DE1240096B - Device for separating and conveying the bottom sheet or cut of a stack of sheets - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B41g

German KL: X5e-8/06

Number: 1240 096

File number: K 52353 VII b / 15 e

Filing date: March 12, 1964

Open date: May 11, 1967

The invention relates to a device for separating and conveying away the bottom sheet in each case or cutting a stack of sheets resting essentially horizontally on a support The help of a suction conveyor, which describes a self-contained movement path in such a way that that it is from a starting position below and without contact with the bottom sheet in a Contact position with this lifts, whereby there is no movement in the time of attack on the bow Executes the conveying direction, then advances the bottom sheet in the conveying direction, at least up to this is captured by downstream conveyor rollers »then lowers out of contact with this sheet and returns to its original position.

Such a device is used to individually one after the other sheets or blanks from a stack deduct and this for the purpose of further processing, z. B. for printing, cutting, slitting, folding od. The like. To request a downstream processing point. The separation and conveyance takes place according to the requirements of high-speed mass production. Therefore must tilting (slanting) of the arches as well as slipping (slippage) as a result Insufficient friction between the suction conveyor and the bottom sheet because of such disturbances when separating and conveying away z. B. lead in a downstream printing device that numerous blanks are misprinted before the device is stopped and realigned can be. These disturbances must be avoided even if the blanks are not out Relatively rigid material such as cardboard, cardboard or the like, but also made of semi-rigid material, such as B. Fiber board or the like., Exist. Irregularities on the edges of the blanks to be requested, e.g. B. protruding tabs on folded box blanks are also allowed to facilitate the separation and conveying process do not bother.

From the German patent specification 1 139 513 a device for separating in one side is limited magazine stacked blanks of cardboard, cardboard or corrugated cardboard known whose each bottom blank by means of an endless belt conveyor with suction openings a slot under the front magazine wall is pulled off. The separation is done with help a stop that can be moved up and down, periodically opening the slot in the front magazine wall closes and releases again. The endless belt conveyor runs continuously with undiminished speed

Device for separating and conveying away the bottom sheet or blank of a
Stack of sheets

Applicant:

Koppers Company, Inc., Pittsburgh, Pa.

(V. St. A.)

Representative:

Dr. W. Schalk, Dipl.-Ing. P, Wirth,
Dipl.-Ing. GEM Dannenberg
and Dr. V. Schmied-Kowarzik, patent attorneys,
Frankfurt / M., Große Eschenheimer Str. 39

Named as inventor:

Warren A. Stewart, Monkton, Md. (V. St. A.)

Claimed priority:

V. St. v. America March 13, 1963 (264 826)

speed around, so that a slip (slip) between the lowermost blank and the conveyor belt is unavoidable at the time of the attack on this cut. ·

British Patent 691 065 discloses a device for separating in a stack stored, collapsed folding box blanks as well as for conveying away the respective bottom blank known. A suction head with several suction openings is provided as the conveying element, which intermittently attacks the bottom blank in the stack. The reciprocating Movement (forward and backward movement) of the suction head is carried out by means of an eccentric gear and the lifting and lowering movement of the suction head by means of a cam disk and a cooperating one Follower controlled. Another one from one is used to periodically switch the suction air on and off Cam and a follow-up link existing cam gear. In this known separating device can neither slip at the time of the attack of the suction member at the bottom Bow still avoid tilting of the conveyed sheet, because on the one hand it is not guaranteed that

709 579/151

3 4

the suction conveyor when engaging the underneath and removed sheet is excluded because most sheets do not move in the conveying direction - the suction, designed as a perforated suction belt, and on the other hand means for preventing the conveyor securely gripping the sheet.
Canting of the conveyed sheet is not possible. In the following, the invention is shown on the basis of the drawings. Only when passing through the suction, for example, is explained in more detail, namely shows the conveyor organ through its front and rear Fig. 1 in an isometric representation the dead center position of the invention leads this during a theoretically appropriate device for separating and conveying away infinitely small, but practically unusable and
No movement in conveying direction for a period of time. F i g. 2 the course of the speed of the suction

From US Pat. No. 2,828,126, from which the invention is based on the invention during separation and removal, a device is the entry of a specific blank or sheet.
According to FIG. 1, the bottom sheet or blank of a sheet singling and conveying device according to the invention has a conveyor 10 stack known consists of a plurality of single 15 essentially flat pads 13, a horizontally individual cup-shaped suction cups, the arranged rail 14 and horizontally arranged, rotatably mounted upper and lower pull rollers 16 slides mounted on a reciprocating back and forth direction - and downward movement or 17. Furthermore, the suction members are pivotable via a gear members mounted in an inner curve (partly covered by the base 13 and the following roller and covered by further intermediate panels of the device). and vacuum unit 18 with preferably two side-by-side The movement of the carriage together with the suction conveyors, in sections over their entire conveying elements, is controlled by an eccentric gearing, perforated (perforated) suction belts 89 in the width, and in a manner that the suction conveying elements are provided in different gears with which the point of attack on the in each case bottom sheet 25 driving force of a motor, not shown, to which no movement in the conveying direction from conveyor 10 is transmitted in the stack.

guide, i.e. in the state of rest on the sheet by means of the suction belts 89 of the vacuum unit 18

attack. However, it is difficult, the respective blanks or sheets, z. B. made of cardboard,

Dead center positions of the up and down movement as well as the cardboard box or similar plate-shaped! Material,

Back and forth movement is always drawn off individually from the bottom of a stack 21 in such a precise manner

to let coincide that at the time of arrival and necessarily in side-by-side succession with

gripping the suction elements on the bottom sheet at a predetermined speed by a

Stack to achieve a secure and slit-like space between the top

free coupling of the suction elements with the lowermost of the base 13 and the underside of a gate 22

Arch at least no movement of the suction members 35 passed through. The gate 22 is in a holder

takes place in the conveying direction. In particular, it is mounted in a height-adjustable manner according to length 23, which in turn is mounted on a

Gerer operating time of the known device and rail 14 is slidably mounted. Even though

Slight wear of the moving up and down only one gate 22 is shown, a larger one

The number of gates controlling the forward and backward movement can be used. The gate 22 becomes

Gear members compliance with this condition 4 ° by means of an adjusting screw 28 or the like. With respect to

no longer guaranteed. the top of the pad 13 adjusted so that

The invention is therefore based on the object of only a single blank or sheet through

to avoid the disadvantages of the known device. This will clog the

the and a slip-free coupling of the suction element feed device avoided. The suction belts 89

with the bottom sheet in the stack during the 45 push the bottom blank detected in each case

Standstill phase of the feed members also then with or sheets between the pull rollers 16 and 17, the

Ensure safety when the machine parts capture the blank and match it with the specified

and in particular the gear members after a longer conveying speed of a downstream, not

Service life are worn out. device shown, e.g. B. a printing device,

The solution according to the invention is characterized in this way.

draws that the suction conveyor as a perforated Depending on the dimensions of the to be separated Suction belt is formed, which is intermittently in and to be requested sheet, the side guides are uneiner Direction revolves, the standstill phases gene 24 along the rail 14 set so that they Over a longer, finite period of time, the front corners of the stack 21 are grasped and extended along with them. 55 means of adjusting screws 26 set in their positions.

The feed drive of the per- The gate holder 23 is preferably at the required location

forged suction belt of the suction conveyor for the purpose of being on the rail 14 by means of a clamping screw 27

Controlling the set itself over a longer period of time. The gate 22 is then placed in the holder 23

extending standstill phases with a gear by means of the adjusting screw 28 to the required

unit in operative connection, which set a cam disk 60 through-slot height, the height

and contains a follower. the opening is about the strength of one to be requested

The solution according to the invention ensures that every arc is the same.

time under almost all operating conditions. The conveyor 10 can, for. B. about one of the not

slip-free coupling of the suction element with the signed drive motor downstream belt

Most sheets in the stack, even when Ö5 mentrieb 34, 36, 37 are driven. According to

the machine parts, especially the one used, Fig. 1 is the pulley 37 at the right end

Gear and control elements, arranged after a long period of operation of the shaft carrying the pulling roller 17. At the

time worn out. Tilting of the separated left end of the tension roller 17 supporting shaft

a gearwheel 38 is arranged, which is arranged with a shaft 41 which carries the tension roller 16 Gear 39 meshes. In this way, both pull rollers 16, 17 of the one not shown Drive motor driven.

The energy for actuating the vacuum unit 18 of the conveyor 10 is transmitted via an idle gear 47 to a gear 46 which is arranged on a shaft 48 which is mounted in a bearing (not shown) in the side frame 11 and in a bearing 49 resting on a base plate 51 . A bevel gear 52 arranged at the free end of the shaft 48 meshes with a bevel gear 53 mounted on a shaft 54. The shaft 54 is rotatably mounted at 56 and 57 in the side walls of a gear box 58 and carries a cam disk 59.

In the illustrated embodiment of the invention, gear 38 and bevel gear 53 are shown in FIG designed a special relationship to each other, in such a way that the shaft 54 and consequently the cam disk 59 each perform one complete revolution in the period of time in each of which a single blank is separated from the stack 21 and conveyed away. With the Cam disk 59, a follower element 61 works together, which consists of a plurality of a hub 63 is made of follower rollers 62 mounted in bearings. Each of the follower rollers 62 is about its central axis rotatable. The hub 63 is mounted on a shaft 64.

The cam disk 59 and the follower element 61 are designed so that - when the cam disk 59 is driven at a uniform angular speed - the follower element 61 is given a non-uniform angular speed, such that each conveyor cycle has an acceleration period, a period of constant speed, a period of decreasing speed and includes a finite downtime while the cam disk 59 continues to rotate at a uniform angular velocity. This particular sequence of movements of the follower element 61 is described below in connection with FIG. 2 described in more detail.

The shaft 64 is mounted in the side frame 11 and in a bracket 66 which is fastened to the end wall of the gear box 58. A gearwheel 67 is arranged on the shaft 64 and is always driven by the shaft when the follower element 61 is rotated by the cam disk 59. The gear 67 drives a gear 68 which is arranged at the end of a shaft 69 rotatably mounted in the side frames 11 and 12. Two rollers 71 are arranged on the shaft 69 at a lateral distance from one another. These rollers are preferably grooved in the longitudinal direction or provided with strips or ribs running in the longitudinal direction, and one roller 71 is a drive roller for each perforated suction belt 89, which is correspondingly grooved in the drive roller 71 in the transverse direction or provided with strips or ribs is provided.

The vacuum unit 18 consists essentially of a vacuum housing (not shown in more detail), which is arranged below the base 13. This vacuum housing has side plates 73 which are parallel to one another and which are pivotably mounted at one end on the shaft 69, so that the entire vacuum unit can be pivoted about the shaft 69. All individual parts of the vacuum device with the exception of the rollers 71 are carried by the vacuum housing. Parallel to the shaft 69 is a shaft 74 which is mounted at each of its ends in the side plates 73 and on which two rollers 76 are fixedly arranged at a distance from one another, which are similar to the rollers 71 and are aligned with them.

Below each of the rollers 76, a third, not shown, similar roller is arranged for each suction belt, which serves as a pulley and whose position can be adjusted to adjust the tension of the belt 89.

Each of the two perforated suction belts 89 preferably has two perforated and two unperforated Band areas, with all four band areas being the same length and with one perforated band area in each case lies between two non-perforated tape areas.

In the vacuum housing, a suction trough 96 is provided for each of the suction belts 89, which can be evacuated by means of an uninterrupted vacuum pump. Shortly before and during the retraction of a perforated belt area of the two synchronously running suction belts 89, the vacuum unit 18, which is pivotable about the shaft 69 , is moved from a starting position, in which the wheels are out of engagement with the bottom sheet in the stack, by means of control means (not shown) Raised position in which the tapes attack the stack. In its raised position, the vacuum unit is located at its outer end slightly above the surface of the base 13. Since each of the suction belts 89 is provided with two perforated and two unperforated belt areas, the two synchronously running suction belts of the vacuum unit open twice during each complete belt revolution pivoted from, that is, the belts are raised synchronously twice in the attack position on the bottom sheet and lowered from this position back into the starting position, so that with each complete belt revolution two sheets can be separated and conveyed away one after the other. The separation and conveying process can best be described in connection with the graphic representation in FIG. 2, in which the non-uniform course of the speed of the suction belt 89 is shown as a curve during one revolution of the cam disk 59. In addition, the downward and upward movements (the lifting and lowering periods) of the vacuum unit 18 are recorded above the speed curve. For reasons of drawing, the proportions of the conveyor 10 are brought into a certain proportion to the proportions of the processing device downstream of the conveyor 10, for example a printing drum (not shown). A typical print drum is 1270.6 mm (50.023 inches) in circumference and rotates at a circumferential speed of 465.86 cm / sec (183.416 inches / sec). In order to ensure that the print on the separated and conveyed blank is in register, it is known that this must be fed to the printing drum in a time-coordinated relationship with the circumferential speed of the printing drum, namely in the example at a speed of 465.86 cm / sec.

The circumference of the printing drum determines the length of the blanks that can be processed

Claims (1)

7 8 (Standard or regular length). In the aforementioned case approximately 3.2 mm above the surface of the base 13 play, the printing drum has to be swiveled approximately upwards so that the blank 1270 mm (50 inches), so that the theoretical additional stack 21 is raised a little and between cutting length is also 1270 mm, provided that this is the surface of the strips 89 and the lowest Blanks at a speed of 465.86 cm / 5 blanks in the stack 21 the best possible friction sec run and the leading edge of a conveyed contact is achieved. The blank immediately follows the rear edge of the blank that was conveyed away at the moment in which the belts 89 still follow. As it stands, each of them has moved a distance of displacement between the belts 89 and 1016 mm (40 inches). Since the tapes of the cut to be separated and requested are carried out during the slowdown period at a point in time at which the cut no longer touch the still side of the stack 21, the cut has to slip without slipping (without delay speed, unimportant, accordingly slip ) from the speed 0 in the stack 21 draw the two dashed curves in the required specified speed (target Fig. 6 that area within which the acceptance speed) of 465.86 cm / sec accelerated 15 table delays can be,
will. As soon as the blank is displaced 1143 mm (45 inches) from speed 0 to its original position in 0.0272 seconds, the required speed of 465.86 cm / sec has raised the vacuum unit 18 to its original position be accelerated. Reached 89 during this 0.0272 second position with the belts stationary. If the average speed of the 20 denier cuts with a standard length of the cut is 232.91 cm / sec (V2inal 183.416 inches / sec), 1206.5 mm (47.5 inches), then the distance actually covered ( actual displacement) is 63.5 mm (2.5 inches). The leading edge of the blank that was transported immediately before remains effective and captures the last 63.5 mm (2.5 inches) accordingly. Cut after 0.0272 seconds 63.5 mm (2.5 inches) 25 However, this has no adverse effect, because compared to the theoretically calculated displacement this cut is back at this point in time with the previous of 127 mm (5 inches), so that the Maximum given feed speed (target speed-blank length, which is based on the example) moved and not only isolated from the pull rollers 16, 17, lying arrangement and can be conveyed to the downstream but also from at least one switched printing drum, not shown, 30 set of rollers in the downstream device is 1206.5 mm (47.5 inches), ie the theoretical is compulsory. Length of 1270 mm minus the displacement distance. The suction belts 89 therefore constantly run into and of 63.5 mm that the blank has to travel in the same direction, and the friction clutch until it reaches the specified or setpoint speed between the belt and the bottom blank in the stack is accelerated. 35 happens in the state of rest of the band and the After the cut to the first 63.5 mm cut. Furthermore, according to the invention, the vacuum acts on the target speed of 465.86 cm / sec without interruption, so that no mechanical acceleration has occurred - and (17.5 inches) held constant. Because the perforated 40 would have to be turned off, are required. Due to the sections of the belts 89 508 mm (20 inch) long coupling in the state of rest, slippage is avoided and, at the end of the displacement path, tilting of the 508 mm of the cut to be separated and requested is avoided. Any inertial forces constantly moving back and forth between two perforated sections of each belt 89 through the associated vacuum cup 96 do not have to be absorbed,
The invention is not limited to the aforementioned execution belts 89 are now located above the vacuum shape of the cam disk 59 and shell 96, ie in a position between the upper part of the follower element 61 ; Rather, either side of the vacuum tray and the underside of the borrowed device can be used with a stack so that the vacuum in the trays 96 does not work with a uniformly rotating drive, but with a coupling of the belt to the lowermost arc in the non-uniformly rotating output. Stack can cause. For example, a Whitworth gearbox can be used At this point in the operating cycle, the pressure will be reduced to the extent that the vacuum unit 18 according to the invention is gradually reduced so that the device creates speed-character contact between the belts 89 and the supply. Depending on the cut stack 21 from the conveyor 10 and no section of the switched processing device, different lengths of the belts 89 can be used beyond the base 13, protruding upwards. During this reduction period of the duty cycle, the belts are 89 of claims:
the cam disk 59 and the follower element 61 sell € 0 slowly and are at the end of their lowering movement 1. Device for separating and requesting almost silent. As soon as the vacuum unit has started again, the bottom sheet or blank in each case has to rise into their attack position, the bands of a stack are essentially horizontal the 89 come to a complete standstill and stand with the help of a resting arch with the help of a pad during the upward pivoting of the vacuum unit 65 suction conveyor organ, which is a self-contained 18 still until it describes the level of the upper side of the trajectory in such a way that Reached document 13. If desired, it can arise from a starting position below the the vacuum unit 18 at its outer end around and without contact with the lowermost sheet in a contact position with this lifts, whereby there is none at the time of the attack on the bow Moves in the conveying direction, then advances the bottom sheet in the conveying direction, at least until this is captured by downstream conveyor rollers, then except Contact with this bow lowers and returns to its original position, thereby characterized in that the suction conveyor (18) is designed as a perforated suction belt (89) is, which rotates intermittently in one direction, whereby the standstill phases extend over extend over a longer finite period of time. 10 2. Apparatus according to claim 1, characterized in that the feed drive of the perforated Suction belt (89) of the suction conveyor (18) for the purpose of controlling the over a longer period of time Period of standstill phases with a gear unit in operative connection stands, which contains a cam (59) with a follower member (61). Considered publications:
German Patent No. 1139 513;
British Patent No. 691065;
U.S. Patent No. 2,828,126. 1 sheet of drawings 709 579/151 5.67 © Bundesdruckerei Berlin