The specific embodiment
See also Fig. 1 and 2, heat 21 is installed in the printing 1 by hot head-supporting device (not shown), and is pressed on the cylinder 22 and is provided with, so that carry out hot stamping.Pair of frame 10 and 11 rotatably supports are for band side colour band keeper 13 and tape side colour band keeper 13a.One winding 12 is installed on the colour band keeper 13.In printing operation, the direction shown in the arrow A of colour band 12a from this winding 12 along Fig. 1 is pulled out, and is wound on the colour band keeper 13a by colour band deflector roll 33,34,35 and 36.
Be equipped with securely thereon and go up (hereinafter will describe) for the axle of band side colour band keeper 13 and be equipped with securely and supply to be with side brake drum 14 with 13 rotations of colour band keeper.Be wound on the brake drum 14 with friction surface as ribbon tension adjustment part and brake band 15 with the friction surface that is stained with the friction material such as felt on it.One end of this brake band 15 is fixed on the frame 10 by fixed head 16.This fixed head 16 is fixed on the frame 10 by the screw 16b among the elongated hole 16a that is inserted in frame 10, so that can adjust the position of fixed head 16 along the longitudinal direction of brake band 15.The other end of brake band 15 is fixed on the fixed head 23, and then this fixed head is fixed on the tension force check-out console 17, as shown in Figure 2 by axle 18 again.
Tension force check-out console 17 is pivotably mounted on the axle 19 that is fixed on the frame 10, and be pivotably mounted on the tension force check-out console 28 of axle on 56 that is fixed on the frame 11 and be connected.Tension force check-out console 17 and 28 is connected to each other by connecting plate 27.Axle 20 is fixed on frame 10 and 11, and is slidably engaged among the arcuate socket 17a that is formed in each tension force check-out console 17 and 28, so that limit the range of pivot of tension force check-out console 17 and 28.
One back-moving spring 24 is arranged on the pin 25 that is installed on the tension force check-out console 17 and is installed between the pin 26 on the frame 10, so that threaded shaft 19 promotes tension force check-out console 17 in the counterclockwise direction, thus tractive brake band 15.Colour band deflector roll 33 is bearing on tension force check-out console 17 and 28 pivotly.
The axle last (hereinafter will describe) that tape side colour band keeper 13a is installed thereon securely is equipped with the tape side brake drum 40 that rotates with colour band keeper 13a securely.The brake band 41 similar with brake band 15 is wound on the brake drum 40 with its friction surface.With the similar ground of confession band side, an end of this brake band 41 is fixed on the frame 10 by fixed head 43, and this fixed head 43 is fixed on the frame 10 by the screw in the elongated hole that is inserted in frame 10.The other end of brake band 41 is fixed on the fixed head 44, and then this fixed head is fixed on the tension force check-out console 45 by axle 46 again.
Tension force check-out console 45 is pivotably mounted on the axle 47 that is fixed on the frame 10, and is connected with another tension force check-out console (not shown) on being pivotably mounted on opposite side frame 11.Tension force check-out console 45 is connected by connecting plate 53 with another tension force check-out console on the frame 11.Axle 48 is fixed on frame 10 and 11, and is slidably engaged in the arcuate socket 49 that is formed in each tension force check-out console 45, so that limit the range of pivot of tension force check-out console 45.
One back-moving spring 50 is arranged on the pin 52 that is installed on the tension force check-out console 45 and is installed between the pin 51 on the frame 10, so that threaded shaft 47 promotes tension force check-out console 45 along clockwise direction, thus tractive brake band 41.Colour band deflector roll 36 is bearing on the tension force check-out console 45 pivotly.
Should be noted in the discussion above that brake drum 40, tension force check-out console 45 and other parts on the tape side shown in Figure 1 all are positioned at for after those parts of being with side, thereby not shown these parts among Fig. 2, and also omitted winding shown in Figure 1 12 among Fig. 2.
See also Fig. 2 and 3, driving shaft 65 is bearing in frame 10 pivotly and is used to support and drive another piece support plate (not shown) of tape side colour band keeper 13a.Colour band keeper 13a is bearing in separably by pin 68 and is fixed on the support core 67 and another root axle 65a of axle on 65.Though not shown all bolsters among Fig. 2 support in the mode identical with colour band keeper 13a for band side colour band keeper 13.
Pulley 58 is fixedly mounted on the axle 65, and is connected with another pulley (not shown) by band 57, and this another pulley is connected with the drive source that is used for cylinder 22 by one-way clutch (not shown), so that transfer a driving force to pulley 58.
See also Fig. 3 and 4, tape side brake drum 40 is installed in rotation on the flange of axle 65 and pulley 58.In this brake drum 40, be provided with the differential gearing of angular wheel.This differential gearing comprises: be installed in rotation on the axle 65 and be fixed on input angular wheel 61 on the pulley 58, be arranged on a pair of angular wheel 62 and 63 in the brake drum 40, and be fixed on output angular wheel 64 on the axle 65 by pin 66.
Be in operation, when colour band 12a for band when being sidelong pine, tension force check-out console 17 rotates along the direction a shown in the arrow B around axle 19 by spring 24.Therefore, the friction surface of brake band 15 is pressed on the brake drum 14, thereby the tension force that imposes on colour band 12a increases.
Surpass when imposing on the tension force of deflector roll 33 by back-moving spring 24 when the tension force of colour band 12a increases, tension force check-out console 17 pivots along the direction b shown in the arrow B.Therefore, the frictional resistance of 15 pairs of brake drums 14 of brake band reduces, thereby reduces to impose on the tension force of colour band 12a.
In tape side, when colour band 12a when tape side is loosened, tension force check-out console 45 rotates along the direction a shown in the arrow C around axle 47 by spring 50.Therefore, the friction surface of brake band 41 is pressed on the brake drum 40, thereby brake drum 40 is stopped.
Therefore, be passed to angular wheel 62 and 63 by pulley 58 and angular wheel 61, so that angular wheel 64 and axle 65 rotations from the power of band 57.So colour band keeper 13a rotates with coiling colour band 12a, thus the tension force of increase colour band 12a.
Surpass when imposing on the tension force of deflector roll 36 by back-moving spring 50 when the tension force of colour band 12a increases, tension force check-out console 45 pivots along the direction b shown in the arrow C.Thereby the frictional resistance of 41 pairs of brake drums 40 of brake band reduces, thereby discharges brake drum.Therefore, the rotation of angular wheel 61 is passed to brake drum 40 by angular wheel 62 and 64, so that this cylinder 40 is with angular wheel 62 and 64 rotations.Angular wheel 62 and 63 is around angular wheel 64 rotations.Therefore, axle 65 can not rotate.Thereby colour band 12a can not reeled.
So the tension force that imposes on deflector roll 36 by back-moving spring 50 equates with the tension force of colour band 12a, so just can apply constant tension force to colour band in tape side.
Fig. 5 shows the second embodiment of the present invention.Two gears 71 and 72 are installed on the frame 10 by axle 73 and 74, and are engaged with each other.Axle 75 and 76 is separately fixed on gear 71 and 72.Spring 24 and 50 is arranged between axle 75,76 and the pin 25,51.The other end of axle 75,76 engages with circular port 77 and 78 respectively.
When one of them when rotation of gear 71 and 72, spring 24 and 50 angle and length change simultaneously, thereby the tension force of colour band is changed.Axle 75 and 76 is fixed on the adjusted position separately.
Fig. 6 a and 6b show the another kind of example of the differentiator of being made up of epicyclic gearing.
Epicyclic gearing comprises and is installed in rotation on a pair of central gear 261 and two pair planetary gear 262 and 263 of axle on 265.
The rotation of axle 210 is passed to input side central gear 261 by gear 220 and 258.When brake drum 240 stopped, this rotation was passed to gear 264 by input side central gear, planetary gear 262,263 and outlet side central gear.
Fig. 7 is the stereogram of printer that is provided with the tension adjustment mechanism of third embodiment of the invention.Fig. 8 is the stereogram of this printer when printing mechanism partially opens, and Fig. 9 then is the stereogram of the printer when cover cap unloads frame.
Printer 101 comprises cylinder 111, holds hot a heat keeper 112, printing mechanism 102 and surveys paper sensor 103.Printing mechanism 102 has tape side colour band keeper 121 and for band side colour band keeper 122, these two keepers 121 and 122 all are bearing on the supporting member 135a to 135d that is fixed on the frame 133 and 134 that is positioned at cover cap 131,132.On for band side colour band keeper 122, winding 125 is installed.Power transmitting gear 124 is fixed on the end of axle of tape side colour band keeper 121, and the knob 123 that is used for manually rotating keeper 121 then is fixed on this other end, so that the colour band on the tension keeper.
As shown in Figure 8, can open printing mechanism 102 and survey paper sensor 103, so that change winding and paper.
Figure 10 and 11 shows the exploded perspective view of ribbon tension checkout gear.This ribbon tension checkout gear comprises that the tape side ribbon tension detects framework 140 and detects framework 150 for band side ribbon tension.The tape side ribbon tension detect framework 140 comprise a pair of arm spare 140a and 140b, at the connecting plate between arm spare 140a and the 140b 145 be fixed on colour band deflector roll 141 on arm spare 140a and the 140b.
The pin 143 of arm spare 140a engages rotationally with the hole 331 of frame 133, and the hole 144 of arm spare 140b is installed in rotation on the axle 332 that is fixed on the frame 134.So ribbon tension detects framework 140 and is bearing in pivotly on frame 133 and 134.Colour band deflector roll 142 passes the elongated hole 147 and 148 of arm spare 140a and 140b, and is fixed on the hole 333 and 334 of interior machined 133 and 134.
Detecting framework 150 for band side tension force comprises a pair of arm spare 150a and 150b, colour band deflector roll 155 and is fixed on connecting rod 155a on arm spare 150a and the 150b.Be formed among arm spare 150a and the 150b hole 501 and 502 respectively be fixed on frame 134 and 133 on axle 152 and 153 engage rotationally.So, detect framework 150 for band side ribbon tension and be pivotably mounted on frame 133 and 134.Being installed in axle on 152 is coil spring 151, the one end engages with the hole 503 of arm spare 150a, the other end then engages with the hole 504 of frame 134, ribbon tension detection framework 150 just can be promoted downwards by spring 151 like this, so that arm spare 150a will be pressed on the axle 154 (hereinafter will describe).
See also Figure 12 a that shows tension adjustment mechanism, comprise that the transmission mechanism of gear 612,613 and 614 is installed in rotation on the gear support plate 610 by axillare 611, so as with the power transmission of drum shaft to tension adjustment mechanism.Gear 612,613 and 614 is installed in rotation on the axle 611a that is attached to axillare 611 separately.This 611a is inserted in the elongated hole of the gear support plate 610 that is fixed on the frame 134.Tractive spring 615 is arranged between gear support plate 610 and the axillare 611, thereby promotes axillare 611 downwards.Therefore, even gear 612 impinges upon on the tooth of gear of drum shaft not with its engagement, axillare 611 deflection that also can not make progress.Thereby, can prevent gear breaking.Axle 620 and 630 is rotatably supported on the double-walled 134a and 134b of frame 134.
Gear 621 is fixedly mounted on the axle 620, and a reverse gear 622 also is installed on this axle 620, is equipped with a reverse one-way clutch 623 therebetween.
One friction clutch F is arranged on the axle 630.This friction clutch F comprises: brake drum 634, be inserted in the spring 635 in this brake drum 634, be fixed on the axle 630 so that spring 635 axially is pressed into pressure plare 636 in the brake drum 634, be installed in rotation on the friction plate 633 on the axle 630, and be installed in rotation on the free gear 632 on the axle 630.Brake drum 634 by its terminal be formed on axle 630 on the pin 640 that engages slidably of axial groove be connected on spools 630 so that this cylinder 634 can rotate together with the axis, and can be by spring 635 axial push.So cylinder 634 promotes friction plate 633, so that this friction plate is pressed on the side of gear 632.Gear 631 is installed on the axle 630 by an one-way clutch 638, and this clutch only is passed to gear 631 around direction of rotation with rotary power along the ribbon spool of axle 630.This gear 631 is meshed with the gear 124 (Fig. 7) of colour band keeper 121.
Gear 632 is meshed with being fixed on the gear 621 of axle on 620, and gear 631 is meshed with a reverse gear that is installed on spools 620 by reverse one-way clutch 623.Therefore, the power that is used for head roll 111 is passed to gear 632 by gear 621, and is passed to axle 630 by the brake drum 634 that is inserted with the friction plate 633 that places therebetween.The rotation of axle 630 makes gear 631 rotate by one-way clutch 638, so that 121 rotations of colour band keeper, thereby the coiling colour band.
The brake band 650 made by the friction material such as felt contacts with brake drum 634, so that apply frictional force to this cylinder.A wherein end of this brake band 650 is connected with frame 134 by fixed head 652, and its other end then is connected on the portable plate 651 that is slidably mounted on the 651a.This 651a is connected on the hole 149b of a band support brace 149.This band support brace 149 is installed in rotation on the axle 332 in hole 149a place.This 332 supports arm spare 140a and the 140b that ribbon tension detects framework 140 as mentioned above.Ribbon tension detects framework 140 and band support brace 149 and is connected to each other by the pin 146 that is fixed on arm spare 140b and goes up and engage with the hole 160 of plate 149, as shown in figure 13.One end of this pin 146 engages (Fig. 7) slidably with the elongated hole 335 of frame 134.So band support brace 149 detects framework 140 by ribbon tension and rotates.
See also Figure 12 a and 13, a hook portion 655 of back-moving spring 654 is suspended on the hook portion 658 of band support brace 149, and its another hook portion 657 is connected on the frame 134, detects framework 140 and band support brace 149 so that push ribbon tension in the counterclockwise direction around axle 332.
See also Figure 13, by deflector roll 155, lead angle G and deflector roll 141 and 142, and be wound on the colour band keeper 121 from the colour band 125a of winding 125.
When the tension force of colour band 125a increases, ribbon tension detect framework 140 and by pin 146 be connected on this framework 140 band support brace 149 around axle 332 along clockwise direction a rotate.The rotation of this plate 149 makes and to be fixed on the axle 651a on this plate and the band plate 651 that engages with this 651a moves along direction b shown in Figure 13.Therefore, the band that is connected with band plate 651 650 is by along direction b tractive, so that the tension force of band 650 increases, thereby increases frictional force between this band and the brake drum 634.So this brake drum 634 is braked, thereby reduce the winding tension of colour band 125a.
Therefore, when the tension force of colour band becomes when being higher than predetermined value, brake band 650 is pulled, so that increase the frictional force between this band and the brake drum 634, thereby reduces the power to colour band keeper 121.When ribbon tension became predetermined value, brake band 650 loosened, so that increase the power of giving colour band keeper 121.So the tension force of colour band remains unchanged.
When cylinder 111 for laggard when giving reverse rotation, gear 631 is by reverse one-way clutch 623 reverse rotations, thereby the colour band on the colour band keeper 121 is pulled out.Operate for laggard giving,, so also can control ribbon tension laggard giving in the operation for axle 620 is provided with a laggard tenslator of giving.
Figure 14 shows the details of portable plate 651.Spring 173 is installed in penetrating shaft 651a and encircles on the axle 171 that is fixed on the portable plate 651 by a pair of E shape.
When band 650 during by fierce tractive, portable plate 651 moves up.Therefore, can prevent this strip breaks.
With reference to Figure 11-13 tension adjustment mechanism of using for the band side is described below.
Band support brace 521 is rotatably supported on the frame 134 by axle 152 (Figure 11 and 12b).See also Figure 12 b, this band support brace 521 comprises outer side frame 521b and interior side frame 521a, and pushes in the counterclockwise direction by spring 156.As mentioned above, being connected with the axle 154 that ribbon tension detects the arm spare 150a of framework 150 on it is fixedly mounted on the band support brace 521.
Have the axle 662 that is fixed thereon for band side brake drum 661, and be rotatably supported on the frame 134 by this axle 662.One brake band 660 is installed on the brake drum 661.One end of this brake band 660 is fixed on the plate 665 that is fixed on the frame 134, and its other end engages with axle 154.
Band support brace 521 pushes along the counter clockwise direction shown in Figure 13 by spring, thereby applies tension force to brake band 660.Band edge detecting sensor 666 is installed on the frame 134, so that detect the end of colour band 125a.
Axle 662 the gear 661a that is fixed on the brake drum 661 is meshed with gear 663 on the 664a who is installed in swivel plate 664.This gear 663 is meshed with the gear 122a (Fig. 7) of colour band keeper 122, so that the rotation of this keeper can be passed to brake drum 661.
Be installed in the bar 667 on the swivel plate 664, as shown in figure 10, contact slidably, so that this bar and therefore swivel plate 664 rotatable 90 degree, thereby change the position of gear 663 with semicircular guiding groove 667a.
For printer is provided with outside winding roll film and inboard winding roll film.In Figure 13, " outward " is meant outside winding, and " interior " then is meant inboard winding.If the kind of winding changes, then the direction of transfer of revolving force also changes.By change the position of gear 663 with bar 667, can prevent that the gear 122a of keeper 122 and gear 663 break away from.
As previously mentioned, ribbon tension detection framework 150 contacts with axle 154 by spring 151 upwards pushes.
When the tension force of colour band 125a increases, ribbon tension detect framework 150 and be connected on this framework 150 band support brace 521 around axle 152 and 153 along clockwise direction c (Figure 13) rotate.The rotation of this plate 521 makes axle 154 move along direction d shown in Figure 13.Therefore, band 660 is loosened, thereby reduces the load on the brake drum 661, so that reduce the winding tension of colour band 125a.
According to the present invention, even the diameter of winding changes, the tension force of colour band also remains unchanged.
Though in conjunction with preferable specific embodiment of the present invention it is described, it being understood that this description just makes example explanation usefulness, and be not used for limiting the scope of the invention that scope of the present invention should be limited by following claim.