JPH085806Y2 - Air flow rate adjusting device in paper feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an air flow rate adjusting device that adjusts the amount of air supplied to a paper feeding device of a printing press according to the operating speed of the printing press. is there.

[Conventional technology]

In a sheet feeding device of a sheet-fed printing press, air is supplied to the stacked sheets by turning on a solenoid valve attached to an air supply passage. That is, the solenoid valve is turned on to open the air supply passage, so that suction and blowing air is supplied to each part of the stacked sheets, and the first suction port is the uppermost sheet (hereinafter simply referred to as paper). ) Is sucked up, the blowing foot presses down the paper underneath, blows air out, separates the upper and lower papers, and the second suction sucks the uppermost paper and feeds it to the feeder board. Then, the operation of separating the next paper by the separating air and sucking the separated paper by the first suction port is repeated, and the continuous sheet feeding to the sheet-fed rotary press is performed.

[Problems to be solved by the device]

However, in such a conventional printing machine, the air supply passage is opened and closed only by switching the solenoid valve on and off, and regardless of the high speed and low speed rotation of the printing machine (this machine), the same flow rate of air is supplied. Since the paper is supplied to the paper feeding device, the supply air flow rate set at the low speed is insufficient at the high speed rotation. Also, in order to deal with this problem, when the supply air flow rate is set at high speed rotation, the air supply time is extended at low speed rotation, resulting in an excessive supply amount and adversely affecting the paper. Will end up.

Further, since the blown air is continuously supplied to the stacked sheets even when the sheet feeding device is stopped, that is, because the circuit configuration is such that the solenoid valve is open and the standby state is satisfied, the remaining stacked sheets are stacked. However, it is troublesome to restart the paper feeding device.

[Means for solving the problem]

The present invention has been made in view of these problems,
A speed detector that sends a speed signal according to the operating speed of the printing machine is provided, and an electric valve is placed in the air supply passage to the paper feeding device that feeds the printing machine, and the speed detector sends out. Based on the speed signal, if the operating speed of the printing press is faster, increase the opening of the motor-operated valve to the supply passage, and if the operating speed of the printing press is slower, increase the opening of the motor-operated valve to the supply passage. When the printing machine is stopped, the opening amount of the electric valve to the supply passage is reduced to zero.

[Action]

Therefore, according to the present invention, according to the operating speed of the printing press, the faster the operating speed of the printing press is, the more the air supply amount to the paper feeding device is increased, and the lower the operating speed of the printing press is, the paper feeding device is increased. The amount of air supplied to the machine is reduced.

Further, when the printing machine is stopped, the electric valve is closed, and the supply of air to the sheet feeding device is blocked.

〔Example〕

Hereinafter, the air flow rate adjusting device in the paper feeding device according to the present invention will be described in detail.

[Embodiment 1] FIG. 1 and FIG. 2 are a side view and a front view of an electrically operated valve portion showing an embodiment of the air flow rate adjusting device. In the figure, 1 is an air supply passage to a sheet feeding device (not shown), and 2 is a valve chamber 1 a communicating with the air supply passage 1.
It is a butterfly valve placed inside. As shown in FIG. 3, the butterfly valve 2 has a valve chamber 1a with its main shaft 2a as a spindle.
A wheel gear 3 is press-fitted and fixed to the tip of a main shaft 2a that is rotatably mounted inside and that projects outward from the valve chamber 1a. A small drive motor 4 is arranged on the outer peripheral gear portion of the wheel gear 3 by engaging a worm gear 5 coupled to the main shaft 4a thereof. That is,
By driving the small motor 4 to rotate, the wheel gear 3 rotates via the worm gear 5, and the rotation of the wheel gear 3 causes the air supply passage 1 of the butterfly valve 2 to rotate.
The opening amount with respect to is variable.

The small motor 4 is designed to be driven via the CPU based on a tachogenerator signal from a speed generator (TG) that generates a voltage corresponding to the rotation speed of a printing machine (this machine) not shown. When the rotation speed of the machine becomes faster, the opening amount of the butterfly valve 2 with respect to the air supply passage 1 is increased, and when the rotation speed of the machine becomes slow, the air supply passage of the butterfly valve 2 becomes The wheel gear 3 is rotationally driven via the worm gear 5 in the direction of decreasing the opening amount with respect to 1. That is, the opening amount of the butterfly valve 2 with respect to the air supply passage 1 is controlled to an optimum value in accordance with the rotation speed of the machine, and the butterfly valve 2 remains open when the paper feeding device is stopped. The air supply passage 1 is controlled to be closed, that is, the opening amount of the butterfly valve 2 with respect to the air supply passage 1 is controlled to be zero.

When the motor-operated valve configured as described above is used, at the time of high-speed rotation of the machine, the butterfly valve 2 is driven in the direction to open with respect to the air supply passage 1, the amount of air passing therethrough increases, and the air supply is increased. The amount of air supplied to the paper device is increased, eliminating the shortage of air during high-speed rotation. Further, at the time of low speed rotation of the machine, the butterfly valve 2 is driven in the closing direction with respect to the air supply passage 1, the amount of air passing therethrough is reduced, and the amount of air supply to the sheet feeding device is reduced. As a result, excessive supply of air during low speed rotation is eliminated. Further, when the paper feeding device is stopped, the butterfly valve 2 closes with respect to the air supply passage 1. Therefore, if this butterfly valve 2 is arranged downstream of the conventional solenoid valve, the solenoid valve is opened. Even in this state, the air supply to the paper feeding device can be prevented, and the disturbance of the stacked sheets due to the blowing air unlike the conventional case does not occur. Therefore, it is possible to easily restart the paper feeding device without any trouble. Further, since this motorized valve can perform its function as a single unit, it can be easily attached to the air supply passage 1 with little processing and labor.

By changing the gear ratio of the wheel gear 3 and the worm gear 5, the opening amount and opening speed of the butterfly valve 2 with respect to the air supply passage 1 can be freely adjusted, and the selection can be made arbitrarily according to the situation. It goes without saying that it is possible. Further, in this embodiment, the circular butterfly valve 2 is attached to the air supply passage 1 and is used. However, for example, a hemispherical valve 6 may be attached and used as shown in FIG. You may comprise.

[Embodiment 2] FIG. 5 is a system diagram for computer control of air flow rate adjustment to a supply device, and FIG. 6 is a block configuration diagram thereof. Further, FIG. 7 is a specific flow chart of the air flow rate adjusting method by the computer control. That is, in FIG. 6, when the start switch 11 of the input circuit 10 is turned on, a start signal is input to the CPU 13 via the interface 12. Receiving this start signal, the CPU 13 starts the operation of the setting program (step 701). In FIG. 6, 14
Is a main motor in this machine, 15 is a speed generator (TG) that generates a voltage according to the rotation speed of the main motor 14, and 16 is a digital value that is an analog value input via this T / G 15. A / D converter that converts to a value, 17 is this A / D
A latch unit that latches a digital value input via the conversion unit 16.

That is, the CPU 13 that started the operation of the program in step 701 fetches a digital value (rotation speed signal) corresponding to the rotation speed of the main motor 14 via the latch unit 17, and this rotation speed signal causes the slow motion of the machine. In steps 702, 703, and 704, it is determined whether the signal is a slow motion signal indicating rotation, a low speed signal indicating low speed rotation, or a high speed signal indicating high speed rotation. When it is determined in step 704 that the signal is a high speed signal, the main motor T / G value corresponding to this rotation speed signal is called (step 705), this T / G value is A / D converted in step 706, and the valve motor is converted. 21 (corresponding to the small drive motor 4 shown in FIG. 1) is converted into a signal value corresponding to the operation amount (step 707). Then, a signal value corresponding to the operation amount of the valve motor 21 is output as X (step
708). This signal value X is converted into an analog value in the D / A converter 19 (step 709). The driver 20 is activated by this converted analog value (step 710), and the valve 22 (corresponding to the butterfly valve 2 shown in FIG. 1) is opened / closed via the valve motor 21 (step 711).

The opening / closing amount (rotation angle amount) of the valve 22 is sequentially detected by the POT sensor 23 (step 712), and the CPU 13 sets the valve opening / closing amount detected by the POT sensor 23 as the POT value Y via the A / D converter 24 ( Step 713) Read. Then, the signal value X in step 708 is converted into a POT value (step
714), steps 708 to 714 are repeated until the read POT value Y and the signal value X converted into the POT value become equal in step 715. That is, steps 708-714
By repeatedly performing, the opening / closing angular position of the valve 22 is adjusted to an appropriate value according to the rotation speed of the main motor 14.

If it is determined in step 702 that the input rotation speed signal is a slow motion signal, the valve motor operation amount corresponding to this slow motion signal is called from the ROM 18 (step 718) and called. The operations in and after step 708 are performed based on the valve motor operation amount. Further, when it is determined in step 703 that the signal is a low speed signal, the valve motor operating amount corresponding to this low speed signal is called from the ROM 18 (step 719), and step 708 and subsequent steps are performed based on the called valve motor operating amount. Is performed.

Further, when the stop of the machine is detected in step 716 after step 715, it is determined that the paper feeding device is stopped,
The valve 22 is closed to stop the air supply to the paper feeding device (step 717).

[Effect of device]

As described above, according to the air flow rate adjusting device in the sheet feeding device according to the present invention, the sheet feeding device that is provided with the speed detector that sends the speed signal according to the operating speed of the printing machine and also feeds the printing machine The motor-operated valve is installed in the air supply passage to the printer, and when the operating speed of the printing machine increases, the opening amount of the motor-operated valve to the supply passage is increased based on the speed signal sent by the speed detector. When the operating speed of is slowed down, reduce the opening amount of the motorized valve to the supply passage,
When the printing machine is stopped, the opening amount of the motor-operated valve to the supply passage is set to zero, so it is possible to automatically adjust the air supply amount according to the operating speed of the printing machine and improve work efficiency. At the same time, the paper feeding situation becomes good.

Further, according to the present invention, when the printing machine is stopped,
Since the electric valve is closed to prevent the air supply to the paper feeding device, the remaining paper is not disturbed when the paper feeding device is stopped, and the paper feeding device can be restarted promptly. .

[Brief description of drawings]

FIG. 1 is a side view of an electric valve section showing an embodiment of an air flow rate adjusting device in a paper feeding device according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a butterfly valve used for this electric valve. FIG. 4 is a perspective view showing the state of attachment to the air supply passage, FIG. 4 is a diagram showing another example of a valve attached to the air supply passage, and FIG. 5 is for computer control of air flow rate adjustment to the sheet feeding device. 6 is a block diagram of the system, FIG.
The figure is a concrete flow chart of the air flow rate adjusting method by this computer control. 1 ... Air supply passage, 1a ... Valve chamber, 2 ... Butterfly valve, 3 ... Wheel gear, 4 ... Small drive motor,
5 ... Worm gear, 13 ... CPU, 14 ... Main motor, 15 ... Speed generator, 21 ... Valve motor, 22 ... Valve.

Claims (1)

[Scope of utility model registration request] 1. A speed detector for detecting an operating speed of a printing press and sending a speed signal according to the operating speed, and an air supply passage for an air feed device for feeding the printing press. An electrically operated valve, and an air flow rate increase control means for increasing the opening amount of the electrically operated valve with respect to the supply passage when the operating speed of the printing machine is increased based on the speed signal sent by the speed detector, Based on the speed signal sent by the speed detector, when the operating speed of the printing machine becomes slow, air flow rate reduction control means for decreasing the opening amount of the electric valve with respect to the supply passage, and the speed detector sending An air flow rate adjusting device in a sheet feeding device, comprising: an air supply stop control means for setting the opening amount of the electric valve to the supply passage to zero when the printing machine is stopped based on a speed signal.