CN1069585C

CN1069585C - printer

Info

Publication number: CN1069585C
Application number: CN 97102372
Authority: CN
Inventors: 宗形努; 阪苍重喜
Original assignee: Fujitsu Esotec Co ltd; Fujitsu Ltd
Current assignee: Fujitsu Esotec Co ltd; Fujitsu Ltd
Priority date: 1996-01-30
Filing date: 1997-01-29
Publication date: 2001-08-15
Anticipated expiration: 2017-01-29
Also published as: JP3449851B2; JPH09202017A; CN1163828A

Abstract

The present invention relates to a printer with a mechanism capable of automatically adapting to the thickness of the paper to be printed. The printer includes a platen and a printing head installed on the carriage, and the paper guide mechanism installed on the carriage is pressed against the printed paper under the weight of the printing head and the action of the spring, so that it can follow the It moves according to the thickness of the paper to maintain a certain gap between the print head and the paper. The carriage is rotatably and axially movable supported by a fixed shaft extending parallel to the platen, and an upper slide guide is disposed parallel to the platen to guide the upper slide portion of the carriage. The upper slide guide is spring biased and a stop guide is provided on the opposite side of the upper slide guide from the platen.

Description

Printer

The present invention relates to a kind of being suitable for the printer on the printed medium that the information as the literal prints to that sensitive paper is opened, the scraps of paper or bank book are so particularly, be the present invention relates to a kind of printer with mechanism of the thickness that can adapt to printed medium automatically.

In recent years, wish to have a kind of being suitable for the cheap printer on the printed medium that the information as the literal prints to that sensitive paper is opened, the scraps of paper or bank book are such.Like this, just need a kind of printer, it has a mechanism that can automatically adapt to the thickness of printed medium, and this mechanism can mechanically adapt to the varied in thickness of printed medium and not adopt electric member expensive as motor and sensor.

Printer has a printhead and a platen relative with printhead, and printing is undertaken by printhead when printed medium is passed in gap between printhead and the platen.Preferably, even when the thickness of printed medium changes, certain clearance is arranged still between printhead and printed medium.If the gap between printhead and the platen is constant, then when the thickness of printed medium changed, the gap between printhead and the printed medium will change.Therefore, printhead preferably can adapt to the variation of printed medium thickness.

The thickness of printed medium is sometimes because adopt the paper of many types to change as printed medium.For example, the single-sheet stationery and the scraps of paper can be used as printed medium.The scraps of paper comprise a plurality of ply of papers, and wherein at least one is plating carbon-coating or impact paper.In printer, the shape of the used scraps of paper is continuous type (a kind of continuous paper that has feed hole on its side also can be continuous paper or continuous stationery).In addition, bank book also can be used as printed medium.Abbreviate these various printed mediums as paper below.The thickness of single-sheet stationery is different with the thickness of continuous stationery, and when printer was designed to be common to single-sheet stationery and continuous stationery, paper thickness will change.In addition, when adopting bank book, because the page of the bank book that is printed changes, paper thickness also can change.

In traditional printer, be used for according to motor from signal of sensor mobile print head by adopting a sensor and that is used to detect the absolute altitude of paper surface.Make the gap between printhead and the platen be subjected to Electronic Control, so that between printhead and printed medium, keep certain clearance.Sensor and motor all are expensive members, therefore just produce such problem, become expensive even have the printer of the mechanism that automatically adapts to paper sheet thickness.In addition, when adopting sensor and motor, therefore the control printhead of need taking time is affected the throughput of printer.Also have, when on the paper that changes is largely arranged with number of pages at a kind of its paper sheet thickness as bank book, printing operation, must when each page changes, detect the surperficial absolute altitude of bank book, and the control system of a complexity is provided with sensor.

The purpose of this invention is to provide a kind of printer that can automatically adapt to the mechanism of paper sheet thickness that has, this printer low price, and can reduce thus and adapt to the required time of paper sheet thickness.

According to the present invention, a kind of printer is provided, it comprises a shell, a platen, axle, a balladeur train, a printhead, a feeder and a paper guide of fixing, and wherein said fixing axle is parallel to platen to be arranged, is positioned at the top of platen obliquely; Balladeur train rotatably also can be supported by fixing axle with moving axially; Printhead is fixed on the balladeur train and is arranged in the top of platen, and is relative with it; Between the paper input platen and printhead that feeder is used for desiring to be printed; Paper guide is fixed on the balladeur train, so that paper guide is to be crushed on the paper surface under the effect of the weight of printhead at least, and can move along with the variation of paper sheet thickness, thereby keeps certain clearance between printhead and paper.

Best, balladeur train has a upper slide part that is positioned at the top of fixing axle, and have one be parallel in shell that platen arranges on slide guide device, be used to guide the upper slide part, should go up that slide guide device can move and with at least one spring bias voltage, so that paper guide can be crushed on the surface of paper under the effect of the weight of printhead and at least one spring.

Best, last slide guide device comprises that one is parallel to the guide rail that platen extends, the arm that links to each other with any end of guide rail with several and stretch out perpendicular to platen, and guide rail and arm are made an integral body with metallic plate, and arm can be around a pivot swinging.

Best, last slide guide device has one to be used to increase inertia, with the pouring weight of the reaction force of opposing printhead in printing.

Best, paper guide has a wear plate fixed thereon, wear plate directly contacts with paper surface like this, in shell, be provided with a restraint guide rail, it is arranged in the opposite side of the last slide guide device that leaves balladeur train, with antagonism is that balladeur train is accepted in the effect of weight of printhead at least, thereby prevents that wear plate from directly contacting with the surface of platen when not having paper on platen.

Best, platen is columniform, and wear plate have one with the corresponding fluted column shape of the cylindrical surface surface of platen, to reduce local contact force with respect to platen.

Best, feeder comprises that one is arranged on first feed rolls on platen one side of leaving platen, with second feed rolls that is arranged on the opposite side of the platen that leaves platen, first and second feed rolls can be along first direction of rotation and the second direction of rotation rotation opposite with first direction of rotation, paper can be delivered on the platen from a side of platen like this, and paper also can be delivered on the platen from the opposite side of platen simultaneously.

Best, one first fastener is set, in order to platen to be set in shell; One second fastener is set, the first tractor feed device to be set in platen one side of leaving platen in shell; One the 3rd fastener is set, the first single-sheet stationery feeder to be set in platen one side of leaving platen in shell; One the 4th fastener is set, with the couple positioned opposite second tractor feed device at the platen that leaves platen in shell; One the 5th fastener is set, with the couple positioned opposite second single-sheet stationery feeder at the platen that leaves platen in shell.In the case, the first tractor feed device, the second tractor feed device, the first single-sheet stationery feeder and the second single-sheet stationery feeder can be arranged in the shell selectively, and tractor feed device and the single-sheet stationery feeder at least one be supplied with and be selected to paper can from platen.

Best, the second tractor feed device will so be arranged, so that platen directly is sent to from the second tractor feed device in the gap that continuous stationery can pass between second feed rolls and the platen.

Single-sheet stationery, continuous stationery, comprise a plurality of layers paper and any paper that is printed that all can be used as in the bank book.

The present invention can be better understood from the following explanation that the reference accompanying drawing carries out preferred embodiment, and these accompanying drawings are:

Fig. 1 is the simple partial view of printer shown in Figure 2;

Fig. 2 is the side sectional view according to the printer of embodiments of the invention;

Fig. 3 is the plane of printer shown in Figure 2;

Fig. 4 is a view, shows the fastener that is used for being provided with at the shell of printer shown in Fig. 1 to 3 single-sheet stationery feeder and tractor feed device;

Fig. 5 is the schematic sectional view of the improvement example of printer shown in Figure 4;

Fig. 6 is the schematic sectional view of the improvement example of printer shown in Figure 4;

Fig. 7 is the schematic sectional view of the improvement example of printer shown in Figure 4;

Fig. 8 is the schematic sectional view of the improvement example of printer shown in Figure 4;

Fig. 9 is the schematic sectional view of the improvement example of printer shown in Figure 4;

Figure 10 is the schematic sectional view of the improvement example of printer shown in Figure 4;

Figure 11 is the schematic diagram of well-equipped printer, shows the paper feed direction;

Figure 12 is a view of delivering to the paper of platen, and it illustrates, and the direction of the literal of printing is determined according to the paper feed direction;

Figure 13 is the view of preceding madial wall with shell of the gathering sill that is used for fixing platen;

Figure 14 is the view similar to Figure 13, and it shows the platen that is in obliquity;

Figure 15 is the platen and the leading side view to device that can move with platen;

Figure 16 is the view similar to Figure 15, and it shows be in vertical position leading to device; And

Figure 17 is the view similar to Fig. 1, shows the printer according to another embodiment of the present invention.

Fig. 1 to Fig. 3 shows the printer 100 according to one embodiment of the present of invention.As shown in Figure 2, printer 100 has a shell with protecgulum 102, and this protecgulum is the part of shell 101.Fig. 1 shows the main element of the printer 100 that is arranged in the shell 101, and wherein, label 1 is represented platen, the paper that 2 representatives will be printed, 3,4,5 and 6 represent feed rolls, and 11 represent a fixing axle, 12 represent balladeur train, and 12a represents the upper slide part, and 13 represent printhead, 14 represent paper guide, slide guide device is gone up in 15 representatives, and 16 represent pouring weight, and 17 represent spring, 18 represent spring support, and 19 represent a restraint guide rail.

Paper 2 is the printed mediums that will print, it for example in the direction of arrow A by

feed rolls

3,4,5 and 6 and platen 1 carry, when paper 2 is carried through the gap 1a between printhead 13 and platen 1, print operation with printhead 13.

Balladeur train 12 rotatably also can be supported by fixing axle 11 with moving axially, and axle 11 is parallel to platen 1 to be arranged, is positioned at the top of platen 1 obliquely, and along the rear of sheet transport direction A at gap 1a.Balladeur train 12 is laterally moved by the driving mechanism that comprises motor.

Printhead 13 is fixed on the balladeur train 12 firmly, and is arranged on the top of platen 1, and is relative with platen 1.Therefore, printhead 13 can be along laterally moving with balladeur train 12 with respect to paper 2, and print operation with printhead 13.Printhead 13 is impact type point type printing types, and 24 pin (not shown) are arranged, and pin is driven by known piezo actuator (not shown).

Balladeur train 12 is made a double-arm lever, and one of them arm tilts down to stretch out from fixing axle 11, and is loaded with printhead 13.Another arm of balladeur train 12 extends upward from fixing axle 11, is provided with upper slide part 12a in the upper end of the upwardly extending arm of balladeur train 12.Also be provided with slide guide device 15, be used to guide upper slide part 12a.Last slide guide device 15 can be parallel to the pivot 15c swing of fixing axle 11 and by spring 17 bias voltages, 12a contacts with the upper slide part around one.

Last slide guide device 15 is the shape of alphabetical π and comprises that one is parallel to the guide rail 15b of the band knuckle that platen 1 extends, with the arm 15a that links to each other with arbitrary end of guide rail and stretch out perpendicular to platen 1.Guide rail 15b and arm 15a integrally form with a metallic plate, and arm 15a is contained on the pivot 15c swingably.Spring 17 links to each other with arm 15a in the place near guide rail 15b, and the other end of spring 17 then links to each other with spring support 18, and this support is fixed on the framework of printer 100.Regulating spring support 18, the elastic force of just possible regulating spring 17.

Like this, last slide guide device 15 is just biased, thus along the clockwise direction among Fig. 1 around pivot 15c swing, guide rail 15b then with the relation of fixing axle 11 keeping parallelisms, this is because the elastic force of spring 17 is passed on the guide rail 15b equably by the arm 15a on arbitrary end of guide rail 15b.Therefore, although balladeur train laterally moves, last slide guide device 15 also can promote balladeur train 12 equably.

Therefore, because the effect of the weight of printhead 13 and spring 17 are passed to the effect of the elastic force of balladeur train 12 by last slide guide device 15, printhead 13 has the trend that moves down.

Paper guide 14 is fixed on the balladeur train 12 in the installation site of printhead, so that the paper 2 of Shu Songing can import among the gap 1a between platen 1 and printhead 13 smoothly in the direction of arrow A.Paper guide 14 is pressed on the surface of paper 2 under the effect of the elastic force of the weight of printhead 13 and spring 17, and can be along with the variation of the thickness of paper 2 and move, to keep certain clearance between the surface of printhead 13 and paper 2.

Paper guide 14 has a wear plate 14a fixed thereon, and wear plate 14a directly contacts with the surface of paper 2 like this.Position between the wear plate 14a of printhead 13 and paper guide 14 relation is so definite, so that when wear plate 14a is pressed on the surface of paper 2, between the surface of printhead 13 and paper 2 certain clearance is arranged.Therefore, even the varied in thickness of paper 2 still guarantees to have certain clearance between the surface of printhead 13 and paper 2.

Be preferably made the recessed cylindrical surface corresponding with the lower surface of the wear plate 14a of paper 2 contact, so that disperse the contact pressure with respect to paper 2 with the cylindrical surface of platen 1.Therefore, when paper 2 comprises a plurality of pressure-sensitive ply of paper, just might avoid in second layer impact paper, producing the vestige that causes by the pressure of wear plate 14a.

The guide rail 15b that pouring weight 16 is arranged on the band knuckle of slide guide device 15 upward and along the guide rail 15b that is with knuckle laterally extends, to strengthen inertia, thereby the reaction force that opposing is produced by printhead 13 in printing prevents that thus printhead 13 from moving apart paper 2.

In shell 101, the opposite side of slide guide device 15 on the upper slide part 12a that leaves balladeur train 12, be provided with the restraint guide rail 19 that is parallel to fixing axle 11, when on platen 1, not having paper, the effect of weight of opposing printhead 13 and the elastic force of spring 17 and accept balladeur train 12 prevent wear plate 14a and directly contact with having the material of low-friction coefficient such as the surperficial of platen 1 that rubber is made.Compare with the stop mechanism of retainer on containing arbitrary end of being arranged to lean against slide guide device 15, restraint guide rail 19 is more favourable, this is because restraint guide rail 19 is not subjected to the influence of the precision of slide guide device 15, can adopt the part of making by general precision.

When printer operation, if there is not paper 2 on platen 1, then the upper slide part 12a of balladeur train 12 leans against on the restraint guide rail 19, and guarantees to have between printhead 13 and platen 1 gap of a minimum.Printer 100 just is in stand-by state now, does not need as necessary in conventional printer, makes printhead 13 move apart platen 1.Like this, just can be under this state feeding paper 2.

When paper 2 in the direction of arrow A during feeding, paper 2 is inserted among the gap 1a between the wear plate 14a of platen 1 and paper guide 14, and the leading edge of paper 2 is then led by the arc end 14b of the cylindrical and paper guide 14 of the platen 1 of rotation.Paper guide 14 is along with the thickness of paper 2 moves up with printhead 13 instantaneously, thereby guarantees between the surface of printhead 13 and paper 2 certain clearance is arranged, and available printhead prints operation, reaches higher throughput.In addition, if the thickness of paper 2 changes when paper 2 is printed, with regard to the adjusting of the height that automatically carries out paper guide 14 and printhead 13.Even at paper 2 is that the broken line place has under the situation of bank book of a step therebetween, also can do like this, do not need to detect the thickness of paper 2 or the number of pages of bank book with sensor, do not need to be provided with complicated control system yet.In addition, printer has a magnetic reading head and to write the magnetic head (not shown), to read and to write the magnetic data of bank book.

Therefore, according to the present invention, can obtain a kind of printer that can automatically adapt to the mechanism of paper sheet thickness that has, its low price and can reduce thus and adapt to the required time of paper sheet thickness does not need the electrical equipment of the such costliness of image-position sensor, motor or magnetic force actuator simultaneously.

With reference to the figure 1 described member, other member of printer 100 is shown in Fig. 2 and 3 except top.Following front guide 7 is wherein arranged, go up front guide 8, go up back guide 9 and following back guide 10, the paper 2 that they are used for moving leads and diversion platens 1.Be provided with one in the place ahead of shell 101 and be used for the platen 21 that paper 2 is placed thereon, flipper guide 22 links to each other with platen 21 with upper guide plate 23, to form the paper inlet.Be provided with a sensor 24 that is used to detect the insertion of paper 2, it starts feed rolls 3 to 6 when the signal that obtains from sensor 24, also is provided with a sensor 25 that is used to detect the leading edge of paper, the last clear area of the paper 2 that is printed with the location.Be provided with a driving-belt 26 and stepping motor 27, be used to make balladeur train 12 to move back and forth, thereby printhead 13 is moved along fixing axle 11.Above printhead 13, the drive unit 29 of ribbon cartridge 28 and colour band is contained on the balladeur train 12 so that have the annular colour band of China ink can be below the lower edge of printhead 13 supply and passing through.Side frame member 103 is shown among Fig. 3.

Be provided with guard shield 28a in the lower end of ribbon cartridge 28, contact the leading edge of paper 2 and prevent that paper 2 from being had the colour band of China ink to make dirty with the colour band that prevents China ink.Paper guide 14 protection guard shield 28a make it not contact with the leading edge of paper 2.Wear plate 14a is located on the lower surface of paper guide 14, and as mentioned above, is pressed on the surface of paper 2 by the effect of the elastic force of the weight of printhead 13 and spring 17.Gap between the surface of printhead 13 and paper 2 is so definite, so that this gap is enough to make the colour band of China ink to move this gap and is suitable for the stroke of the metal wire of printhead 13.The upper slide part 12a that is contained on the upper end of balladeur train 12 slides and the biasing force of spring 17 is passed to balladeur train 12 along the guide rail 15b of last slide guide device 15.

Following

feed rolls

4 and 6 is drive rolls, is pinch rolls and go up feed rolls 3 and 5.Following

feed rolls

4 and 6 has identical diameter and is driven along identical rotation direction with identical speed.In addition, following

feed rolls

4 and 6 can be driven with first direction of rotation and second direction of rotation opposite with first direction of rotation, paper 2 can be delivered on the platen 1 from the front side of printer shown in the arrow A among Fig. 1 like this, also can deliver on the platen 1 from the rear side of printer.Under latter event, near setting other sensor similar with 25 feed rolls 6 of back to sensor 24.

That is to say that the present invention can be used for the multi-pass type printer.The feature of multi-pass type printer 100 is shown among Fig. 4 to 16.Multi-pass type printer 100 comprises above-mentioned feature and further feature.

As shown in Figure 4, the back feeder 36 of single-sheet stationery and rear haulage feeder 40 can be arranged on the rear portion of shell 101.And the preceding feeder 37 of single-sheet stationery and front haulage feeder 38 can be arranged on the place ahead of shell 101.In addition, platen 21 (not shown in Fig. 4) is located at above the shell 101.The back feeder 36 of rear haulage feeder 40, front haulage feeder 38, single-sheet stationery and the preceding feeder of single-sheet stationery 37 are not located at the inside of shell 101 usually, but they also can be placed on the inside of shell 101 selectively.Therefore, paper 2 can from platen 21 input and select

tractor feed device

38 and 40 and single-

sheet stationery feeder

36 and 37 at least one.Bank book as the paper of desiring to print 2 can insert from platen 21.

For this reason, in the shell 101 of printer 100, be provided with fastener, in order to

tractor feed device

38 and 40 and single-

sheet stationery feeder

36 and 37 randomly to be set.The preceding feeder 37 of single-sheet stationery is fixed on the place ahead of shell 101 by supporting member 74c and 74d.The back feeder 36 of single-sheet stationery is fixed on the rear of shell 101 by supporting member 74a and 74b.Front haulage feeder 38 has standby surely supporting member 74c and 74d to be fixed on the tractor feed device framework 38a in the place ahead of shell 101.In other words, can adopt the preceding feeder 37 and the front haulage feeder 38 of single-sheet stationery selectively.Rear haulage feeder 40 has standby surely supporting

member

41a and 41b to be fixed on the tractor feed device framework 40a at the rear of shell 101.In addition, have one to be used for before the fastener of platen 21, this will be illustrated afterwards.

Fig. 5 to 10 shows the example of optional layout.In Fig. 5 to 10, the arrow that dots is expressed the direction of feed of single-sheet stationery and is discharged direction, and represents the feeding and discharge direction of continuous stationery with the arrow that solid line is represented.Bank book inserts side by side the place ahead to shell 101 from the place ahead of shell 10.

In Fig. 5, platen 21, front haulage feeder 38 and rear haulage feeder 40 all are arranged in the shell 101.In addition, flatly be provided with one after staggered layboy 46.Therefore, when with single-sheet stationery during, after printing, make single-sheet stationery be discharged on the platen 21 or be discharged on the staggered layboy 46 in back from platen feeding manually.When with front haulage feeder 38 feeding continuous stationeries, continuous stationery is being discharged into after the printing on the staggered layboy 46 in back.When opening with rear haulage feeder 40 feeding continuous stationeries, then continuous stationery is being discharged into after the printing on the platen 21.

In Fig. 6, platen 21 and front haulage feeder 38 all are arranged in the shell 101, in addition, are provided with the staggered layboy 46 in back.

In Fig. 7, platen 21 and rear haulage feeder 40 all are arranged in the shell 101.In addition, be provided with the staggered layboy 46a in back.Staggered layboy 46 among Fig. 5 and 6 is flatly arranged, but the staggered layboy 46a in back arranges that in the mode that tilts its left end is last.

In Fig. 8, the preceding feeder 37 and the rear haulage feeder 40 of platen 21, single-sheet stationery all are arranged in the shell 101.In addition, be provided with two after staggered layboy 46 and 46a.In the case, platen 21 arranges that in the mode of slight inclination its right-hand member is last, and the preceding feeder 37 of single-sheet stationery then is arranged on the below of platen 21.

In Fig. 9, the back feeder 36 of platen 21, rear haulage feeder 40 and single-sheet stationery all is arranged in the shell 101.In addition, be provided with the staggered layboy 46 in back.In the case, platen 21 is used as the platen and the staggered layboy of the big capacity of being used as of feeding paper from it, with the single-sheet stationery of accepting to send here from the back feeder 36 of single-sheet stationery.

In Figure 10, the back feeder 36 of the preceding feeder 37 of platen 21, single-sheet stationery, front haulage feeder 38, rear haulage feeder 40 and single-sheet stationery all is arranged in the shell 101.Printer 100 illustrates by well-equipped situation.But, in actual applications, can use the preceding feeder 37 of single-sheet stationery and any one in the rear haulage feeder 40 selectively.In addition, can use in front haulage feeder 38 and the rear haulage feeder 40 any one selectively.

Rear haulage feeder 40 will so be arranged, directly delivers to platen 1 so that continuous stationery can be passed at the following feed rolls 6 at rear portion and the gap between the platen 1 from rear haulage feeder 40, and this can find out from Fig. 5 to 10.Last feed rolls (pinch roll) 3 in front can move with respect to being positioned at anterior following feed rolls (driven roller) 4, and the last feed rolls (pinch roll) 5 that is positioned at the rear portion then is arranged to fixing with respect to the following feed rolls (driven roller) 6 in the back.

Figure 11 shows the printer 100 that is under the well-equipped situation, and wherein, printer 100 has the back feeder 36 of preceding feeder 37, front haulage feeder 38, rear haulage feeder 40 and the single-sheet stationery of the platen 21 that is contained on the shell 101, single-sheet stationery.But, in actual use, can all not use the

feeder

36 and 37 and

tractor feed device

38 and 40 of single-sheet stationery.

When preceding feeder 37 that uses platen 21, single-sheet stationery and front haulage feeder 38, paper 2 is delivered to platen 1 along the direction of arrow X from the front side of shell 101.This situation be called as advance to.When using the back feeder 36 of rear haulage feeder 40 and single-sheet stationery, paper 2 is delivered to platen 1 along the direction of arrow Y from the rear side of shell 101.This situation is called as laggard giving.

Shown in Figure 11 and 12, printer 100 will be designed so that the operating personnel O of feeding side that the direction of the literal that prints off can be stood in the paper 2 of printer 100 reads.That is to say that the operating personnel O that stands in printer 100 front sides can read and advance to the literal under the situation, and the operating personnel O that stands in printer 100 rear sides can read laggard to the literal under the situation.

Figure 13 and 14 shows platen 21 fixing on shell 101.Shell 101 has sidewall 12f in its front portion, and platen 21 is located between the two side.Figure 13 and 14 shows among the sidewall 12f.Each sidewall 12f has two gathering

sill

76a, 76b, and platen 21 has along the pin 21a, the 21b that extend

laterally.Pin

21a, 21b are inserted respectively among gathering sill 76a, the 76b, thereby platen is contained on the shell 101.

The gathering sill 76a that is positioned at platen 21 inboards is made into hook-type, and it comprises on one horizontal component and sloping portion once.Another gathering sill 76b is made into inverted T-shape, and it comprises on one vertical component and horizontal component once.When platen 21 was in substantially horizontal position, as shown in figure 13, pin 21a inside was positioned at the inner of the last horizontal component of gathering sill 76a, and pin 21b outside then almost is positioned at the center of the following horizontal component of outer gathering sill 76b.This position is equivalent to the position of the platen 21 of Fig. 5.

When platen 21 was in obliquity, as shown in figure 14, pin 21a inside was positioned at the inner of the part that has a down dip of gathering sill 76a, and pin 21b outside then is positioned at the inner of the following horizontal component of outer gathering sill 76b.This position is equivalent to the position of the platen 21 of Fig. 9.

In addition, shown in Fig. 8 and 10, the preceding feeder 37 of single-sheet stationery can be arranged in the place ahead of shell 101.In the case, platen 21 is raised further, with the preceding feeder 37 of single-sheet stationery be inserted in platen 21 below.In order to lift platen 21 in such a way, pin 21a inside slides backward in interior gathering sill 76a, is positioned at the center of the hook of gathering sill 76a, and pin 21b outside then moves up in the last vertical component of gathering sill 76b outside.As shown in Figure 4, the shaft-like fixed component 74c of preceding feeder 37 usefulness and the 74d of single-sheet stationery are fixed on this position.

Figure 15 and 16 shows the detail drawing of the part of the following front guide 7 in feed rolls 4 the place aheads before being positioned at of Fig. 2.This part of following front guide 7 (abbreviating front guide 7 later on as) can be provided with synchronously movably with platen 21.Front guide 7 comprises that one has the targeting part 7a and the side plate 7b that links to each other with two opposite ends of targeting part 7a of smooth curved surface.Side plate 7b can around preceding feed rolls 4 the axle 4a axis be provided with rotatably.Spring 78 pushes side plate 7b in the counterclockwise direction, thereby side plate 7b is leaned on mutually with the side plate of the preceding upper guide plate 8 that is arranged on front guide 7 tops.

Platen 21 comprises a paper supporting member or surperficial 21c and side plate 21d, and the former will be arranged to make paper supporting member 21c to be extended to the targeting part 7a of front guide 7 smoothly, and side plate 21d then links to each other with two opposite ends of paper supporting member 21c.The inner end portion 21e of paper supporting member 21c rotatably is fixed on the pin 21a, and paper supporting member 21 can rotate within the specific limits along clockwise direction like this.The same moved further of side plate 7b of the side plate 21d of platen 21 and front guide 7.

At the horizontal level of platen shown in Figure 15 21, the side plate 21d of platen 21 does not contact with the side plate 7b of front guide 7.Therefore, the targeting part 7a of front guide 7 remains on obliquity under the effect of spring 78 and by side plate 7b is leaned on mutually with the side plate of preceding upper guide plate 8, and its free end is descended.The position of the inner end portion 21e of the paper supporting member 21c of platen 21 is near the targeting part 7a of front guide 7, so that form a continuous paper transportation path.In the case, front guide 7 plays a part to from the paper 2 of platen 21 feedings or be disposed to paper 2 guiding of platen 21.In addition, front guide 7 is extended to the paper sheet delivery approach that is used for by the continuous stationery of front haulage feeder 38 feedings smoothly, and plays a part to be used for the guider of continuous stationery.

In the obliquity of platen shown in Figure 16 21, the side plate 21d of platen 21 contacts with the side plate 7b of front guide 7, thereby front guide 7 is rotated when platen 21 moves to its obliquity.Platen 21 in this position as a staggered layboy of big capacity that is used for by the paper 2 of back feeder 36 feedings of single-sheet stationery.

Figure 17 shows the printer according to another embodiment of the present invention.This printer comprises the similar element of element to the printer of Fig. 1.That is to say that this printer has a platen 1, feed rolls 3,4,5 and 6, one fixing axles 11, have a slide guide device 15 and a restraint guide rail 19 on balladeur train 12, one printheads 13, one paper guides 14, of a upper slide part 12a.

Balladeur train 12 rotatably and can move axially by 11 supportings of fixing axle, this axle is parallel to platen 1 to be arranged, is positioned at the top of platen 1 obliquely, and when sheet transport direction A looks, is positioned at the rear of gap 1a.Printhead 13 is fixed on the balladeur train 12 firmly, and is arranged in the top of platen 1, and is relative with platen 1.Therefore, printhead 13 can be along laterally moving with balladeur train 12 with respect to paper 2, and available printhead 13 prints operation.

Balladeur train 12 is made a double-arm lever, and one of them arm tilts down to stretch out from fixing axle 11.And be loaded with printhead 13.Fixing axle 11 is positioned at the opposite side of printhead 13, leaves back feed rolls 5, so that a knee-joint of balladeur train 12 closely flatly extends.Another arm of balladeur train 12 extends upward from fixing axle 11, is provided with upper slide part 12a in the upper end of the upwardly extending arm of balladeur train 12.Be provided with slide guide device 15, in order to guiding upper slide part 12a.Last slide guide device 15 can be parallel to the pivot 15c swing of fixing axle 11 and by spring 17 bias voltages, 12a contacts with the upper slide part around one.

Last slide guide device 15 comprises that one is parallel to the guide rail 15b of the band knuckle that platen 1 extends, and links to each other with arbitrary end of guide rail and perpendicular to the arm 15a of platen 1 extension.Guide rail 15b and arm 15a integrally form with a metallic plate, and arm 15a is contained on the pivot 15c swingably.At close guide rail 15b place, the two ends of spring 17 link to each other with spring support 18 respectively, and this support is fixed on the framework of printer 100.Regulating spring support 18, elastic force that just can regulating spring 17.

Last slide guide device 15 is biased by a spring (not shown), thereby swings around pivot 15c along the clockwise direction among Figure 17, and guide rail 15b then concerns with axle 11 keeping parallelisms of fixing.Therefore, under the effect of the weight of printhead 13 and by on slide guide device 15 be delivered under the effect of the spring force on the balladeur train 12, printhead 13 has the trend that moves down.

In shell, the restraint guide rail 19 that is parallel to fixed axis 11 is arranged on the opposite side that leaves slide guide device 15 with the upper slide part 12a of balladeur train 12, accept balladeur train 12 with the effect of weight of antagonism printhead 13 and the elastic force of spring, thereby prevent that wear plate 14a from directly contacting with the surperficial of platen 1.Similar among the mode of operation of this printer and the embodiment of Fig. 1 to 3, the also available mode similar to the aforementioned embodiment of other element is provided with, and also this printer can be made a multi-pass type printer simultaneously.

Claims

1. A printer comprising a casing (101), a platen (1), a fixed shaft (11), a carriage (12), a printing head (13), paper feeders (3, 4, 5, 6) and a paper guide mechanism (14), wherein the fixed shaft is arranged parallel to the platen and is obliquely located above the platen; the carriage can be rotated and axially Movably supported by the fixed shaft; the print head is fixed on the carriage and arranged above the platen, and opposite to the roll; the paper feeder is used to print the The paper is input between the platen and the print head; the paper guide mechanism is fixed on the carriage (12), so that the paper guide mechanism (14) is at least on the side of the print head (13) The weight is pressed on the surface of the paper and can move with the thickness of the paper to maintain a certain gap between the print head and the paper.

2. A printer according to claim 1, characterized in that said carriage (12) has an upper slide portion (12a) above said fixed shaft (11), and the upper slide guide (15 ) arranged parallel to the platen (1) in the housing (101) for guiding the upper slide portion (12a), the upper slide guide (15) is movable and consists of at least one The spring (17) is biased so that the paper guide (14) is pressed against the surface of the paper under the weight of the print head (13) and at least one spring (17).

3. A printer according to claim 2, characterized in that said upper slide guide (15) comprises a guide rail (15b) extending parallel to the platen (1), and any An arm (15a) connected at one end and projecting perpendicularly to said platen (1), said guide rail and arm being integrally formed with a metal plate, said arm being swingable about a pivot (15c).

4. A printer according to claim 3, characterized in that said upper slide guide (15) has a weight (16) for increasing inertia, in order to resist the reaction of the print head (13) during printing operation force.

5. A kind of printer as claimed in claim 2, it is characterized in that, described paper guiding mechanism (14) has a wear-resistant sheet (14a) fixed on it, thus makes wear-resistant sheet (14a) and paper surface directly contact, a stop system (19) is provided in the housing, which is arranged on the opposite side from the upper slide guide (15) of the carriage, to resist at least the weight of the print head (13) Instead, the carriage is received, thereby preventing the wear plate (14a) from coming into direct contact with the surface of the platen (1) when there is no paper on the platen.

6. A printer according to claim 5, characterized in that the platen (1) is cylindrical, and the wear plate (14a) has a cylindrical surface with the platen (1) Corresponding concave cylindrical surface to relieve local contact forces against the platen.

7. A kind of printer as claimed in claim 2, it is characterized in that, described paper guiding mechanism (14) has a wear-resistant sheet (14a) fixed on it, thus makes wear-resistant sheet (14a) and paper surface directly contact, a stop rail (19) is provided in said housing, which is arranged on the opposite side of the carriage from said upper slide guide (15) to resist at least the weight of the print head (13) Instead, the carriage is received, thereby preventing the wear plate (14a) from coming into direct contact with the surface of the platen (1) when there is no paper on the platen.

8. A printer according to claim 1, characterized in that said feeder comprises a first feed roller (4) on the side of the platen (21) away from said platen (1) , and a second feed roller (6) arranged on the opposite side of the platen (21) away from the platen (1), the first and second feed rollers can be rotated along the first direction of rotation and with the first A second rotational direction opposite to the rotational direction rotates, whereby paper can be fed onto the deck from one side of the deck and paper can also be fed onto the deck from the other side of the deck.

9. 1. A printer according to claim 8, characterized in that a first fastening device (76a, 76b) for placing the platen (21) is provided in said housing;

In the housing, on the side away from the platen (21) of said platen (1), there are second fastening means (41a, 41b) for accommodating the first traction feeder (38);

In the housing, third fastening means (74a, 74b) are provided on the side of the platen (21) away from the platen (1) for accommodating the first feeder (37) of cut sheets ;

In the housing, fourth fastening means (74c, 74d) are arranged on the opposite side from the platen (21) of the platen (1) for accommodating the second traction feeder (40);

In the housing, fifth fastening means (74c, 74d) are provided on the opposite side of the platen (21) from the platen (1) for mounting a second feeder (36) of cut sheets ;as well as

The first traction feeder (38), the second traction feeder (40), the first feeder (37) of cut-sheet paper and the second feeder (36) of cut-sheet paper can all be Selectively disposed in the housing, paper may be fed from a platen and select at least one of said tractor feeder and said cut sheet feeder.

10. A kind of printer as claimed in claim 1, it is characterized in that, described second traction feeder (40) will be arranged like this, so that continuous printing paper can pass through described second feeding roller (6) The gap with said platen (1) is fed directly from the second traction feeder (40) to the platen (1).

11. 10. A printer according to claim 1, wherein any one of said single-sheet paper, continuous printing paper, paper comprising a plurality of layers, and bankbook is used as the paper to be printed.