JPS6017716B2 - Ribbon feed direction switching device for label printers, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an IJ ribbon feed direction switching device for a label printer, etc., which can apply tension to printing ribbons in the front and rear stages of a printing section in one motion, and further includes: The purpose of this invention is to use an IJ bong feeding direction switching device for a label printer or the like, which has a very simple structure that changes the printing ribbon feeding direction by increasing the tension of the printing ribbon.

In this invention, one spool is driven and the printing ribbon is drawn out from the other spool to the printing section while being wound up, and one tension lever is positioned at the front and rear stages of the printing section to bend the path of the printing ribbon. Provide multiple contacts,
Therefore, by one motion of biasing the tension lever in one direction, it is possible to simultaneously apply tension to the printing ribbons in the front and rear stages of the printing section, and furthermore, by increasing the tension of the printing ribbon, the tension lever is actuated, The operation of the tension lever is directly detected by a detector, and the reversing mechanism is reversed based on this detection signal to switch the feeding direction of the printing ribbon, so that the structure can be simplified.

An embodiment of the invention will be described with reference to the drawings.

Reference numeral 1 denotes a main body, and the main body 1 is provided with a front panel 2 on which various operation parts are mounted and a transparent cover 3.

On a horizontal cover frame 4 covered with this transparent cover 3, there is a label holder 7 for winding a long mount 6 on which labels 5 are pasted at equal pitches, and a plate for peeling the labels 5 from the mount 6. A separator 8 having a shape, a label presser 9, a feed roller 10 and a bush roller 11 made of rubber, and a mount guide 12 are provided.
3, a pair of spools 15 and 16 for winding both ends of the printing ribbon 14, and a label detector 17 for photoelectrically detecting the label 5 peeled off by the separator 8. Next, a plate-shaped mechanism frame 18 is fixed to the lower surface of the cover frame 4, and as shown in FIGS. The rotational force of the motor 19 is applied to the spool 15''.
16 is supported. This reversing mechanism 20 includes the motor 19 and this motor 20.
The gear 121 directly connected to the motor 20, the reversing lever 22 held on the rotating shaft of the motor 20, the two large and small gears 23 and 24 held coaxially with the reversing lever 22, and the spools 15 and 16. Coaxially connected gears 25, 2
6 and more. Gears 22 and 23 are always meshed, and gear 2
4 is engaged with either one of the gears 25 and 26. Further, a stopper 27 for regulating the rotation range of the reversing lever 22 is formed on the mechanism frame 18. The motor 19 is held by a plate-shaped motor frame 28 fixed to the mechanism frame 18. The printing ribbon 14 is fixed to the front surface of the printing head 13 or pulled out from the spools 15 and 16 toward a bong guide 29. Further, the mechanism frame 18 includes a third
As shown in Figures 6 and 7, the tension lever 30
is held slidably while being biased in one direction by a spring 31, and this tension lever 3
Four guide rollers 32 are held on both sides of the cover frame 4 and project upward from the cover frame 4.

The tension lever 30 is provided with two tension rollers 34 that are contacts that protrude upward from a long hole 33 formed in the cover frame 4. These tension rollers 34 apply tension by bending the print ribbon 14 at the front and rear stages of the print head 13 . Further, the tension lever 30' has a long hole 36 through which a guide column 35 erected from the mechanism frame 18 projects, and the spring 31
Movement in the direction biased by is restricted. Further, a detector 37 that directly detects the movement of the tension lever 30 and issues an electric signal to the motor 19 is supported by the mechanism frame 18. As shown in FIGS. 8 and 9, the label presser 9 has elongated holes 40 and 41 that are slidably held by guide pins 38 and 39 provided upright on the mechanism frame 18, and a hole that extends from the cover frame 4. It has a sled-shaped label pressing piece 42 that projects upward, a handle 44 that projects from a window 43 formed in the cover frame 4, and three protrusions 45 that are joined to the mechanism frame 18.

In addition, a stopper hole 46 is formed in the label presser 9, which is continuous with the side edge of one of the elongated holes 41. Such a label presser 9 is normally urged by a spring 47 and joined to the separator 8. The stopper hole 4
One end of the elongated hole 41 is closer to the eight separator legs than one end of the elongated hole 41. As shown in FIG. 10, the edge of the separator 8 is formed with a bent portion 48 that is bent at an acute angle, and an arcuate surface 49 with a radius of curvature of 4 mm is formed at the corner of this bent portion 48. .

This arc surface 49 bends the mount 6 while bringing the entire surface of the mount 6 into close contact with the separator 8. Therefore, as shown in FIG. Even if the edge 51 is formed at the rear end of the separator 9, the entire surface of the mount 6 can be bent so as to be in close contact with the separator 9. Figure 12 and 1
As shown in FIG. 3, the push roller 11 is attached to the support plate 5.
2 and protrudes upward from the cover frame 4.

The support plate 52 has elongated holes 55 and 56 from which guide pins 53 and 54 erected on the mechanism frame 18 project, a handle portion 58 that projects from a window 57 formed in the cover frame 4, and a handle portion 58 that is connected to the mechanism frame 18. Three protrusions 59
It has Further, the elongated holes 55 and 56 are formed obliquely in a direction away from the feed roller 10 as they go in the drawing direction of the mount 6, and two locking recesses 60 are formed on the right side edge of one of the elongated holes 56. 61 is formed. The rear portion of the support plate 52 is urged toward the feed roller 10 by a spring 62, and is also urged toward the rear left by a spring 63. As shown in FIGS. 14 and 15, the mount guide 12 consists of opposing plates 64 and 65. One plate 64 is curved so as to run around the outer periphery of the push roller 10, and has an edge at its end. A mount prevention piece 66 is formed to protrude into an annular groove formed on the outer periphery of the feed roller 10 to reliably guide the mount 6 to the mount guide 12.

Further, a mirror-toothed blade 67 is formed at the other end of the plates 64, 65. The feed roller 10 is driven by a motor 6 supported by the mechanism frame 18 as shown in FIG.
It is connected to 8.

This feed roller 101 is the mount prevention piece 66.
An annular groove 69 that protrudes and a flange 70 that faces the cover frame 4 and guides the side green of the mount 6 are formed. In such a configuration, the backing paper 6 is pulled out to the front of the print head 13 by intermittently rotating the feed roller 10, predetermined content is printed on the label 5, and the backing paper 6 is pulled out by the separator 8 due to the competing pull-out operations. Since the label 5 is fed while being bent, the label 5 is peeled off from the mount 6.

Further, the printing ribbon 14 travels by driving a motor 19. That is, as shown in FIGS. 3 and 4, when the gears 24 and 25 are engaged with each other and the motor 19 is rotated counterclockwise (in the direction of the solid line arrow in FIG. 4), the spool 15 connected to the gear 25 is moved from the other When the printing ribbon 14 is wound up from the spool 16 and the motor 19 is rotated clockwise (in the direction of the dotted line arrow in FIG. 4) from this state, the gear 2
1 to the gear 23, the reversing lever 22 rotates clockwise, and the gear 24 meshes with the other gear 26.
The spool 6 winds up the printing ribbon 14 from the spool 15 side. During this time, tension is applied to the print ribbon 14 simultaneously by tension rollers 34 at the front stage and the rear stage of the print head 13. When one spool 15 or 16 finishes winding up the printing ribbon 14, the tension acting on the printing ribbon 14 increases, and the tension lever 30 moves the spring 31
When it slides against the force and moves with a stroke a shown in FIG. 6, the detector 37 detects this movement and generates an electric signal. The tension lever 3 moves with a stroke of b, but in this state, the printing ribbon 14 has been bent by the tension roller 34 and the margin that existed is gone, and this margin is used to hold the label 5 in one place. The setting is sufficiently larger than 1/4 of the amount to be fed by one sheet. As shown in FIG. 17, printing and issuing on the label 5 are performed at timing A, and the label detector 17 operates at timing D accordingly. As described above, when the tension lever 30 moves with a stroke a, the detector 37 issues an electric signal at a timing C to prompt the motor 19 of the reversing mechanism 20 to complete reversing preparations, and the motor 19 indicates that the label 5 is being issued. If so, it is reversed at timing B at the same time as the issuance is completed, and the reversing lever 22 is rotated together with the gears 23 and 24 to mesh the gear 24 with the gear 25 or 26 connected to the spool 15 or 16 to be driven. In this way, printing and issuing of the label 5 are prohibited while the feeding direction of the printing ribbon 14 is being switched over a certain period of time, and printing and issuing of the label 5 are prohibited when the switching of the feeding direction is completed. It will be restarted. In this way, since the printing ribbon 14 is always fed during printing and issuing of the label 5, the printing state has no difference in shading and the clarity is uniform.

Furthermore, the feeding direction of the printing ribbon 14 is not changed instantaneously, but is carried out over a certain period of time by reversing the motor 19 and rotating the reversing lever 22, thereby reducing the slack in the printing ribbon 14 during cutting. It is possible to prevent deviation from the route.
Further, tension is applied to the printing ribbon 14 at the front stage (rewinding side) and the rear stage (winding side) of the printing pad 13, and this action is achieved by one motion of moving one tension bar 30 in one direction. Furthermore, since the sliding movement of the tension lever 30 is directly detected by the detector 37 and the reversing mechanism 20 is caused to perform the reversing operation, the structure is simple and there are few failures. As shown by the imaginary lines in FIG. 8, hold the handle part 44 and press the label presser
Now, by engaging the guide pin 41 with the stopper hole 46 and maintaining this state, it is possible to easily set the mount 6. Each spring 47 has the function of resiliently engaging the guide pin 41 and the stopper 46, and urging the label presser 9 to resiliently press the label 5. The punching protrusion 45 is located at the vertex of the triangle and is stably joined to the mechanism frame 18 with a small coefficient of friction, so that the label pressing piece 42 can press the label 5 on average. Similarly, when setting the mount 6 between the feed roller 10 and the push loaf 11,... By deflecting the support plate 52 as shown by the phantom line in FIG. 12, and engaging the guide pin 54 with the stopper recess 60 to maintain the push roller 11 in a state away from the feed roller 10, it is possible to easily Can work.

This support plate 52 also has a protrusion 59 disposed at the apex of the triangle.
As a result, the push roller 11 is joined to the feed roller 10 with the vertical axis without uneven contact. Furthermore, as shown in FIG. 16, the mount 6 can be guided by the cover frame 4 and the flange 70 to prevent the mount 6 from meandering. Further, the mount 6 pulled out from the mount guide 12 can be cut by the blade 67 even if it is bent in either the left or right direction, as shown in FIG. Furthermore, although it has been conventionally done to peel off the label 5 by bending the mount 6 with the separator 8, the conventional plate-shaped separator has the green edge cut off, and the edge The mount 6 is bent by holding it.

For this reason, the bent portion of the mount 6 partially floats from the edge of the separator, vibrates when the mount 6 is pulled out, and is thereby struck by the print ribbon 14, causing the label 5 to become dirty or make noise. However, according to the merits, mount 6 is the first
Since the arc surface 49 shown in FIG. 0 or the arc surface 501 shown in FIG. In addition, since the overall structure is arranged centrally on the flat mechanism frame 18, comprehensive adjustment is easy and all operations can be easily confirmed.

In this invention, a plurality of contacts for bending the path of the printing ribbon are provided on one tension lever that is biased in one direction and supported so as to be slidable as described above, and are positioned at the front and rear stages of the printing section. As a result, tension can be applied to the take-up side and the tassel side of the printing ribbon simultaneously with one motion of one tension lever.Furthermore, the tension lever is actuated by increasing the tension of the printing ribbon, and this The movement is directly detected by a detector, and the detection signal can be used to reverse the reversing mechanism to switch the feeding direction of the print ribbon. Therefore, the structure can be extremely simplified.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a scaled-down plan view, FIG. 2 is a partially cutaway, scaled-down front view, and FIG.
Fig. 3 is a plan view showing the main parts, Fig. 4 is an enlarged plan view of the reversing mechanism, Fig. 5 is an enlarged vertical side view thereof, Fig. 6 is an enlarged plan view of the tension lever, and Fig. 7 is an enlarged plan view of the reversing mechanism. FIG. 8 is a plan view showing the operation of the label presser; FIG. 9 is a longitudinal side view showing the support state of the label presser; FIGS. 10 and 11 are A plan view showing a part of the separator, FIG. 12 is an enlarged plan view showing the support structure of the push roller, FIG. 13 is a vertical side view thereof, and FIG. 14 is a plan view showing the mount guide, push roller, and feed roller. Enlarged plan view, No. 15
The figure is an enlarged side view of the mount guide, FIG. 16 is a partially cutaway side view of the push roller and feed roller, and FIG. 17 is a timing chart. DESCRIPTION OF SYMBOLS 13... Print head (printing part), 14... Print ribbon, 15-16... Spool, 19... Motor (drive part), 20... Reversing mechanism, 30... Tension lever, 34... ...Tension roller (contact), 37...
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Claims (1)

[Claims] 1 A pair of spools are provided that wind and hold both ends of the printing ribbon pulled out to the printing section, and a reversing mechanism is provided that alternately transmits the rotational force of the drive section to these spools, and the ribbon is supported so that it can slide freely while being biased in one direction. The tension lever is provided with a plurality of contacts positioned before and after the printing section to bend the path of the printing ribbon by movement of the tension lever in the direction in which the tension lever is biased. 1. A ribbon feeding direction switching device for a label printer or the like, characterized in that a detector is provided for directly detecting an operation opposite to the direction in which the lever is energized and emitting an electric signal to the reversing mechanism.