JPH0367819A - Driving method of sheet loading base - Google Patents

Abstract

PURPOSE:To shorten waste time by making an electric motor for driving the sheet loading base of a sheet printing machine switchable from commercial power source to inverter power source, and using inverter power source when transferring an empty loading base. CONSTITUTION:A three-phase commercial power source 51 and an inverter power source 6 higher in frequency than the commercial power source 51 are connected to a terminal 5a on the double pole side of a driving motor 5. The driving motor 5 can select a power source by choosing between an operation side contact 7a of a conventional down relay installed on the commercial power source 51 side, and an operation side contact 8a of a high speed down relay installed on the inverter power source 6 side. When an empty loading base is to be transferred in this constitution, the base is transferred at a high speed by switching to the inverter power source to shorten time loss.

Description

[Detailed description of the invention] [Industrial application field]

The present invention is provided in a paper feed section and a paper discharge section of a sheet-fed processing machine such as a sheet-fed printing machine or a sheet-fed punching machine that processes sheet-like members, and in the paper feeding section, the sheet-fed processing machine sequentially passes the sheets into sheets. The present invention relates to a method for driving a sheet stacking table whose raising and lowering can be controlled in order to supply the sheet materials and to sequentially stack the processed sheet materials at the sheet discharge section.

[Conventional technology]

FIGS. 7 and 8 show an example of a paper feed section of a conventional sheet stacking table 60 of this type, in which sheet members 62 to be processed such as printing are stacked and mounted on a pallet 61. The decrease in the stacking height of the sheet members 62 due to the loading of the sheet members 62 into the sheet processing machine 70 is calculated by
A driving unit 63 using an electric motor 64 provided at Sometimes the lowering switch 66 (
In a), the electric motor 64 (see FIG. 8) is reversed to lower the pallet 61, a new sheet member 62 is mounted, and the above function is repeated. A manual lift switch 67 (a) is also provided for the purpose of position correction.

[Problem to be solved by the invention]

To explain using the example of the paper feed section, when the pallet 61 is raised, the electric motor 64 is required to rotate at a very slow speed in order to correspond to the decrease of each sheet member 62. Become. In addition, in the other state, when the pallet 61 is lowered to load a new sheet member 62, it takes a very long time to reach the fixed position with the slow rotation described above. The time required for this is ineffective time, so-called idle time, so it is desired that it be as short as possible. As a solution to the above-mentioned conflicting demands, in the conventional example, as shown in the wiring diagram of FIG. 8 and the sequential chart of FIG. When ascending, power is supplied to the terminal 84a on the 12-pole side via the operating side contact 64a of the automatic ascending relay 65, and when descending for mounting the sheet member 62, that is, during air transport, the descending relay is supplied to the terminal 84b on the 2-electrode side. By supplying power through the operating side contact 84a of the motor 66 and switching between the two, the rotational speed of the electric motor 64 during air feeding is increased to shorten the invalid time as much as possible. However, this sheet stacking table 60 is designed with the above-mentioned paper feeding characteristics as the primary consideration, and the electric motor 64 is provided with a deceleration mechanism and the like corresponding to this.
Even after the above-mentioned countermeasures have been taken, the occurrence of the invalid time still causes a problem that cannot be ignored, and a solution to this problem has been a problem. Note that the reference numeral 67a in FIG. 8 is the operating side contact of the ascending relay 67 for the above-mentioned position adjustment.

[Means to solve the problem]

As a specific means for solving the above-mentioned conventional problems, the present invention provides a drive for a sheet loading platform that is provided in a sheet feeding section and a sheet discharging section of a sheet wafer processing machine, and whose raising and lowering are controlled by an electric motor. To provide a method for driving a sheet wafer loading platform, wherein the electric motor is switchable between a commercial power source and an inverter power source, and when the sheet loading platform is air-transferred, the motor is switched to the inverter power source side. This solves the conventional problems mentioned above.

[For production]

According to the present invention, by adopting a drive method in which the drive motor is controlled by an inverter power supply during air transport of the sheet loading platform, the speed of the drive motor during air transport can be freely controlled and the above-mentioned invalid time can be shortened. It is something.

【Example】

Next, the present invention will be explained in detail based on embodiments shown in the drawings. What is shown in FIG. 1 and FIG. 2 is the paper feed section sheet stacking table 1 and its electrical connection diagram. The pallet 3 is similar in that its raising and lowering is controlled by a drive motor 5 of the pole number switching type via a drive mechanism 4 such as a speed reducer similar to that explained in the conventional example, but according to the present invention. As shown in the wiring diagram of FIG. 2, in addition to a conventional three-phase commercial power source 51, an inverter power source 6 with a higher frequency than the commercial power source 51 is provided at the two-pole side terminal 5a of the drive motor 5, for example. The drive motor 5 is powered by either power source 5116 by selecting the operating side contact 7a of the normal falling relay 7 provided on the commercial power source 51 side and the operating side contact 8a of the high speed descending relay 8 provided on the inverter power source 6 side. The drive type is also freely selectable. Incidentally, the drive motor 5 is provided with an operating side contact 9a of a rising relay 9 that applies the polarity of the commercial power source 51 to the terminal 5a on the bipolar side in the same way as in the conventional example. An automatic rising relay 10 is connected to the terminal 5b on the 12-pole side.
Needless to say, an operating side contact 10a is provided, and switching is performed as appropriate depending on the operating state of the pallet 3. Further, according to the present invention, the sheet feeding unit sheet stacking table 1 is set by an upper limit switch 11 and a lower limit switch 12, which are also provided in the conventional example, at the upper and lower limits of the pallet 3, as shown in FIG. A start-side proximity switch 14 and a stop-side proximity switch 15 for detecting the proximity of the pallet 3 are provided inside the operating range of the pallet 3. Next, the operation of the sheet feeding unit sheet stacking table 1 having the second configuration will be explained with reference to the sequential chart shown in FIG. In the figure, the start-side proximity switch 14 is a logical product of the operating contact 10a of the automatic double-up relay 10, the non-operating contact 7b of the normal descending relay 7, and the non-operating contact 9b of the ascending relay 9. This start-side proximity switch 14 is connected to the start relay 16 at the same time as
Since the operation side contact 16a of the start relay 16 and the non-operation side contact 17b of the stop relay 17, which will be explained later, are logically summed, the normal falling relay 7
and, when the second lift relay 10 is inoperative and the pallet 3 reaches a predetermined position through the operation of the drive motor 5 due to the operation of the automatic lift relay 10 and the start side proximity switch 14 is turned on, the start relay is activated. 16 is in an operating state, and by closing the operating contact 16a, the start relay 16 maintains its state regardless of the state of the start-side proximity switch 14 thereafter. Here, if the manual lowering switch ↓8 is turned on, the logical product of the non-operating contact 7b of the normal lowering relay 7, the non-operating contact 17b of the stop relay 17, and the operating contact 1t3a of the start relay 16 is established. The high-speed lowering relay 8 operates to apply the high frequency from the inverter power supply 6 to the drive motor 5 to perform a high-speed lowering operation of the pallet 3, and is logically ORed with the manual lowering switch 18. This operation is continued by the operation side contact 8a of the high-speed descending relay 8 which has been operated. When the pallet 3 reaches the stop side proximity switch king 5 due to the above-mentioned lowering operation, the stop relay 17 is activated by turning on the stop side proximity switch 15, and the non-operating side contact 17b of the stop relay 17 is opened. The high-speed descending relay 8 then becomes inoperative, and the drive motor 5 is thereby stopped. Further, the normal descending relay 7 is constructed by performing a logical product between the non-operating contact 8b of the high-speed descending relay 8 and the non-operating contact 16b of the start relay 16. Therefore, it is possible to lower the pallet 3 at a low speed by turning on the manual lowering switch 18 in the operating range of the pallet 3 where the start side proximity switch 14 is not activated. Since it is expected that the lowering will be performed in a narrow range such as fine adjustment, the operation side contact 7a of the normal lowering relay 7 is not logically ORed with the manual lowering switch 18.
As a result, the lowering is performed only while the manual lowering switch 18 is pressed. Incidentally, since the rising relay 9 and the automatic rising relay 10 are the same as those in the conventional example, a detailed explanation thereof will be omitted here. What is shown in FIGS. 4 and 5 is an example in which the present invention is applied to a sheet stacking table 21 in a sheet discharge section. As in the conventional example, the pallet/soto 23 is driven up and down by a delivery motor 25 via a drive mechanism 24, but there is a difference in this embodiment. However, as in the previous embodiment, the delivery motor 2
5 is provided with an inverter power source 26 in addition to the commercial power source 51, and this delivery motor 25 is connected to the operating side contact 27a of the normal rising relay 27 provided on the commercial power source 51 side and the high speed rising relay provided on the inverter power source 26 side. In addition to selecting the active contact 28a of 28, driving by any power source 51.6 can be freely selected. Incidentally, the delivery motor 25 is normally a single motor, and is lowered at an appropriate speed according to the amount of the sheet members 22 discharged by the operation side contact 29a of the automatic lowering relay 29. There is. Further, according to the present invention, the sheet discharge section sheet stacking table 21 is provided with a start side proximity switch 30 and a stop side photoelectric switch 31 at appropriate positions similar to those in the previous embodiment. Since the required fast forwarding direction is different from that of the sheet feeding unit sheet stacking table 1 described above, the start side proximity switch 30 is provided at the lower position, and the stop side photoelectric switch 31 is provided at the upper side. There is. The operation of the sheet discharge section sheet stacking table 21 configured as described above will be explained with reference to the sequential chart shown in FIG. Since the automatic lowering relay 29 is connected to the start relay 32 in a state in which a logical AND operation has been performed with the operation side contact 29a, when the start side proximity switch 30 detects the pallet 23, the start relay 32 is activated. This closes the operation side contact 32a, and the operation side contact 32a is ORed with the start side proximity switch 30 and maintains the state. Incidentally, the operating side contact 32a is ANDed with an operating side contact 33a of a stop relay 33, which will be explained later. The high speed rising relay 28 includes the normal rising relay 27.
the non-operating contact 27b of the start relay 32, the operating contact 32a of the stop relay 33, and the operating contact 3 of the stop relay 33.
Since the logical product with 3a is connected,
If the manual rise switch 34 is turned on after the start side proximity switch 30 responds by detecting the pallet 23, the high speed rise relay 28 responds and closes the operation side contact 28a.
and connect the delivery motor 25 to the inverter power supply 2.
The pallet 23 is rotated at high speed by the high frequency of 6, and the pallet 23 is moved upward. The above state continues, and the stop side photoelectric switch 3
1 is blocked by the pallet 23, for example, the operation of the stop relay 33 is stopped, so the high-speed rise relay 28 is also stopped from responding, and the delivery motor 25 is also stopped. Incidentally, if the manual rise switch 34 is operated in a state where the start side proximity switch 30 does not respond, the non-operation side contact 28b of the high-speed rise relay 28 and the non-operation side contact 32b of the start relay 32 are logically multiplied. The normal rise relay 27 responds and the manual rise switch 34
The operating side contact 27a of the normal rising relay 27 causes the delivery motor 25 to switch to the commercial power supply 5 only while the
1, and the pallet 23 is raised at a low speed. In this embodiment, in order to avoid duplicating and complicating the explanation, explanations of parts similar to those of the conventional example or the previous embodiment, such as upper and lower limit switches, are omitted. In any of the embodiments described above, the inactive time is shortened by driving the inverter power supply 6.26 during idle time during idle time, and the paper feed section Inverter power supply 6.26, start side proximity switch 14.30, and stop side proximity switch 1 on the sheet wafer loading table 1 or the sheet wafer loading table 21 in the sheet discharge section
5. Since a small number of parts such as the stop-side photoelectric switch 31 are added and small-scale circuit changes are made, the existing paper feed section sheet stacking table 1 or the paper ejection section sheet stacking table 21 will be modified. This also makes it easy to implement.

【Effect of the invention】

As explained above, according to the present invention, the electric motor is configured to be capable of switching between a commercial power source and an inverter power source having a higher frequency than the commercial power source, and when the sheet wafer loading platform is air-transferred, the sheet wafer loading platform is switched to the inverter power source. By adopting the method of driving the loading platform, the electric motor is rotated at a higher speed during air feeding, which is idle time, and the time for air feeding is shortened, making it possible to improve the production of sheet-fed processing machines such as sheet-fed printing machines, for example. It has an extremely excellent effect on improving efficiency, and at the same time, it is easy to obtain the above effect by adding a small number of parts and making small-scale circuit changes, which reduces implementation costs and improves practicality. It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the method for driving a sheet stacking table according to the present invention using an example of a paper feed section, FIG. 2 is an electrical wiring diagram of the same embodiment, and FIG. 3 is the same embodiment. FIG. 4 is a perspective view showing an example in which the present invention is implemented in a paper discharge section, FIG. 5 is an electrical wiring diagram of the same embodiment, FIG. 6 is a sequential chart of the same embodiment, and FIG. 7 is a sequential chart of the same embodiment. The figure is a perspective view showing a conventional example as an example of a paper feed section, FIG. 8 is an electrical wiring diagram of the same conventional example, and FIG. 9 is a sequential chart of the same conventional example. 1 ---------- 1 sheet feed section sheet stacking table 2.22 ------- Sheet member 3.23 -------・Pallet 4.24 ------- - Drive mechanism 5 --- Drive motor 6.26 --- Inverter power supply 7 ---
---Normal descending relay 8-----1 High-speed descending relay 9------ Rising relay 10---1 Automatic ascending relay 14.30-- --Start side proximity switch 1
5 Stop side proximity switch■6.32---Start relay 17.33
---------- Stop relay 18 - - - Manual lowering switch 21 - - - Paper discharge section sheet stacking table 25 - - Delivery motor 27 ------- Normal rising relay 28 - - High-speed rising relay 29 - - Automatic descending relay 31 - Stop side photoelectric switch 34 - −
-------1 manual" 1 ascending switch 51-------1 commercial power supply

Claims (1)

[Claims] In a method for driving a sheet loading platform which is provided in a sheet feeding section and a sheet discharging section of a sheet wafer processing machine and whose raising and lowering are controlled by an electric motor, the electric motor is switchable between a commercial power source and an inverter power source, A method for driving a single wafer loading platform, characterized in that when the single wafer loading platform is air-feeding, the power source is switched to the inverter power source side.