JPH07115795B2 - Stacked paper takeout safety device for sheet-fed printing press - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stacked paper takeout safety device for a sheet-fed printing press, which is suitable for use in a lifting chain type plate removing device.

[Conventional technology]

When printing with a sheet-fed printing press, when the number of sheets that are released from the grip of the paper ejection claws and dropped (discharged) on the paper stacking table becomes large, the weight causes the sheets to set-off between the lower layers. Therefore, a plate removing device is provided to prevent this.

As this type of plate removing device, a lifting chain type plate removing device has been developed in recent years. In this device, endless lifting chains that vertically move in synchronization are vertically stretched at four corners of a discharged sheet, and a plurality of pairs of guide rails, one left and one pair, are attached to the lifting chains. It is supported at regular intervals, runs each elevating chain and circulates the guide rail, inserts a plate cutting board (paper discharge table) in sequence into the guide rail that has reached the uppermost position, and discharges it into a single sheet. It lowers while stacking paper. In other words, the stacking plate inserted into the guide rail that has reached the uppermost position is arranged not to receive the discharged sheets, and after stacking a predetermined number of discharged sheets on this platen, the stacking sheet is moved to the uppermost position. A new plate cutting plate is inserted and arranged in the guide rail so that the discharged sheets are continuously received and stacked. Then, after stacking, the plate cutting plates that have descended and reached the predetermined take-out position are taken out of the machine one by one in the order of the stacked paper children.

[Problems to be solved by the invention]

However, according to such a lifting chain type plate removing device, it is necessary to always pay attention to the lowered position of the plate removing plate.
It is necessary to visually confirm that the lowermost lapping plate has reached a predetermined take-out position, and this laminating plate must be taken out together with the stacked sheets before the upper lapping plate descends,
The work was very busy.

[Means for solving problems]

The present invention has been made in view of such a problem, and it descends while receiving a discharged sheet at a discharge table arranged at its drop position, and at the predetermined lowering position, it is at the upper stage position of the discharge table. In a sheet-fed printing press having a paper ejection tray continuous lowering means for continuously receiving the ejected paper sheets on a newly arranged paper ejection tray, a predetermined position of the paper ejection tray located at the lowermost stage is set. An alarm is issued by detecting the excess lowering, and the lowering of the lowermost discharge tray beyond a predetermined limit position lower than the predetermined position is detected to discharge the paper by the discharge tray continuous lowering means. The lowering operation of the table is stopped and the discharge of the sheet is stopped, and the lowering operation of the sheet discharge tray by the sheet discharge tray continuous lowering means can be stopped at an arbitrary timing. Stopping the lowering of the paper tray None As can be released, when the stop cancellation of downward movement of the paper discharge tray is not performed even after the predetermined condition is that so as to interrupt the discharge of the sheet.

[Action]

Therefore, according to the present invention, an alarm is issued at the lowermost position of the lowermost sheet discharge table, and the alarm prompts the timing for taking out the stacked sheets. In addition, if the alarm is prompted to interrupt the lowering operation of the discharge tray, it is possible to calmly take out the stacked sheets during the suspension period of the discharge tray.

〔Example〕

Hereinafter, the stacked paper takeout safety device of the sheet-fed printing press according to the present invention will be described in detail.

FIG. 2 is a schematic front view showing a lifting chain type plate removing device in a sheet-fed printing press. In the drawing, a lifting chain type plate removing device 1 is supported by a column (not shown) and extends horizontally from the front side to the paper back side in the figure in the vertical and horizontal directions 4
Each sprocket shaft 2,3,4,5 has a sprocket shaft 2,3,4,5.
7,8,9 and a sprocket on the back side of the paper (not shown) are axially mounted. Between upper and lower sprockets 6,8 and 7,9
Endless chains 10 and 11 are respectively stretched between them, and endless chains are also stretched between upper and lower sprockets (not shown) on the paper spine side. That is, vertical chains 10, 11 ... Which run in the direction indicated by the arrow A in the figure at points corresponding to the four corners of the discharged sheet in plan view.
Is stretched. Between the front and rear chains, a plurality of L-shaped steel guide rails 12 and 13 are horizontally supported at a fixed pitch via brackets (not shown), and the chains 10 and 11 are synchronized. The guide rails 12 and 13 are configured to rotate in the same phase on the left and right sides by traveling in the same direction. 14 is the left and right guide rails 12, 13
The reference numeral 15 is a sheet cutting plate inserted so as to be supported between the sheets, and 15 is a sheet that has been dropped (discharged) on the sheet cutting plate 14, and the chain 10, 11, ...・ Because the car runs and the empty guide rails 12 and 13 orbit around to the uppermost position, this empty guide rail is
A lathe plate 14 is inserted and arranged on the surfaces 12 and 13. 16 and 17 are
The limit switch is arranged so as to face the descending locus of the plate removing plate 14 inserted and supported on the guide rails 12 and 13. The limit switch is fixed to a bracket (not shown) by changing the vertical position of the actuator. That is, the lower limit switch
The actuator part 17 is arranged at a lower position than the actuator part of the take-out alarm switch 16, and the actuator part of the actuator part by the plate cutting plate 14 at the lowermost position which descends as the chains 10, 11, ... By pushing down, the internal contacts of the take-out alarm switch 16 and the lowering limit switch 17 are closed and opened.

FIG. 1 is a circuit diagram showing an example of the stacked paper sheet taking-out safety device in the planing device 1. That is, the relay A is connected to the power supply lines L1 and L2 via the normally open contact 16a as the internal contact of the takeout alarm switch 16,
The relay D is connected to the power supply lines L1 and L2 via a normally closed contact 17b as an internal contact of the descending limit switch 17. Then, the time delay relay AT and the alarm device 20 are connected to the power supply line L1 via the _normally open contacts A _a1 and A _a2 of the relay A.
Connected to L2 and L2, the series circuit of the normally open contact A _a3 of the relay A and the time-delayed normally closed contact AT _b of the time delay relay AT is
It is connected in parallel to the normally open contact 16a of the take-out alarm switch 16. Reference numeral 21 is a manually operated automatic return type take-out switch, which can be turned on at any timing. Reference numeral 22 is a manual operation automatic return type take-out completion switch, which can be turned off at any timing. The take-out switch 21 and the take-out completion switch 22 are arranged at positions that can be operated externally, and a parallel circuit of the relay C and the time delay relay CT is connected to the power supply lines L1 and L2 via the take-out switch 21. A series circuit of the take-out completion switch 22 and the normally open contact Ca of the relay C is connected in parallel to the take-out switch 21. Then, the power is supplied to the feeder pump contactor FP via the time-delayed normally closed contact CT _{b of the} timed relay CT and the normally open contact D _a1 of the relay D. This feeder pump contactor FP
The sheet is fed to the printing machine by turning on the sheet. Further, power is supplied to the descending contactor DM via the normally open contact D _{a2 of} the relay D, the normally closed contact Cb of the relay C, and the descending switch 23.
By driving the descending contactor DM on, the chains 10, 11 ... In FIG. 2 start traveling, and the guide rails 12, 13 supported by this chain are orbited, that is, inserted into the guide rails 12, 13. As a result, the descending operation of the cut plate 14 thus obtained can be obtained. The lower switch 23
By the ON operation of a paper discharge height detector (not shown) that detects the stacking height of the discharged paper sheets stacked on the plate stacking plate 14 arranged on the uppermost guide rails 12 and 13, which exceeds the predetermined position, It is designed to be turned on for a predetermined time.

Next, the operation of the stacked paper ejection safety device in the plate removing device 1 configured as described above will be described.

When the plate cutting plate 14 is inserted only into the uppermost guide rails 12 and 13 and the printing operation is started, after the printing, the sheet 15 conveyed by the discharge chain is released from the grip of the nail at the conveying end portion. Are discharged and stacked on the planing plate 14. Sheet of paper
By turning on the lowering switch 23 according to the loading of 15,
The descending contactor DM is driven on, and the chain 10,11 ・
・ ・ Synchronously runs at low speed, and the planing plate 14 automatically descends. When a certain amount of sheets 15 are loaded, the next guide rail
As the sheets 12 and 13 orbit from above reach a fixed position, when the sheet cutting plate 14 is quickly inserted into the guide rails 12 and 13 by a manual or automatic insertion device while watching the interval during which the sheet 15 falls, the ejected sheet is released. 15 continues to be received on the planing plate 14. By repeating such an operation, as shown in FIG. 2, the discharged sheets 15 are stacked on the plate cutting plates 14 of the respective stages.

Then, when the plate take-up plate 14 located at the lowermost stage pushes down the actuator portion of the takeout alarm switch 16 as the chains 10, 11 ... Travel, the normally open contact 16a is closed and the relay A is activated. Then, the normally open contacts A _a1 , A _a2 , A _A3 come to be closed. When the normally open contact A _a1 is closed, the timekeeping operation of the time delay relay AT is started, and when the normally open contact A _a2 is closed, the alarm device 20 is activated and an alarm is issued, and the relay A is connected to the normally open contact A _a3 . Self-holding by closing. This alarm 2
The alarm by 0 is given for a certain period of time until the time t ₁ of the time delay relay AT ends. That is, the timed relay AT
When the time measurement at is completed, the time-delaying normally-closed contact AT _{b of the} time-delayed relay AT is opened, and the self-holding of the relay A is released. Therefore, the normally-opened contact A _a2 is opened and power is supplied to the alarm device 20. Is cut off. When an alarm is issued by the alarm device 20 for a certain period of time and the take-out switch 21 is turned on, the relay C is activated and the normally-closed contact Cb is opened, so that power is supplied to the descending contactor DM. The road is blocked,
The automatic lowering operation of the plate lapping plate 14 is interrupted. Here, since the relay C is self-held by closing the normally open contact Ca, the normally closed contact Cb maintains the open state, and the automatic lowering operation of the plate removing plate 14 is continuously interrupted. Then, by utilizing the interruption period of the automatic lowering operation of the plate removing plate 14, the plate removing plate 14 located at the lowermost stage is taken out for each stacked paper, and after taking out the stacked paper, the take-out completion switch 22 is turned off. And When the take-out completion switch 22 is turned off, the self-holding of the relay C is released and the normally-closed contact Cb of the relay C returns to the closed state, so that the cutoff state of the power supply path to the descending contactor DM is restored. The automatic lowering of the plate 14 is resumed. That is, the timing of taking out the stacked sheets is sequentially prompted by the alarm, so that it is not necessary to always pay attention to the descending position of the plate cutting plate 14, and when taking out the stacked sheets, the plate cutting plate 14 is not required.
Since it is possible to temporarily suspend the automatic lowering of 14, it is not necessary to take out the stacked paper before the upper plate is lowered, and it is possible to calmly perform the operation of taking out the stacked paper. it can.

If the extraction switch 21 is turned on in the above,
The time-relay CT starts its timing operation, and the self-holding operation of the relay C closes its normally open contact Ca to continue the timing operation. That is, after the take-out switch 21 is turned on, when the take-out completion switch 22 is not turned off until the timed time t ₂ in the time-relay CT is completed, the time-delay operation normally closed contact CT _b of the time-relay CT is opened. As a result, the power supply to the feeder pump contactor FP is cut off, and the sheet feeding to the printing machine is immediately interrupted. That is, at the time when the timing of the time delay relay CT is completed, the discharge of the sheet to the planing device 1 is interrupted, and by setting the timing time t ₂ to an appropriate value, the topmost planing plate 14 The height of the stacked sheets can be regulated before the machine is stopped or damaged due to the winding of the sheets 15 discharged and stacked on top of the stacked sheets 15. At the board
The safety is ensured in the case where the descending motion of 14 is not canceled for a long time.

Also, despite the alarm being issued, the eject switch 21
If it is not turned on, that is, if the automatic lowering of the plate lapping plate 14 is not interrupted, the take-out alarm switch 16
Subsequently, the actuator portion of the lowering limit switch 17 is pushed down by the planing plate 14. That is, by opening the normally closed contact 17b of the descending limit switch 17, the normally open contacts D _a1 and D _a2 of the relay D are opened, and the power supply passages to the feeder pump contactor FP and the descending contactor DM are cut off. The feeding of sheets to the printing machine and the automatic lowering of the board 14 are forcibly interrupted, and safety is ensured when the takeout switch 21 is not operated even after the alarm is issued.

FIG. 3 is a flow chart showing the operation of the above-mentioned stacked paper takeout safety device. The step numbers are given to the respective parts and their explanations are omitted.

〔The invention's effect〕

As described above, according to the stacked sheet taking-out safety device of the sheet-fed printing press according to the present invention, the discharged sheet is lowered while being received by the sheet discharge tray arranged at the drop position, and the sheet is discharged at the predetermined lowered position. In a sheet-fed printing press having a sheet-discharging table continuous lowering means for continuously receiving the discharged sheet at a sheet-discharging table newly arranged at an upper position of the table, the sheet-discharging located at the lowermost stage thereof. The alarm is issued by detecting the lowering of the tray beyond the predetermined position, and the lowering of the lowermost discharge tray above the predetermined limit position is detected to detect the continuous discharge tray. The lowering operation of the sheet discharge tray by the lowering means is interrupted and the discharge of the sheets is stopped, and the lowering operation of the sheet discharge tray by the continuous sheet discharge tray lowering means can be stopped. With eggplant Since the stop of the lowering operation of the paper tray can be released, and if the stop operation of the lowering operation of the paper output tray is not canceled even after a predetermined condition, the discharge of the sheet is interrupted. If a warning is issued at a lower position than the predetermined position of the paper ejection tray located at the lowermost stage, and the alarm prompts the operator to interrupt the lowering operation of the paper ejection tray at arbitrary timing, It is no longer necessary to pay attention to the lowering position of the stack paper while taking out the stacking paper, and it is also released from the hassle that the stacking paper has to be taken out before the paper ejection tray on the upper part of the stacking paper is lowered.
It becomes possible to calmly perform the work of taking out the stacked sheets.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a stacked sheet taking-out safety device of a sheet-fed printing machine according to the present invention, and FIG. 2 is a lifting chain type plate taking in a sheet-fed printing machine to which the stacked sheet take-out safety device is applied. FIG. 3 is a schematic front view showing the apparatus, and FIG. 3 is a flow chart showing the circuit operation of the stacked paper taking-out safety device shown in FIG. 1 …… Plate removal device, 10,11 …… Chain, 12,13 …… Guide rail, 14 …… Plate removal plate, 15 …… Sheet sheet, 16 …… Ejection alarm switch, 17 …… Down limit switch, 20… … Alarm, 21
…… Eject switch, 22 …… Eject complete switch, AT, CT…
… Timed relay.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B65H 33/18

Claims (1)

[Claims] Claims: 1. The paper sheet is discharged while being received by a paper discharge tray arranged at its drop position, and is lowered at a predetermined lower position by a paper discharge tray newly arranged at an upper position of the paper discharge tray. Paper discharge tray continuous lowering means for continuously receiving the discharged sheets and alarm issuing means for detecting the lowering of the paper discharge tray located at the bottom of the paper discharge tray continuous lowering means beyond a predetermined position and issuing an alarm. And the lowering of the lowermost sheet discharge tray beyond a predetermined limit position lower than the predetermined position is detected, and the lowering operation of the sheet discharge tray by the sheet discharge tray continuous lowering means is interrupted and the sheet is fed. Discharge tray lowering limit detecting means for interrupting the discharge of the sheet, and a discharge tray lowering operation stopping means for stopping the lowering operation of the discharge tray by the discharge tray continuous lowering means at an arbitrary timing, and the discharge tray lowering operation. Discharge by stop means When the lowering operation stop release means for releasing the stop of the lowering operation of the table and the stop release of the lowering operation of the sheet discharge table by the lowering operation stop release means are not performed even after a predetermined condition, the sheet is discharged. A stacked paper take-out safety device for a sheet-fed printing press, comprising sheet-fed sheet ejection interruption means for interruption.