JP2004262039A - Stencil printing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid deviation of an imaging position of original paper of stencil printing caused by rickety phenomenon of a locking mechanism of a printing plate making unit in an apparatus in which the printing plate making unit can be freely drawn out. <P>SOLUTION: The stencil printing apparatus is provided with a platen roll 14, a writing head 15 and a head positioning means 36 for positioning the writing head 15 on the platen roll 14, and has the printing plate making unit 3 which writes a perforation image on the original paper of the stencil printing which makes a carrying passage between the writing head 15 and the platen roll 14, and is provided with the printing plate making unit 3 so as to be freely drawable in an apparatus housing 4. In addition, a platen shaft 31 of the platen roll 14 is freely movable in its shaft direction T in a unit housing 20 of the printing plate making unit 3, and is energized by a compression coil spring 32 in the storing set positional direction t1 of the printing plate making unit 3, and at a storing set position of the printing plate making unit 3, the apex of the platen shaft 31 is brought into contact with a back surface side plate 4b of the apparatus housing 4 under a condition where a spring force of the compression coil spring 32 is received. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stencil printing apparatus having a stencil unit for writing a perforated image on a stencil sheet conveyed by rotation of a platen roll with a writing head, using a stencil sheet as a conveyance path between a platen roll and a writing head.
[0002]
[Prior art]
A perforated image based on image data is formed on a long stencil sheet by a writing head, the stencil sheet having the perforated image formed thereon is cut into a predetermined size, and the stencil sheet cut into the predetermined size is wound around the outer periphery of the drum. Various stencil printing apparatuses have been proposed in which a printing sheet is pressed and conveyed to a rotating drum which is mounted and rotated, and a perforated image of a stencil sheet is transferred to the printing sheet in the pressing and conveying process to obtain a printed material.
[0003]
FIGS. 7 and 8 show a conventional example of a stencil making section for forming a perforated image on a stencil sheet (for example, see Patent Document 1).
[0004]
As shown in FIGS. 7 and 8, the stencil making unit 100 has a stencil housing unit 102 for housing a stencil paper 101 wound in a long roll shape, and the stencil housing unit 102 and a drum of a printing unit are provided. A transport path R for the stencil sheet 101 is formed up to a position near 103.
[0005]
The transport path R includes a tension roll 104 disposed immediately downstream of the base paper storage unit 102, a lower guide member 105 disposed downstream of the tension roll 104 and below the transport path R, and A platen roll 106 and a write head 107 disposed downstream of the guide member 105; a pair of upper and lower first guide members 108a and 108b disposed downstream of the platen roll 106 and the write head 107; A pair of upper and lower load rolls 109a and 109b disposed in the guide section of the guide members 108a and 108b, and a pair of upper and lower rollers disposed downstream of the pair of first guide members 108a and 108b and downstream of the base paper cutter 110. And the second guide members 111a and 111b.
[0006]
The platen roll 106 and the lower load roll 109b are provided below the transport path R of the stencil sheet 101, and are supported by the apparatus housing 120. The write head 107 and the upper load roll 109a are fixed to a pressure plate 113 rotatably supported on a device housing 120 via a rotation support pin 112. The pressure plate 113 is disposed above the transport path R of the stencil sheet 101 and has a closed position (the position shown in FIG. 7) for closing the upper part of the transport path R and an open position (the position shown in FIG. 8) for opening the upper part of the transport path R. ).
[0007]
The write head 107 and the upper load roll 109a are located at the press-contact position of the platen roll 106 and the lower load roll 109b when the pressure plate 113 is closed, and at the separated position between the platen roll 106 and the lower load roll 109b when the pressure plate 113 is open. It has become. Further, the write head 107 is positioned with respect to the platen roll 106 in the pressure contact position by head positioning means (not shown) in the axial direction of the platen roll 106 and the direction orthogonal to the platen roll 106 (the direction of transport of the base paper).
[0008]
In the above configuration, when the stencil making operation is selected, the platen roll 106 and the lower load roll 109b rotate together to move the stencil sheet 101 along the transport path R. The writing head 107 thermally perforates the stencil sheet 101 to be moved to an appropriate position to form a perforated image based on the image data.
[0009]
By the way, in the stencil printing apparatus, in order to perform the work of replacing the stencil sheet 101 and the maintenance of the stencil making unit 100 (the operation of releasing the jamming of the stencil sheet 101, etc.), the pressure plate 113 needs to be set to the open position as shown in FIG. However, when the stencil printing machine itself is installed in a narrow space, the workability is poor.
[0010]
In view of this, the present applicant has developed a stencil printing machine in which the stencil making unit is configured as a stencil making unit and the stencil making unit is provided so as to be able to be pulled out in the axial direction of the platen roll with respect to the machine housing. In other words, no matter how narrow the stencil printing machine is installed, the position where the user stands can be secured as an open space. This facilitates the maintenance of the plate making unit.
[0011]
[Patent Document 1]
JP-A-6-255226
[Problems to be solved by the invention]
However, in a device in which the plate making unit can be pulled out in the same direction as the axial direction of the platen roll, the position of the platen roll in the axial direction with respect to the device housing may be shifted due to rattling of the lock mechanism or the like. When the platen roll is displaced in the axial direction, the write head positioned with reference to the platen roll is displaced, so that the image position of the stencil sheet is displaced, and the image position of the printing paper is displaced. In other words, it is necessary to adjust the image position of the printing paper every time the plate making unit is pulled out, which is extremely inconvenient. In particular, in the case of performing the overprinting, if the plate making unit is pulled out during the overprinting, a printing position shift occurs, which causes an image defect.
[0013]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and is directed to an apparatus in which a plate-making unit can be pulled out. It is an object of the present invention to provide a stencil printing apparatus which is always positioned at the same position, and does not cause various problems due to a shift in the image position of the stencil sheet.
[0014]
[Means for Solving the Problems]
The invention according to claim 1 provides a plate making unit having a platen roll and a write head movably provided between a pressure contact position for pressing the platen roll and a separated position for separating the platen roll from the apparatus housing. In a stencil printing apparatus provided so as to be able to be pulled out in the axial direction, the stencil printing apparatus has head positioning means for positioning the writing head on the platen roll, and the platen shaft of the platen roll is movable in the axial direction, and the plate making is performed. The unit is urged by the urging means in the direction of the accommodation set position, and at the accommodation set position, the distal end of the platen shaft is brought into contact with the position reference member of the apparatus housing under the urging force of the urging means. It is characterized by the following.
[0015]
In this stencil printing apparatus, when the stencil making unit pulled out of the apparatus housing is returned to the accommodation set position in the apparatus housing, the platen roll is positioned at the accommodation set position based on the apparatus housing, and the write head is placed on the positioned platen roll. The write head is positioned by the head positioning means, and as a result, the write head is positioned with respect to the apparatus housing. Therefore, the axial position of the write head is always positioned at the same position with respect to the apparatus housing regardless of whether the lock mechanism of the plate making unit is loose or the like.
[0016]
According to a second aspect of the present invention, in the stencil printing machine according to the first aspect, the tip of the platen shaft and the position reference member abut substantially by point contact.
[0017]
In this stencil printing apparatus, in addition to the effect of the first aspect, the rotation resistance of the platen roll is reduced.
[0018]
According to a third aspect of the present invention, in the stencil printing machine according to the first or second aspect, the head positioning means includes a V-shaped groove liner having a V-shaped groove provided on the platen shaft, and the writing head. In the press-contact position, the liner locking claw is locked in the V-shaped groove of the V-shaped groove liner to restrict the movement of the platen roll in the axial direction. And in the separated position, the liner locking claw is separated from the V-shaped groove liner to release the positioning.
[0019]
In this stencil printing apparatus, in addition to the operation of the first or second aspect of the present invention, the liner locking claw is locked to the V-shaped groove liner while the writing head is shifted from the separated position to the press-contact position. Since the head is positioned both in the axial direction of the platen roll and in the direction perpendicular thereto, the write head can be moved between the separated position and the pressure contact position, and in the pressure contact position, the write head can be moved relative to the platen roll. Positioning can be performed with high positional accuracy.
[0020]
According to a fourth aspect of the present invention, in the stencil printing apparatus according to the first or second aspect, the head positioning means has a circumferential surface liner provided on the platen shaft and a V-shaped groove liner. And a first liner locking claw and a second liner locking claw provided on the write head, and the first liner locking claw is locked to the circumferential surface of the circumferential surface liner at the pressure contact position. The second liner locking claw is locked in the V-shaped groove of the V-shaped groove liner to restrict the movement of the platen roll in the axial direction, thereby performing positioning. The first liner locking claw and the second liner locking claw are separated from the circumferential surface liner and the V-shaped groove liner to release the positioning.
[0021]
In this stencil printing apparatus, in addition to the operation of the first or second aspect of the present invention, the first liner locking claw is locked to the circumferential surface liner in the process of shifting the write head from the separated position to the pressed position. In addition, since the second liner locking claw is locked to the V-shaped groove liner and the write head is positioned in both the axial direction of the platen roll and the direction perpendicular thereto, the write head is moved between the separated position and the pressed position. And the writing head can be positioned with high positional accuracy with respect to the platen roll at the pressure contact position.
[0022]
The invention according to claim 5 is the stencil printing apparatus according to any one of claims 1 to 4, wherein the biasing means is a spring.
[0023]
In this stencil printing apparatus, in addition to the effects of the inventions of claims 1 to 4, the platen shaft is urged with a simple structure and with an appropriate urging force.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0025]
1 to 6 show an embodiment of the present invention. FIG. 1 is a front view of a main portion of a stencil printing apparatus in the vicinity of a stencil making unit. FIG. 2 shows the stencil making unit in a drawn-out position and a pressure plate shifted to an open position. FIG. 3 is a front view of a main part of the stencil printing machine showing a state in which the stencil printing unit has been set, FIG. 3 is a side view showing the platen roll and the writing head when the stencil making unit is located at the accommodation set position, and FIG. 5 is a side view showing a platen roll and a write head in FIG. 5, FIG. 5 is a side view showing a state in which the plate making unit is in a pulled-out position and the write head is shifted to a separated position, and FIG. FIG. 3 is a perspective view showing a head positioning unit.
[0026]
1 and 2, a stencil printing apparatus 1 includes a document reading unit that reads the contents of a document as an electric signal, a stencil making unit that thermally perforates a perforated image on a stencil sheet 10 based on the image read by the document reading unit, A stencil sheet 10 made by a stencil making section is wound around a drum 2, a printing sheet is pressed and conveyed to the drum 2 to transfer ink from the perforations of the stencil sheet 10 to the printing sheet, and a printing section for printing on the printing section. A paper feeding unit for feeding paper, a paper discharging unit for discharging printing paper printed by the printing unit, and a plate discharging unit for discarding the stencil sheet 10 used by the printing unit (all not shown). Is mainly provided.
[0027]
The plate making unit is configured as a plate making unit 3, and the plate making unit 3 and the drum 2 of the printing unit are provided so as to be freely drawn out from the front side of the apparatus housing 4 in the same drawing direction. More specifically, the plate making unit 3 has an axial direction T of a platen roll 14 described below set as a pull-out direction, and the drum 2 has an axial direction of a drum shaft (not shown) set as a pull-out direction.
[0028]
As shown in FIGS. 1 and 2, the stencil making unit 3 includes a stencil container 11 for accommodating a stencil sheet 10 wound in a roll, a first tension roll 12 disposed immediately downstream of the stencil sheet 10, A second tension roll 13 disposed immediately downstream of the transport, a platen roll 14 and a write head (thermal head) 15 disposed immediately downstream of the transport, and a lower side immediately downstream of the platen roll 14 and the write head 15 downstream of the transport; , A pair of upper and lower transport rolls 17a, 17b disposed immediately downstream of the reservoir 16 and a base paper cutter disposed immediately downstream of the pair of upper and lower transport rolls 17a, 17b. The stencil sheet 10 is transported between the platen roll 14 and the writing head 15, between the pair of transport rolls 17a and 17b, and the like. It is guided in the vicinity of the drum 2 as.
[0029]
The base paper accommodating section 11, the first tension roll 12, the platen roll 14, the storage box 16, the lower transport roll 17b, and the base paper cutter 18 are supported by the unit housing 20. The second tension roll 13, the write head 15, and the lower transport roll 17a are supported by the pressure plate 21. The pressure plate 21 is rotatably supported by the unit housing 20 via a support pin 22. The pressure plate 21 is disposed above the transport path of the stencil sheet 10 and has a closed position (position shown in FIG. 1) for closing the upper part of the transport path and an open position (position shown in FIG. 2) for opening the upper part of the transport path. It is provided so as to be movable between them. The write head 15 and the upper transport roll 17a are located at the press-contact position of the platen roll 14 and the lower transport roll 17b at the closed position of the pressure plate 21, and at the separated position of the platen roll 14 and the lower transport roll 17b at the open position of the pressure plate 21. Each is located.
[0030]
Next, the draw-out structure of the plate making unit 3 will be described.
[0031]
As shown in FIGS. 3 and 4, the apparatus housing 4 has a front side plate 4a and a back side plate 4b, and the back side plate 4b is configured as a position reference member. A plate making unit opening 9 is formed in the front side plate 4a, and the plate making unit 3 is pulled out through the plate making unit opening 9. The unit housing 20 and the apparatus housing 4 of the plate making unit 3 are connected via first to third guide rails 30a, 30b, 30c which are connected to each other. The plate making unit 3 is guided in the axial direction T of the platen roll 14 by the first to third guide rails 30a, 30b, 30c, and is accommodated in the apparatus housing 4 (position shown in FIG. 3) and drawn out of the apparatus housing 4. It moves between positions (positions in FIG. 4). The guide rails 30a, 30b, and 30c are used to guide the plate making unit 3 in the axial direction T of the platen roll 14, but other than the role of the guide, for example, each of the guide rails 30a, 30b, and 30c. At least one of them is used as a bundle guide that holds a bundle (not shown) that electrically connects the plate making unit 3 and the main body of the stencil printing apparatus 1.
[0032]
The plate making unit 3 and the device housing 4 are provided with a lock mechanism (not shown) for locking the plate making unit 3 to the device housing 4 at the accommodation set position.
[0033]
Next, the configurations of the platen roll 14 and the write head 15 will be described. As shown in FIGS. 3 to 5, the platen roll 14 has a platen shaft 31 fixed thereto, and both ends of the platen shaft 31 are rotatably supported by the unit housing 20 and movably supported in the axial direction T. I have. To the platen shaft 31, a rotational force from a platen driving means (not shown) is transmitted.
[0034]
A compression coil spring (spring) 32 as an urging means is mounted on one end side of the platen shaft 31, and the compression coil spring 32 is interposed between the unit housing 20 and the circumferential surface liner 37. The platen roll 14 is urged by the spring force of the compression coil spring 32 in the accommodation set position direction t1. A stopper 33 is fixed to one end of the platen shaft 31, and the stopper 33 prevents the platen shaft 31 from falling off the unit housing 20. The distal end surface on the other end side of the platen shaft 31, that is, the distal end surface 31a in the accommodation set position direction t1 is formed in a spherical shape whose axis center projects most.
[0035]
The write head 15 is swingably supported by the pressure plate 21 via a head support bracket 35, and as described above, the press-contact position of the platen roll 14 (the position in FIGS. 3 and 4) and the separation position of the platen roll 14 (see FIG. 2 and the position of FIG. 5). Then, the write head 15 located at the pressure contact position is positioned on the platen roll 14 by the head positioning means 36.
[0036]
As shown in FIG. 6, the head positioning means 36 includes a circumferential liner 37 and a V-shaped groove liner 38 provided on the platen shaft 31, a first liner locking claw 39 provided on the write head 15, and a second liner claw 39. And a liner locking claw (liner locking claw) 40. The outer circumference of the circumferential surface liner 37 is formed as a circumferential surface. The V-shaped groove liner 38 has a V-shaped groove 38a at the center. At the pressure contact position, the first liner locking claw 39 locks on the circumferential surface of the circumferential surface liner 37 to restrict the movement in the base paper transport direction S (shown in FIG. 6), and the second liner locking claw 40 moves Positioning is performed by engaging the V-shaped groove 38a of the V-shaped groove liner 38 and restricting the movement of the platen roll 14 in the axial direction T and the movement of the platen roll 14 in the axial direction T. In the separated position, the first liner locking claw 39 and the second liner locking claw 40 are separated from the circumferential surface liner 37 and the V-shaped groove liner 38 to release the positioning.
[0037]
The case where the stencil printing apparatus 1 performs replacement of the stencil sheet 10 or maintenance of the stencil making unit 3 will be described.
[0038]
As shown in FIG. 3, when the plate-making unit 3 is located at the accommodation set position in the apparatus housing 4 and the user releases the lock mechanism and pulls the plate-making unit 3 in the pull-out position direction t2, the plate-making unit 3 is moved. Are guided out of the apparatus housing 4 by the first to third guide rails 30a, 30b, 30c. When the plate making unit 3 is pulled out to the draw-out position in FIG. 4, all the upper surfaces of the plate making unit 3 are opened.
[0039]
Next, as shown in FIG. 2, when the pressure plate 21 is moved to the open position, as shown in FIGS. 2 and 5, the write head 15 is moved to the separated position of the platen roll 14, and the transport path of the stencil sheet 10 is moved. Is partially open. The user can easily exchange the stencil sheet 10 or perform maintenance of the stencil making unit 3 using the open space on the front side of the stencil printing apparatus 1.
[0040]
When these operations are completed, the user returns the pressure plate 21 to the closed position. Then, the writing head 15 is moved to the position where the platen roll 14 is pressed against the recording head. The write head 15 is positioned with respect to the platen roll 14 by the head positioning means 36 in the axial direction T and the base paper transport direction S (shown in FIG. 6) which is a direction orthogonal thereto.
[0041]
Next, when the user presses the plate making unit 3 in the accommodation set position direction t1, the plate making unit 3 is guided by the first to third guide rails 30a, 30b, 30c and is accommodated in the apparatus housing 4. In this movement process, when the leading end surface 31a of the platen shaft 31 of the platen roll 14 comes into contact with the back side plate 4b, and the plate making unit 3 is further pressed from this contact position in the accommodation set position direction t1, the compression coil spring The plate making unit 3 is moved to the accommodation set position against the spring force of 32. When the plate making unit 3 is located at the accommodation set position in FIG. 3, the plate making unit 3 is locked to the apparatus housing 4 by the lock mechanism.
[0042]
As described above, in the stencil printing apparatus 1, when the stencil making unit 3 pulled out of the apparatus housing 4 is returned to the accommodation set position in the apparatus housing 4, the platen roll 14 is positioned with respect to the apparatus housing 4 at the accommodation set position. The write head 15 is positioned on the platen roll 14 by the head positioning means 36, and as a result, the write head 15 is positioned with reference to the apparatus housing 4. Therefore, the position of the writing head 15 in the axial direction T is always positioned at the same position with respect to the apparatus housing 4 irrespective of the backlash of the lock mechanism of the stencil making unit 3, and the image position of the stencil sheet 10 is the same position. In addition, various inconveniences caused by a shift in the image position of the stencil sheet 10 do not occur. That is, there is no need to adjust the image position of the printing paper every time the plate making unit 3 is pulled out, and the usability is good. Further, even if the plate-making unit 3 is pulled out during the overlap printing, the printing position is not shifted before and after the pull-out operation, so that a printed material with a good overlap image can be obtained.
[0043]
In addition, since the distal end surface 31a of the platen shaft 31 has a spherical shape, and the distal end of the platen shaft 31 and the back side plate 4b, which is the position reference member, are almost in point contact with each other, the rotational resistance of the platen roll 14 can be minimized. . Note that the contact portion of the back side plate 4b may be formed in a spherical shape.
[0044]
Further, the head positioning means 36 includes a circumferential liner 37 provided on the platen shaft 31 and a V-shaped groove liner 38 having a V-shaped groove 38a, a first liner locking claw 39 provided on the write head 15, and a The first liner locking claw 39 is locked on the circumferential surface of the circumferential surface liner 37 at the press contact position to regulate the movement in the base paper transport direction S, and the second liner The pawl 40 is positioned by locking the V-groove 38a of the V-groove liner 38 to restrict the movement of the platen roll 14 in the axial direction T. In the separated position, the first liner locking claw 39 and the second Since the liner locking claw 40 is separated from the circumferential surface liner 37 and the V-shaped groove liner 38 to release the positioning, the write head 15 can be moved between the separated position and the pressure contact position, and the pressure contact can be achieved. Calligraphy in position The write head 15 can be positioned accurately positioned relative to the platen roller 14.
[0045]
Further, since the urging means is a compression coil spring (spring) 32, the platen shaft 31 can be surely urged with a simple structure and an appropriate urging force.
[0046]
According to the above embodiment, the movement trajectory between the accommodation set position and the draw-out position of the plate making unit 3 is straight, but may be arc-shaped. The write head 15 has been described as being simply supported by the pressure plate 21. However, the write head 15 can be moved to the platen roll 14 by the head moving mechanism in a closed position of the pressure plate 21. You may comprise so that it may be. With this configuration, the writing head 15 can be separated from the platen roll 14 when it is not necessary to apply a nip pressure to the stencil sheet 10, which is preferable.
[0047]
【The invention's effect】
As described above, according to the first aspect of the present invention, the platen shaft of the platen roll is movable in the axial direction, and is urged by the urging means in the direction of the accommodation set position of the plate making unit. In the position, the tip of the platen shaft is brought into contact with the position reference member of the apparatus housing in a state of receiving the urging force of the urging means, so that when the plate making unit pulled out from the apparatus housing is returned to the accommodation set position in the apparatus housing, At the accommodation set position, the platen roll is positioned with reference to the apparatus housing, and the write head is positioned on the positioned platen roll by the head positioning means. As a result, the write head is positioned with respect to the apparatus housing. Accordingly, the axial position of the writing head is always positioned at the same position with respect to the apparatus housing regardless of whether the locking mechanism of the stencil unit is loose or the like, and the image position of the stencil sheet is the same position, and the image position of the stencil sheet is the same. Various inconveniences resulting from the displacement do not occur. This eliminates the need to adjust the image position of the printing paper every time the plate making unit is pulled out, and is convenient. Further, even if the plate making unit is pulled out during the overlap printing, the printing position shift does not shift before and after the drawing operation, so that a printed material with a good overlap image can be obtained.
[0048]
According to the second aspect of the present invention, since the distal end surface of the platen shaft and the position reference member are brought into contact with each other substantially in point contact, the rotation resistance of the platen roll can be reliably reduced.
[0049]
According to the third aspect of the present invention, the head positioning means includes a V-shaped groove liner provided on the platen shaft and a liner locking claw provided on the write head. Since the positioning is performed by engaging the V-shaped groove of the grooved liner and restricting the axial movement of the platen roll, the writing head can be moved between the separated position and the pressed-contact position. In the position, the write head can be positioned with high positional accuracy with respect to the platen roll.
[0050]
According to the invention of claim 4, the head positioning means comprises: a circumferential surface liner and a V-shaped groove liner provided on the platen shaft; a first liner locking claw and a second liner locking claw provided on the write head. In the press-contact position, the first liner engaging claw is engaged with the circumferential surface of the circumferential surface liner to restrict movement in the direction of transport of the base paper, and the second liner engaging claw is engaged with the V-shaped groove liner. Since the positioning is performed by restricting the axial movement of the platen roll by engaging with the groove, the write head can be moved between the separated position and the press-contact position, and the write head can be moved at the press-contact position. Positioning can be performed with high positional accuracy with respect to the platen roll.
[0051]
According to the invention of claim 5, since the urging means is a spring, the platen shaft can be surely urged with a simple structure and with an appropriate urging force.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, and is a front view of a main part near a plate making unit of a stencil printing machine.
FIG. 2 is a front view of a main part of the stencil printing machine according to the embodiment of the present invention, showing a state in which the plate making unit is at a drawn-out position and a pressure plate is shifted to an open position.
FIG. 3 is a side view showing the embodiment of the present invention and showing a platen roll and a write head when the plate making unit is located at a storage set position.
FIG. 4 is a side view illustrating the platen roll and the write head in a case where the plate making unit is located at a draw-out position, according to the embodiment of the present invention.
FIG. 5 is a side view showing the embodiment of the present invention, and showing a state in which the plate making unit is at the drawn-out position and the write head is moved to the separated position.
FIG. 6 is a perspective view illustrating a head positioning unit that positions the write head with respect to a platen roll according to the embodiment of the present invention.
FIG. 7 shows a conventional example, and is a configuration diagram of a plate making section in which a pressure plate is located at a closed position.
FIG. 8 shows a conventional example and is a configuration diagram of a plate making section in which a pressure plate is located at an open position.
[Explanation of symbols]
Reference Signs List 1 stencil printing machine 3 stencil making unit 4 device housing 4b Back side plate (reference position member)
Reference Signs List 10 stencil sheet 14 platen roll 15 writing head 20 unit housing 31 platen shaft 31a tip surface 32 compression coil spring (biasing means, spring)
36 Head positioning means 37 Circumferential surface liner 38 V-shaped groove liner 38a V-shaped groove 39 First liner locking claw 40 Second liner locking claw (liner locking claw)
T Axial direction of platen roll t1 Storage set position direction

Claims (5)

A plate-making unit having a platen roll and a write head movably provided between a press-contact position pressed against the platen roll and a separation position separated from the platen roll is provided so as to be able to be drawn out in the axial direction of the platen roll with respect to the apparatus housing. Stencil printing machine,
Head positioning means for positioning the write head to the platen roll,
The platen shaft of the platen roll is movable in the axial direction, and is urged by urging means in the direction of the accommodation set position of the plate making unit,
In the stencil printing apparatus, the tip of the platen shaft is brought into contact with a position reference member of the apparatus housing in the accommodation set position while receiving the urging force of the urging means. The stencil printing apparatus according to claim 1,
A stencil printing machine characterized in that the tip of the platen shaft and the position reference member abut substantially by point contact. A stencil printing apparatus according to claim 1 or claim 2,
The head positioning means includes a V-shaped groove liner having a V-shaped groove provided on the platen shaft, and a liner locking claw provided on the write head. Positioning is performed by locking in the V-shaped groove of the V-shaped groove liner to restrict the axial movement of the platen roll. In the separated position, the liner locking claw is separated from the V-shaped groove liner to perform positioning. A stencil printing device characterized by releasing. A stencil printing apparatus according to claim 1 or claim 2,
The head positioning means includes: a V-shaped groove liner having a circumferential surface liner and a V-shaped groove provided on the platen shaft; a first liner locking claw and a second liner locking claw provided on the write head. In the press-contact position, the first liner locking claw locks on the circumferential surface of the circumferential surface liner to regulate movement in the base paper transport direction, and the second liner locking claw moves on the V-shaped groove liner. Positioning is performed by locking the platen roll in the axial direction by locking it in a V-shaped groove. In the separated position, the first liner locking claw and the second liner locking claw are connected to the circumferential surface liner and A stencil printing machine wherein the positioning is released by separating from the V-shaped groove liner. The stencil printing apparatus according to claim 1, wherein
The stencil printing device, wherein the urging means is a spring.

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