JP2001166545A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer equipped with a double-sided tray and constituted so that an end fence need not be pushed out to a paper ejection tray side. SOLUTION: This printer 1 is provided with the paper ejection tray 6 for stacking printed paper after printing the paper at a printing position, and the double-sided tray 7 receiving and stacking the paper stacked on the tray 6 and carrying the stacked paper to the printing position so as to perform double- sided printing. Then, the tray 6 is provided with a paper carrying member 102 for carrying the paper stacked on the tray 6 to the tray 7 and advancing onto the tray 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus capable of printing on both sides of printing paper.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the consumption of printing paper (hereinafter, referred to as "paper"), double-sided printing, in which printing is performed on both sides of a paper, has occupied a large part of the printing. . For this purpose, in addition to a device for obtaining a double-sided printed product by transporting the paper once printed toward the plate cylinder again, two plate cylinders are arranged to face each other, and the plate cylinders are pressed against each other via the paper. A configuration and a configuration in which a plurality of plate cylinders are arranged in parallel in a paper path to develop a device for obtaining a double-sided printed material by passing the paper once have been attempted. A printing apparatus that performs double-sided printing only by passing the sheet has a problem such as an increase in the size of the apparatus, and various apparatuses of the former type have been proposed. In order to perform double-sided printing without bothering the operator, this type of apparatus is provided with a printing apparatus such as a printing apparatus disclosed in JP-A-8-91710 and JP-A-7-81202. The paper ejection tray loaded with the printed sheets is moved to the re-feeding position, or separately from the paper ejection tray as shown in Japanese Patent Application No. 11-130264 previously filed by the present applicant. There is a type in which a double-sided tray is provided, and a sheet on one side printed on a paper discharge tray is conveyed to a re-feeding position on the double-sided tray to perform double-sided printing.

[0003]

However, Japanese Patent Application Laid-open No.
In the printing apparatuses described in Japanese Patent Application Laid-Open Nos. 9-17110 and 7-81202, there is a problem that the mechanism for moving the discharge tray to the re-feed position becomes large and complicated.
In the printing apparatus disclosed in Japanese Patent Application No. 11-130264, a single-sided printed sheet on a paper output tray is transported to a position near a refeeding position by an end plate provided on the paper output tray, and the paper is printed on both sides. An end fence provided on the tray is used to transport the paper further to the re-feed position.The end plate cannot move on the double-sided tray. Must be protruded toward the paper output tray.

An object of the present invention is to provide a printing apparatus provided with a double-sided tray, in which the end fence does not need to be protruded toward the discharge tray.

[0005]

According to a first aspect of the present invention, there is provided a printing apparatus that prints on a sheet at a printing position and has a discharge tray for stacking the printed sheet. The apparatus has a double-sided tray for receiving and stacking the sheets stacked on the sheet discharging tray, conveying the stacked sheets toward the printing position, and performing double-sided printing, and the sheet discharging tray includes the sheet discharging tray. At least a portion of the tray for transporting the paper stacked on the tray to the double-sided tray has a paper transport member that can enter the double-sided tray.

According to a second aspect of the present invention, in the printing apparatus according to the first aspect, the discharge tray receives an end plate of a sheet conveyed from the printing position, and the end plate is connected to the double-sided tray. And an end plate displacing means for displacing the paper conveying member toward the end plate, wherein the paper transport member is disposed integrally with the end plate, and the end plate displacing means displaces the paper transport member integrally with the end plate. It is characterized by.

According to a third aspect of the present invention, in the printing apparatus according to the second aspect, the sheet transport member has a contact surface for contacting the sheet, and the contact surface is placed on the sheet tray of the discharge tray. When the second position is undulating between a first position substantially parallel to the surface and a second position where the contact surface is substantially perpendicular to the sheet placement surface. Wherein the abutting surface abuts the paper and transports the paper onto the double-sided tray.

According to a fourth aspect of the present invention, in the printing apparatus according to the third aspect, the paper discharge tray has an engaging member that can move forward and backward in a transport path in which the paper transport member is displaced by the end plate displacing means. The paper transport member may be in the second position by engaging with the engagement member located in the transport path.

According to a fifth aspect of the present invention, there is provided the printing apparatus according to the fourth aspect, further comprising an engaging member driving means for moving the engaging member forward and backward to the transport path.

The invention according to claim 6 is the invention according to claim 4 or 5.
In the printing apparatus described above, the engagement member has a cam surface that engages with the paper transport member.

[0011] The invention according to claim 7 is the invention according to claims 3 to 6.
In the printing apparatus according to any one of the above, a concave portion for receiving the paper transport member is formed on the paper mounting surface to avoid interference between the paper transport member in the first position and the paper. It is characterized by the following.

According to an eighth aspect of the present invention, in the printing apparatus according to the second aspect, the paper transport member is movable relative to the end plate toward the double-sided tray of the end plate. I do.

According to a ninth aspect of the present invention, in the printing apparatus according to the eighth aspect, the paper discharge tray is provided with an engaging member disposed in a plate path in which the end plate is displaced by the end plate displacing means. A drive member disposed integrally with the end plate to drive the paper transport member toward the double-sided tray of the end plate, wherein the end plate is moved toward the double-sided tray by the end plate displacing means. The sheet conveying member is displaced toward the double-sided tray side of the end plate by engaging the driving member with the engaging member when displacing.

According to a tenth aspect of the present invention, in the printing apparatus according to the ninth aspect, the engaging member is a first rack, and the driving member has a pinion engageable with the first rack. The paper transport member has a second rack engaged with the pinion.

According to an eleventh aspect of the present invention, in the printing apparatus according to the ninth aspect, the engaging member is a cam, and the driving member has a link mechanism capable of engaging with the cam. The transport member is integral with the link mechanism.

[0016]

FIG. 1 shows a stencil printing apparatus as a printing apparatus capable of performing double-sided printing to which the present invention is applied. Stencil printing machine 1
Is a printing paper (hereinafter, referred to as “paper”) between a printing drum 2 as a plate cylinder disposed in the upper central portion of the stencil printing apparatus 1 and the printing drum 2 disposed opposite to the printing drum 2.
Cylinder 3 as a press-contact means for press-contacting the plate, and a plate-making apparatus 107 as a plate-making means for making a stencil sheet as a master.
A master transport unit (not shown) disposed in the housing of the plate making apparatus 107 for transporting a master having undergone plate making toward the printing drum 2, and printing on paper at an opposing portion of the printing drum 2 and the impression cylinder 3. A paper feed tray 5 loaded with new paper to be supplied toward the printing position 4 to be performed, a paper discharge tray 6 serving as a paper discharge tray loaded with paper printed at the printing position 4,
Accepts and stacks the sheets stacked on the output tray 6,
A two-sided tray 7 for carrying double-sided printing, which conveys the loaded paper toward the printing position 4, a plate discharging device 8 as a plate discharging device for removing used stencil paper from the printing drum 2 and storing, It mainly has an image reading section 9 for reading an image and sending the read image data to the plate making device 107.

As the stencil paper, a laminated structure of a thin film made of PET and a base member made of Japanese paper is used, but the thin film may be made of another material, and the base member may be made of synthetic fiber. And so on.
A large number of sheets are placed on the sheet supply table 5, are separated and conveyed one by one, are printed on a surface facing upward during the conveyance, and are sent to the sheet discharge tray 6. Paper feed table 5
Some transporting means are involved before the paper is conveyed to the paper discharge tray 6 from among the paper feed rollers 10 and 10.
There are a feed roller 11 as a registration roller, a paper discharge suction unit 12, and the like. The paper feed roller 10 is swingably supported by a vertically movable drive shaft 10a. As the paper feed proceeds, the position of the paper feed roller 10 is lowered, and a predetermined amount is detected when a sensor (not shown) detects the position. The paper feed table 5 is raised only so that the top sheet is always controlled to a height suitable for paper feeding. The sheet feeder 5 has side fences 26 and 26, and regulates both ends of the sheet placed on the sheet feeder 5.

An upper guide plate 13 and a lower guide plate 14 are arranged opposite to each other at a position on the near side from the downstream side of the paper feed roller 10 to the printing position 4 via the feed roller 11 in the paper transport direction. ing. The feed roller 11 is
Feed roller (upper) 11 arranged to be in opposing contact
a, and a feed roller (lower) 11b. The sheet is separated by the sheet feed roller 10 and sent out, and is fed between the upper and lower guide plates 13 and 14 toward the printing position 4. . The sheet that has exited the printing position 4 is sent out to the paper discharge suction unit 12, and the paper discharge suction unit 12
The paper is further sent to the paper discharge tray 6. Discharge suction unit 1
2 has a transport belt 17 and a transport suction fan 18 spanned between a driving roller 15 and a driven roller 16, and while the transport suction fan 18 sucks printed paper on the transport belt 17, The paper is conveyed toward the paper discharge tray 6 by the conveyance belt 17. Feed roller 1 of lower guide plate 14 in the paper transport direction
A part on the upstream side of 1 is cut out so as to receive a sheet printed on one side and conveyed from the double-sided tray 7.

The printing drum 2 has a stencil retaining device 19 as a clamper for clamping the leading end of the stencil sheet which is heat-sensitive on the peripheral surface. In the printing drum 2, although not shown, an ink supply pipe for supplying ink to the inner peripheral surface thereof, an ink supply roller, a doctor roller, and a wedge-shaped ink reservoir formed by the ink supply roller and the doctor roller. A well-known ink supply device composed of the above-described components is provided.

The impression cylinder 3 includes a support arm 2 for supporting a support shaft 20.
1 supports the printing drum 2 so as to be able to freely move toward and away from the printing drum 2. One end of the support arm 21 is rotatably supported on a casing (not shown) of the stencil printing machine 1 by a shaft 22. A portion of the support arm 21 opposite to the shaft 22 with respect to the support shaft 20 is urged toward the printing drum 2 by a tension spring 23 whose one end is locked to a casing of the stencil printing machine 1. The other end of the support arm 21 has a cam 2
4 is engaged, and the long diameter portion of the cam 24 is
, The impression cylinder 3 is separated from the printing drum 2.

Although not shown, the stencil discharging device 8 includes a stencil discharging box for storing used stencil paper, an opening / closing plate for opening and closing the stencil discharging box, and a standby position and an operating position in contact with the printing drum 2. A known method including a swingable peeling roller capable of swinging, a peeling roller disposed opposite to the swinging peeling roller, and a guide for forming a plate discharge path for guiding a used stencil sheet to a plate discharge box between the open / close plate and the open / close plate. It is a structure of. In the vicinity of the peripheral surface of the printing drum 2, an air knife 2 that peels off the leading end when the paper printed at the printing position 4 is wound around the printing drum 2 due to the viscosity of the ink.
5 are provided. The air knife 25 blows air between the leading edge of the sheet and the peripheral surface of the printing drum 2,
The upper sheet is forcibly removed.

The image reading section 9 is located at the top of the stencil printing apparatus 1. Although not shown, the image reading unit 9 includes a document tray for placing documents, a document transport roller for separating and transporting the documents one by one, a document separating roller, a contact glass on which the document to be read is placed, and a contact for the document. It has a well-known configuration including an endless and wide transport belt for feeding over glass, a reading sensor device provided below the contact glass, and the like. The stencil printing apparatus 1 has storage means (not shown) for storing the image data read by the image reading unit 9 and outputting the image data to the stencil making apparatus 107 in a timely manner.

Although not shown, the stencil making apparatus 107 has a support means for supporting a master roll having a stencil sheet in a roll form, a thermal head disposed on the film surface side of the stencil sheet, and a thermal head opposed to the thermal head. This is a known configuration including a platen roller disposed on the base member side of the stencil sheet, a cutter for cutting the stencil sheet that has been made, and the like.

An operation panel (not shown) for performing various operations is provided outside the stencil printing apparatus 1. The operation panel includes a plate making start button for instructing execution of plate making, a print start button for instructing execution of printing, and a stencil printing machine 1 provided on a normal operation panel.
In addition to a stop button for stopping the operation, a numeric keypad for instructing the number of prints, the number of copies, and the like, a print mode designation key as a print mode designation means is provided. The print mode designation key has a normal mode button for supplying paper from the paper supply table 5 and a duplex mode button for supplying paper from the duplex tray 7.

The paper discharge tray 6 includes an end plate 27 for receiving the leading edge of the paper conveyed from the print position 4 via the paper discharge suction unit 12, a mounting table 28 having a paper mounting surface 33 for mounting the paper, Side fences 29, 29 for regulating each side edge of the sheet, and at least a part of the side fences for transporting the sheet stacked on the sheet discharge tray 6 to the double-sided tray 7 as shown in FIGS. Double-sided tray 7
It has a paper transport member 102 that can enter above. The double-sided tray 7 includes an end fence 30 that further transports the paper transported from the paper discharge tray 6, a loading table 31 that is fixed to the main body of the stencil printing apparatus 1 and has a paper loading surface 34 on which paper is loaded, And side fences 32, 32 for regulating the respective edges of the respective fences. Side fence 3
2 and 32 are arranged so as to be substantially parallel to each other. The double-sided tray 7 is disposed such that the sheet placement surface 34 is substantially horizontal. The mounting table 28 has an end on the side of the double-sided tray 7 supported by a shaft 35.
The end on the 7 side can swing up and down. The main body of the stencil printing machine 1 is provided with a gear 36 that is rotationally driven by a drive source (not shown).
A gear surface 37 engaged with the gear 36 is provided at the side end. The gear 36 and the gear surface 37 are connected to the paper
And a paper output tray swinging means 38 for swinging the paper output tray 6 so as to change the angle between the paper tray and the paper mounting surface 34.

In the vicinity of the end of the double-sided tray 7 opposite to the end fence 30, a feeding roller 97 that feeds only the uppermost sheet out of the sheets stacked on the sheet mounting surface 34 toward the printing position 4. And a paper feed roller 39 for taking over the conveyance of the paper sent out by the feed roller 97. The feed-out roller 97 and the paper feed roller 39 are supported by supporting means (not shown), and are driven up and down so as to occupy a position suitable for feeding the uppermost sheet. On the downstream side of the paper feed roller 39 in the paper conveyance direction, a guide pair 4 having one end opened to the paper feed roller 39 and the other end connected to a notch provided in the lower guide plate 14.
In the middle of the paper transport path formed by the guide pair 40, the paper is further fed to the printing position 4 by inheriting the paper sent from the paper feed roller 39.
A transport roller 41 for feeding toward is provided.

Although the discharge tray 6 and the double-sided tray 7 are separate bodies, the discharge tray 6 and the double-sided tray 7 are substantially integrated. The paper discharge tray 6 and the double-sided tray 7 can be integrally detachably attached to the main body of the stencil printing apparatus 1 and can also be detachably attached separately. 2, 3 and 8, etc., the end plate 27 and the end fence 30
The side fence 29 and the side fence 32 can be displaced in the direction A and the direction B, which are directions parallel to the direction in which the sheet is discharged, in the sheet placement surfaces 33 and 34. , The end plate 27 and the end fence 30 can be displaced in the direction C perpendicular to the direction in which the end fence 30 is displaced.

As shown in FIGS. 3, 4, 7 and the like, a notch 42 extending in the AB direction is formed at the center of the mounting table 28 having the sheet FIG. 3 shows the inside of the notch 42 in the AB direction.
Guide members 43 forming rails shown in 5, 6 and the like are provided. The guide member 43 is a member having a concave cross section that opens downward, and has a concave portion 100. End plate 27
Is movable above the guide member 43 by the slider 106 integrated with the end plate 27, and is displaced toward the double-sided tray 7 by being displaced in the A direction. As shown in FIGS. 3 and 7, notches 44 extending in the C direction are provided at the respective ends in the C direction, that is, the respective ends corresponding to the side edges in the width direction of the sheet, on the top plate 28 '. , 44 are formed. Each side fence 29 has a notch 4
4 and can be displaced in the direction C so as to be displaced in a direction approaching each other or in a direction separating from each other.

As shown in FIG. 8, at the end in the B direction of the upper surface plate 31 'of the mounting table 31 having the side fence 32 and the like on its upper surface, it is connected to the notch 42 on the sheet discharge tray 6 side. A first notch 45 extending in the AB direction is formed, and a pair of second notches 46, 46 extending in the AB direction are provided at positions corresponding to both sides of the notch 45.
Is formed. The first notch 45 slidably receives the sheet conveying member 102, and the second notches 46, 46 slidably receive the end fence 30. Notch 46 of the upper surface plate 31 ',
A sliding groove 65 shown in FIGS. 14, 15, 17, 18 and the like in which a support 91 as a slider shown in FIG. On the side of the upper surface plate 31 'in the A direction from the notches 46, 46, cuts extending in the C direction are provided at each end in the C direction, that is, each end corresponding to the side edge in the width direction of the sheet. Notches 48, 48 are formed. Each of the side fences 32 is slidable in the notch 48, and is displaced in the direction C so as to be displaced in a direction approaching each other or in a direction separating from each other. Side fence 29,
The ends of the side fences 32 in the direction facing each other are
It is bent so as to expand in the direction C.

As shown in FIG. 2 or FIG.
On the bottom plate 28 ″ below the top plate 28 ′, end plate displacement means for displacing the end plate 27 in the AB direction, and side fence displacement means for displacing the side fence 29 in the C direction. The end plate displacement means is an end plate 2.
7 for transporting the paper stacked on the paper discharge tray 6 to the double-sided tray 7 by displacing the paper transport member 7 and the paper transport member 102 in the direction A, and having the gear shaft 50 and rotating the gear shaft 50. A motor 51 fixed on the bottom plate 28 ″ to be driven, a gear 52 driven to rotate by a gear shaft 50,
Gear 5 driven to rotate by gear 52 about shaft 53
4, a driving pulley 55 that rotates integrally with the gear 54, and driven pulleys 56a, 56b, 56c, 56d, 56e, 56
f, a driving pulley 55 and driven pulleys 56a, 56b,
It has an endless belt 57 wound around 56c, 56d, 56e, 56f. The endless belt 57 has a belt fixing member 9 fixed to the lower surface of the slide plate 104 shown in FIG.
8 and the end plate 27 is displaced in the AB direction by the rotation of the drive pulley 55.

The side fence displacement means includes a motor 59 fixed on the bottom plate 28 ″ having a gear shaft 58 for driving the gear shaft 58, a gear 61 driven by the gear shaft 58, and a gear 61. Drive pulley 62 provided integrally with
And driven pulleys 64a, 64b, 64c, and an endless belt 66 wound around the driving pulley 62 and driven pulleys 64a, 64b, 64c. Endless belt 66
Is engaged with a belt fixing member 60 provided integrally with each side fence 29, and by rotating the drive pulley 62, the side fences 29 are simultaneously displaced in the C direction, and the side fences 29 are mutually moved. Move closer and further away.

In FIG. 3, reference numeral 68 denotes a reflection-type sensor for detecting the position of the end plate 27 in a state where the paper can be discharged from the stencil printing apparatus 1, and reference numeral 69 denotes a paper transport member 102 which transports the paper to the double-sided tray 7. Reference numeral 70 denotes a reflection-type sensor that detects the position of the side fence 29 in a state where the end plate 27 is transferred. End plate 2
7. A home position sensor may be provided in each of the side fences 29, and an encoder may be provided in each of the motors 51 and 59 to detect the position of each of the end plate 27 and the side fence 29.

As shown in FIG. 9, an end fence displacement means for displacing the end fence 30 in the AB direction is provided on the inside of the mounting table 31, that is, on the bottom plate 31 "below the top plate 31 '. Side fence displacing means for displacing the sheet in the direction C. The end fence displacing means is a position for conveying the paper conveyed from the paper discharge tray 6 toward the printing position 4, that is, And a bottom plate 31 ″ having a gear shaft 71 for rotating the gear shaft 71, and displacing the sheet to a sheet feeding position where the leading end in the direction A of the sheet is aligned with the leading end of the top plate 31 ′.
A motor 72 fixedly mounted thereon, a gear 73 driven to rotate by a gear shaft 71, a gear 75 driven to rotate by a gear 73 around a shaft 74, and a gear 7 provided on the shaft 74.
5 and a driven pulley 77 that rotates integrally with
And an endless belt 78 wound around a driving pulley 76 and a driven pulley 77. One end of the endless belt 78 is engaged with the support body 91, and the end plate 30 is displaced in the AB direction by the rotation of the drive pulley 76.

The side fence displacement means includes a motor 80 fixed on the bottom plate 31 "having a gear shaft 79 for driving the gear shaft 79, and a gear driven to rotate about the shaft 81 by the gear shaft 79. 82, a driving pulley 83 provided on a shaft 81, and a driven pulley 85 rotating about a shaft 84
A pinion 86 provided on a shaft 84 and integrally rotating with a driven pulley 85; an endless belt 87 wound around the driving pulley 83 and the driven pulley 85;
Racks 88 respectively engaged with pinions 86
And When the motor 80 drives the drive pulley 83 to rotate, the side fences 32 are simultaneously displaced in the C direction, and the side fences 32 are moved toward and away from each other. In FIG. 9, reference numeral 89 denotes a reflection type sensor for detecting the position of the end fence 30 when the end fence 30 is displaced in the direction A after the sheet conveying member 102 transfers the sheet to the duplex tray 7, and reference numeral 90 denotes a side fence. 32 shows a reflection-type sensor that detects the position of 32.
As in the case of the paper discharge tray 6, a home position sensor is provided for each of the end fence 30 and the side fence 32, and an encoder is provided for each of the motors 51 and 59.
Each position may be detected.

The end fence 30 is used to hold the paper sheets 33 and 34 when the paper is discharged to the paper discharge tray 6.
The two-sided tray 7 cannot receive the sheets stacked on the sheet discharge tray 6 in this state, and the two-sided tray 7 is not allowed to receive the sheet stacked on the sheet discharge tray 6.
When receiving sheets stacked on the sheet, it is necessary to retract the end fence 30 from the sheet mounting surface 34.
FIG. 10 shows an end fence retracting means for retracting the end fence 30 from above the sheet placement surface 34. The end fence retracting means includes a support 91, a solenoid 92 fixed to the support 91, a shaft 93 rotatable with respect to the support 91 but integral with the end fence 30, and one end of the shaft 93. The swing member 94 fixed to the solenoid 9 and the solenoid 9
2, a tension spring 95 having one end engaged with the swing member 94 at the other end, and a coil spring 96 wound around the shaft 93.
And The support 91 supports the base 30 a of the end fence 30.

The coil spring 96 opposes the tension spring 95, and the contact portion 30b of the end fence 30 against which the sheet contacts.
Is urged to swing upward about the shaft 93, but the support 91 has an engaging portion 91a that engages the base 30a from above, and the base 30a is horizontal. The upward swing of the contact portion 30 is regulated at the position where. When the solenoid 92 is energized, the swing member 94 swings in the direction A against the coil spring 96, and swings the contact portion 30a downward so that the contact portion 30a is positioned below the sheet placement surface 34. Then, the sheet is retracted from the sheet placing surface 34.

The stencil printer 1 has a detecting means for detecting the size of a sheet. In the present embodiment, the detecting means uses a known mechanism for detecting the size of the paper placed on the paper feed table 5, but has a plurality of sizes such as when there are a plurality of paper feed tables 5. For example, when the sheet can be used, a key for specifying the size of the sheet to be used on the operation panel may be used as the detection unit. Although not shown in the drawings, each of the discharge tray 6 and the duplex tray 7 includes a discharge tray paper detection sensor and a duplex tray paper detection sensor that detect the presence or absence of paper on the discharge tray 6 and the duplex tray 7. Is provided.

As shown in FIG. 5 or 6, the slider 10
6 is a flat base 10 located above the guide member 43.
6a, a holding portion 106b extending in the direction A so as to be bent with respect to the base 106a at both ends in the A direction of the base 106a so as to sandwich the guide member 43, and a base 10
A pair of support portions 106c provided so as to be bent with respect to the base portion 106a on both sides near the end in the B direction of 6a in a direction opposite to the rising direction of the holding portion 106b are main components. The holding portion 106b is a pair of rectangular flat plates,
A pair of protrusions 106d are formed such that the side edges at the end in the B direction are integral with the base 106a, and protrude in a direction away from each other at the end in the A direction, and are separated from each other on the B direction side with respect to the protrusion 106d. And a pair of engaging portions 106e formed so as to be bent in the direction in which they are bent. The engaging portion 106e is formed on the side edge on the side where the holding portion 106b is integrated with the base portion 106a. Each of the support portions 106c, 106c has a hole 106f arranged on a straight line in the C direction.

The holes 106f and 106f are respectively formed in a base 27a extending at the center of the lower edge of the end plate 27.
The hole 1b communicates with the hole 27b formed in the
The slider 106 and the end plate 27 are integrated by inserting the pin 99 into the holes 06f, 106f and the hole 27b. The end plate 27 is rotatable about a pin 99 with respect to the slider 106. The sheet transport member 102 is also integrated with the slider 106. The sheet conveying member 102 is provided on the contact surface 10 that contacts the sheet.
2a, a pair of legs 102c formed to bend with respect to the flat plate portion 102b so as to sandwich the holding portion 106b, and a pair of legs 102c, A pair of rollers 102d rotatably supported on opposite sides, and each leg 102c
Has a hole 102e formed so as to be aligned on a straight line in the direction C at the center of the leg 102c, and a concave portion 102f formed on one side edge of each leg 102c.

By fitting the projections 106d into the holes 102e, the sheet transporting member 102 is rotatably integrated with the slider 106. A spring 103 as an elastic body is provided at the tip of each projection 106d fitted in each hole 102e.
Is attached. One end of the spring 103 is engaged with the concave portion 102f, and the other end is engaged with the lower side of the engaging portion 106e.
b. In the state shown in FIG. 6 where the flat plate portion 102b contacts the holding portion 106b, the contact surface 102a is substantially flush with the upper surface of the base portion 106a, and is substantially parallel to the sheet placement surface 33.
This state is referred to as a first state of the sheet conveying member 102. The sheet conveying member 102 has a contact surface 1 with reference to FIG.
02a may take a position substantially perpendicular to the sheet placement surface 33, and this position is referred to as a second position. Paper transport member 102
Is undulating between a first position and a second position.

The slider 106 also includes the slider 10.
Slide plate 104 for integrating 6 with guide member 43
And the holding member 105 are integrally provided so that the guide member 43 is sandwiched between the slider 106, the slide plate 104 and the holding member 105. Holding member 10
Reference numeral 5 denotes a base 105a located on the opposite side of the slider 106 with respect to the guide member 43, and the guide member 43 and the support 106c.
, A pair of bent portions 105b formed to bend from the base portion 105a toward the slider 106, a hook portion 105c formed at the tip of each bent portion 105b, and a guide member for the base portion 105a. It has two projections 105d provided side by side in the C direction on the surface on the 43 side. The slide plate 104 has a flat plate portion 104a that slides in the concave portion 100 and protrusions 104b disposed at positions facing the respective protrusions 105d.
04a is processed to reduce friction with the guide member 43.

A spring 107 as an elastic member for urging the slide plate 104 and the holding member 106 away from each other is disposed between the protrusion 104b and the protrusion 105d. The hooks 105 c and 105 c are engaged with the pins 99, and the holding member 105 is
Is held in position. Therefore, the slide plate 104 is pressed against the guide member 43 by the holding member 105 by the urging action of the spring 107.

As shown in FIGS. 4 and 7, the sheet carrying member 10 in the first position is provided on the sheet placing surface 33 of the upper plate 28 '.
In order to avoid interference between the second flat plate portion 102b and the sheet, a concave portion 108 for receiving the flat plate portion 102b is formed.
As described above, the sheet conveying member 102 is integrated with the end plate 27 via the slider 106, and can be displaced in the AB direction along the guide member 43 by the end plate displacing means. Top plate 2
8 ′ is on the opposite side of the sheet placing surface 33 with respect to the concave portion 108,
It has a pair of cam surfaces 109 which are formed so as to enter in a direction approaching each other from both sides of the notch 42 and can be engaged with the roller 102d. The cam surface 109 is a double-sided tray 7
Extend to a position adjacent to.

As shown in FIGS. 7, 11, 12, 13, etc.
An engaging member 11 engageable with one of the rollers 102d is provided on the end side in the direction B of the cam surface 109 inside the mounting table 28.
0 is provided. The engaging member 110 is made movable by the engaging member driving means 111 on a path on which the sheet conveying member 102 is displaced by the end plate displacing means, that is, on a conveying path. The engagement member driving unit 111 includes a support plate 111a that supports the engagement member 110,
A solenoid 111b for displacing the support plate 111a in the C direction so as to advance and retreat the carriage member 0 into the transport path, and biases the support plate 111a in a direction to retract the engaging member 110 from the transport path as shown in FIGS. Tension spring 11 as elastic body
1c, an elongated hole 111d formed in the support plate 111a in a direction substantially parallel to the C direction, two pins 111e engaged with the elongated hole 111d, and an engagement member 110 for fixing the engagement member 110 to the support plate 111a. And a screw 111f. The energizing member driving means 111 opposes the urging force of the tension spring 111c by energizing the solenoid 111b, as shown in FIGS.
The engaging member 110 is caused to enter the conveyance path as shown in FIG.

As shown in FIGS.
10 is inclined upward toward the downstream side in the direction A,
It has a cam surface 112 that can be smoothly engaged with 2d.
The cam surface 112 is continuous with the cam surface 109 shown in FIGS. 4 and 7 when the engaging member 102 is in the transport path. Therefore, the sheet conveying member 102 is displaced in the direction A and the roller 102d rides on the cam surface 112, so that the sheet conveying member 102 takes the second state from the first state, and the sheet conveying member 102 moves to the second state. When the roller 102d is further displaced in the direction A after taking the posture, the roller 102d
12, the paper transport member 102 continues to move in the direction A while maintaining the second position. The end point of the movement of the sheet conveying member 102 in the direction A is a position where a part of the flat plate portion 102b and a part of the leg portion 102c enter the first cutout 45 formed in the double-sided tray 7 shown in FIG. is there.

The present embodiment is configured as described above. When printing is started, the operator operates the print mode designating key on the operation panel to designate the print mode. When the normal mode is selected by pressing the normal mode button, printing is performed using the paper stacked on the paper feed tray 5. When you select the duplex mode by pressing the duplex mode button,
Printing is performed using the paper stacked on the paper discharge tray 6.
Hereinafter, printing in each mode will be described. Normal mode While selecting the normal mode button on the operation panel,
The required number of prints is designated using the numeric keypad. On the other hand, when a predetermined original is set on the original receiving tray and the plate making start button is turned on, the processing of the used stencil sheet remaining on the printing drum 2 in the previous printing process is performed as follows. When the printing drum 2 rotates and the stencil catching device 19 reaches the stripping position near the plate discharging device 8, the printing drum 2 stops and is operated by an opening / closing mechanism (not shown) of the stencil catching device 19. Is released. The used stencil sheet released by the release of the clamp at the leading end is peeled from the leading end by the swinging peeling roller displaced to the operating position, and is opened and closed by the rotation of the peeling roller and the printing drum 2. The sheet is discharged into a plate discharge box via a plate discharge path formed between the plate and the guide.

The printing drum 2 rotates clockwise while the used stencil sheet is taken in the plate discharging device 8,
When the used stencil sheet is rotated to a predetermined position where the stencil sheet is completely discharged, a sensor (not shown) detects the rotation, the opening / closing plate closes the stencil discharge box, and the oscillating peeling roller returns to the standby position.
The printing drum 2 further rotates, and the base paper locking device 19
At the base paper supply position indicated by the two-dot chain line, this is detected by a sensor (not shown), and the rotation of the printing drum 2 is stopped.
The stencil making apparatus 107 waits until the printing drum 2 starts feeding the stencil sheet which has not been used on the printing drum 2.

In parallel with the plate discharging process, a well-known document reading process starts at the same time, the image data of the document is read by the reading sensor device, and the electric signal photoelectrically converted in the reading sensor device is converted into a stencil printing device. The data is input to an A / D (analog / digital) conversion board (not shown) provided in the main body of the stencil printing machine, and is stored in a storage unit (not shown) provided in the main body of the stencil printing apparatus. Simultaneously with the storage, a stencil making process and a subsequent stencil feeding process are started.

In the plate making apparatus 107, the platen roller pressing the stencil sheet against the thermal head rotates,
The stencil sheet is transported. On the stencil sheet being transported, a plurality of heating elements arranged in a line on the thermal head
According to the digital image signal of the original document which is temporarily stored in the storage means (not shown) and subjected to various processes by the plate-making substrate, each selectively generates heat according to the digital image signal, and the thermoplastic resin film of the stencil sheet is melt-punched. . The perforated stencil paper is
When the stencil sheet is conveyed toward the printing drum 2 by the master conveying means and reaches the stencil locking device 19 whose end is expanded, the stencil locking device 19 is closed and the stencil sheet is clamped. The printing drum 2 rotates, and the stencil sheet is gradually wound around the outer peripheral surface of the printing drum 2. At this time, since the long diameter portion of the cam 24 is in contact with the support arm 21 and the impression cylinder 3 is separated from the printing drum 2, the stencil retaining device 19 does not hinder the rotation of the drum 2. . The stencil sheet after the stencil making is cut into a predetermined length by a cutter.

In the plate applying step, at a predetermined timing, the top one of the sheets stacked on the sheet supply table 5 is sent toward the feed roller 11 by the sheet supply roller 10, The printing paper 11 is fed between the printing drum 2 and the impression cylinder 3 at a predetermined timing synchronized with the rotation of the printing drum 2. The paper is simultaneously pressed against the plate-making unused stencil sheet newly mounted on the outer peripheral surface of the printing drum 2 and the impression cylinder 3, and the printing ink is applied to the upper surface of the paper from the perforated portion of the plate-making unused stencil sheet. The transfer is performed and printing is performed.

When the paper thus printed passes the printing position 4, the printing drum 2 is moved by the air knife 25.
Is peeled off from the stencil sheet mounted on the outer peripheral surface of the stencil sheet, is conveyed by the sheet discharge suction unit 12, and falls onto the sheet discharge tray 6, thereby completing the plate attaching process. Next, in a process similar to the plate attaching process, a printing process including a paper feeding, printing, and paper discharging process is repeatedly performed for the number of prints set by the numeric keypad. According to the size of the sheet detected by the detecting means, the side fence displacing means in the discharge tray 6 displaces the side fence 29, and the detection by the sensor 70
The distance between the two side fences 29 is substantially the same as the width of the sheet, and the end of the discharge tray 6 on the end plate 6 side is lower than the end on the double-sided tray 7 as shown in FIG. Since the sheet is displaced, the sheet discharged from the stencil printing machine 1 does not rub against the sheet stacking surface 33 or the sheet already stacked on the sheet discharge tray 6, and both side edges are restricted by the side fence 29. Then, the sheets are stacked on the sheet discharge tray 6 in an orderly manner. The end plate 27 also occupies a position suitable for receiving the leading edge of the sheet by the sensor 68 detecting the displacement of the end plate displacing means in accordance with the size of the sheet detected by the detecting means. In the trial printing and printing steps, as shown in FIG. 1, when the stencil retaining device 19 faces the impression cylinder 3, the flat portion of the impression cylinder 3 faces the printing drum 2. Apparatus 1
9 does not contact the impression cylinder 3. Duplex Mode Printing and discharging processes in the duplex mode are performed in substantially the same manner as in the normal mode. What is different from the normal mode is an operation related to sheet feeding. After the printing in the normal mode is completed, the user selects the double-sided mode button on the operation panel and designates the required number of prints with the ten keys, and starts the process of moving the paper on the paper output tray 6 to the double-sided tray 7. . When the discharge tray paper detection sensor detects that there is no paper on the discharge tray 6, pressing of the duplex mode button is invalidated, and the operation panel indicates that there is no paper to be used in the duplex mode. . This display is also made when the double-sided tray paper detection sensor detects that the paper on the double-sided tray has run out during printing in the double-sided mode.

After the end of the normal mode and before the start of the duplex mode, the leading end of the sheet in the B direction is
And is placed on the paper discharge tray 6 in a state where it is touched. As shown in FIG. 15, simultaneously with the start of the duplex mode, the paper output tray swinging means is operated, and the paper output tray 6 is rocked so that the paper mounting surface 33 is substantially horizontal. And the paper placement surface 34 are positioned on substantially the same plane,
The duplex tray 7 is ready to accept paper. When the sheet placement surface 33 and the sheet placement surface 34 are positioned in substantially the same plane, the end fence retracting means operates to retract the end fence 30 below the sheet placement surfaces 33 and 34.
The solenoid 111b is not energized, and the engaging member 110 is retracted from the transport path by the urging force of the tension spring 111c as shown in FIG.

When the end fence 30 is retracted, the end plate displacing means displaces the end plate 27 in the direction A as shown in FIG. Are transported to the duplex tray 7 side. The sensor 68 closest to the double-sided tray 7 is the end plate displacing means.
The end plate 27 is displaced until 6 is detected. The side fence displacing means in the double-sided tray 7 displaces the side fence 29 in accordance with the size of the sheet detected by the detecting means. Since the width L is about 10 mm larger and the side of the side fence 32 on the discharge tray 6 is expanded toward the discharge tray 6,
The paper smoothly moves to the duplex tray 7 side.

When an image having a large amount of solid portion is printed on a weak paper such as a sheet of paper, for example, the side of the sheet having a large solid portion becomes heavier with ink, and a portion having a large solid portion becomes heavy. Because the printing surface of the paper expands due to the water content of the ink, if the solid portion is biased to one side of the paper, the portion may be warped in a convex shape. In some cases, the central portion of the paper does not have a uniform concave shape and drops from the side with many solid portions, and the paper on the paper output tray may not be sufficiently aligned. In such a case, since the distance between the side fences 32 is L, the paper is released from the restraint by the side fences 29, so that the paper slightly spreads in the width direction.

Thereafter, the end plate displacement means is moved to the position shown in FIG.
As shown in FIG.
The end plate 27 is displaced in the B direction until 2d occupies a position downstream of the engagement member 110 in the B direction. In this state, the solenoid 111b is energized to cause the engaging member 110 to enter the conveyance path as shown in FIG.
When the end plate displacing means again displaces the engaging member 110 in the direction A together with the end plate 27 as shown in FIG. 0, the roller 111b engages with the engaging member 110, and the paper conveying member 102 moves from the first pair to the second pair. Displaced to the posture. The paper conveying member 102 is further displaced in the direction A, and the contact surface 10
2a contacts the downstream end of the sheet in the direction B and conveys the sheet onto the double-sided tray 7, and when a part of the flat plate portion 102b and the leg portion 102c is positioned on the double-sided tray 7 as shown in FIG. When the slider 106 is detected, the operation of the end plate displacement means is switched.

The end plate displacement means whose operation has been switched returns the end plate 27 to the original position as shown in FIG. In this state, end fence 3
While returning to 0, the engaging member also returns to the original position as shown in FIG. The end fence 30 that has returned to the original position is aligned with the leading end of the sheet in the B direction. This is because, in the state shown in FIG. 21, the sheet conveying member 102 is moving the sheet so that the end fence 30 that has returned to the original position is aligned with the front end in the direction B of the sheet.

The end fence 30 that has returned to the original position is moved by the end fence displacing means to a sheet feeding position where the leading end in the direction A of the sheet abuts on the feed roller 97, ie, a sheet re-feeding position, as shown in FIG. In the direction A. In this state, the side fence 32 is reciprocated in the C direction by the side fence displacement means to align the paper in the width direction of the paper, that is, in the C direction. This paper alignment operation involves increasing the distance between the side fences 32,
This is a so-called jogger operation in which the operation of changing the size from L to the size W substantially equal to the width of the sheet is performed at least once. The number of times the distance between the side fences 32 is changed between L and W can be appropriately selected.

After the jogger operation of the side fence 32 is started, the end fence 30 is also moved to the side fence 32.
Performs the same jogger operation as
AB, which is the paper longitudinal direction, that is, the paper transport direction.
Align the paper in the direction. When the side fences 32 and the end fences 30 are displaced enough times to align the sheets, the distance between the side fences 32 is set to W, the jogger operation of the side fences 32 and the end fences 30 is ended, and the sheet alignment is ended. . The amount of displacement of the end fence 30 in the direction A is determined so that the sheet occupies the re-feeding position in accordance with the size of the sheet detected by the detecting means. Is detected.

The discharge tray 6 and the end fence 30 then return to their original positions. In this state, the feed roller 97 and the feed roller 39 operate to move the paper stacked on the duplex tray 7 to the printing position 4. Supply is started. The feeding roller 97 feeds the uppermost one of the unprinted sheets, which are stacked on the double-sided tray 7, with the unprinted surface facing downward, toward the feed roller 39. A sheet formed by the upper guide plate 13 and the lower guide plate 14 is conveyed by the conveyance rollers 41 while the unprinted surface is turned upside down by the conveyance rollers 41, and cuts out from the notch formed in the lower guide plate 14. It enters the transport path and hits the feed roller 11. The feed roller 11 sends the sheet to the printing position 4 at a predetermined timing synchronized with the rotation of the printing drum 2. On the paper, printing is performed on the back surface opposite to the front surface printed when the paper is sent from the paper supply table 5. The printed sheets are stacked on the discharge tray 6.

The structures of the slider, the sheet conveying member, the notch, the slide plate, the holding member and the like are not limited to those described above, but may be as shown in FIG. Parts different from those described above will be described with reference to FIG. 24, and the remaining parts will be denoted by the reference numerals. In this case, the guide member 4
3 is not necessary, and the slider 106 'slides in a notch 42' formed in the upper plate 28 'and having a different shape from the notch 42 described above. Slider 10
6 'is a base 106a' located in the notch 42 '.
And the A of the base 106a 'at the end of the base 106a' in the A direction.
A support portion 106b 'extending in the direction, and a base portion 106a'.
And a pair of support portions 106c 'provided above the base portion 106a' near the end in the B direction. The support portion 106b 'is a rectangular flat plate, the end in the B direction is integral with the base 106a', the width in the C direction is narrower than the base 106a ', and one of the side surfaces is flush with the base 106a'. However, the other has a step with respect to the base 106a '. The support portion 106b 'is also formed by a protrusion 106d' protruding toward the end in the A direction on a surface having a step with respect to the base 106a 'and a protrusion 106d' on a surface having a step with respect to the base 106a '. Also has an engaging portion 106e 'formed to bend with respect to the upper edge on the B direction side.

The sheet conveying member 102 ′ is
a leg 102c 'formed by bending the flat portion 102b so as to be located on the side of the base portion 106a' having a step with respect to the base portion 106a ', and a tip of the leg 102c' A pair of rollers 102d 'rotatably supported on the opposite side of the support portion 106b',
A hole 102e 'formed near the flat plate portion 102b of c'
And a concave portion 102 formed on one side edge of the leg portion 102c '.
f ′.

By fitting the projection 106d 'into the hole 102e', the sheet transporting member 102 'is rotatably integrated with the slider 106'. A spring 103 as an elastic body is attached to the tip of the protrusion 106d 'fitted in the hole 102e'. One end of the spring 103 is the concave portion 102
f ', the other end of which engages with the lower side of the engaging portion 106e', whereby the sheet conveying member 102 '
Is biased in a direction in which it comes into contact with the support portion 106b '. When the flat plate portion 102b is in contact with the support portion 106b ', the contact surface 102a is substantially flush with the upper surface of the base portion 106a and is substantially parallel to the sheet placing surface 33. This state is referred to as a first state of the sheet conveying member 102 '. Further, the sheet conveying member 102 ′ is
a may take a position substantially perpendicular to the paper placing surface 33,
This attitude is called a second attitude. The sheet conveying member 102 'can be raised and lowered between a first position and a second position.

The slider 106 'also has a support 106
The slide plate 104 'for holding the position b' in the notch 42 'and the holding member 105'
6 ', the slide plate 104' and the holding member 105 'are integrally provided so as to sandwich the top plate 28'. The slide plate 104 'is a curved plate spring as an elastic body, and has a flat plate portion 104a' and two protrusions 104b 'slidingly contacting the lower surface of the upper plate 28'.
At least the protruding portion 104b 'is subjected to a process for reducing friction between the protruding portion 104b' and the upper surface plate 28 '. Holding member 105 '
Is for holding the slide plate 104 'so as to expose at least a part of the projection 104b' and sandwiching the slide plate 104 'between the upper plate 28'.

The slide plate 104 'and the holding member 105' respectively have holes 104c 'and 105 communicating with each other.
a ′ are provided in two sets. Each hole 104c ', 105
a 'is inserted with screws 107' and 107 '
Since the tips of 7 ′ and 107 ′ engage with the slider 106 ′, the slide plate 104 ′ and the holding member 105
06 ′. Therefore, slide plate 1
04 'is pressed against the upper plate 28' by the holding member 105 'by the urging action of the screw 107' and the slide plate 104 'itself.

On the sheet mounting surface 33 of the upper plate 28 ', the first
In order to avoid interference between the flat portion 102b of the sheet conveying member 102 'and the sheet, the concave portion 108 for receiving the flat portion 102b is formed. As described above, the sheet conveying member 102 'is integrated with the end plate 27 via the slider 106', and can be displaced in the AB direction parallel to the notch 42 'by the end plate displacing means. ing. The top plate 28 '
02d 'has one cam surface 109' that can be engaged. The cam surface 109 ′ is provided on the sheet placement surface 3 with respect to the concave portion 108.
On the side opposite to 3, the notch 42 'is formed on the side corresponding to the surface of the support portion 106b' having a step with respect to the base portion 106a '. The cam surface 109 'extends to a position adjacent to the duplex tray 7.

An engaging member 110 capable of engaging with the roller 102d 'is provided on the end side in the direction B of the cam surface 109', and the cam surface 112 of the engaging member 110
When 2 'is in the transport path, it is continuous with the cam surface 109'. Therefore, the sheet transport member 10
2 ′ is displaced in the A direction, and the roller 102d ′ becomes the cam surface 112.
When the sheet conveying member 102 ′ takes the second position from the first position by riding on the vehicle, and further displaces in the A direction after the sheet conveying member 102 ′ takes the second position, the roller 102d ′ The paper transport member 102 'moves on the cam surface 109' continuous with the cam surface 112, and the
You can keep moving in the direction. Paper transport member 10
The end point of the movement of the 2 ′ in the direction A is that the flat plate portion 102b and a part of the leg portion 102c ′ have the double-sided tray 7 shown in FIG.
This is a position where it has entered the first notch 45 formed at the bottom.

In the above description, the case in which the sheet conveying member can be raised and lowered has been described. However, in the configuration in which the sheet conveying member is raised and lowered, when the sheet on the discharge tray 6 is transferred onto the double-sided tray 7, the sheet is not conveyed. In order to raise the member, it is necessary to temporarily displace the end plate 27 displaced in the direction A in the direction B. In the following, in order to eliminate the process of temporarily displacing the end plate 27 in the direction B, the sheet transport member is moved relative to the end plate 27 by the end plate 2.
7 shows a configuration in which a relative movement is possible on the double-sided tray 7 side.

As shown in FIG. 25 or 26, the end plate 27 is movable with respect to the mounting table 28 by the slider 113. Place the slider 113 on the mounting table 28
The structure that enables the movement with respect to the notch 4 is not limited to the mechanism using the guide member 43 and the notch 42 described above.
A mechanism using 2 ′ may be used, and the shape of the slider 113 can be selected according to the mechanism. The end plate 27 is integrated with the slider 113 so as to be rotatable around the pin 99 in the same configuration as described above. A pinion 115 and a gear 116 that rotate about a shaft 114 are provided above the slider 113. Gear 11
6 includes a pinion 11 rotatably supported by a slider 113 by a shaft 117 located below the shaft 114.
8 are engaged. The pinion 115, the gear 116 and the pinion 118 constitute a driving member.

The end plate 27 has a sheet conveying member 1
Reference numeral 19 is supported from below by supporting means (not shown). This supporting means supports the sheet transport member 119 so as to be displaceable in the AB direction with respect to the end plate 27. The sheet conveying member 119 is flush with the front surface 27c of the end plate 27 in the state shown in FIG.
A flat portion 119b having a flat portion 9a; and a supporting portion 119c which supports the flat portion 119b and is supported by the supporting means. A rack as a second rack engaging with the pinion 115 is provided on the upper edge of the supporting portion 119. 119d are formed. As shown in FIG. 26, a rack 120 serving as a first rack as an engaging member is arranged near the end of the mounting table 28 in the direction A so as to engage with the pinion 118. The rack 120 is provided on the mounting surface 33 in a plate path in which the end plate 27 is displaced by the end plate displacing means.

Accordingly, in the state shown in FIG. 27 corresponding to the state shown in FIG. 15, when the end plate displacing means displaces the end plate 27 in the direction A, the pinion 118 engages with the rack 120 as shown in FIG. At this point, the pinion 118 starts rotating, and this rotation
16 to the pinion 115 and the pinion 11
5 is engaged with the rack 119d, thereby displacing the sheet conveying member 119 in the A direction. That is, the sheet transport member 1
Reference numeral 19 further displaces in the A direction relative to the end plate 27 displaced in the A direction. Paper transport member 11
9 is the contact surface 1 with the displacement of the end plate 27.
19a is in contact with the edge of the sheet in the B direction,
19b and a part of the support portion 119c enter the double-sided tray 7, and are displaced in the A direction until the sheet occupies the refeeding position. The end plate displacement means stops the displacement of the end plate 27 in the direction A at the position where the sheet occupies the re-feeding position in accordance with the detected size of the sheet. The sheet alignment operation on the double-sided tray 7 can be the same as that described above.

In order to eliminate the process of temporarily displacing the end plate 27 in the direction B, the configuration in which the paper transport member can be moved relative to the end plate 27 toward the double-sided tray 7 of the end plate 27 includes a rack The present invention is not limited to the above configuration using an AND pinion, but may be a configuration using a link mechanism as shown in FIG. FIG.
The link mechanism shown in FIG. 1 is called an expansion joint or a tongue, and is displaced so as to extend in the direction A by giving a displacement in a direction shown by an arrow D and / or an arrow E. When a displacement is given, the whole is contracted in the B direction to be displaced.

FIGS. 30 to 33 show an example in which such a link mechanism is used as a driving member of a sheet conveying member. The end plate 27 is movable with respect to the mounting table 28 by the slider 121. Place the slider 121 on the mounting table 2
8 can be moved with respect to the guide member 43 described above.
And the mechanism using the notch 42, the notch 4
A mechanism using 2 ′ may be used, and the shape of the slider 121 can be selected according to the mechanism. The end plate 27 is integrated with the slider 121 so as to be rotatable around the pin 99 in the same configuration as described above.

On the end plate 27, a plate-shaped paper conveying member 122 is provided with a driving member 1 having the above-described link mechanism.
23. The driving member 123 supports the sheet conveying member 122 so as to be displaceable in the AB direction with respect to the end plate 27. Paper transport member 122
30 has a contact surface 122a flush with the front surface 27c of the end plate 27 in the state shown in FIG. 30, and a groove 122b formed in the vertical direction. Of the four ends 123a, 123b, 123c, and 123d of the drive member 123, the ends 123a and 123b on the A direction side are integrated with the sheet conveying member 122, and the ends 123c and 123 on the B direction side.
d is integrated with the end plate 27. Of the ends 123a and 123b on the A direction side, the upper end 123a is rotatably coupled to the sheet conveying member 122, and the lower end 124b is slidably supported by the groove 122. Of the end portions 123c and 123d on the B direction side, the upper end portion 123c is rotatably coupled to the end plate 27, and the lower end portion 123d slides in a groove 27d formed in the end plate 27 in the vertical direction. It is movably supported. The end 123d has an arm 124 extending downward.
Are rotatably connected, and a roller 125 is rotatably fixed to the lower end of the arm 124. Contact surface 122
a is flush with the front surface 27c and the end 123
b and 123d are located at the lower ends of the grooves 122b and 27d, respectively. The mounting table 28 has a front surface 2
A cam 126 is provided as an engaging member capable of engaging with the roller 125 in a state flush with 7c. Cam 1
Reference numeral 26 denotes a cam surface 126a inclined upward toward the downstream in the direction A.
have.

Therefore, in the state shown in FIG. 30 corresponding to the state shown in FIG. 25, when the end plate displacement means displaces the end plate 27 in the direction A, FIG.
As shown in FIG. 32, the roller 125 engages with the cam surface 126a, and as shown in FIGS.
4 is displaced upward so that the end 12
When 3d rises along the groove 27d, a displacement in the direction E shown in FIG. 29 is given, and the sheet conveying member 122 is displaced in the A direction. That is, the sheet transport member 122 is further displaced in the A direction relative to the end plate 27 displaced in the A direction. The sheet transport member 122 is provided with the end plate 2
With the displacement of the sheet 7, the sheet enters the double-sided tray 7 with the contact surface 122a contacting the edge of the sheet in the direction B, and is displaced in the direction A until the sheet occupies the refeeding position. The end plate displacement means stops the displacement of the end plate 27 in the direction A at the position where the sheet occupies the re-feeding position in accordance with the detected size of the sheet. The sheet alignment operation on the double-sided tray 7 can be the same as that described above.

As shown in FIG. 33, the driving means 123
The state of engagement with the sheet conveying member 122 and the end plate 27 may be upside down as described above.
The example shown in FIG. 33 is the end portions 123a and 123b on the A direction side.
The upper end 123a is the groove 1 of the sheet conveying member 122.
22b slidably supported by the lower end 124
b is fixed and the end 123 on the B direction side
The upper end 123c of the end plates c and 123d is slidably supported by the groove 27d of the end plate 27, and the lower end 123d is fixed. The arm 123 is rotatably connected to the end 123c. When the contact surface 122a is flush with the front surface 27c, the ends 123a and 123c are located at the upper ends of the grooves 122b and 27d, respectively. The cam 126 'has a cam surface 126a' inclined downward toward the downstream in the direction A.

Accordingly, when the end plate displacing means displaces the end plate 27 in the direction A, the roller 125 engages with the cam surface 126a 'as shown in FIG. ), The arm 124
Is displaced downward, and the end 123c descends along the groove 27d, giving a displacement in the direction D shown in FIG.

Although the embodiment has been described above, the stencil printing apparatus 1
The configuration of each of the above-described devices and the like and the arrangement state thereof are as follows.
This is merely an example, and other known devices and various arrangements may be used. For example, the stencil printing apparatus 1 is not limited to the above-described thermosensitive digital stencil making integrated type stencil printing apparatus, and the master may be discharged by a plate discharging device provided separately from the apparatus main body. The device 8 does not necessarily have to be provided in the device main body. The data for plate making may be data read by the document reading device as described above, or data created by a computer or the like. In addition, multi-color printing including full-color printing can be performed as a double-cylinder type in which two or more plate cylinders are arranged in parallel,
As the printing paper, in addition to ordinary paper, thick paper, an envelope, and the like can be used.

Further, a post-processing device such as a collator or a sorter can be used as the printing device 1. The normal mode button is not necessarily required, and only the duplex mode button is provided.Printing in the duplex mode is performed only when the duplex mode button is pressed.When printing is started without pressing the duplex mode button, the normal mode is set. Printing may be performed. The pressing means may be a press roller instead of the impression cylinder. What is shown as the elastic member may be a spiral spring or a leaf spring.

Further, in the above embodiment, the case where the printing apparatus is a stencil printing apparatus has been described, but another type of printing apparatus can be used as the printing apparatus. As an example of another type of printing apparatus, a single plate making apparatus that performs plate making such that a master having two sides is not penetrated by a thermal head is used, and the plate is mounted on two plate cylinders arranged opposite to each other. A printing device to be wrapped around a cylinder may be used. Note that a printing apparatus that performs plate making to the extent that it does not penetrate the master with the front and back by the thermal head is disclosed in Japanese Patent No.
No. 790963.

[0080]

According to the first aspect of the present invention, in a printing apparatus which prints on a sheet at a printing position and has a discharge tray for loading the printed sheet, the printing apparatus is loaded on the discharge tray. It has a double-sided tray for receiving and stacking the paper, transporting the stacked paper toward the printing position and performing double-sided printing, and the discharge tray is configured to transfer the paper stacked on the discharge tray to the above-described position. For transporting on a double-sided tray,
Since at least a part of the sheet has a sheet conveying member capable of entering the above-mentioned double-sided tray, in a printing apparatus provided with the double-sided tray, the sheet is discharged without protruding the end fence provided on the double-sided tray toward the sheet discharging tray. It is possible to provide a printing apparatus capable of conveying the paper on the tray to the double-sided tray.

According to a second aspect of the present invention, in the printing apparatus according to the first aspect, the discharge tray receives an end plate for receiving a leading end of a sheet conveyed from the printing position, and the end plate is connected to the end plate. End plate displacement means for displacing toward the double-sided tray, wherein the paper transport member is disposed integrally with the end plate, and the end plate displacement means displaces the paper transport member integrally with the end plate. Therefore, it is possible to provide a printing apparatus capable of transporting the paper on the discharge tray to the double-sided tray by displacing the paper transport member integrally with the end plate by the end plate displacement means.

According to a third aspect of the present invention, in the printing apparatus according to the second aspect, the paper transport member has a contact surface that comes into contact with the paper, and the abutment surface is a paper of the paper discharge tray. The first position, which is substantially parallel to the placing surface, and the second position, in which the contact surface is substantially perpendicular to the sheet placing surface, can be raised and lowered. Since the contact surface comes in contact with the paper and transports the paper onto the double-sided tray when taking the paper, the paper transport member is disposed downstream of the end plate in the paper transport direction, and the paper transport member is moved by the end plate displacement means. By displacing integrally with the end plate, it is possible to provide a printing apparatus capable of transporting the paper on the discharge tray to the double-sided tray by the paper transport member in the second position.

According to a fourth aspect of the present invention, in the printing apparatus according to the third aspect, the paper discharge tray is an engagement member that is capable of moving forward and backward in a transport path in which the paper transport member is displaced by the end plate displacement means. The paper transport member takes the second position by engaging with the engaging member located in the transport path, so that the paper transport member is integrated with the end plate by end plate displacement means. A printing apparatus capable of transferring the sheet on the sheet discharge tray to the double-sided tray by the sheet conveying member in the second position by displacing the sheet conveying member in the second position. be able to.

According to the fifth aspect of the present invention, in the printing apparatus according to the fourth aspect, since the printing apparatus has the engagement member driving means for moving the engagement member forward and backward to the transport path, the paper is transported by the paper transport member. Only when the sheet is conveyed, the engaging member enters the conveying path, and the sheet conveying member is set in the second position.
It is possible to provide a printing apparatus capable of transporting the paper on the paper discharge tray to the double-sided tray by the paper transport member in the position.

The invention according to claim 6 is the invention according to claim 4 or 5
In the printing apparatus described above, since the engagement member has a cam surface that engages with the paper conveyance member, the printing apparatus can smoothly displace the paper conveyance member between the first and second positions with a simple configuration. Can be provided.

According to a seventh aspect of the present invention, in the printing apparatus according to any one of the third to sixth aspects, the sheet transport member and the sheet which take the first position on the sheet placement surface. In order to avoid interference with the paper transport member, the concave portion for receiving the paper transport member is formed, so that the paper transport member does not interfere with the paper when the paper is transported by the end plate,
It is possible to provide a printing apparatus that can prevent the sheet alignment from being disturbed before the sheet is transported to the double-sided tray.

According to an eighth aspect of the present invention, in the printing apparatus according to the second aspect, the paper transport member is movable relative to the end plate toward the double-sided tray of the end plate. It is possible to provide a printing apparatus capable of transporting a sheet onto the double-sided tray by moving the end plate to the double-sided tray only once.

According to the ninth aspect of the present invention, in the printing apparatus according to the eighth aspect, the discharge tray is provided with an engagement provided in a plate path in which the end plate is displaced by the end plate displacement means. A driving member disposed integrally with the end plate and driving the paper transport member toward the double-sided tray of the end plate, wherein the end plate is moved to the double-sided tray by the end plate displacing means. When the drive member is engaged with the engagement member when displacing the paper feed member, the paper transport member is displaced toward the double-sided tray side of the end plate. A printing device that can transport paper onto the duplex tray only by moving to the duplex tray once It can be provided.

According to the tenth aspect, the ninth aspect is provided.
In the printing apparatus described above, the engaging member is a first rack, the driving member has a pinion that can be engaged with the first rack, and the paper transporting member is a second rack that is engaged with the pinion. A printing device that has a rack so that the paper transport member can be driven to the double-sided tray side of the end plate with a simple configuration, and the paper can be transported onto the double-sided tray only by moving the end plate to the double-sided tray side once. Can be provided.

According to the eleventh aspect, the ninth aspect is provided.
In the printing apparatus described above, the engaging member is a cam,
Since the drive member has a link mechanism that can be engaged with the cam, and the paper transport member is integral with the link mechanism, the paper transport member can be driven to the two-sided tray side of the end plate with a simple configuration. In addition, it is possible to provide a printing apparatus that can convey a sheet onto the double-sided tray by moving the end plate to the double-sided tray only once.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a stencil printing apparatus to which the present invention is applied.

FIG. 2 is a schematic side view of the paper discharge tray shown in FIG.

FIG. 3 is a schematic plan view showing an internal configuration of a paper discharge tray shown in FIG.

FIG. 4 is a partial perspective view of a top plate of a paper discharge tray.

FIG. 5 is an exploded perspective view of an end plate, a slider, a sheet conveying member, and the like.

FIG. 6 is an assembled perspective view of each configuration shown in FIG. 5;

FIG. 7 is a partial plan view of a paper discharge tray showing an engagement member and an engagement member driving unit.

FIG. 8 is a schematic plan view of a double-sided tray.

FIG. 9 is a schematic plan view showing the internal configuration of a double-sided tray.

FIG. 10 is a schematic perspective view showing end fence displacement means.

FIG. 11 is a schematic side view of a discharge tray.

FIG. 12 is a schematic plan view illustrating a state in which an engagement member has entered a conveyance path of a sheet conveyance member.

FIG. 13 is a perspective view showing a state in which the sheet conveying member is engaged with the engaging member and is in the second position.

FIG. 14 is a schematic side view showing the printing apparatus in a state where sheets are discharged to a discharge tray.

FIG. 15 is a schematic side view illustrating the printing apparatus in a first state when paper is conveyed to a paper re-feeding position, that is, a state in which a paper mounting surface of a discharge tray is flush with a paper mounting surface of a double-sided tray; FIG.

FIG. 16 is a partially enlarged plan view showing a state in which the engagement member is retracted from the conveyance path of the sheet conveyance member in the first state.

FIG. 17 is a schematic side view showing a second state when the paper is transported to the re-feeding position, that is, a state in which the end plate transports the paper toward the double-sided tray.

FIG. 18 is a schematic side view showing a third state when a sheet is conveyed to a paper re-feeding position, that is, a state in which an end plate is once retracted.

FIG. 19 is a partially enlarged plan view showing a state in which the engagement member has entered the conveyance path of the sheet conveyance member in the third state.

FIG. 20 is a schematic side view showing a fourth state when a sheet is conveyed to the paper re-feeding position, that is, a state in which the sheet conveying member shifts from the first state to the second state.

FIG. 21 is a schematic side view illustrating a fifth state in which the paper is transported to the paper re-feeding position, that is, a state in which the paper transport member transports the paper onto the double-sided tray.

FIG. 22 is a schematic perspective view showing a sixth state when the sheet is conveyed to the paper re-feeding position, that is, a state in which the end plate and the sheet conveying member return to the original state and the end fence is raised.

FIG. 23 is a schematic side view showing a seventh state when the sheet is transported to the re-feeding position, that is, a state in which the end plate has transported the sheet to the re-feeding position.

FIG. 24 is an exploded perspective view of another example of an end plate, a slider, a sheet conveying member, and the like.

FIG. 25 is a partial side view of a sheet discharge tray having a configuration in which a sheet conveying member is displaced toward a two-sided tray of an end plate.

FIG. 26 is a partial side view of the sheet discharge tray in a state where the sheet conveying member is displaced toward the two-sided tray of the end plate.

FIG. 27 is a schematic side view of the printing apparatus in which the configuration shown in FIG. 25 is in a state corresponding to the state shown in FIG.

FIG. 28 is a schematic side view of the printing apparatus in which the configuration shown in FIG. 25 is in a state corresponding to the state shown in FIG. 21;

FIG. 29 is a schematic plan view illustrating the concept of a link mechanism applied to the embodiment.

FIG. 30 is a partial side view of a sheet discharge tray having a configuration employing a link mechanism in which a sheet conveying member is displaced to a two-sided tray side of an end plate.

FIG. 31 is a partial side view of the sheet discharge tray in a state where the sheet conveying member is displaced toward the two-sided tray side of the end plate in the configuration shown in FIG. 30;

FIG. 32 is a schematic side view illustrating a state of displacement of a sheet conveying member by a link mechanism.

FIG. 33 is a schematic side view showing an application example according to another mode of the link mechanism.

[Description of Reference Numerals] 1 printing device 4 printing position 6 paper discharge tray 7 double-sided tray 27 end plate 33 paper placement surface 50 to 57 end plate displacement means 102, 102 ', 119, 122 paper transport members 102a, 119a, 122a Contact surface 108 Recess 110 Engagement member 111 Engagement member driving means 112 Cam surface 113 First rack 113, 120, 126, 126 ′ as engagement member Engagement member 115, 116, 118 Driving member 119d Second rack 123 Link mechanism 126, 126 ′ as drive member Cam as engagement member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B65H 85/00 B65H 85/00

Claims (11)

[Claims] A printing apparatus that prints on a sheet at a printing position and has a paper discharge tray for loading the printed paper, receives and stacks the paper loaded on the paper discharge tray, and loads the loaded paper. Has a double-sided tray for carrying double-sided printing by transporting the paper toward the printing position, and the paper discharge tray has a double-sided tray for transporting the paper stacked on the paper discharge tray to the double-sided tray. A printing apparatus characterized in that at least a part of the printing apparatus has a sheet conveying member that can enter the double-sided tray. 2. The printing apparatus according to claim 1, wherein the discharge tray receives an end of a sheet conveyed from the printing position, and an end plate that displaces the end plate toward the double-sided tray. A printing apparatus, comprising: plate displacing means, wherein the paper transport member is disposed integrally with the end plate, and wherein the end plate displacing means displaces the paper transport member integrally with the end plate. . 3. The printing apparatus according to claim 2, wherein the sheet transport member has a contact surface that contacts the sheet, and the contact surface is substantially parallel to a sheet placement surface of the discharge tray. The first attitude and the second attitude in which the abutment surface is substantially perpendicular to the sheet placement surface can be raised and lowered, and when the second attitude is taken, the abutment surface is moved up and down. A printing apparatus, wherein the printing apparatus contacts a sheet and conveys the sheet onto the double-sided tray. 4. The printing apparatus according to claim 3, wherein the paper discharge tray has an engaging member that can move forward and backward in a transport path in which the paper transport member is displaced by the end plate displacement means. The printer according to claim 1, wherein said printer takes a second position by engaging said engaging member located in said transport path. 5. The printing apparatus according to claim 4, further comprising an engaging member driving means for moving said engaging member into and out of said transport path. 6. A printing apparatus according to claim 4, wherein said engaging member has a cam surface which engages with said sheet conveying member. 7. A printing apparatus according to claim 3, wherein said printing means is provided on said paper mounting surface to prevent interference between said paper transport member in a first position and said paper. A printing apparatus, wherein a concave portion for receiving the sheet conveying member is formed. 8. The printing apparatus according to claim 2, wherein the paper transport member is movable relative to the end plate toward the double-sided tray of the end plate. 9. The printing apparatus according to claim 8, wherein the discharge tray is formed integrally with an engaging member disposed in a plate path in which the end plate is displaced by the end plate displacing means. A driving member for driving the paper transporting member to the side of the both-side tray of the end plate, wherein the driving is performed when the end plate is displaced toward the two-sided tray by the end plate displacing means. A printing apparatus, wherein a member is engaged with the engaging member, so that the sheet conveying member is displaced toward the double-sided tray of the end plate. 10. The printing apparatus according to claim 9, wherein said engaging member is a first rack, said driving member has a pinion engageable with said first rack, and said paper transporting member is A printing device comprising a second rack engaged with a pinion. 11. A printing apparatus according to claim 9, wherein said engaging member is a cam, said driving member has a link mechanism capable of engaging with said cam, and said paper conveying member is said link mechanism. A printing device characterized by being integral with the printing device.