JPS6228757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate cylinder device for stencil printing, and particularly to a plate cylinder device used in a single cylinder type stencil printing machine.

It includes a porous cylindrical plate cylinder that has a stencil sheet attached to its outer peripheral surface and rotates around its central axis, and an ink supply device supplies printing ink to the inner peripheral surface of the plate cylinder, and the plate cylinder and its A single-cylinder stencil printing machine is configured to transfer the printing ink that has passed through the perforations of a stencil paper attached to the outer circumferential surface of the stencil paper onto a printing medium such as printing paper that is fed by contacting the surface of the stencil paper. It has been known for a long time.

In the above-mentioned single-cylinder stencil printing machine, an ink supply device is generally disposed inside the plate cylinder in order to supply printing ink to the inner peripheral surface of the plate cylinder. An ink container, such as an ink tube, which supplies the ink, and an ink pump, which removes the printing ink from the ink container, are mounted on the body of the printing press. This is shown, for example, in Registered Utility Model No. 56691.

However, in order to change the printing ink color or replace the plate cylinder for maintenance, etc., it is necessary to remove the ink hose that constitutes the ink supply passage that connects the ink pump to the ink supply device each time. , manual work that may stain clothes is required, and in reality, the work of removing the ink hose and then reconnecting the ink hose is a relatively large and troublesome work, and is not recommended for general users. It is said to be difficult to carry out in

On the other hand, it has already been proposed to arrange the ink pump and ink container directly inside the plate cylinder.
This is shown, for example, in Japanese Utility Model Publication No. 15110/1983. If the ink pump and ink container are arranged inside the plate cylinder, the above-mentioned problems will be solved, but
However, the ink pump and ink container rotate together with the plate cylinder as the plate cylinder rotates, and for this reason, it would be fine if the ink pump was a manual type, but even if it is an electric type, it is not possible to use a mechanical type. However, it is difficult to apply driving energy to the ink pump,
Additionally, as the overall weight of the plate cylinder increases, a large driving force is required to drive the rotation of the plate cylinder, resulting in large drive losses.Furthermore, as the inertia of the plate cylinder increases, it becomes difficult to control the plate cylinder to stop at a predetermined rotational position. It becomes difficult.

The present invention solves the above-mentioned problems all at once,
It is an object of the present invention to provide a plate cylinder device for stencil printing which is improved so that even a general user can change the plate cylinder by simple manual operation.

According to the present invention, the present invention provides a cylindrical plate cylinder having a porous circumferential portion, a frame rotatably supporting the plate cylinder, and a frame extending in the axial direction of the plate cylinder. a guiding and holding means that is provided to removably support the frame and guide and hold the plate cylinder together with the frame so as to be movable in the axial direction of the plate cylinder between a printing position inside the machine and a draw-out position outside the machine; an ink container support that is attached to a frame and removably supports an ink container; an ink pump that takes out printing ink from an ink outlet of an ink container that is attached to the frame and supported by the ink container support; This is achieved by a stencil printing plate cylinder apparatus having an ink supply device attached thereto and supplied with printing ink from the ink pump and supplying the printing ink to the inner peripheral surface of the plate cylinder.

According to the configuration described above, the ink container support that supports the ink container, the ink pump, and the ink supply device are all attached to a new frame that rotatably supports the plate cylinder, rather than the plate cylinder or the machine body. These are configured as a single unit, and when changing the color of printing ink, replacing the plate cylinder requires relatively troublesome work such as removing and reconnecting the ink hose even for general users. In addition, even if the ink container support, ink pump, etc. are installed on the plate cylinder side, they do not rotate together with the plate cylinder, and they do not need to be driven to rotate the plate cylinder. No increase in force or inertia.

In addition, in the plate cylinder device according to the present invention, it is possible to arrange the ink container support and the ink pump inside the plate cylinder, and in this case, the ink supply path from the ink container to the ink supply device can be provided. This makes it possible to detect the presence or absence of printing ink in the ink container without a large time delay by detecting the amount of ink in the ink supply device, and to detect the presence or absence of printing ink in the ink container. It is also possible to omit the detection device.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 is a side view partially showing a main part of a stencil printing apparatus equipped with a plate cylinder device according to the present invention, and FIG.
The figure is an enlarged front view of the stencil printing apparatus shown in FIG. 1, and FIG. 3 is a plan sectional view of the plate cylinder apparatus according to the present invention. In these figures, reference numeral 1 designates the body of the stencil printing apparatus, and the body supports a slide bar 3 horizontally by a guide sleeve 2 so as to be movable in the left-right direction as viewed in FIG. As clearly shown in FIG. 2, two slide bars 3 are provided parallel to each other, and a strip-shaped holder post 4 is attached to one end of each bar in a vertical position.
The two holder posts 4 are integrally connected to each other by a connecting member 5 at their lower ends. Support pins 6 and 7 for removably supporting the plate cylinder assembly 10 are attached to the holder post 4, respectively.
That is, the guide sleeve 2 and the slide bar 3 constitute a guide and holding means for the plate cylinder assembly 10.

Further, at the other end of each slide bar 3, a stopper 8 is provided to prevent the slide bar from slipping out of the guide sleeve 2, as shown in FIG.

Plate cylinder assembly 10 includes a cylindrical plate cylinder 11 . The plate cylinder 11 includes a cylindrical body 12 having a porous circumferential portion and open at both ends, an annular guide ring 13 attached to one end of the cylindrical body 12, and a cylindrical body 12.
It consists of an end cover 14 attached to the other end, and a stencil sheet can be attached to the outer peripheral surface of the cylindrical body 12.

Inside the plate cylinder 11 are two band-shaped frame bars 1.
5 are provided parallel to each other in the axial direction, and each of these two frame bars 15 connects to the plate cylinder 11 at one end.
The projecting ends are connected to the front frame 1 by connecting pieces 16, respectively.
It is connected to 7. The front frame 17 is
It has a circular opening 17a for receiving the plate cylinder 11, and is loosely fitted to the outer peripheral portion of the plate cylinder 11 near the one end.
A plurality of guide rollers 18, three in this embodiment, are each rotatably attached to the front frame 17, and each of these guide rollers slides on the outer peripheral surface of the guide ring 13, and rotates the plate cylinder 11. It is rotatably supported from its outer periphery.

As clearly shown in FIG. 3, each of the connecting pieces 16 is hook-shaped when viewed from above, and the connecting pieces 16 cooperate with the one end of the frame bar 15 to receive a U-shaped holder post. 19.

The other end of the frame bar 15 is located near the other end of the plate cylinder 11, as shown in FIG. 3, and these ends are connected to each other by a connecting plate 20. The connecting plate 20 rotatably supports the plate cylinder support shaft 23 by means of a bearing member 22. The plate cylinder support shaft 23 is connected to the hub portion 14a of the end cover 14 at its flange portion 24, and its tip protrudes to the outside of the end cover 14 through a center hole 14b provided in the hub portion 14a. That is,
The connecting plate 20 supports the other end of the plate cylinder 11 by a plate cylinder support shaft 23 so as to be rotatable about its central axis. Further, the plate cylinder support shaft 23 has an axial drive shaft receiving hole 25 and a keyway 26 opened at its tip.

The two frame bars 15 are connected to each other by a connecting plate 21 in the vicinity of the one end inside the plate cylinder 11. The connecting plate 21 and the connecting plate 20 are provided parallel to each other in the axial direction of the plate cylinder 11 and spaced apart from each other. is rotatably mounted around the That is, the ink supply roller 27 is
Rotatably supported by the connecting plates 20 and 21 by a central shaft 28 provided at both ends thereof,
Its outer peripheral portion is in contact with the inner peripheral surface of the plate cylinder 1.
As shown in FIG. 3, a pulley 29 is attached to the central shaft 28 on the side of the connecting plate 20, and as shown more clearly in FIG. An endless power transmission belt 31 is stretched between the pulley 30 attached to the . As a result, the ink supply roller 27 rotates in synchronization with the rotation of the plate cylinder 11 in the same direction as the rotation direction of the plate cylinder, that is, in the counterclockwise direction as viewed in FIG.

Further, a doctor rod 32 is fixed between the connecting plates 20 and 21 along the generatrix of the ink supply roller 27 at a predetermined relatively small distance from the outer peripheral surface of the ink supply roller 27. Doctor Rod 32
The right side as seen in FIG. 2, that is, the ink supply roller 27
An ink supply pipe 33 is disposed at the rear of the ink supply roller 27 in the rotational direction from the opposite part of the ink supply roller 27 and the doctor rod 32.
7, and this printing ink forms an ink reservoir A in a wedge-shaped space defined by the outer peripheral surface of the ink supply roller 27 and the outer peripheral surface of the doctor rod 32. There is.
As the ink supply roller 27 rotates, the printing ink in the ink reservoir A is transferred between the ink supply roller 27 and the doctor rod 32.
The printing ink passes through the gap between the ink supply roller 27 and is metered at that time to form a printing ink layer of uniform thickness on the outer peripheral surface of the ink supply roller 27. This printing ink layer is supplied to the inner peripheral surface of the plate cylinder 11 as the ink supply roller 27 rotates, and is used for printing.

Mounted on the connecting plates 20 and 21 is a connected body of an ink tube support 34 and an ink pump support member 35, which support the ink tube C removably, in other words, in a replaceable manner. The ink tube support 34 is provided at one end with an ink outlet holding plate 36 that removably holds the ink outlet of the ink tube C supported by the support. The entire member plate 35 is located within the plate cylinder 11.
The ink pump support member 35 supports an ink pump 37 and an electric motor 38 that drives the ink pump. The ink pump 37 has its suction port 39 at a position that directly receives the ink outlet of the ink tube C supported on the ink tube support 34, and its discharge port 40 is connected to an ink supply hose 41 for supplying ink. It is connected to the pipe 33.

Further, an ink sensor 43 is provided within the plate cylinder 11 and is supported from the frame bar 15 by a holder 42 . This ink sensor 43 includes a tactile-like detection electrode 44 provided facing the ink reservoir A, and detects the amount of ink in the ink reservoir A in a capacitive manner, and controls the motor 38 based on the detection result. It is designed to control the operation. If a detailed explanation of the ink sensor 43 is desired, please refer to Japanese Patent Application No. 161418/1983 (Japanese Patent Application Laid-Open No. 62520/1982).

The plate cylinder assembly 10 receives the upper end portion of the holder post 4 in the receiving portion 19, and the lower bottom surface of the connecting piece 16 engages with the support pin 6, and the front surface of the front frame 17 is arranged such that the front surface of the support pin 7 1), the holder post 4 is held in a horizontal position as shown in Fig. 1, and in this holding state, the printing inside the machine is It is movable in the direction of its own axis between this position and a pulled-out position outside the machine, which is pulled out to the left in the figure from the printing position.

When the plate cylinder assembly 10 is in the printing position, the drive shaft 45 attached to the machine body 1 enters into and engages with the drive shaft receiving hole 25, and the engagement pin 46 of the drive shaft 25 engages with the keyway 26. By fitting together, the plate cylinder support shaft 23 is connected to the drive shaft 45 in a rotational power transmission relationship. A drive gear 47 is attached to the drive shaft 45.
7 is adapted to be rotationally driven by an electric motor (not shown) via a drive gear train (not shown). The drive shaft 45 is tapered to facilitate engagement with the receiving hole 25, as shown in FIG.

Further, a connector 50 for electrical connection is attached to the front frame 17, and this electrical connector 50 is provided on the machine body 1 and faces it when the plate cylinder assembly 10 is brought to the printing position. It is connected to an electrical connector 51 to conductively connect the electric motor 38 and ink sensor 43 in the plate cylinder 11 to a control device (not shown) provided in the body 1.

Further, the body 1 rotatably supports a press roller 49 via a bracket 48, and the press roller 49 is adapted to come into pressure contact with the outer peripheral surface of the plate cylinder 11.

With the above-described configuration, when removing the plate cylinder assembly 10 in the printing position from the stencil printing machine, grasp the holder post 4 or an appropriate part of the plate cylinder assembly 10 by hand, and move the slide bar 3 to the guide sleeve 2. By pulling out the plate cylinder device 10 to the front, that is, to the left as seen in FIG. 1, in a more slidingly guided state,
The entire plate cylinder assembly 10 together with the holder post 4 is brought out of the machine into a drawn-out position. When the plate cylinder assembly 10 is lifted upward in this drawn-out position, the receiving portion 19 is pulled out from the holder post 4, and the plate cylinder assembly 10 is removed from the body 1 of the stencil printing machine. In this case, the ink tube support 3
4. The ink pump 37 etc. are installed on the front frame 1.
7, frame bar 15, connection plates 20, 21
The plate cylinder assembly 10 is removed from the machine body 1 together with a frame assembly for supporting the plate cylinder.

When installing the plate cylinder assembly 10 that has been removed from the machine body 1 into the stencil printing machine, the plate cylinder assembly 10 is lowered from above the holder post 4 that has been pulled out to the drawing position as described above, and the plate cylinder assembly 10 is lowered into the receiving section 19. to holder post 4
The upper ends are engaged, the lower bottom surface of the connecting piece 16 is engaged with the support pin 6, and the front surface of the front frame 17 is engaged with the tip end surface of the support pin 7. As a result, the plate cylinder assembly 10 is supported by the holder post 4 in a substantially horizontal position at a drawn-out position outside the machine. In this state, the holder post 4 or an appropriate part of the plate cylinder device 10 is grasped by hand, and the plate cylinder assembly 10 is moved into the machine, with the slide bar 3 being slidably guided by the guide sleeve 2. By being pushed to the right as seen in the figure, the plate cylinder assembly 10 moves into the machine along its own axis, and when the plate cylinder assembly 10 is pushed to a position slightly before the printing position, The drive shaft 45 is engaged with the receiving hole 25, and as the plate cylinder assembly 10 is further moved toward the printing position, the pin 46 is engaged with the keyway 26, and the electrical connector 50 is connected to the electrical connector. 51, thereby connecting the support shaft 23 to the drive shaft 45 in rotational power transmission relationship when the plate cylinder assembly 10 is in the printing position, and completing the connection between the electrical connectors 50 and 51; Electric motor 38 and ink sensor 4
3 is electrically conductively connected to the control device. Also, at this time, the plate cylinder assembly 10 contacts the press roller 49 along one roller generatrix at a portion of its outer peripheral surface.

The plate cylinder assembly 10 is given rotational force by the drive shaft 45 and rotates around its own central axis. However, since the frame assembly described above is connected to the machine body 1 and does not rotate, the ink that is supported by it rotates. The tube support stand 34 and the ink tube C, ink pump 37, etc. supported thereon are stationary without rotating.

Although the present invention has been described in detail with respect to specific embodiments above, it will be appreciated by those skilled in the art that the present invention is not limited thereto and that various embodiments can be made within the scope of the present invention. It should be obvious.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional side view of one embodiment of the stencil printing plate cylinder device according to the present invention, and FIG. 2 is an enlarged view of the stencil printing plate cylinder device according to the present invention shown in FIG. The front view and FIG. 3 are plan sectional views of the stencil cylinder device according to the present invention shown in FIGS. 1 and 2. 1... Body, 2... Guide sleeve, 3... Slide bar, 4... Holder post, 5... Connecting member, 6, 7... Support pin, 8... Stopper, 1
0... Plate cylinder assembly, 11... Plate cylinder, 12... Cylindrical body, 13... Guide ring, 14... End cover, 15... Frame bar, 16... Connection piece, 1
7...Front frame, 18...Guide roller, 19...Holder post receiving hole, 20, 21...
... Connection plate, 22 ... Bearing member, 23 ... Plate cylinder support shaft, 24 ... Flange section, 25 ... Drive shaft receiving hole, 26 ... Keyway, 27 ... Ink supply roller, 28 ... Center shaft , 29, 30...Pulley,
31... Endless electric belt, 32... Doctor rod, 33... Ink supply pipe, 34... Ink tube support stand, 35... Pump support member, 36
... Ink outlet holding plate, 37 ... Ink pump, 38 ... Electric motor, 39 ... Suction port, 40
...Output, 41...Ink supply hose, 42...
...Bracket, 43...Ink sensor, 44...
Detection electrode, 45... Drive shaft, 46... Engagement pin,
47... Drive gear, 48... Bracket, 49...
...Press roller, 50, 51... Connector for electrical connection.

Claims (1)

[Claims] 1. A cylindrical plate cylinder having a porous circumferential portion, a frame rotatably supporting the plate cylinder, and a frame extending in the axial direction of the plate cylinder and detachably supporting the frame. and a guide holding means for guiding and holding the plate cylinder together with the frame so as to be movable in the axial direction of the plate cylinder between a printing position inside the machine and a drawer position outside the machine, and an ink container attached to the frame and detachable. an ink container support supported on the ink container;
an ink pump that takes out printing ink from an ink outlet of an ink container that is attached to the frame and supported by the ink container support; A stencil printing plate cylinder device having an ink supply device that supplies ink to the inner peripheral surface of the stencil printing plate cylinder.