JPS59158262A - Method and device for accelerating sheet of paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a sheet-fed rotary printing press or the like, in which a sheet-fed rotary printing machine or the like is provided on a paper feeding table for feeding sheets one by one, which are conveyed in a scaly manner. sheet of paper,
The present invention relates to a method and apparatus for accelerating the circumferential speed of an impression cylinder in a sheet-fed rotary printing press.

In this type of form, patent number 23 of the Federal Republic of Germany
In the known device described in No. 30,484, sheets arranged in advance on the front and side gauges are arranged below a paper feed table in order to slightly accelerate the sheets and feed them to the main front gauge of the gripping cylinder. A suction roller is used that is rotated, stopped periodically, and then accelerated.

This type of sheet feeding works very well for small size sheets of about 50 x 70 sides up to speeds of 18,000 sheets/hour, but for larger size sheet It is difficult to supply suction air for the sheets in machines with correspondingly large diameter cylinders and thus limited high circumferential speeds. Particularly with smooth, heavy paper or cardboard, slippage occurs between the suction feeder and the sheet, and this slippage increases significantly as the sheet feed rate increases, until the sheet crosses the main front gauge. There is a risk that the provided gripping cylinders will be fed too slowly and that the sheets will not be properly aligned. For this reason, 50×7
It is difficult to feed sheets of 0 Crn size at high speeds of more than 20,000 sheets/hour.

The object of the invention is to provide a sheet rotary press in which the final alignment of the leading edges of the sheets can be achieved with the front gauge of the rotating drum at sheet feed speeds that are lower than the circumferential speed of the impression cylinder. An object of the present invention is to provide a sheet feeding method and device for a printing press.

The method according to the invention solves this problem by accelerating the sheet to be fed to a sheet-fed rotary printing press from a standstill state to a partial speed of the impression cylinder circumferential speed by means of a first sheet-fed acceleration device.
This sheet is then passed through a second sheet accelerator, Grino ξ.
The second sheet accelerator accelerates the sheet to the circumferential speed of the impression cylinder, and then the sheet is delivered to a cylinder rotating at the circumferential speed of the impression cylinder. According to another feature of the method according to the invention, the first sheet is accelerated from a standstill to a partial speed of the impression cylinder circumferential speed, and the sheet is then passed through a second sheet accelerator in a second sheet accelerator. The second sheet accelerator accelerates the sheet to the circumferential speed of the impression cylinder, and then the sheet is delivered to a cylinder rotating at the circumferential speed of the impression cylinder.

The apparatus according to the present invention for carrying out the above-described shunting method is of a perfusion type in which a paper feeding table is provided with a front gauge and a tenth sheet accelerating device, and the tenth sheet accelerating device is , a second sheet accelerator is provided, which is arranged so as to be able to drive at a partial speed of the impression cylinder circumferential speed while remaining stationary during the sheet cycle, which sheet accelerator in each case It is arranged so that it can be driven from the impression cylinder circumferential speed to the full impression cylinder circumferential speed.

The advantage obtained by the method and device according to the invention is that the sheets do not have to be accelerated to machine speed until they are finally aligned by the front gauge. 15. Even for large size sheets, heavy paper and cardboard.
A production speed of 00 sheets or more than 7 hours can be obtained. In addition, even at the maximum speed of the machine, it is avoided that the front part of the sheet is delayed to the front gauge of the drum.Slip between the conveying medium and the sheet, which is difficult to accelerate, is avoided. Since it is maintained within certain limits, the speed difference between the front gage and the sheet to be accelerated is kept small and the sheets can be better delivered towards the front gage. Moreover, according to the invention, all problematic sheet feeding components for sheet-fed rotary printing presses for processing sheets of different sizes, such as front gauges, suction rollers, suction roller transmissions, etc. Others can be used as is for rationalization. The sheet insertion operation always takes place at the same maximum speed in the first acceleration phase, for example 2.877! /second (for example, when the diameter of the plate cylinder is 180 scale, it corresponds to 18.C, 00 sheets and 7 o'clock).

) can be done. If the printing press is equipped with, for example, a 30 own diameter plate cylinder when processing sheets of large size, the speed increases from 180' to 30' in the second acceleration phase.
Accelerated to 0°. In other words, it is accelerated 5/3 times or 4.7 m/sec. The second acceleration stage offers the advantage that the sheet is delivered directly by the suction roller to the impression cylinder or to the front gauge and the grille ξ which are at the speed level of this impression cylinder.

The invention provides, even at maximum machine speed, a reliable suction roller feed within slip limits for a first acceleration phase for transferring the sheet to the gripper cylinder, and then a second acceleration phase to transfer the sheet to the impression cylinder. This is based on the concept of accelerating to a higher circumferential speed. A drum is used for this second acceleration stage. This drum can be used as an alignment drum.
In a known manner, it is provided with a front gage and a glinometer ξ with cover gage action for transferring sheets. The alignment drum rotates periodically at a variable speed. The alignment drum is at a slow speed as each sheet reaches its front gauge, and is accelerated to a higher impression cylinder circumferential speed during approximately half a revolution to deliver the sheet. Impression cylinder rotation direction IC
Depending on the range of its high speed of rotation, the alignment drum either transfers the sheets directly to the impression cylinder or to an interposed transfer cylinder. If a transfer cylinder is involved, this transfer cylinder performs a second acceleration step, whereas the alignment tram rotates constantly at a slower speed. Align the drum to the second
It is advantageous to use it as an accelerator drum. This is because in this way the alignment drum has a larger diameter, which is advantageous for processing cardboard.

Next, the configuration of the present invention will be specifically explained with reference to the embodiments shown in the drawings.

In FIG. 1, sheets l are fed in a scaly manner from a paper feeding table 2 (sheet feeding table) to an auxiliary front gauge 3 and a tension guide 4. A pair of rotating cylindrical suction rollers 5 (first sheet accelerator) is provided below the paper feed table 2.

Each suction roller 5 is connected to an auxiliary front case.
The sheets fed towards the guide 3 and the pull guide 4 are caught in a stationary state by the suction air, and then the sheets are gradually accelerated. The leading edge of each sheet is then forced below the gripper 6 of the alignment drum 7 (second sheet acceleration bag device), at which point the sheet feed rate is lower than the rotational speed of the alignment drum 7. Since they are also dogs, they are brought into line against the main front cage 8 and lined up here. Gripper 6 is then closed. During this sheet alignment operation stage, the alignment drum 7 rotates at a slow speed Vmin. This is because the connecting link block 22 is arranged within the smallest radius of the rotating grooved connecting rod 21 of the spur gear 18, which is eccentrically offset relative to the alignment drum 7. It is. When the alignment drum 7 rotates about half a rotation, the peripheral speed V max, (=
peripheral velocity of the impression cylinder 13) is obtained. Transfer drum 11 subsequently transfers sheet 1 to impression cylinder 13 . At this point, the actual printing process begins. However, the delivery cylinder 11,
It may also be designed as an impression cylinder for reverse printing, which may be carried out in advance by means of a blanket cylinder and a plate cylinder.

FIG. 2 graphically represents the feeding time ratio possible according to the invention for sheets of length 720 mm arranged in a scale-like manner, for example with a spacing of 250 mm each. The vertical axis shows the sheet transport distance with the auxiliary front cage 3 being OL+1++1, and the horizontal axis shows the time angle of the sheet. The first acceleration phase ends when the leading edge of the sheet impinges on the main front cage 8 of the alignment drum 7 after a time angle of 140 DEG of the sheet period (-acceleration axis) has elapsed. The second acceleration stage is from 1400 to 320 on the alignment drum 7.
It is done at a time angle of 0. The trailing edge of a sheet 1 with a length of 720 fins overlaps the starting phase of the following sheet by approximately 400, so that the sheet feed by the suction roller 5 and the leading edge of the sheet in the auxiliary front cage 3 are The sheet alignment must be performed from below the paper feed table 2 (see German Patent No. 2,330,484). For this reason, the retracting guy 1'' located at minus 150 degrees from the front of the auxiliary front gauge 3 is always covered by the traveling sheets 1, and special measures must be taken.

The draw-in guide 4 can be constructed as a known suction-type draw-in guide that acts on the sheet from below, or alternatively, the running sheet 1 can be displaced laterally in a known manner to operate the draw-in guide directly. Give space.

During sheet feeding, the sheets are displaced laterally by slightly (for example 25 tan) laterally displacing the suction roller 5 or the alignment drum 7, or both the suction roller 5 and the alignment drum together. In order that the following sheets do not reach the drawing guide 4 during the drawing process, the spacing between the sheet scales is selected to be 250 mm. By reducing the feed rate of the scaly sheets (indicated by dashed lines), the speed at which the sheets impinge on the auxiliary front cage 3 is reduced;
The alignment time will be extended.

In the graph of FIG. 3 showing the variation of the paper feed time ratio with respect to FIG. 2, the very narrow spacing between the sheets arranged in a scale-like manner is, for example, 150+mn. This spacing is particularly advantageous for feeding sheets at maximum speed, since the risk of splashing on the auxiliary front gauge 3 is reduced. In the embodiment of FIG. 3, the retraction guide 4 is blocked by the passing sheet and by the following sheet in the two-step sheet acceleration according to the invention.

The solution in this case consists in shifting the passing sheet l by a slight amount (25 m+n) in connection with the embodiment of FIG. 2 and using a suction-type retractor which acts from above. In this case, the sheet shifting operation is carried out by periodically shifting the sheet supply element laterally in the first stage or in the second stage or in the first and second stages.

If a conventional or suction suction guide is to be omitted altogether, a two-stage sheet acceleration method according to the invention may be used, which in the first stage is provided with a suction pneumatic feeding device. In this case, each sheet 1 is registered and stored by means of an electronic measuring head when it contacts the auxiliary front cage 3. Then, sheet l
, before being delivered to the gripper 12 of the impression cylinder 13, by moving the suction roller 5 and/or the alignment drum 7 in the axial direction by means of an electronic or hydraulic medium at a predetermined target value. be shifted. The periodically controlled lateral movement is axially aligned with the axis of the suction roller 5 or aligned with the drum 7 (German Patent Application No. 204666).
a main front gauge 8 acting on the axis of the 02) or moving axially on the alignment drum 7;
It works on Gu1 Notsu and Humiliation 6 with .

FIG. 4 shows an embodiment of a transmission for an alignment drum 7 rotating at a variable speed. Patent Application Publication No. 21609
95 Specification i) is provided.

A device for laterally moving the suction roller 5 and the alignment drum 7 is disclosed, for example, in PISO 1000 Patent No. 2330.
484 specification or British Patent No. 727967
It is stated in the specification of the No. However, in particular when using a measuring device for measuring the position of the 111 edge of a sheet, the alignment drum 7 or its gauge 6 and the main front gauge 8 with a corresponding strip can be used. For example, a step motor or a hydraulic surcharge valve may be used to move the valve.

For driving the aligning drum 7, a crank sliding gear, for example, is provided. (Transmissions with rotating double crank transmissions, non-circular wheels or the like may also be used.) The spur gear 16 of the delivery drum 11 is driven in rotation by the main 1 drive. It meshes with a spur gear 17 and a spur gear 18 supported on a journal 20 (pin extension) fixed to the side frame. A connecting rod 21 that extends linearly parallel to the radius rrJ of the spur gear 18 is fixed to the outside of the spur gear 18 . A connecting link block 22 of the crank 23 extends within the groove of the connecting rod 21. The crank 23 is attached to a cylinder pin 24 of the alignment drum 7. This cylinder pin 24 is supported in a hole in a journal 20 fixed to the frame. The rotational axes of the alignment drum 7 and the spur gear 18 extend at right angles to each other and are spaced apart from each other by a distance a. A crank sliding transmission of the type described above moves the aligning drum 7 from a low circumferential speed Vmin, which corresponds to the maximum circumferential speed of the suction roller 5, to a maximum circumferential speed, which corresponds to the circumferential speed of the delivery 12 ram 11 or the impression cylinder 13. V max. This acceleration work is carried out on delivery tram 1.
within 180° of one rotation angle. the other one
Within 80°, the peripheral speed of the transfer drum 11 is the maximum peripheral speed of the suction row 25 (or a speed slightly lower than this)
The speed is reduced to

In order to move the alignment i-ram laterally by a precisely defined amount, the crank disc 2 is attached to the second cylinder pin 25.
6 is provided. It is also possible to selectively reverse the direction of lateral movement by means of known devices.

Of course, the alignment drum 7 can be provided with multiple rows of grippers and front canisters.

In this case, it is also possible that the ranges of slow and fast circumferential speeds of the alignment drum 7 at the sheet receiving and transfer points are not located opposite to each other, that is, they are asymmetrical. In this case, the transmission is adapted accordingly.

It is advantageous if the main front cage 8 is provided with a cover cage. It is also possible to use Grino Gu6 itself as a cover gun (see, for example, Patent Application No. 2744925 of the Federal Republic of Italy). still,
A device is provided to automatically adjust the main front case 8 vertically by a predetermined distance around the outer periphery of the alignment drum 7 before final positioning of the sheet during the sheet insertion process. It's okay. Such a device is known from German Patent No. 2,613,174.

Is the main front gauge 8 in the alignment drum 7 1?
Precise adjustment is possible in the direction of the ram's outer circumference.

Of course, instead of a transmission for driving the alignment drum 7, it is also possible to use a stepping motor of the conventional type.

Instead of the suction roller 5, other types of feeding devices can be used, for example suction belts (l'') running on a suction assembly, which act on the sheets from below (Federal Republic of Italy Patent No. 231
3150), also a reciprocating suction slide acting on the sheet from below (UK Patent No. 6)
85,037) or driven clamping roller pairs (see, for example, US Pat. No. 2,984,482).

It is also possible to use a pivoting gripper (see, for example, GB 685,037) as the first sheet accelerator.

In order to influence the different slipping effects between the sheet l and the suction-loaded sheet feeding device, e.g. suction roller 5, suction belt, suction slide, at different speeds, the sheet feeding device The drive transmission has a device for adjusting the phase conditions during operation.

This makes it possible to optimally adjust the point at which the sheet hits the main front cage 8 during the paper feed operation.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an embodiment of a device for accelerating sheets according to the invention. Figure 2 is a graph of the paper feeding time, Figure 3 is a graph of the paper feeding time when each sheet arranged in a scaly pattern is shortened, and Figure 4 is a graph of the paper feeding time. 1 is a schematic side view and a front view of a transmission device for driving a drum; FIG. 1... Sheet sheet, 2... Paper feed table, 3... Auxiliary front guide, 4... Pulling guide, 5... Suction roller, 6... Grits, 7... Aligning drum, 8
・・・Main front case, 11・Delivery drum, 12・Gripper, 13・Impression cylinder, ■4・Comm cylinder, 16.17.18・Spur gear, 20・・Shiny nail, 21... Connecting rod, 22... Connecting link block, 23... Crank, 24.25... Cylinder pin, 26... Crank disc, 27.28... Guide roller, r...radius, a...interval, S...range.

Claims (1)

[Claims] 1. A method for accelerating a sheet of paper present on a paper feed table to the peripheral speed of an impression cylinder of a sheet-fed rotary printing press, comprising:
A first sheet accelerator (5) accelerates the sheet (1) to be fed into a sheet-fed rotary printing press from a resting state to a partial speed of the impression cylinder circumferential speed, and then this sheet ( 1) is transferred to the gripper (6) of a second sheet accelerator (7) and accelerated by this second sheet accelerator (7) to the impression cylinder circumferential velocity, and then this sheet (1) is ) to a cylinder (13) which rotates at the circumferential speed of the impression cylinder. 2. A method for accelerating a sheet present on a paper feed table to the peripheral speed of an impression cylinder of a sheet-fed rotary printing machine, in which sheet-fed rotary printing is performed by a first sheet-fed accelerator (5). The sheet (1) is then accelerated from a stationary state in which it is fed into the machine to a partial speed of the impression cylinder circumferential speed, and then transferred to the grits ξ (6) of the second sheet accelerator (7) and A device for accelerating a single sheet, characterized in that the sheet is accelerated to an impression cylinder circumferential speed by a sheet accelerator, and then the sheet (1) is delivered to a cylinder (13) which rotates at the full impression cylinder circumferential speed. the method of. 3. Aligning the sheets (1) with the front gear (8) of the second sheet accelerator (7), claim 2
The method described in section. 4. The sheet (1) is moved by a second sheet accelerator (7) by a predetermined degree in the longitudinal axis direction of this second sheet accelerator (7). The method described in Section 3. 5. The sheet (1) is transferred by the 10th sheet accelerator (5) to the 20th sheet accelerator (5) at a partial speed of the impression cylinder peripheral speed.
7) The method according to claim 4, wherein the method is accelerated to a speed slightly higher than the initial speed of 7). 6 A device for implementing a method of accelerating a sheet present on a paper feed table to the circumferential speed of an impression cylinder of a sheet-fed rotary printing machine, the paper feed table having a front gauge and a first The first sheet accelerator (5) is arranged so as to be drivable from a standstill to a partial speed of the impression cylinder circumferential speed in sheet cycles. and a second sheet accelerator (7) is provided, which can be driven in each case from a partial impression cylinder circumferential speed to a full impression cylinder circumferential speed. Device for accelerating sheets of paper, characterized in that: 7. Device according to claim 6, characterized in that the first sheet accelerator (5) is constructed as a bush feeder. 8. Device according to claim 6, characterized in that the bush feeding device is a suction roller (5) arranged below the sheet feeding table (2). 9 As the bush-type feeding device, the suction hole 10 is arranged below the sheet supply table (2); As the bush-type feeding device, the bushing-type feeding device is arranged below the sheet feeding table (2) and runs on the suction assembly. 10. The device as claimed in claim 9, wherein a suction belt is provided. 11. As claimed in claim 6, the pull-off feeding device is provided with cooperating driven tensioning rollers arranged above and below the sheet feeding table (2). equipment. 12. Claim 1, in which a vibrating sheet grid ξ is provided as the first sheet accelerator (5).
The device according to item 1. 13 Change the stage state of the first sheet accelerator (5) to the second
13. The device as claimed in claim 12, further comprising a device for relative adjustment to the sheet acceleration stage. 14. The second sheet accelerator (7) configured as a drum is provided with a row of grippers (6) and a row of front gauges (8). Device. 15. Device according to claim 14, characterized in that the twentieth sheet accelerator (7), which is designed as a drum, is arranged so as to be axially movable within the period of the sheet feed movement. 16. Device according to claim 15, characterized in that the first sheet accelerator (5) is arranged so as to be axially movable within the sheet feed movement cycle. 17. Claims characterized in that the first sheet accelerator (5) and the second sheet accelerator (7) are arranged so as to be movable in the axial direction within the sheet feed movement period. 17. Apparatus according to clause 16. 18. Claim 17, in which a sheet side edge position measuring device is provided instead of the drawing guide (4).
Apparatus described in section. 19. Device according to claim 18, characterized in that a side edge tensioning device is provided which acts from below on the sheet (1) whose side edges are to be aligned. 20. Device according to claim 19, characterized in that a side edge tensioning device is provided which acts from above on the sheet (1) whose side edges are to be aligned. 21 A further transmission is provided for driving a 20th sheet accelerator (7), which is configured as a aligning drum, and which operates in a range of low circumferential speeds (Vmin, ) and high circumferential speeds (Vmin, ). 21. The apparatus of claim 20, wherein the ranges Vmax, ) are arranged substantially opposite each other. 22 A further transmission is provided for driving a 20th sheet accelerator (7), which is configured as a aligning drum, and which has a range of low circumferential speeds (Vrnin, ) and high circumferential speeds (Vmax). 22. The apparatus according to claim 21, wherein the ranges , ) are arranged so that they are not substantially opposite each other. 23. A second sheet accelerator (7) configured as an alignment drum is provided with a number of rows of grits ξ (6) and a main front gauge (8). Apparatus described in section. 24. In the intermediate chamber between the suction roller (5) and the alignment drum (7) there is provided an auxiliary front gauge (3) which is controlled and acts from below.
The device according to item 3. 25 Instead of the retracting guide (4), a measuring device is provided which detects the actual position of the side edge of the sheet (1), which is placed on the auxiliary front gauge (3) in each case. (1) to the side according to the measured value of the measuring device is a device for moving the auxiliary front gauge (3
) and the impression cylinder (13) in the sheet path. 26. Claim 25, wherein the suction roller (5) is arranged to be movable according to the measured value of the measuring device.
Apparatus described in section. 27. Claim 26, wherein the alignment drum (7) is arranged movably in accordance with the measurements of the measuring device.
Apparatus described in section. 28. Device according to claim 27, characterized in that a redundant slider crank chain is provided for driving the irregularly rotating alignment drum (7). 29. Device according to claim 28, characterized in that it is provided with a circulating double slider crank chain for driving the irregularly rotating alignment drum (7). 30. Device according to claim 29, characterized in that a non-circular wheel is provided for driving the alignment drum (7) which rotates irregularly. 31. According to claim 30, the row of grippers (12) and the row of main front gauges (8) of the U-row drum (7) are arranged movably according to the measurements of the measuring device. equipment. 32. Device according to claim 31, characterized in that a main front gauge (8) is arranged on the alignment drum (7) so as to be finely adjustable in the circumferential direction of the alignment drum (7). 33, the grid-e (6) of the alignment drum (7) is
33. The device according to claim 32, comprising a device used as a cover gauge, the grit grooves (6) being arranged height-adjustably. 34. An alignment drum (7) is provided which is driven at a uniform circumferential speed that is smaller than the circumferential speed of the impression cylinder (13);
The transfer drum (seeing in the sheet feed direction) connected to the rear
11) is arranged, the sheet receiving drum (11) rotates at a circumferential speed (Vmin, ) at least equal to the circumferential speed of the alignment drum (7) during picking, At the same time, the peripheral speed of the impression cylinder (13) (Vmax,
34. A device according to any one of claims 1 to 33, configured to rotate at a circumferential speed equal to ).