JPS6253874A - Ink quantity detector for rotary stencil duplicator - Google Patents

Abstract

PURPOSE:To enable the predetermined quantity of an ink to be automatically supplied, by operating an ink-supplying device by an electrical signal obtained through conversion by a proximity sensor or proximity switch which detects operating and closing actions of a projected part and a notched window of the first and second disks according to the difference in rotating frequency between the disks. CONSTITUTION:When the quantity of an ink on form cylinders 1, 1' is decreased with the progress of printing and the frictional resistance on the form cylinders is increased, the rotating frequency of an ink quantity detecting roller 2 is increased, and becomes higher than that of the disk 11 which is rotated with a fixed reference speed ratio. A projected part 23 of a disk 22 connected direct to the roller 2 comes into contact with a fastening piece 15 of the disk 11, the notched window 14 of the disk 11 is closed by the projected part 23 of the disk 22, and the light from a photosensor 25 is thereby interrupted, whereby a solenoid is operated. As a result, a pump is operated, and an ink sucked from an ink tube is supplied to the form cylinders 1, 1'.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an ink amount detection device for a rotary copying machine.

Conventional technology Generally, in rotary copying machines in which ink is supplied from an ink tube to a printing plate cylinder by a pump, ink is supplied to the printing plate cylinder by pressing the ink supply key while checking the printing status of the printed material. You can replenish ink to the printing plate cylinder by pressing a button or switch to activate the pump, or periodically replenish ink when a predetermined number of sheets have been printed depending on the number of printed materials, or by operating the ink amount detection roller. It is known to replenish ink by electrically controlling fluctuations in rotational speed using a comparison circuit or the like via a speed generator.

Problems to be Solved by the Invention However, replenishing ink according to the printing conditions and the number of prints is troublesome and cumbersome because the printing conditions are not constant, and it also requires an electrical control mechanism. The devices used have drawbacks such as large edges, complicated configurations, and high prices.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an ink amount detection roller that is pressed against a printing plate cylinder through an ink layer, in order to solve the problems in the prior art.

Comparatively detects changes in the rotation speed of the printing plate cylinder.

An object of the present invention is to provide an ink amount detection device for a rotary copying machine, which has a simple structure and operates an ink supply device to supply ink.

Means for Solving the Problems In order to achieve the above-mentioned object of the present invention, an ink amount detection device for a rotary copying machine constructed according to the present invention is applicable to a rotary copying machine in which ink is supplied to a printing plate cylinder by an ink supply device. In a mimeograph machine, an ink image detection roller is installed at the shaft end of the roller, which is pressed against the outer peripheral surface of the printing plate cylinder through an ink layer and whose rotational speed relative to the printing plate cylinder changes depending on the amount of ink, and partially protrudes from the periphery in the radial direction. a small-diameter first disk having a protrusion that rotates from the printing plate cylinder shaft via a transmission mechanism at a preset constant rotation speed; a large-diameter second disk having a notched window corresponding to the part and a locking part provided to engage with the protruding part; a protruding part of both discs corresponding to the difference in the rotational speed of the first and 20th discs; and an ink supply device operated by an electrical signal converted by a proximity sensor or proximity switch that detects the opening/closing action of the cutout window.

Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Embodiments FIGS. 1 to 3 show an embodiment of a rotary copying machine in which an ink amount detection device of the present invention is implemented, and a pair of ink amount detection devices are installed for printing plate cylinders 1 and 1'. Roller 2, 2'
are pressed together through an ink layer, and these printing plate cylinders 1
, 1', that is, the printing plate cylinder 1, and one of the ink amount detection rows 22, 2', that is, the ink amount detection roller.

Further, in this embodiment, the ink amount detection roller also serves as an ink mixing roller. First, a belt 4. A driving pulley 7 is provided which is driven via a two-stage pulley 5 and a belt 6 at a reduced speed to a constant reference rotation speed. This pulley 7 is fixed to a shaft 8 provided coaxially with the ink amount detection roller 2,
A disk 11 is fixed to the shaft end of the shaft 8. A disc 11 fixed to the end of the shaft 8 is provided with a cutout window 14, and the disc 1 is provided with a cutout window 14 to form the cutout window 14.
A locking portion 15 is provided by bending a portion corresponding to the notch window 1 inward.

A small-diameter disk 22 is fixed to the end of the shaft 21 of the ink amount detection roller 2 in correspondence with such a disk 11 on the driving side. As clearly shown in FIG. 2, this disk 22 has a smaller diameter than the disk 11 and is provided with a projection 23 that projects outward in the radial direction. can be engaged with the locking portion 15 of the disk 11.

In addition, the cutout window 14 of these disks 11 and the disk 22
A magnetic sensor or photosensor 25 is provided corresponding to the protrusion 26 of the disc 11, and a light emitting part and a light receiving part are connected by utilizing a shutter effect based on the opening and closing action of the cutout window 14 of the disk 11 and the protrusion 23 of the disk 22. A photosensor 25 consisting of a photo sensor 25 converts the passage of light into an electrical signal to control and operate a solenoid 26 (FIG. 3), which will be described later. Of course, either a photo sensor or a magnetic sensor can be used.

Note that it is preferable that the reference speed ratio of the disk 110 on the drive side is determined to be a speed ratio that is somewhat lower than the maximum rotational speed of the ink amount detection row 22.

As an embodiment of the present invention, the operation of the solenoid 26 by the magnetic or photo sensor 25 of such an ink amount detection device is transmitted to the actuation lever 27 of the actuation mechanism 31 of the ink supply pump 30 shown in FIG. This is done automatically to replenish ink. That is, the operating mechanism 31 of the ink supply pump 30 has an operating lever 27 which is operatively connected to the solenoid 26, and an ink tube 340 whose lower end is engaged with the end of the piston rod 65 of the ink tube 340 connected thereto. swing lever 66
and a connecting arm 67 having one end connected to the upper end of the swinging lever 36 and having a locking pin 38 at the other end, and a notch 40 with which the locking pin 68 of the connecting arm 37 can freely engage, and reciprocating in the horizontal direction. The guides 42 and 43 include a horizontal operating ring 39 that is held and guided horizontally, and an upper end connected to the other end of the horizontal operating ring 39 via a triangular pivot bracket 44, and a lower end that is connected to the eccentricity of the drive gear 46. The operating arm 45 is connected to a body 47 and is constantly moved up and down.

In the ink amount detection device for a rotary copying machine of the present invention constructed in this manner, as shown in FIGS. 1 and 2, the printing plate cylinder 1 is driven at a constant speed by an electric motor (not shown). The side disk 11 is connected to a pulley 3° /l/ ) 4, a pulley 5, and a belt 6, which is directly connected to the printing plate cylinder 1.
, pulley 7, and shaft 8, are always rotated at a constant speed ratio.

On the other hand, the rotation speed of the ink amount detection rows 22, 2', which are pressed against each other through the printing plate cylinder 1.1' IC ink layer, changes depending on the amount of ink, and when there is a sufficient amount of ink, the printing plate cylinder 1,
The frictional resistance between roller 1' and ink amount detection roller 2 is reduced.
The rotation speed is slow.

Therefore, the disk 22 directly connected to the ink amount detection roller 2
I suspect that disk 1 rotates slower than disk 11 on the drive side.
With the cutout window 14 of No. 1 open, both disks 11 and 22 are in a rotating state.

It is in a state where light from the photosensor 25 can pass through. Therefore, the first operating lever 27 is held in the position shown in FIG. 3, and in this state of the first operating lever 27 the horizontal operating ring 39
The notch 40 of the connecting arm 37 is disengaged from the pin 38 of the connecting arm 37, and the horizontal operating ring 69 only moves idly, so that the pump 30 is not operated yet.

As printing progresses, the amount of ink on the printing plate cylinders 1 and 1' decreases (as a result, the frictional resistance with the printing plate cylinders increases).

The rotation speed of the ink amount detection roller 2 increases, and eventually becomes faster than the rotation speed of the disk 110, which rotates at a constant reference speed ratio. At this time, the protrusion 23 of the disk 22 directly connected to the ink amount detection roller 2 comes into contact with the locking piece 15 of the disk 11, the cutout window 14 of the disk 11 is closed by the protrusion 23 of the disk 22, and the photo sensor 2
Since the light of 5 is blocked and the solenoid 26 is activated,
This causes the actuating lever 27 to pivot counterclockwise as viewed in FIG. As the notch 40 engages with the pin 38 of the connecting arm 57, the swinging lever 36 is raised via the connecting arm 37.
, the piston rod 35 is moved to operate the pump 30, and ink is sucked from the ink tube S4 to replenish the printing plate cylinders 1 and 11 (FIG. 3).

When ink is replenished and a sufficient amount of ink is replenished onto the printing plate cylinders 1 and 11, the frictional resistance with the printing plate cylinders decreases and the ink amount detection roller 2. The speed of ``2'' becomes slow, and the cutout window 14 of the disk 11, which rotates rapidly as described above, is opened, and the horizontal operating ring 39 is opened as described above.
The notch 40 is disengaged from the pin 38 of the connecting arm 37, the pump 30 is stopped, and ink replenishment is completed.

Another embodiment using a magnetic sensor is shown in FIG. In this embodiment, a magnetic sensor 25' is provided at the position of the photo sensor in the previous embodiment, and the cutout window 14 is provided with a magnetic sensor 25'.
A disc 11' having a locking part 15' and a magnet 23' is made of a magnetically impermeable material, and a magnet 23'a is provided on a protruding part 23' of the disc 22', and a magnet 23'a is provided outwardly from the front and rear edges of the protruding part 23'. A folded bend 23'' is provided to act as a stop.

In this case, the magnet 23'a is attached to the protrusion 23 of the disk 22'.
′, the cutout window 1 of the disk 11′
4', the protrusion 23' of the disc 22' is connected to the disc 11'.
The magnetic sensor is activated when it comes into contact with the locking portion 15'.

The same sensor is activated when the cutout window 14' is open.

It will be blocked by magnetic force.

Therefore, the operating relationship of the solenoid 26 is opposite to that of the previous embodiment, that is, when the sensor is activated, the solenoid is activated, and when the sensor is blocked by magnetic force, the solenoid is released from the activated state. .゛Effects of the Invention As described above, according to the ink amount detection device for a rotary copying machine of the present invention, the ink amount detection device for the rotary copying machine of the present invention presses the disk on the drive side, which is rotated at a constant speed ratio on the printing plate cylinder side, into contact with the printing plate cylinder. Utilizes the shutter effect of both disks due to changes in the rotational speed of the disks directly connected to the ink amount detection roller based on the frictional resistance between the ink amount detection roller and the printing plate cylinder through the ink layer, and uses mechanical or electrical means to do this. The information is not transmitted to the operating lever of the ink supply pump's operating mechanism to operate the pump and replenish ink.It has a simple configuration and can be manufactured at low cost, and it reliably operates the ink supply pump to replenish the predetermined amount of ink. This has the advantage of being able to automatically perform the following steps.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a part of a rotary copying machine equipped with an embodiment of the ink amount detecting device of the present invention, and FIG. 2 shows the two disks of the ink amount detecting device of the present invention shown in FIG. 6 is a front view of the operating mechanism of the ink supply pump used in conjunction with the ink amount detection device of FIG. 1, and FIG. 4 is an ink amount detection system of the present invention. FIG. 7 is an exploded perspective view of a disk and a portion of a magnetic sensor in another embodiment of the device. In the figure, 1.1': printing plate cylinder, 2.2': ink amount detection roller, 3, 5, 7: pulley, 4, 6: belt, 8.2
1: Axis, 11, 11': Disk %14: Cutout window,
15: Locking part, 22.22': Disc. 25.23': protrusion, 25: photosensor, 2
5': Magnetic sensor, 26: Solenoid. 27: Actuation lever, 30: Pump, 31 = Actuation mechanism.

Claims (1)

[Claims] In a rotary copying machine in which ink is supplied to the printing plate cylinder by an ink supply device, an ink amount detection roller that is pressed against the outer peripheral surface of the printing plate cylinder via an ink layer and whose rotation speed relative to the printing plate cylinder changes depending on the amount of ink. A small-diameter first disk provided at the shaft end and having a protrusion partially protruding from the periphery in a radial direction, and adapted to be rotated from the printing plate cylinder shaft at a preset constant rotation speed via a transmission mechanism. a second large-diameter hole provided coaxially and adjacent to the small disk and having a cutout window corresponding to the protrusion and a locking portion provided to engage with the protrusion;
The disc is operated by an electrical signal converted by a proximity sensor or proximity switch that detects the opening/closing action of the protrusion of both discs and the notch window according to the difference in the rotational speed of both the first and second discs. An ink amount detection device for a rotary copying machine, characterized by being equipped with an ink supply device.