside diamter of a roll of a ribbon on a spool is detected by an outside diameter detecting means, and the rotating speed of the spool is controlled. CONSTITUTION:An outside diameter detecting lever 12 is fitted on a carrier 1 through a holding member 13 so that it can be turned, and is pressed against the ribbon 10 by a spring 14. A resistor 15 and a conductor 16 are provided along an arc of a circle having the member 13 as a center, and a conductive part 17a of a slidable lever 17 provided at a part of the lever 12 is slidden on the resistor 15 and the conductor 16. Based on the fact that the resistance between an end of the resistor 15 and the conductor 16 is decreased with an increase in the diameter of the roll of the ribbon on the spool 5 side, the rotating speed of a motor 20 is lowered through a controlling means to maintain a fixed feeding velocity of the ribbon 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a 17% feeding device for a printing machine.

[Technical background of the invention and its problems]

In general, in a printing machine adhesive feeder in which a 2-pull type resin is mounted on a carrier, the means for rotating the spool are those in which the spool is directly rotated by a motor attached to the carrier, and the wire in parallel with the platen. There is a method in which this wire is wound around a pulley attached to a carrier, and the spool is rotated using the movement of the carrier.

However, when the take-up spool is rotated at a constant speed using the above method, as the outer diameter of the lysine wound on the spool increases, the feed speed of the spool increases by MK.
There was a problem. Therefore, if you start winding lysine when the diameter of the lysine on the take-up side spool is large and the diameter of the glue on the supply side spool is small, the supply side spool will have to suddenly feed out a large amount of glue. .

For this reason, the tension applied to the lysine at the beginning of the print head is large, and an abnormally large force is applied to the lysine guides that guide the lysine on both sides of the print head, causing deformation of the lysine guides, resulting in There was also a risk that the position of the (+) button would shift vertically, causing it to come off the guide.

[Purpose of the invention]

The object of the present invention is to keep the lysine feeding rate constant and to maintain the lysine feeding rate at a constant rate.
We have developed a lysine feeding device that prevents damage to the rinsing guide, prevents the rinsing material from shifting vertically or coming off the rinsing guide, improves print quality, and reduces lysine consumption to improve economic efficiency. It is about providing.

[Summary of the invention]

In order to achieve the above object, the present invention includes a pair of spools for winding a print ribbon multiple times from both ends, which is disposed in front of a print head, and a drive means for rotating the spools.
an outer diameter detecting means for detecting the outer diameter of the spring wound around at least one of the spools; an output means for changing the output according to the state of the outer diameter detecting means; A ribbon feeding device is provided which is provided with a control means for changing the rotational speed of the spool by changing the input of the driving means.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a plan view showing the peripheral area of the carrier 1 of the printing machine, and FIG. 2 is a side view of the printing machine. There is. Note that a driving means for moving this carrier 1 is omitted in the drawing. career 1
A print head 4 is mounted on the top so as to face the platen 3. Also, on carrier 1 there is a pair of 7 pools 5,
Spool gears 8 and 9, which rotate together with the spools 5 and 6, are attached to the lower ends of the spools 5 and 6 via locking devices 7, respectively. A print ribbon 10 impregnated with ink is wound around these spools 5, 6 multiple times from both ends. In addition, a pair of left and right glue zen guides 11 are rotatably installed on the carrier 1, and the in-clean 1O is attached to these glue zen guides 1.
1 and is placed in front of the printing pad 4. Further, an outer diameter detection means, that is, an outer diameter detection lever 1
2 is rotatably mounted on the carrier 1 via a holding member 13. This detection lever 12 has a spring 14
It is wound around the spool 5 on the right side and pressed against the Zener 1o. Further, on the carrier 1, a resistor 15 and a conductor 16 are attached in an arc shape centered on the holding member 13. A conductive part 17a is attached to the tip of the sliding lever 17, which is a part of the outer diameter detection lever 12, and this conductive part 17a is connected to the resistor 15 and the resistor 17a as the outer diameter detection lever 12 moves. It slides on the conductor 16. Also, switches 18 and 19 are provided at both ends of the resistor 150, so that when the winding diameter of the glue line 1o on the spool 5 side becomes the minimum, the sliding lever 17 operates one switch 18, and the IJ
,]? When the winding diameter of the winding 10 reaches its maximum, the sliding lever 17 activates the other switch 19.

On the other hand, on the back side of the carrier 1, there are a pair of spools 5 and 6.
A motor 2O serving as a driving means for selectively driving these spools 5 and 6 is fixed at positions equidistant from each other, and a coaxial gear 22 is fixed to the shaft 2 of this motor 2°. .

Further, a rotating plate 23 is rotatably attached to the carrier 1 concentrically with the shaft 21, and an idle gear 24 is rotatably attached on the rotating plate 23. The idle gear 24 meshes with the coaxial gear 22, and when the rotating plate 23 rotates in the same direction as the rotation direction of the motor 20, it meshes with either of the spool gears 8, 9. It has become.

Note that when the one switch 18 is activated, the motor 20
A switching signal P1 for rotating the motor 20 in the forward direction is generated, and when the other switch 19 is operated, a switching signal P2 for rotating the motor 20 in the reverse direction is generated. Further, the resistance value between one end of the resistor 15 and the conductor 16 changes depending on the ribbon diameter on the spool 5 side, and the resistance value decreases as the ribbon diameter increases, but the voltage proportional to this resistance value decreases. A signal P3 is generated as an IJ% diameter detection signal. These signals PI + P2 r P3 are then input to the control means shown in FIG.

FIG. 3 shows a control means for controlling the rotational direction and rotational speed of the motor 20, in which the switching signal PR is input as a set signal to one input terminal of the flip-flop 27, and the other input terminal of the flip-flop 27 receives the switching signal PR as a set signal. The switching signal P2 is inputted as a reset signal to the input terminal of. On the other hand, the voltage signal P3 is amplified by an amplifier 29. Also, the output voltage of the flip-flop 27 is V! and the output voltage (2) of the amplifier 29 are added by an adder 32, and the added signal is input to an amplifier 36 having a level shift-like function. This amplifier 36 level-shifts the output waveform of the adder 32 so that the (G) side and the ←) side are symmetrical about the O potential. Therefore, the output of the adder 32 is is shifted and amplified. The output voltage v3 from the amplifier 36 is input to the motor speed control circuit 38 as a control voltage for controlling the rotational speed of the motor 20. The motor speed control circuit 38 is generally used to rotate the motor at a constant speed, and includes amplifiers 39, 40, 41, adders 42, 43, and a through encoder 44 that detects the rotational speed of the motor 20. , and a tacho generator rake 45 that outputs a voltage signal according to the rotational speed of the motor 20. The output voltage v3 of the amplifier 36 and the output voltage of the tachogenerator 45 are input to an adder 42, and the rotational speed of the motor 20 is controlled so as to follow the change in the output of the amplifier 36.

Next, the operation will be explained with reference to the timing chart shown in FIG.

Assume that all the printed litia 10 are wound onto the spool 6 at time to, as shown in FIG. At this time, the sliding lever 17 operates one of the switches 18, and a switching signal P is generated.

Then, this signal P1 is input to the flip-flop 27, and the output voltage vl of the flip-flop 27 is maintained at a high rail (evenly).At this time, the resistance value between one end of the resistor 15 and the conductor 16 is the maximum. Therefore, the voltage signal P3 is also maximum, and therefore the output voltage V2 from the amplifier 29 is
is also maximum. Therefore, this output voltage vl and output voltage v2
are added by the adder 32 and the output thereof is level-shifted by the amplifier 36, resulting in an output voltage v3 at time t. The maximum positive value is reached at , and the motor 20 begins to rotate to the right. As a result, the rotating plate 23 rotates to the right, the idle gear 24 meshes with the stool gear 8, and the spool 5 begins to rotate to the right. Also, the movement of carrier 1 and the print head 4
The printing operation is performed continuously. The printing ribbon 10 is then wound around the spool 5, and the outer diameter of the ribbon 10 gradually increases. Along with that, ribbon 1
The outer diameter detection lever 12 pressed against the outer circumference of the spool 5
rotates outward, connecting one end of the resistor 15 and the conductor 16.
The resistance value between them gradually decreases, and therefore the voltage between them also gradually decreases. Therefore, the input voltage to the amplifier 29 (voltage signal P3) decreases, and the output voltage v2 from the amplifier 29 also decreases. Since the output voltage v1 from the flip-flop 27 is held at a constant value, the amplifier 36
The output voltage v3 from the motor 20 decreases, and the speed of the motor 20 gradually decreases. As a result, Lear J? The feed speed of the tube 10 is kept constant.

Then, at time t, the ribbon 10 is wound around the spool 5 to near the end, and the sliding lever 17 is moved from the other switch 1.
9, a switching signal P2 is generated. This signal P2 is input to the flip-flop 27, and the output voltage v1 of the flip-flop 27 is inverted to a low level (L).

At this time, the resistance value between one end of the resistor 15 and the conductor 16 is the minimum, so the voltage signal P3 is the minimum. Therefore, the output voltage v3 from the amplifier 36 does not reach the maximum negative value, and the motor 2o starts rotating to the left. As a result, the rotary plate 23 rotates to the left, the idle gear 24 meshes with the spool gear 9, and the spool 6 switches to rotate to the left. Then, the spool 6 starts winding up the print printing 10. Therefore, the outer diameter of the ribbon 1o wound around the spool 6 gradually increases, and conversely, the outer diameter of the ribbon 10 wound around the spool 5 gradually decreases. Accordingly, the outer diameter detection lever 12 rotates toward the center of the spool 5, and connects one end of the resistor 15 and the conductor 16.
The resistance value between the amplifier 29 and
The output voltage v2 of will also increase. Then, the negative value of the output voltage v3 of the amplifier 36 decreases, and the rotational speed of the motor 20, which is rotating to the left, gradually decreases. As a result, the feed speed of the sink 10 is kept constant.

As described above, according to this embodiment, the outer diameter of the sensor 10 wound around the spools 5 and 6 is detected by the outer diameter detection lever 12, and the amplifier 36 outputs the output voltage v3 corresponding to the sensor diameter to drive the motor. Since the rotation speed of the motor 20 is controlled, the rotation speed of the motor 20 is increased as the outer diameter of the ribbon 10 in the take-up spool (5 or 6) becomes smaller, and conversely, the rotation speed of the motor 20 is increased as the outer diameter of the ribbon 10 in the take-up spool (5 or 6) becomes smaller. As the outer diameter of ribbon 10 becomes larger, the rotational speed of motor 2O can be decreased, and thereby the feeding speed of ribbon 10 can always be kept constant. Therefore, especially the glue on the winding side) J
? When the spools 5 and 6 start rotating with the outer diameter of the ring 4 and 7I? It is possible to prevent a large tension from being applied to the ribbon guide 10, and to reduce the burden on the ribbon guide 11. Therefore, it is possible to prevent the ribbon 1o from being misaligned or coming off the ribbon guide 1 due to deformation of the ribbon guide 11, and damage to the ribbon 10 caused by this.

Note that in this embodiment, 1, the mechanism serving as the outer diameter detection means and other output signal generation means was provided only on one of the spools 5;
A similar effect can be obtained by removing one of the switches 18 and 19 and symmetrically providing it on the other spool 6 side. □.

In addition, in a printing machine that feeds the printing ribbon only in one direction, a switch I related to switching the feeding direction of the resen 1o is used.
B, 19, the rotating plate 23 and the flip-flop 27 are no longer necessary. In this case as well, by keeping the feeding speed of the printing ribbon 1o constant, the ribbon 1o can be used economically.

In addition, in this embodiment, the spool 6.6 is the carrier 1.
However, it may be fixedly attached to the printer body. In addition, although the outer diameter detection lever 12 was used as the outer diameter detection means in this embodiment, optical, electrical,
Magnetic detection means may also be used.

〔Effect of the invention〕

As explained above, according to the present invention, the outer diameter detection means detects the outer diameter of the ribbon wound around the spool, the output from the output means is changed according to the outer diameter of the ribbon, and the control means detects the outer diameter of the ribbon wound on the spool. By controlling the rotational speed of the spool by inputting the input to the spool, it is possible to keep the printing ribbon feeding speed constant. Therefore, it is possible to prevent the tension of the ribbon from increasing when the spool starts rotating. The ribbon guide can be prevented from being deformed due to the tension of the ribbon, and as a result, the ribbon can be prevented from shifting its position or coming off the center guide, and damage to the ribbon can be prevented. Also, always be sure to
Since lysine can be fed with a minimum pitch, ribbons can be used economically.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view showing the peripheral area of the carrier of the printing plate, Fig. 2 is also a side view,
FIG. 3 is a circuit diagram showing the control means, and FIG. 4 is a timing diagram showing the operation of the control means. 4...Print head, 5.6...Spool, 10...
・Printing d? N, 11...su7]? Guide, 12.
... Lever for outer diameter detection (outer diameter detection means), 15 ... Resistor (part of output means), 16 ... Conductor, 18.1
9...Switch, 20...Motor (driving means), 2
7...Flip-flop, 32...Adder, 36.
··amplifier. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Scope of Claims] (1) A pair of spools for winding printing resin disposed at a forward position of the printing head from both ends thereof, a driving means for rotating the spools, and a driving means for rotating the printing resin, and a driving means for winding the printing resin around at least one of the spools. outer diameter detection means for detecting the outer diameter of the zener;
An output means for changing the output according to the state of the outer diameter detection means, and a control means for changing the input of the driving means according to the output of the output means to change the rotational speed of the spool. Features of Ruri FI? 2) The outer diameter detection means is an outer diameter detection lever that is elastically pressed against the outer periphery of the printing leaden wound around at least one of the spools and moves in response to changes in the outer diameter of the printing leaden. The output means is configured so that a conductive part integrated with the outer diameter detection lever slides into contact with the resistor and outputs a voltage signal according to the resistance value between one end of the resistor and the conductive part. (3) The output means is activated when the outer diameter detection lever reaches an end of its movement range. 2. A glue feeding device according to claim (2), characterized in that it has a switch.