JP3939786B2 - Stencil printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printing apparatus of a simultaneous double-sided printing method for simultaneously printing both sides of a printing paper.
[0002]
[Prior art]
Conventionally, in order to reduce the consumption of printing paper, double-sided printing, which performs printing on both front and back sides of printing paper, has come to occupy most of the printing. For this purpose, an attempt has been made to develop an apparatus for obtaining a double-sided printed material by passing the printing paper in such a manner that the two printing cylinders are arranged facing each other and the printing cylinders are pressed against each other via the printing paper. Techniques for performing double-sided printing by passing the printing paper once through the printing apparatus in this way are disclosed in, for example, (1) JP-A-6-71996, (2) JP-A-8-25780, etc. There is something that was done.
[0003]
In the above publication (1), a printing drum that has a base paper locking device for mounting a stencil base paper on the outer peripheral surface and is rotatably held, and an inner periphery of the printing drum provided inside the printing drum. An ink supply device for supplying ink to the surface, and a stencil discharging device for stripping and storing used stencil paper from the printing drum, and while rotating the printing drum with the stencil paper mounted on the outer peripheral surface, A printing device that performs printing by transferring the ink supplied from the ink supply device to the printing paper from the perforating portion of the stencil paper by moving the printing paper through the stencil paper while contacting the outer peripheral surface. The stencil plate newly provided on each of these printing apparatuses is provided on the front side and the back side of the printing paper across the transport path of the printing paper at the time of printing. The paper sequentially stencil printing apparatus in which each sheet engaging plate-making and plate feeder for supplying the device is provided is disclosed.
[0004]
In the stencil printing apparatus disclosed in the above publication (1), only one plate making / plate feeding apparatus is provided in common for the upper and lower printing apparatuses. In the stencil printing apparatus disclosed in the publication (2), a plate making / plate feeding apparatus is provided in each of the upper and lower printing apparatuses. Both of these stencil printing machines (1) and (2) enable double-sided printing, and there is no hassle of printing the front and back surfaces of printing paper separately over time, so that printing can be performed once. Thus, the front, back and both sides of the printing paper can be printed in a short time.
[0005]
[Problems to be solved by the invention]
However, in any of the above stencil printing apparatuses (1) and (2), in double-sided printing, out of printing preparation processes such as plate removal, original reading, plate making, wrapping a base paper around a printing drum, and trial printing, original reading and plate making Is a conventional stencil printing apparatus with a single-sided printing method, in which the plate-making process is continuously performed in time series, for example, the plate-making for the back side of the document is performed after the plate-making for the surface of the document is completed. Compared to the above, a new problem has arisen that the time required for a series of printing preparation steps (so-called first print time) takes twice as long even by simple calculation.
[0006]
Further, although there is no direct relation with the techniques disclosed in the above publications (1) and (2), when there are images on both sides of a document, a reading sensor device is provided on both sides so as to hold the document, and each reading sensor device is provided. If the image data read in step 1 is sent to each plate-making and plate-feeding device for the front and back sides, and plate-making and plate-feeding are performed at the same time, the printing preparation process takes the same time as a conventional single-sided stencil printing machine. However, since the number of reading sensor devices is increased by one, the cost is increased by that amount. Further, considering the ratio of originals to be used, double-sided image originals are overwhelmingly small, and single-sided image is also increased. In the case of a manuscript, even if there are reading sensor devices on both sides of the manuscript, it does not make sense, and it becomes increasingly difficult to cost.
[0007]
An object of the present invention is to provide a stencil printing apparatus capable of shortening the first print time in double-sided printing as much as possible while suppressing an increase in apparatus cost.
[0008]
[Means for Solving the Problems]
  In order to achieve the object, the present invention has the following configuration.
(1) A printing drum having a base paper locking device for mounting a stencil paper on its outer peripheral surface and rotatably held, and provided inside the printing drumTheInk supply device for supplying ink to the inner peripheral surface of the printing drum, plate discharging device for stripping and storing used stencil paper from the printing drum, and plate making for supplying newly made stencil paper to the base paper locking device -Having a plate feeding device,
  The ink supplied from the ink supply device is moved by bringing the printing paper into contact with the outer peripheral surface through the stencil paper while rotating the printing drum with the stencil paper mounted on the outer peripheral surface. Printing devices that perform printing by transferring to the printing paper from the perforation portion of the stencil paper are provided on the front side and the back side of the printing paper across the transport path of the printing paper at the time of printing.AndThe stencil sheet peeling position from the printing drum by the plate removal device and the base paper supply position to the printing drum by the plate making / plate feeding device are provided at symmetrical positions with the transport path as a symmetry axis, respectively.The plate making / plate feeding apparatus has a reading sensor device for reading one side of a document and has a function of reading another side using a document reversing device when reading a double-sided document according to image data of the document from a document reading unit. Storing image data obtained by reading one-sided image data of a two-sided document or one-sided document of either one of two-sided documents read by the document reading unit; A stencil printing apparatus having storage means for outputting to the plate making / plate feeding apparatus at an appropriate time, the image data of one image of one double-sided original or two single-sided originals by the original reading unit Is stored in the storage means, and an image of the other one side of the double-sided document or the remaining one-sided document is read, and the plate making is performed by one plate making apparatus based on the image data of the document. Then, another plate-making apparatus is driven by image data stored in the storage means over the plate-making operation time, and plate-making is performed, with the conveying path of the printing paper at the time of printing arranged oppositely. Processes for plate making / plate feeding devices in parallel for each printing device(Claim 1).
(2) A printing drum which has a base paper locking device for mounting a stencil base paper on its outer peripheral surface and is rotatably held, and supplies ink to the inner peripheral surface of the printing drum provided inside the printing drum. An ink supply device, a plate discharging device for stripping and storing used stencil paper from the printing drum, and a plate making / plate feeding device for supplying a newly made stencil paper to the base paper locking device,
  The ink supplied from the ink supply device is moved by bringing the printing paper into contact with the outer peripheral surface through the stencil paper while rotating the printing drum with the stencil paper mounted on the outer peripheral surface. Printing devices that perform printing by transferring to the printing paper from the perforation part of the stencil paper are provided on the front side and the back side of the printing paper across the transport path of the printing paper at the time of printing, respectively. The stencil sheet peeling position from the printing drum by the plate removing device and the stencil sheet feeding position to the printing drum by the plate making / plate feeding device are provided at symmetrical positions with the transport path as a symmetry axis, respectively. The plate making / plate feeding apparatus has a reading sensor device for reading one side of a document and reads the other side using a document reversing device when reading a double-sided document. Plate making in accordance with image data of a document from a document reading unit having a function, and one-sided document of either one of two-sided document or two-sided document read by the document reading unit A stencil printing apparatus having storage means for storing image data when reading the image data and outputting the image data to the plate making / plate feeding apparatus in a timely manner, and images on both sides of the printing paper as well as one double-sided document When the double-sided printing is performed, the reading sensor device is fixed at a home position, the double-sided document is transported, and the reading sensor device reads the image on one side of the document by scanning. When the scanned image data is stored and the trailing edge of the document passes through the scanning sensor device, the single-sided image data stored in the storage means Based on this, the plate making operation is started immediately by one plate making / plate feeding device. At the same time, the original is reversed by the reversing device, and then the original is fixed and the reading sensor device is synchronized with the plate making speed. By scanning at a speed, another plate making / plate feeding device is used while reading the image on the other side. The plate operation is performed (claim 2).
(3) A printing drum having a base paper locking device for mounting a stencil base paper on the outer peripheral surface and rotatably held, and supplying ink to the inner peripheral surface of the printing drum provided inside the printing drum An ink supply device, a stencil discharging device for stripping and storing used stencil paper from the printing drum, and a stencil making and feeding device for supplying newly stencil paper to the base paper locking device, and With the stencil sheet mounted on the surface, the printing drum is rotated while the printing drum is rotated, and the printing paper is moved while being in contact with the outer peripheral surface, whereby the ink supplied from the ink supply device is moved to the stencil sheet. Printing devices that perform printing by transferring to the printing paper from the perforation section of the printing paper are respectively provided on the front side and the back side of the printing paper across the transport path of the printing paper at the time of printing. The stencil sheet stripping position from the printing drum by the plate discharging device and the base paper supply position to the printing drum by the plate making / plate feeding device are provided at symmetrical positions with the transport path as a symmetry axis, respectively. The plate making / plate feeding apparatus has a reading sensor device for reading one side of a document and has a function of reading the other side using a document reversing device when reading a double-sided document, according to image data of the document from a document reading unit. Storing image data obtained by reading one-sided image data of a two-sided document or one-sided document of either one of two-sided documents read by the document reading unit; A stencil printing apparatus having storage means for outputting to the plate making / plate feeding apparatus in a timely manner, from two single-sided documents having images only on one side to one sheet When performing double-sided printing for forming images on both sides of the printing paper, the reading sensor device is fixed at the home position, one of the two originals is transported, and the reading sensor device provides one of the documents. The image data read by the storage means is stored while reading the image of the eye original by scanning, the rear end portion of the first original passes through the reading sensor device, and the second original is the reading sensor. When the apparatus reaches the apparatus, a plate-making operation based on the image data stored in the storage means is started by one plate-making / plate-feeding device, and at the same time, the second original is placed with the reading sensor device fixed at the home position. The front of the reading sensor device is moved at a speed synchronized with the plate making speed, and the image is read by the reading sensor while the image is read by the other plate making / plate feeding device. The plate-making operation for the first document is performed in parallel with the plate-making operation for the first document (claim 3).
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(1) Configuration of stencil printing machine
As an example of the present invention, a stencil printing apparatus capable of simultaneous duplex printing will be described below.
In FIG. 1, a large number of printing papers 34 are placed on a paper feed tray 33, separated one by one and transported, printed on both sides in the middle of the transport, and sent to a paper discharge tray 40. . A number of conveying means are involved before the sheet is conveyed from the sheet feed table 33 to the sheet discharge table 40. The main components are a sheet feeding roller 35, a separation roller (upper) 36a, and a feed roller (upper). 37a, a conveyance belt 41, and the like. The feed roller 35 is supported so as to be swingable about the axis of the separation roller (upper) 36a, and the position of the feed roller 35 is detected by a sensor (not shown) so that the uppermost printing paper is always suitable for feeding. It is controlled to reach a height. As the paper feed proceeds, the position of the paper feed roller 35 is lowered, and when it is detected by a sensor (not shown), the paper feed tray 33 is controlled to rise by a predetermined amount.
[0017]
The separation roller (upper) 36 a rotates in conjunction with the paper feed roller 35. A separation roller (lower) 36b is opposed to the separation roller (upper) 36a, and the printing paper 34 is separated and sent out one by one by the rotation of the sheet feeding roller 35, the separation roller (upper) 36a, and the like. . The feed roller (upper) 37a and the feed roller (lower) 37b are opposed to each other and are separated into a single sheet by a separation unit including a separation roller (upper) 36a and a separation roller (lower) 36b, and are sent out. , The ink roller (upper) 44 and the ink roller (lower) 144 are fed out toward the printing unit 51 constituted by a nip formed between the printing drums 2 and 102. The printing paper 34 that has exited the printing unit 51 is sent to the transport belt 41, and is sent from the transport belt 41 to the paper discharge tray 40.
[0018]
Of such a path of the printing paper 34 from the paper feed tray 33 to the paper discharge tray 40, a path passing through the printing unit 51, that is, a feed roller (upper) 37a and a feed roller (lower) 37b in FIG. A line indicated by a broken line connecting the nip portion 37 </ b> N to the upper surface of the transport belt 41 is particularly referred to as a print paper transport path at the time of printing and denoted by reference numeral 50.
[0019]
In FIG. 1, a printing device (upper) 60 a is above the transport path 50, that is, the front side of the printing paper 34, and a printing device (lower) 60 b is below the transport path 50, that is, the back side of the printing paper 34. Each is provided at a symmetrical position with the conveyance path 50 as an axis of symmetry. The internal configuration of the printing device (upper) 60a and the printing device (lower) 60b is such that each component is arranged in a printing drum, such as an ink supply pipe, a doctor roller, an ink reservoir, and a plate discharging device or plate making / plate feeding device. Except for a part of, basically they are the same except that they are symmetrical to each other. Therefore, a part of the common configuration is replaced with the description of the printing apparatus (lower) 60b by the description of the configuration of the printing apparatus (upper) 60a. The components of the printing apparatus (lower) 60b whose description is omitted correspond to the names obtained by replacing (upper) with (lower) at the end of the names of the components of the printing apparatus (upper) 60a. Further, the (upper) code plus 100 is the (lower) code.
[0020]
The printing device (upper) 60 a includes at least a printing drum (upper) 2, a plate discharging device (upper) 4, and a plate making / plate feeding device (upper) 22. As shown in FIG. 3, the printing drum (upper) 2 has two drum flanges 47 facing each other with a gap therebetween. In FIG. 3, only the right drum flange is shown. These drum flanges 47 are pivotally supported on a support shaft (upper) 82. These drum flanges 47 have a shape such that a part of the disk is cut into a D shape, and a stage member 86 having a bent portion 86b at one end is screwed on the flat portion cut into the D shape. It is installed by the method of. On the stage member 86, two hook-shaped claw portions 86a, 86a are fixed at a predetermined interval.
[0021]
A porous support plate 83 is wound on the outer peripheral surface of the drum flange 47. The porous support plate 83 is made of a thin metal plate, has a large number of perforations on the surface, and has holes at positions corresponding to the claw portions 86a and 86a at the tip. These hole portions are hooked on the claw portions 86a and 86a, and the rear end portion is sandwiched between the peripheral surface of the drum flange 47 and the bent portion 86b. With this configuration, when the porous support plate 83 is stressed in the radial direction of the printing drum from the inside of the printing drum (upper) 2, the circumferential surface thereof easily swells from the circumferential surface of the drum flange 47. Is possible.
[0022]
Further, a mesh screen 89 is wound around the outer peripheral surface of the porous support plate 83 as shown in FIG. A thin plate-like attachment plate 89a is attached to one end side of the mesh screen 89, and a thin plate-like movable plate 89b is attached to the other end. The mounting plate 89a is fixed on the stage member 86 by screwing or the like, and the movable plate 89b is movably mounted on the stage member 86 via an elastic spring 89c. With this configuration, the mesh screen 89 can bulge from the peripheral surface of the drum flange 47 in the same manner as the porous support plate 83. On the stage member 86, there is provided a base paper locking device (upper) 28 that holds the tip of the heat-sensitive stencil base paper (upper) 23. The configuration of the printing drum (upper) 2 described with reference to FIG. 3 is also used in the printing drum (lower) 102 as it is. However, with respect to the printing drum (lower) 102, the shape and arrangement of the members are symmetrical to the printing drum (upper) 2 except for the ink supply pipe, the doctor roller, the ink reservoir, and the like.
[0023]
In the printing drum (upper) 2, an ink supply pipe (upper) 43, an ink supply roller (upper) 44, a doctor roller (upper) 45 and an ink for supplying ink to the inner peripheral surface of the porous support plate 83 are provided. An ink supply device (upper) 38 including a wedge-shaped ink reservoir (upper) 46 formed by a supply roller (upper) 44 and a doctor roller (upper) 45 is provided. Similarly, in the printing drum (lower) 102, an ink supply pipe (lower) 143, an ink supply roller (lower) 144, and a doctor roller (lower) for supplying ink to the inner peripheral surface of the porous support plate 183 are provided. 145 and an ink supply device (lower) 138 including a wedge-shaped ink reservoir (lower) 146 formed by an ink supply roller (lower) 144 and a doctor roller (lower) 145 are provided.
[0024]
The plate making / plate feeding device (upper) 22 includes support means (upper) 23a for supporting the stencil sheet (upper) 23, a thermal head (upper) 24, a platen roller (upper) 25, a cutter (upper) 30, , Feed rollers (upper) 26a and 26b, plate feeding rollers 27a and 27b, receiving box (upper) 31 and the like. In the vicinity of the peripheral surface of the printing drum (upper) 2, there is provided a paper discharge peeling claw 39 that peels off the front end side of the printed paper if it is wound around the printing drum due to the viscosity of the ink. The paper discharge peeling claw 39 can be swung, and can be brought into contact with and separated from the printing drum (upper) 2 by this swinging.
[0025]
The plate discharging device (upper) 4 includes a plate discharging belt (upper) 5a, a plate discharging roller (upper) 7a wound between a plate discharging roller (up) 5a, a plate discharging roller (up) 5b, and a plate discharging roller (up) 7b. Conveying means for the used stencil sheet (upper) 3 comprising a pair of wrapped stencil sheet belts 6b, a stencil box (upper) 8 for storing the used stencil sheet (upper) 3, and a used stencil sheet (upper) ) It is composed of a compression plate (upper) 9 etc. for compressing 3.
[0026]
The printing device (lower) 60 b includes at least a printing drum (lower) 102, a plate discharging device (lower) 104, and a plate making / plate feeding device (lower) 122. The structure of the printing drum (lower) 102 conforms to the configuration described with reference to FIG.
The center of the printing drum (upper) 2 is O, and the center of the printing drum (lower) 102 is O '. In the vicinity of the portion 62 where the line connecting the nip portion between the nip portion of the discharged plate peeling roller (upper) 5a and the discharged plate peeling roller (upper) 5b and the center O intersects the peripheral surface of the printing drum (upper) 2, the discharged plate apparatus 4 The stencil sheet peeling position (upper) from the printing drum (upper) 2 is positioned. When a portion where the line connecting the nip portion between the nip portion of the discharged plate peeling roller (lower) 105a and the discharged plate peeling roller (lower) 105b and the center O ′ intersects with the peripheral surface of the printing drum (lower) 102 is denoted by reference numeral 162, This part 162 is located at a position symmetrical to the part 62 with the transport path 50 as the axis of symmetry, and is located near the part 162 and at a position symmetrical to the peeling position (upper) of the stencil sheet. (Bottom) is located.
[0027]
  Similarly, in the vicinity of a portion 64 where the line connecting the nip portion between the plate feeding roller (upper) 27a and the plate feeding roller (upper) 27b and the center O intersects with the peripheral surface of the printing drum (upper) 2. The base paper supply position (upper) to the printing drum (upper) 2 by the plate making / plate feeding apparatus (upper) 22 is located. A portion where the line connecting the nip portion of the plate feeding roller (lower) 127a and the plate feeding roller (lower) 127b and the center O ′ intersects with the peripheral surface of the printing drum (lower) 102 is denoted by reference numeral 164. This part 164 is located at a position symmetrical to the part 64 with the transport path 50 as the axis of symmetry, and the base paper supply position (lower) is in the vicinity of the part 164 and symmetrical to the base paper supply position (upper). Be locatedThe
[0028]
  The plate making / plate feeding device (lower) 122 includes support means (lower) 123a for supporting a stencil sheet (lower) 123, a thermal head (lower) 124, a platen roller (lower) 125, a cutter (lower) 130, , Feed rollers (lower) 126a, 126b, plate feeding rollers 127a, 127b, a receiving box (lower) 131, and the like. In the vicinity of the peripheral surface of the printing drum (lower) 102, in the unlikely event that printed paper is wound around the printing drum due to the viscosity of the ink, a paper discharge claw 139 that peels off the leading end side of the paper is separated from the printing drum. It is provided so that it can be touched and separated. Here, at a position downstream of the plate feeding rollers 127a and 127b, a movable guide plate 134 constituting a part of a guide device that guides the leading end of the stencil sheet (lower) 123 made to the stencil sheet locking device (lower) 128. Is provided. The position of the movable guide plate 134 is changed by driving means (not shown). In FIG. 1, the state indicated by the solid line is the guide state, and the state indicated by the broken line is the retracted state. In the guide position, the movable guide plate 134 moves to a position very close to the base paper locking device (lower) 128. In the retracted position, the sheet is retracted to a position where it does not interfere with the base paper locking device (lower) 128.The
[0029]
The document image reading unit 10 is positioned above the unit case provided with the printing device (upper) 60a, the printing device (lower) 60b, and the like.
[0030]
The document image reading unit 10 includes a document receiving table 1 for placing a document, a document transport roller 11a and a document separation roller 11b for separating and transporting documents one by one, a contact glass 19 for placing a document to be read, a transport roller 17, A document guide plate 21 arranged around the conveying roller 17 for guiding the document, a movable guide plate 16 for switching the document path, a document discharge table 20 for storing the document fed through the contact glass 19, and a document contact It comprises an endless wide conveying belt 15 that is sent over the glass 19, rollers 18 a and 18 b that support the conveying belt 15, a reading sensor device 13 provided below the contact glass 19, and the like.
[0031]
Among these, the home position of the reading sensor device 13 is directly below the roller 18b as shown in FIG. 1, and the reading position of the document by the reading sensor device 13 when it is located at this home position is denoted by reference numeral 14. Show. When the original is a double-sided original, the reading sensor device 13 moves toward the roller 18a side at a low speed synchronized with the plate making speed in parallel with the surface of the contact glass 19 when reading the second side. That is, this moving speed means the scanning speed of the second side of the double-sided document. Also, the return speed to the home position can be higher than the reading speed. When reading the second of two originals having an image only on one side, the reading sensor is not moved, and the roller and belt side for conveying the original are controlled to move at the same low speed as described above.
[0032]
  The movable guide plate 16 can be switched between a position indicated by a solid line in FIG. 1 and a position indicated by a broken line by a driving means (not shown) such as a solenoid. In the position indicated by the solid line, the document functions to guide the document between the contact glass 19 and the movable guide plate 16, and in the position illustrated by the broken line, the document functions to guide the document to the document discharge table 20. The conveyance roller 17, the document guide plate 21, the movable guide plate 16, and the like have a function of reversing the document and feeding it to the contact glass, and thus constitute an example of the reversing device of the present invention (ContractClaim2, Claims3).
[0033]
In FIG. 4 showing the operation panel of this stencil printing apparatus, the plate making start button S1 is a switch for instructing execution of plate making, the printing start button S2 is a switch for instructing execution of printing, and the stop button S3 is made by stencil printing. A switch for stopping the operation of the apparatus. Reference numeral S4 denotes a numeric keypad for instructing the number of printed sheets, the number of copies, and the like. The front single-sided print button S5 is a switch that issues a print command for only the front surface of the printing paper. The back single-sided print button S6 is a switch for issuing a print command only for the back side of the printing paper. The duplex print button S7 is a switch for instructing printing on both sides of the printing paper. The lamp L1 is lit when the double-sided print button S7 is turned on to indicate that double-sided printing is being performed, and the lamp L2 is lit when the front-side single-sided print switch S5 or the back-sided single-sided print switch S6 is turned on. Thus, it is a lamp that displays that the printer is in the single-sided printing state.
[0034]
  The stencil printing apparatus stores image data read by the reading sensor device 13 and outputs it to the plate making / plate feeding apparatus (upper) 22 or the plate making / plate feeding apparatus (lower) 122 in a timely manner (not shown). have. In the embodiment described below, the output of the storage means is output to the plate making / plate feeding apparatus (upper) 22 (claims).1, Claims2, Claims3).
[0035]
  (2) Duplex printing example with stencil printing machine
  1. When performing double-sided printing that forms an image on both sides of a single sheet of printing paper from two single-sided originals with images on only one side
  This example is claimed2Corresponding to
  A single-sided document refers to a document in which an image is formed only on one side of the document. A description will be given of a case where such single-sided originals having A-line and 4-size sizes are used, and images of these originals are printed on both the front and back sides of a single A-line 4-size printing paper. . In this case, the double-sided print button S7 on the operation panel shown in FIG. 4 is selected, and the required number of prints is designated by the numeric keypad S4.
[0036]
a. Plate removal process
1 and 4, when two originals are set on the original receiving tray 1 and the plate making start button S1 is turned on, the used stencil sheet in the previous printing process remaining on the printing drum (upper) 2 is used. (Upper) The process 3 is performed as follows. When the printing drum (upper) 2 rotates in the direction of the arrow 29, that is, in the clockwise direction, the base paper locking device (upper) 28 reaches the tearing position (upper) in the vicinity of the portion 62 and stops. The stopper (upper) 28 is operated by an opening / closing mechanism (not shown) to release the clamp at the tip of the used stencil sheet (upper) 3.
[0037]
The used stencil sheet (upper) 3 which is freed by releasing the clamp at the front end is made up of the stencil peeling rollers (upper) 5a and 5b and the stencil conveying belts (upper) 6a and 6b. Then, it is peeled off from the front end side by the discharge plate peeling / conveying section composed of the discharge plate roller (upper) 7a, 7b and the like, and begins to be discharged into the discharge plate box (upper) 8. At the same time, the base paper locking device (upper) 28 is temporarily closed by an opening / closing mechanism (not shown). The discharged used stencil sheet (upper) 3 is then moved into the stencil box (upper) 8 by the lowering of the compression plate (upper) 9 when completely removed from the printing drum (upper) 2. Compressed.
[0038]
Similarly, the used stencil sheet (lower) 103 is peeled off from the printing drum (lower) 102. In other words, the printing drum (lower) 102 rotates in the direction indicated by the arrow 129, that is, counterclockwise, and stops when the base paper locking device (lower) 128 reaches the tearing position (upper) near the portion 162. At the same time, the base paper locking device (lower) 128 is actuated by an opening / closing mechanism (not shown) to release the clamp at the tip of the used stencil base paper (lower) 103.
[0039]
The used stencil sheet (lower) 103, which has become free by releasing the clamp at the front end portion, is a stencil peeling roller (lower) 105a, 105b of a stencil discharging device (lower) 104, and a stencil conveying belt (lower) 106a, 106b. Then, it is peeled off from the front end side by a discharge plate peeling / conveying section constituted by a discharge plate roller (lower) 107a, 107b and the like, and discharging into the discharge plate box (lower) 108 is started. At the same time, the base paper locking device (lower) 128 is temporarily closed by an opening / closing mechanism (not shown). The discharged used stencil sheet (lower) 103 is then moved into the stencil box (lower) 108 by the lowering of the compression plate (lower) 109 when it is completely peeled off from the printing drum (lower) 102. Compressed.
Such processing of the used stencil sheet is simultaneously performed in the printing drum (upper) 2 and the printing drum (lower) 102.
[0040]
The printing drum (upper) 2 and the printing drum (lower) 102 are taken in the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 into the stencil discharging device (upper) 4 and the stencil discharging device (lower) 104, respectively. However, the printing drum (upper) 2 rotates in the clockwise direction and the printing drum (lower) 102 rotates in the counterclockwise direction, and the base paper locking device (upper) 28 is moved to the base paper supply position (upper side) near the portion 64. ) And that the base paper locking device (bottom) 128 has reached the base paper supply position (bottom) in the vicinity of the portion 164 is stopped when it is detected by a sensor (not shown). Simultaneously with this rotation stop, each base paper locking device (upper) 28 and base paper locking device (lower) 128 in the closed state are again released, that is, opened by an opening / closing mechanism (not shown). Further, when the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 are continuously pulled by the discharge plate peeling and conveying unit, the stop positions of the printing drum (upper) 2 and the printing drum (lower) 102 are changed. Since the position where the pre-printed unused stencil sheet is locked varies, the discharge plate peeling / conveying section is controlled to stop immediately before the rotation of the printing drum (upper) 2 and the printing drum (lower) 102 stops. The
In this way, the base paper locking device (upper) 28 is located at the base paper supply position (upper) near the portion 64, and the base paper catching device (lower) 128 is located at the base paper supply position (lower) near the portion 164. In this state, the printing drum (upper) 2 and the printing drum (lower) 102 are the plate making / plate feeding unit (upper) 22 and the plate making / plate feeding unit (lower) 122 are pre-made unused stencil sheets. It will wait until it starts to supply the plate. At this time, the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 are still partially wound around the printing drum (upper) 2 and the printing drum (lower) 102, respectively. It has become.
[0041]
b. Document reading process
In parallel with the above plate discharging process, the document reading process also starts simultaneously.
The movable guide plate 16 is previously controlled to the position indicated by the broken line. The reading sensor device 13 is controlled to stand by at the home position and maintain its own position. First, the document conveying roller 11 a of the document image reading unit 10 rotates clockwise, and the document 12 receives the separation force of the document separation roller 116, and the top end 12 a of the first sheet is the reading position of the reading sensor device 13. Sent up to 14. Thereafter, rollers 18a and 18b are used to move the first original on the contact glass 19 at an optimum high speed in which the image data is stored in a storage means (not shown) provided in the stencil printing apparatus main body. The feed belt 15 is controlled to rotate in the counterclockwise direction, and accordingly, the conveyance belt 15 is moved in the counterclockwise direction. The document 12 is read by the reading sensor device 13 while being conveyed.
[0042]
The electrical signal photoelectrically converted in the reading sensor device 13 is input to an A / D (analog / digital) conversion board (not shown) provided in the stencil printing apparatus main body, for example, an image for making a plate on the front side. The data is sequentially stored in the storage means (not shown) as data. When the sensor (not shown) detects that the trailing edge of the first document has passed in front of the reading position 14 of the reading sensor device 13, the document conveying roller 11a rotates again, and the second sheet of the document 12 is rotated. Is fed to the reading position 14 of the reading sensor device 13.
[0043]
Unlike the first document, the second document is moved on the contact glass 19 at a low speed synchronized with the plate making speed. Therefore, the rollers 18a and 18b are controlled to rotate in the counterclockwise direction at a low speed, and the conveyance belt 15 rotates in the counterclockwise direction along with the rotation. That is, the roller and belt for conveying the document are controlled in two stages of high / low speed. As the transport belt 15 rotates, the second document starts to move on the contact glass 19 and simultaneously the transport roller 17 starts to rotate, and the first document is pushed out into the second document. Progressing along the guide plate 21, the paper is gradually discharged onto a document discharge table 20 provided at the top of the document image reading unit 10.
[0044]
As soon as the second document starts moving on the contact glass 19, the image of the second document is sequentially photoelectrically converted in the reading sensor device 13, and the electrical signal is provided in the stencil printing machine main body. The image data is input to an A / D conversion board (not shown), and then subjected to various processes on a plate making board (not shown) to become a digital image signal. At the same time, the plate making process of the base paper for the front side and the back side starts.
[0045]
c. Plate making / plate feeding process
In the plate making / plate feeding apparatus (upper) 22, the platen roller (upper) 25 and the feed rollers (upper) 26a and 26b that press the stencil base (upper) 23 against the thermal head (upper) 24 are rotated. Top) 23 is conveyed. On the stencil sheet (upper) 23 to be conveyed, a plurality of heating elements arranged in a line on the thermal head (upper) 24 are temporarily stored in the storage means (not shown). Heat is selectively generated according to the digital image signal of the first document sent after being subjected to various processes, and the thermoplastic film of the stencil sheet (upper) 23 is melted and perforated.
[0046]
Similarly, the platen roller (lower) 125 and the feed rollers (lower) 126a and 126b that press the stencil sheet (lower) 123 against the thermal head (lower) 124 in the plate making / plate feeding unit (lower) 122 rotate, and the stencil sheet. (Bottom) 123 is conveyed. A plurality of heating elements arranged in a line on the thermal head (lower) 124 with respect to the stencil sheet (lower) 123 conveyed in this way correspond to a digital image signal obtained by converting the second original image. Each of them selectively generates heat, and the thermoplastic film of the stencil sheet (lower) 123 is melt punched.
[0047]
The printing drum (upper) 2 is rotated in the clockwise direction and the printing drum (lower) 102 is rotated in the counterclockwise direction, so that the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 are discharged. (Upper) 4, while taking into the plate discharging device (lower) 104, the base paper locking device (upper) 28 and the base paper locking device (lower) 128 are the base paper supply position (upper) near the part 64 and the base paper near the part 164, respectively. The rotation is stopped when it is detected by a sensor (not shown) that the supply position (downward) has been reached.
[0048]
At the same time as the rotation is stopped, the base paper locking device (upper) 28 and the base paper locking device (lower) 128 are opened by an opening / closing mechanism (not shown), and the rear end of the second original is read. Until it is sent to the reading position 14 of the sensor device 13, that is, until the respective stencil printing is completed for the stencil sheet (upper) 23 for the front side and the stencil sheet (lower) 123 for the back side, reference numeral 32 is given. Receiving box (upper) 31 provided in the plate making / plate feeding section in a relaxed state, as shown in FIG. (Bottom) 131 is temporarily stored.
[0049]
  When the stencil is completed in this way, the stencil sheet (upper) 23 and the stencil sheet (lower) 123 are cut into a predetermined length by the cutter (upper) 30 and the cutter (lower) 130, and then the surface side, The plate-making rollers 27a, 27b, 127a, 127b in the plate-making / plate feeding device (upper) 22 and plate-making / plate feeding device (bottom) 122 for the back side start to rotate by driving means (not shown), and the plate-making unused stencil plate is used. The leading ends of the base paper (upper) 32 and the stencil-made unused stencil base (lower) 132 respectively proceed to the printing drum (upper) 2 and the printing drum (lower) 102 side, and the base paper locking device (upper) 28, The base paper locking device (lower) 128 is reached. At that time, in order to guide the leading end of the stencil-made unused stencil sheet (bottom) 132 made by the plate-making / plate feeding apparatus (bottom) 122 for the back side, The movable guide plate 134 provided in the middle is controlled from a retracted position indicated by a broken line to a guided position indicated by a solid line by energizing a solenoid (not shown). Then, at the predetermined timing, the leading end portions of the pre-made unused stencil sheet (upper) 32 and the pre-made unused stencil sheet (lower) 132 are respectively connected to the base paper locking device (upper) 28 and the base paper locking device (lower) 128. Clamped. Thereafter, the movable guide plate 134 is returned to the retracted position indicated by the broken line by stopping energization of a solenoid (not shown).The
[0050]
The printing drum (upper) 2 rotates in the direction indicated by the arrow 29, and the printing drum (lower) 102 rotates in the direction indicated by the arrow 129. The base paper (lower) 132 starts to be gradually wound around the outer peripheral surfaces of the printing drum (upper) 2 and the printing drum (lower) 102, respectively. Along with this, the stencil separating and conveying section is also activated again, and the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103, which are still partially wound around the printing drum, are gradually peeled off. To go.
[0051]
At a predetermined timing, the uppermost sheet in the printing paper 34 loaded on the paper feed tray 33 is fed by a paper feed roller 35, a separation roller (upper) 36a, and a separation roller (lower) 36b. 37a and sent toward the feed roller (lower) 37b. The printing drum (upper) 2 and the printing drum (lower) 102 are synchronized with the rotation of the printing drum (upper) 2 and the printing drum (lower) 102 by the feed roller (upper) 37a and the feed roller (lower) 37b. Sent between.
[0052]
At the time of non-printing, in order to prevent the pre-made unused stencil sheets (upper) 32 and (lower) 132 wound on the respective drums from contacting and fouling each other, each engages with a stopper portion (not shown), The ink supply devices (upper) 38 and (lower) 138 that are separated from the inner peripheral surface of the porous support plate are printed by the printing paper 34 being conveyed between the printing drums (upper) 2 and (lower) 102. When the upper and lower drums are rotated while energizing the solenoids (upper) and (lower) for printing commands (not shown) at the time when the operation is performed, drum flanges (upper) 47, (lower) ) The cam followers (not shown) attached to the shaft ends of the respective ink supply rollers (upper) 44 and (lower) 144 are driven by the cams (not shown) provided on the inner peripheral surface of the D-cut portion in 147. Rotation center direction is displaced in the ink supply device (top) 38, the stopper is released by the solenoid when the gap is generated in the stopper portion (bottom) 138.
[0053]
Thereafter, the ink supply device (upper) 38 is lowered in the printing drum (upper) 2 as the distance from the cam range increases, and the inner periphery of the porous support plate 83 (see FIG. 5) constituting the printing drum (upper) 2. In contact with the surface, the porous support plate 83 and the mesh screen 89 are pushed down along the drum flange 47 by a predetermined amount toward the printing drum (lower) 102.
Similarly, also in the printing drum (lower) 102, the ink supply device (lower) 138 rises and comes into contact with the inner peripheral surface of the porous support plate 183 (see FIG. 5) that constitutes the printing drum (lower) 102. The support plate 183 and the mesh screen 189 are pushed down in the direction of the printing drum (upper) 2 by a predetermined amount along the drum flange 147.
[0054]
That is, as shown in FIG. 5, the printing drum (upper) 2 and the printing drum (lower) 102 are arranged without changing the inter-axis distance L between the supporting shaft (upper) 82 and the supporting shaft (lower) 182. With the peripheral surface bulging, the printing paper 34 is newly added to the outer peripheral surface of the pre-made unused stencil sheet (upper) 32 newly attached to the outer peripheral surface of the printing drum (upper) 2 and the printing drum (lower) 102. Are simultaneously pressed against the pre-made unused stencil sheet (lower) 132 and the printing ink is printed from the perforated portions of the pre-made unused stencil sheet (upper) 32 and the pre-made unused stencil sheet (lower) 132. Double-sided printing is performed by transferring to the front surface and back surface.
[0055]
Further, during the printing, the solenoid for the print command is continuously energized, so that the cam followers (not shown) attached to the shaft ends of the upper and lower ink supply rollers are drum flanges (upper) 47, (lower The ink supply device (upper) 38, (lower) 138 is separated from the inner peripheral surface of the porous support plate at the cam portion, and the porous support plate at the portion without the cam. Repeat the operation of pushing the inner peripheral surface of.
At the end of printing, when a cam follower attached to the shaft end of each of the upper and lower ink supply rollers rides on the cam and a gap is generated in the stopper part of the ink supply device, a print command is detected. The energization of the solenoid is stopped, the stopper is actuated by the biasing of a spring (not shown), and the ink supply device is kept in contact with the inner peripheral surface of the porous support plate.
Note that double-sided printing can also be performed by adopting a mechanism that moves the entire upper or lower printing drum up and down without adopting the configuration shown in FIG.
[0056]
When the printing paper 34 printed in this way passes through the printing unit 51 (see FIG. 2), the outer peripheral surface of the printing drum (upper) 2 by the paper discharge peeling claw (upper) 39 and the paper discharge peeling claw (lower) 139. Is removed from the pre-made unused stencil sheet (upper) 32 and the pre-made unused stencil sheet (lower) 132 mounted on the outer peripheral surface of the printing drum (lower) 102 and sucked by the conveying suction fan 42. The so-called trial printing is completed by being transported by the transport belt 41 and dropped onto the paper discharge tray 40. During the trial printing, the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 are used. Respectively enter the inside of the discharge box (upper) 8 and the discharge box (lower) 108 respectively. Next, a new stencil sheet is completely wound around each printing drum, and in the same process as the trial printing, the paper feeding, printing, and paper discharging processes are repeated for the set number of printed sheets, and the stencil printing process. Will end.
[0057]
(D) Explanation by time chart
In the stencil printing apparatus having storage means for storing image reading data as in the above example, the plate making / plate feeding process by the plate making / plate feeding apparatus (upper) 22 and the plate making / plate feeding apparatus (lower) 122 is performed. Parallel processing is possible, so that the so-called first print time is significantly reduced as compared with the case where no storage means is provided. This will be described with reference to the time chart of FIG.
[0058]
In FIG. 6, the upper stage is a case having a storage means, which corresponds to the case of this example. The lower row shows a case where no storage means is provided. In any of these, as schematically shown in the right column, the plate-making / plate feeding apparatus (upper) 22 and the plate-making / plate feeding apparatus (lower) 122 have the conveyance path 50 of printing paper as the axis of symmetry, They are provided at symmetrical positions.
[0059]
In the upper example, as already described, in the “original reading” column, the first single-sided original is read at high speed by the original reading sensor device 13, and the image data is temporarily stored in the storage means. Next, the first single-sided original is discharged, and at the same time, the image of the second single-sided original is read by the original reading sensor device 13 at the plate making speed (low speed), and at the same time, the “plate making / plate feeding device” As shown in the (lower) column, plate making is performed by the plate making / plate feeding apparatus (lower) 122. The relationship between this reading and plate making is shown by the dashed line arrow in the upper part of FIG. On the other hand, as soon as reading of the second single-sided document is started, plate making by the plate making / plate feeding device (upper) 22 has already been executed as shown in the column “plate making / plate feeding device (upper)” by the output of the storage means. This is done in parallel with the plate making in the “plate making / plate feeding device (lower)”. this
The relationship between the time lag between the start of image reading of the first document and the start of plate-making on the front side with respect to that image is indicated by the dashed arrows in the upper part of FIG. As a result, in the actual machine, the first print time could be set to 11 sec for performing A4 size double-sided printing from two A4 size single-sided originals.
[0060]
On the other hand, in the example in the lower part of FIG. 6 in the case where the storage unit is not provided, the reading and plate making for the first single-sided document and the reading and plate-making for the second single-sided document are respectively performed in real time. Must be done. Moreover, since there is only one reading sensor device 13, plate making cannot be performed in parallel as in the example in the upper part of FIG. 6, and serial processing is performed. The relationship between reading and plate-making for the first single-sided document is indicated by a dashed arrow in the lower part of FIG. 6, and the relationship between reading and plate-making for the second single-sided document is indicated by a one-dot chain line. Here, since the processing of the first single-sided original is a low-speed process synchronized with the plate making, the actual machine has a first print time for performing A4 size double-sided printing from two A4 size single-sided originals. 14 sec.
As described above, in the stencil printing apparatus of the simultaneous double-sided printing method having only one reading sensor device, the first print time when the storage means for storing the image reading data is provided as described above is the shortest.
[0061]
  Example 2.1 When double-sided printing is used to form an image on both sides of a print sheet using a double-sided original
  This example is claimed2Corresponding to
  A case will be described in which there is one double-sided document of A-line 4-size size, and an image of this document is printed on both the front and back sides of a single A-line 4-size printing sheet. In this case, the double-sided print button S7 on the operation panel shown in FIG. 4 is selected, and the required number of prints is designated by the numeric keypad S4.
[0062]
a. Plate removal process
1 and 4, when a double-sided original is set on the original receiving tray 1 and the plate making start button S1 is turned on, the used stencil remaining on the printing drum (upper) 2 in the previous printing process is used. The processing of the base paper (upper) 3 is performed as follows. When the printing drum (upper) 2 rotates in the direction of the arrow 29, that is, in the clockwise direction, the base paper locking device (upper) 28 reaches the tearing position (upper) in the vicinity of the portion 62 and stops. The locking device (upper) 28 is operated by an opening / closing mechanism (not shown) to release the clamp at the tip of the used stencil sheet (upper) 3.
[0063]
The used stencil sheet (upper) 3 which is freed by releasing the clamp at the front end is made up of the stencil peeling rollers (upper) 5a and 5b and the stencil conveying belts (upper) 6a and 6b. Then, it is peeled off from the front end side by the discharge plate peeling / conveying section composed of the discharge plate roller (upper) 7a, 7b and the like, and begins to be discharged into the discharge plate box (upper) 8.
[0064]
At the same time, the base paper locking device (upper) 28 is temporarily closed by an opening / closing mechanism (not shown). The discharged used stencil sheet (upper) 3 is then moved into the stencil box (upper) 8 by the lowering of the compression plate (upper) 9 when completely removed from the printing drum (upper) 2. Compressed.
[0065]
Similarly, the used stencil sheet (lower) 103 is peeled off from the printing drum (lower) 102. In other words, the printing drum (lower) 102 rotates in the direction indicated by the arrow 129, that is, counterclockwise, and stops when the base paper locking device (lower) 128 reaches the tearing position (upper) near the portion 162. At the same time, the base paper locking device (lower) 128 is actuated by an opening / closing mechanism (not shown) to release the clamp at the tip of the used stencil base paper (lower) 103.
[0066]
The used stencil sheet (lower) 103, which has become free by releasing the clamp at the front end portion, is a stencil peeling roller (lower) 105a, 105b of a stencil discharging device (lower) 104, and a stencil conveying belt (lower) 106a, 106b. Then, it is peeled off from the front end side by a discharge plate peeling / conveying section constituted by a discharge plate roller (lower) 107a, 107b and the like, and discharging into the discharge plate box (lower) 108 is started. At the same time, the base paper locking device (lower) 128 is temporarily closed by an opening / closing mechanism (not shown). The discharged used stencil sheet (lower) 103 is then moved into the stencil box (lower) 108 by the lowering of the compression plate (lower) 109 when it is completely peeled off from the printing drum (lower) 102. Compressed.
Such processing of the used stencil sheet is simultaneously performed in the printing drum (upper) 2 and the printing drum (lower) 102.
[0067]
The printing drum (upper) 2 and the printing drum (lower) 102 are taken in the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 into the stencil discharging device (upper) 4 and the stencil discharging device (lower) 104, respectively. However, the printing drum (upper) 2 rotates in the clockwise direction and the printing drum (lower) 102 rotates in the counterclockwise direction, and the base paper locking device (upper) 28 is moved to the base paper supply position (upper side) near the portion 64. ) And that the base paper locking device (bottom) 128 has reached the base paper supply position (bottom) in the vicinity of the portion 164 is stopped when it is detected by a sensor (not shown). Simultaneously with this rotation stop, each base paper locking device (upper) 28 and base paper locking device (lower) 128 in the closed state are again released, that is, opened by an opening / closing mechanism (not shown). Further, when the used stencil sheet (upper) 3 and the used stencil sheet 103 are continuously pulled by the discharge plate peeling / conveying section, the stop positions of the printing drum (upper) 2, the printing drum (lower) 102, etc. are changed, and the stencil has been made. Since the position where the unused stencil sheet is locked varies, the discharge plate peeling / conveying section is controlled to stop immediately before the rotation of the printing drum (upper) 2 and the printing drum (lower) 102 is stopped.
In this way, the base paper locking device (upper) 28 is located at the base paper supply position (upper) near the portion 64, and the base paper catching device (lower) 128 is located at the base paper supply position (lower) near the portion 164. In this state, the printing drum (upper) 2 and the printing drum (lower) 102 are the plate making / plate feeding unit (upper) 22 and the plate making / plate feeding unit (lower) 122 are pre-made unused stencil sheets. It will wait until it starts to supply the plate. At this time, the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 are still partially wound around the printing drum (upper) 2 and the printing drum (lower) 102, respectively. It has become.
[0068]
b. Document reading process
In parallel with the above plate discharging process, the document reading process also starts simultaneously.
The movable guide plate 16 is previously controlled to the position indicated by the solid line. The reading sensor device 13 is controlled to stand by at the home position and maintain its own position. First, the document conveying roller 11 a of the document image reading unit 10 rotates clockwise, and the leading end 12 a of the document 12 is sent to the reading position 14 of the reading sensor device 13. Thereafter, the original 12 on which images are formed on both sides is moved on the contact glass 19 at an optimum high speed at which image data on one side is stored in a storage means (not shown) provided in the stencil printing apparatus main body. In addition, the rollers 18a and 18b rotate in the counterclockwise direction, and accordingly, the conveyance belt 15 is controlled to move in the counterclockwise direction, and the document 12 is read by the reading sensor device 13 while being conveyed. To go.
[0069]
The electrical signal photoelectrically converted in the reading sensor device 13 is input to an A / D (analog / digital) conversion board (not shown) provided in the stencil printing apparatus main body, for example, an image for making a plate on the front side. The data is sequentially stored in the storage means (not shown) as data. When the rear end of the document 12 passes over a document presence / absence detection sensor (not shown) provided on the document receiving tray 1, it is detected that there is no document. That is, when the duplex printing button S7 is selected and there is only one document, the control device on the stencil printing apparatus main body side determines that the document is a duplex document.
[0070]
Thereafter, it is detected by a sensor (not shown) that the trailing edge of the document 12 has passed in front of the reading position 14 of the reading sensor device 13, and the plate-making process on the front side starts. That is, in the plate making / plate feeding apparatus (upper) 22, a stencil sheet (upper) 23 is pressed against a thermal head (upper) 24, a platen roller (upper) 25, a feed roller (upper) 26a, and a feed roller (upper) 26b. Rotates and the stencil sheet (upper) 23 is conveyed. With respect to the stencil sheet (upper) 23 thus conveyed, a plurality of heating elements arranged in a line on the thermal head (upper) 24 are temporarily stored in the storage means (not shown), and thereafter not shown. The thermoplastic film of the stencil sheet (upper) 23 is melted and perforated selectively according to the digital image signal on the surface side sent after being subjected to various processes on the plate-making substrate.
[0071]
Simultaneously with the start of the front side plate-making process, the conveying roller 17 starts to rotate, and the document 12 advances along the document guide plate 21. The movable guide plate 16 is in the position indicated by the solid line as described above, and the document 12 can be reversed so that the leading end of the document 12 is again conveyed onto the contact glass 19. When it is detected by a sensor (not shown) that the leading end of the document 12 has reached the lower portion of the roller 18a, the rollers 18a and 18b are rotated clockwise in order to transport the document 12 leftward in FIG. And the conveyor belt 15 is controlled to rotate in the clockwise direction.
[0072]
When the document 12 is conveyed by the conveying belt 15 and the sensor (not shown) detects that the leading end of the document 12 has reached the reading position 14 of the reading sensor device 13, the rotation of the rollers 18a and 18b is stopped. Accordingly, the rotation of the conveyor belt 15 is also stopped. In this way, the reversing operation of the document 12 is completed. As a result, the other surface, that is, the back surface of the document 12 faces the reading sensor 13 through the contact glass 19.
[0073]
Next, the reading sensor 13 that has been controlled so as to stand by at the home position (the reading position 14 shown in FIG. 1) and maintain its own position at a low speed synchronized with the plate-making speed on the back side is shown in FIG. As soon as the reading operation starts, the read images are sequentially photoelectrically converted in the reading sensor device 13, and the electric signal is A / D conversion (not shown) provided in the stencil printing apparatus main body. After being input to the substrate, various processes are performed on a plate-making substrate (not shown) to become a digital image signal. When the reading is finished, the reading sensor device 13 returns to the home position again.
[0074]
Next, the movable guide plate 16 is switched to the position of the broken line in FIG. 1 in order to discharge the document 12 onto the document discharge table 20 provided on the upper part of the document image reading unit 10. Further, the rollers 18a and 18b are rotated again in the counterclockwise direction, and accordingly, the conveyance belt 15 is controlled to move in the counterclockwise direction. With the rotation of the conveying belt 15, the document 12 advances along the document guide plate 21, and the document 12 is sent onto the document discharge table 20.
[0075]
c. Plate making / plate feeding process
Simultaneously with the start of the reading operation on the back side of the document, the plate making process on the back side starts. That is, the platen roller (lower) 125 and the feed rollers (lower) 126a and 126b that press the stencil sheet (lower) 123 against the thermal head (lower) 124 in the plate making / plate feeding apparatus (lower) 122 rotate, and the stencil sheet (Bottom) 123 is conveyed. With respect to the stencil sheet (lower) 123 being conveyed, a plurality of heating elements arranged in a line on the thermal head (lower) 124 are selectively selected according to a digital image signal obtained by converting the document image on the other side. Heat is generated, and the thermoplastic film of the stencil sheet (lower) 123 is melt punched.
[0076]
The printing drum (upper) 2 is rotated in the clockwise direction and the printing drum (lower) 102 is rotated in the counterclockwise direction, so that the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 are discharged. (Upper) 4, while taking into the plate discharging device (lower) 104, the base paper locking device (upper) 28 and the base paper locking device (lower) 128 are the base paper supply position (upper) near the part 64 and the base paper near the part 164, respectively. The rotation is stopped when it is detected by a sensor (not shown) that the supply position (downward) has been reached.
[0077]
Simultaneously with these rotation stops, the base paper locking device (upper) 28 and the base paper locking device (lower) 128 are opened by an opening / closing mechanism (not shown), and the reading position 14 of the reading sensor device 13 is the original. 12 until reaching the rear end of the rear surface side, that is, until the completion of the plate-making on the rear surface side, the pre-made unused stencil sheet indicated by reference numeral 32 (upper) and the pre-made unused stencil sheet indicated by reference numeral 132. As shown in (lower), it is temporarily stored in a receiving box (upper) 31 and a receiving box (lower) 131 provided in the plate making / plate feeding section in a relaxed state.
[0078]
When the stencil is completed in this way, the stencil sheet (upper) 23 and the stencil sheet (lower) 123 are cut into a predetermined length by the cutter (upper) 30 and the cutter (lower) 130, and then the surface side, The plate-making rollers 27a, 27b, 127a, 127b in the plate-making / plate feeding device (upper) 22 and plate-making / plate feeding device (bottom) 122 for the back side start to rotate by driving means (not shown), and the plate-making unused stencil plate is used. The leading ends of the base paper (upper) 32 and the stencil-made unused stencil base (lower) 132 respectively proceed to the printing drum (upper) 2 and the printing drum (lower) 102 side, and the base paper locking device (upper) 28, The base paper locking device (lower) 128 is reached. At that time, in order to guide the leading end of the stencil-made unused stencil sheet (bottom) 132 made by the plate-making / plate feeding apparatus (bottom) 122 for the back side, The movable guide plate 134 provided in the middle is controlled from a retracted position indicated by a broken line to a guided position indicated by a solid line by energizing a solenoid (not shown).
[0079]
  Then, at the predetermined timing, the leading end portions of the pre-made unused stencil sheet (upper) 32 and the pre-made unused stencil sheet (lower) 132 are respectively connected to the base paper locking device (upper) 28 and the base paper locking device (lower) 128. Clamped. Thereafter, the movable guide plate 134 is returned to the retracted position indicated by the broken line by stopping energization of a solenoid (not shown).The
[0080]
The printing drum (upper) 2 rotates in the direction indicated by the arrow 29, and the printing drum (lower) 102 rotates in the direction indicated by the arrow 129. The base paper (lower) 132 starts to be gradually wound around the outer peripheral surfaces of the printing drum (upper) 2 and the printing drum (lower) 102, respectively. Along with this, the stencil separating and conveying section is also activated again, and the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103, which are still partially wound around the printing drum, are gradually peeled off. To go.
[0081]
At a predetermined timing, the uppermost sheet in the printing paper 34 loaded on the paper feed tray 33 is fed by a paper feed roller 35, a separation roller (upper) 36a, and a separation roller (lower) 36b. 37a and sent toward the feed roller (lower) 37b. The printing drum (upper) 2 and the printing drum (lower) 102 are synchronized with the rotation of the printing drum (upper) 2 and the printing drum (lower) 102 by the feed roller (upper) 37a and the feed roller (lower) 37b. Sent between.
[0082]
At the time of non-printing, in order to prevent the pre-made unused stencil sheets (upper) 32 and (lower) 132 wound on the respective drums from contacting and fouling each other, each engages with a stopper portion (not shown), The ink supply devices (upper) 38 and (lower) 138 that are separated from the inner peripheral surface of the porous support plate are printed by the printing paper 34 being conveyed between the printing drums (upper) 2 and (lower) 102. When the upper and lower drums are rotated while energizing the solenoids (upper) and (lower) for printing commands (not shown) at the time when the operation is performed, drum flanges (upper) 47, (lower) ) The cam followers (not shown) attached to the shaft ends of the respective ink supply rollers (upper) 44 and (lower) 144 are driven by the cams (not shown) provided on the inner peripheral surface of the D-cut portion in 147. Rotation center direction is displaced in the ink supply device (top) 38, the stopper is released by the solenoid when the gap is generated in the stopper portion (bottom) 138.
[0083]
Thereafter, the ink supply device (upper) 38 is lowered in the printing drum (upper) 2 as the distance from the cam range increases, and the inner periphery of the porous support plate 83 (see FIG. 5) constituting the printing drum (upper) 2. In contact with the surface, the porous support plate 83 and the mesh screen 89 are pushed down along the drum flange 47 by a predetermined amount toward the printing drum (lower) 102.
Similarly, also in the printing drum (lower) 102, the ink supply device (lower) 138 rises and comes into contact with the inner peripheral surface of the porous support plate 183 (see FIG. 5) that constitutes the printing drum (lower) 102. The support plate 183 and the mesh screen 189 are pushed down in the direction of the printing drum (upper) 2 by a predetermined amount along the drum flange 147.
[0084]
That is, as shown in FIG. 5, the printing drum (upper) 2 and the printing drum (lower) 102 are arranged without changing the inter-axis distance L between the supporting shaft (upper) 82 and the supporting shaft (lower) 182. With the peripheral surface bulging, the printing paper 34 is newly added to the outer peripheral surface of the pre-made unused stencil sheet (upper) 32 newly attached to the outer peripheral surface of the printing drum (upper) 2 and the printing drum (lower) 102. Are simultaneously pressed against the pre-made unused stencil sheet (lower) 132 and the printing ink is printed from the perforated portions of the pre-made unused stencil sheet (upper) 32 and the pre-made unused stencil sheet (lower) 132. Double-sided printing is performed by transferring to the front surface and back surface.
[0085]
Further, during the printing, the solenoid for the print command is continuously energized, so that the cam followers (not shown) attached to the shaft ends of the upper and lower ink supply rollers are drum flanges (upper) 47, (lower The ink supply device (upper) 38, (lower) 138 is separated from the inner peripheral surface of the porous support plate at the cam portion, and the porous support plate at the portion without the cam. Repeat the operation of pushing the inner peripheral surface of.
At the end of printing, when a cam follower attached to the shaft end of each of the upper and lower ink supply rollers rides on the cam and a gap is generated in the stopper part of the ink supply device, a print command is detected. The energization of the solenoid is stopped, the stopper is actuated by the biasing of a spring (not shown), and the ink supply device is kept in contact with the inner peripheral surface of the porous support plate.
[0086]
Note that double-sided printing can also be performed by adopting a mechanism that moves the entire upper or lower printing drum up and down without adopting the configuration shown in FIG.
[0087]
When the printing paper 34 printed in this way passes through the printing unit 51 (see FIG. 2), the outer peripheral surface of the printing drum (upper) 2 by the paper discharge peeling claw (upper) 39 and the paper discharge peeling claw (lower) 139. Is removed from the pre-made unused stencil sheet (upper) 32 and the pre-made unused stencil sheet (lower) 132 mounted on the outer peripheral surface of the printing drum (lower) 102 and sucked by the conveying suction fan 42. The so-called trial printing is completed by being transported by the transport belt 41 and dropped onto the paper discharge tray 40. During the trial printing, the used stencil sheet (upper) 3 and the used stencil sheet (lower) 103 are used. Respectively enter the inside of the discharge box (upper) 8 and the discharge box (lower) 108 respectively. Next, a new stencil sheet is completely wound around each printing drum, and in the same process as the trial printing, the paper feeding, printing, and paper discharging processes are repeated for the set number of printed sheets, and the stencil printing process. Will end.
[0088]
(D) Explanation by time chart
In the stencil printing apparatus having storage means for storing image reading data as in the above example, the plate making / plate feeding process by the plate making / plate feeding apparatus (upper) 22 and the plate making / plate feeding apparatus (lower) 122 is performed. Parallel processing is possible, and the total print preparation process time, the so-called first print time, can be significantly shortened compared to the case where no storage means is provided. This will be described with reference to the time chart of FIG.
[0089]
In FIG. 7, the upper stage is a case having a storage means, which corresponds to the case of this example. The lower row shows a case where no storage means is provided. In any of these, as schematically shown in the right column, the plate-making / plate feeding apparatus (upper) 22 and the plate-making / plate feeding apparatus (lower) 122 have the conveyance path 50 of printing paper as the axis of symmetry, They are provided at symmetrical positions.
[0090]
In the upper example, as already described, the surface of the first double-sided original is read at a high speed by the original reading sensor device 13 in the “original reading” column, and the image data is temporarily stored in the storage means. The Next, the double-sided original is reversed and read by the original reading sensor device 13 at the plate making speed (low speed), and at the same time, as shown in the “plate making / plate feeding apparatus (lower)” column, in real time, the plate making / plate feeding apparatus. (Bottom) 122 makes the plate. The relationship between this reading and plate making is indicated by the dashed line arrow in the upper part of FIG. On the other hand, as soon as the document reversal starts, the plate making by the plate making / plate feeding apparatus (upper) 22 is already executed as shown in the column of “plate making / plate feeding apparatus (upper)” by the output of the storage means. This is performed in parallel with the plate making in the “plate making / plate feeding apparatus (lower)”. The relationship between the start of image reading on the front surface and the time lag between the start of plate-making on the front side with respect to that image is indicated by the dashed arrows in the upper part of FIG. As a result, in the actual machine, the first print time could be set to 13 sec to perform A4 size double-sided printing from one A4 size double-sided original.
[0091]
On the other hand, in the example in the lower part of FIG. 7 in the case where the storage means is not provided, the reading and plate making for the front surface of the double-sided document and the reading and plate making for the back surface must be performed in real time. In addition, since there is only one reading sensor device 13, plate making cannot be performed in parallel as in the example in the upper part of FIG. 7, resulting in serial processing. The relationship between reading and plate-making on the front side of a double-sided document is indicated by a dashed arrow in the lower part of FIG. 7, and the relationship between reading and plate-making on the back side of a double-sided document is indicated by a dashed line. Further, since the front surface processing is a low speed processing synchronized with the plate making, the first machine takes 16 seconds to perform A4 size double-sided printing from an A4 size double-sided original in the actual machine. In the example in the upper part of FIG. 7 (example of one double-sided original), compared with the example in the upper part of FIG. 6 (example of two single-sided originals), the first print time is increased by 2 sec. It is for time to do. Therefore, in the simultaneous duplex printer as in the embodiment of the present invention, the first print time can be minimized when two single-sided originals are provided and storage means for storing image read data is provided.
[0092]
A comparative example will be described with reference to FIG. In this comparative example, as shown in the right column of FIG. 8, the printing drum (upper) and the printing drum (lower) are opposed to each other in the vertical direction, and the plate making has a point-symmetric relationship with the printing unit 51 as a symmetric point.・ The plate feeder (upper) and the plate making / plate feeder (lower) are located. In the case of such a configuration, the movable guide plate 134 and the like for guiding the stenciled unused stencil sheet (lower) 132 to the stencil sheet locking device 128 are not required as in the examples of FIGS. However, since there is a difference in the rotational movement distance from the printing unit 51 to the plate making / plate feeding devices (upper) and (lower), the time for front surface printing and back surface printing is present in series, and the storage means Regardless of whether or not there is, the first print time when performing A4 double-sided printing from one A4 double-sided original is 16 sec.
[0093]
Note that the first print time described in FIGS. 6 to 8 is an evaluation result in the present situation, and a mechanism such as document image reading, plate making, document reversal, etc., with the combination of the various operations and the storage means as it is. It goes without saying that these times can be further shortened by improving the performance of the storage means.
[0094]
As described above with reference to FIGS. 6 to 8, as described in Examples 1 and 2, by optimizing the combination of operations such as document image reading, plate making, document reversal, etc. and storage means, the shortest print preparation process can be achieved. The time required, so-called first print time, can be realized.
[0095]
【The invention's effect】
  In invention of Claim 1,The first print time can be shortened for both duplex printing based on a single-sided original and double-sided printing based on a double-sided original compared to a case where no storage means is provided.
  In invention of Claim 2,For double-sided printing based on a double-sided original, there is no useless movement in the way of sending the original and the original reading sensor, and the first print time can be shortened as compared with the case where no storage means is provided.
  According to the third aspect of the present invention, in double-sided printing based on a single-sided original, there is no useless movement in how to send the original, and the first print time can be shortened as compared with the case where no storage means is provided.
[Brief description of the drawings]
FIG. 1 is a front view illustrating the overall configuration of a stencil printing apparatus.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a perspective view illustrating a configuration of a printing drum.
FIG. 4 is a front view of an operation panel of the stencil printing apparatus.
FIG. 5 is a diagram illustrating a state in which a peripheral surface portion of a printing drum bulges during printing.
FIG. 6 is a timing chart for explaining a first print time.
FIG. 7 is a timing chart for explaining a first print time.
FIG. 8 is a timing chart for explaining a first print time.
[Explanation of symbols]
2 Printing drum (top)
12 Manuscript
16 Movable guide plate (as reversing device)
28, 128 Base paper locking device
34 Printing paper
50 Transport route
62, 64, 162, 164 sites
102 Printing drum (bottom)
134 Movable guide plate (as guide device)

Claims (3)

A printing drum which is rotatably held has an outer peripheral surface of the stencil sheet retaining device for mounting a stencil sheet, an ink supply device for supplying ink to an inner circumferential surface of the arranged inside the printing drum the printing drum And a stencil discharging device for stripping and storing the used stencil sheet from the printing drum, and a stencil making and feeding device for supplying the stencil sheet newly made to the stencil sheet locking device,
The ink supplied from the ink supply device is moved by bringing the printing paper into contact with the outer peripheral surface through the stencil paper while rotating the printing drum with the stencil paper mounted on the outer peripheral surface. printing apparatus for performing printing from perforations of the stencil sheet is transferred to the printing paper, it is provided respectively on the front and rear sides of the printing paper across the transport path of the printing paper at the time of the printing ,
A position where the stencil sheet is peeled from the printing drum by the plate removing device;
The base paper supply position to the printing drum by the plate making / plate feeding device,
The plate making / plate feeding device has a reading sensor device for reading one side of a document, and the other side is also used by using a document reversing device when reading a double-sided document. Plate making is performed according to image data of an original from an original reading unit having a reading function, and one side of either one side of image data of a double-sided original or two single-sided originals read by the original reading unit A stencil printing apparatus having storage means for storing image data obtained by reading image data of a document and outputting the image data to the plate making / plate feeding apparatus in a timely manner,
Image data of one image of one side of a double-sided original or two single-sided originals by the original reading unit is stored in the storage means, and the other one side of the double-sided original or the remaining one of the remaining sheets is stored. While making an image of a single-sided original, plate making is performed by one plate making apparatus using the image data of the original, and another plate making apparatus is driven by the image data stored in the storage means over this plate making operation time. A stencil printing apparatus characterized in that the processes of the plate making / plate feeding apparatus are performed in parallel with respect to each of the printing apparatuses arranged opposite to each other with the conveyance path of the printing paper at the time of printing . A printing drum having a stencil sheet holding device for mounting a stencil sheet on the outer peripheral surface and rotatably held, and an ink supply device that is provided inside the printing drum and supplies ink to the inner peripheral surface of the printing drum And a stencil discharging device for stripping and storing the used stencil sheet from the printing drum, and a stencil making and feeding device for supplying the stencil sheet newly made to the stencil sheet locking device,
The ink supplied from the ink supply device is moved by bringing the printing paper into contact with the outer peripheral surface through the stencil paper while rotating the printing drum with the stencil paper mounted on the outer peripheral surface. Printing devices that perform printing by transferring to the printing paper from the perforation part of the stencil paper are provided on the front side and the back side of the printing paper across the transport path of the printing paper at the time of printing, respectively. ,
The stencil sheet peeling position from the printing drum by the plate discharging device and the base paper supply position to the printing drum by the plate making / plate feeding device are provided at symmetrical positions with the transport path as a symmetry axis, respectively. The plate making / plate feeding device has a reading sensor device for reading one side of a document, and performs plate making according to image data of a document from a document reading unit having a function of reading the other side using a document reversing device when reading a double-sided document. And storing image data obtained by reading the image data of one side of a double-sided original or one of the two-sided originals read by the original reading unit, in a timely manner. A stencil printing apparatus having storage means for outputting to the plate making / plate feeding apparatus,
When performing double-sided printing to form images on both sides of the printing paper as with a single-sided original,
The reading sensor device is fixed at a home position, the double-sided document is conveyed, the image data read by the storage means is stored while the reading sensor device reads an image on one side of the document by scanning, When the end portion passes through the reading sensor device, the plate making operation is immediately started by one plate making / plate feeding device based on the single-sided image data stored in the storage means, and at the same time, the original is reversed by the reversing device. After this, the original is fixed and the reading sensor device is scanned at a speed synchronized with the plate making speed, thereby performing the plate making operation with another plate making / plate feeding device while reading the image on the other side. stencil printing apparatus characterized by parallel processing plate-making by. A printing drum having a stencil sheet holding device for mounting a stencil sheet on the outer peripheral surface and rotatably held, and an ink supply device that is provided inside the printing drum and supplies ink to the inner peripheral surface of the printing drum And a stencil discharging device for stripping and storing the used stencil sheet from the printing drum, and a stencil making and feeding device for supplying the stencil sheet newly made to the stencil sheet locking device,
The ink supplied from the ink supply device is moved by bringing the printing paper into contact with the outer peripheral surface through the stencil paper while rotating the printing drum with the stencil paper mounted on the outer peripheral surface. Printing devices that perform printing by transferring to the printing paper from the perforation part of the stencil paper are provided on the front side and the back side of the printing paper across the transport path of the printing paper at the time of printing, respectively. ,
The stencil sheet peeling position from the printing drum by the plate discharging device and the base paper supply position to the printing drum by the plate making / plate feeding device are provided at symmetrical positions with the transport path as a symmetry axis, respectively. ,
The plate making / plate feeding device has a reading sensor device for reading one side of a document, and performs plate making according to image data of a document from a document reading unit having a function of reading the other side using a document reversing device when reading a double-sided document. The image data obtained by reading the image data of one side of a double-sided document or the image data of one of the two-sided documents read by the document reading unit is stored in a timely manner. A stencil printing apparatus having storage means for outputting to a plate making / plate feeding apparatus,
When performing double-sided printing in which images are formed on both sides of one sheet of printing paper from two single-sided originals having images only on one side,
Image data read by the storage means while the reading sensor device is fixed at the home position, one of the two originals is conveyed, and the reading sensor device reads the image of the first original by scanning. Plate making operation based on the image data stored in the storage means when the trailing edge of the first document passes through the reading sensor device and the second document reaches the reading sensor device. Is started by one plate-making / plate-feeding device, and at the same time, the second document is moved at a speed synchronized with the plate-making speed in front of the reading sensor device while the reading sensor device is fixed at the home position. The plate-making operation for the second original by the other plate-making / plate-feeding device while the image sensor is read by the reading sensor is combined with the plate-making operation for the first original. Stencil printing machine, characterized in that the parallel processing Te.

Images