FI111004B - Device for controlling the stacking position of the leading edge of the stacking device for thin sheets - Google Patents

Description

111004

Front edge stacker adjuster for thin sheet stacker.

This invention relates to a device for adjusting the position of the leading edge in a stack in a stacker of thin sheet material 5.

Taking, for example, conventional stack-type stacking apparatus for sheet-like objects, one type is known which is very simple in construction and which provides a reasonable stacking efficiency. Therein, 10-plate-like objects are successively guided to the stacker body by various conveyors, such as a plunger, suction conveyor, or the like, after which they are dropped by force or allowed to drop obliquely and stacked; for adjusting the stack positions of the front edges of stacked board-like objects to a substantially coincident position.

However, sheet-like material may immediately rest on a fixed guide provided that rigid sheet-like objects, such as plywood or plastic sheets, are fed into the stacker at low speed. If some rigid board-like objects or the like were introduced into the stacker at higher speeds, or if weak board materials were introduced into the stacker (such as transporting plywood perpendicular to their fiber direction), serious injury, such as middle part fracture. Similarly, weak sheet-like objects are difficult to stack in the above system. · Using.

* 30 In addition, there is another known system in which, instead of a fixed guide of the above system, a movable member is held by a resilient member such as a spring so that it moves flexibly so that it can buffer and receive a disk-like object hit by the movable guide. the stroke as the spring stretches and collapses, and once the plate-like object has been dropped into position downstream of the predetermined stacking position, the plate-like object moves again against the inlet direction of the plate-like object due to the force exerted by the aforementioned resilient member to adjust the stack positions, which thus remain substantially uniform. This improved system is excellent because it has a very fast response, and because it reduces the possibility of serious problems due to the tilt of objects such as plate 10 during transport, so that this system is relatively effective compared to the above embodiment.

However, in order to move once dropped plate-like objects in the opposite direction of the feed of the above-mentioned object, the plate-like objects must be allowed to slide gently on top of each other. However, if sheet-like objects are weak thin sheet material, sufficient force cannot be transmitted from their leading edge to their rear end, causing the problem that the front or center portion 20 of the re-transferable thin sheet material breaks. Thus, even in an improved system, it is difficult to stack sheet materials. As a result, either the transport of sheet material must be stopped whenever the sheet material for stacking is dropped vertically, which reduces the efficiency of stacking, or the sheets are randomly stacked without regard to their position. However, this too does not make sense.

25

It is an object of the present invention to improve the above-mentioned conventional apparatus so that thin sheet materials can be effectively stacked, even when relatively weak, while maintaining substantially the leading position of the leading edge of the thin sheet material. The device of the present invention for adjusting the leading position of the leading edges of thin sheet materials fed to the stacker of thin sheet material at high speed and dropped and stacked on top of each other is characterized by the features set forth in the characterizing part of claim 1.

The present invention will become more apparent with reference to the description which is made with reference to the accompanying drawings, in which: Figure 1 is an explanatory diagram illustrating a stacking device having a control device according to the present invention; Figure 2 is an explanatory diagram illustrating the stacking apparatus shown in Figure 1; Figure 3 is an explanatory enlarged perspective view illustrating a portion of the stacking device shown in Figures 1 and 2; Figure 4 is a partially enlarged cross-sectional view taken along line A-A in Figure 1; Figure 5 is an enlarged plan view of the guides and thin sheet material with the thin sheet material in the position 20 shown in broken lines in Figure 2; and Figure 6 is a plan view upstream showing the essential parts when the thin sheet material is in the position shown in broken lines in Figure 2.

25

Referring to the drawings, a front edge stacker adjusting device in a thin sheet material stacker is described. It should be noted that the control system for controlling the operation of the apparatus comprising the stacker does not constitute any particular structure, but is quite ordinary, and therefore, for convenience, the control system is not shown in the drawings.

«4 111004

Figure 1 is an explanatory diagram of a plywood stacking device according to the present invention. Figure 2 is an explanatory schematic side view of the stacker of Figure 1. Figure 3 is an enlarged perspective view explaining the stacking device shown in Figures 1 and 2. Figure 4 is a partially enlarged sectional view taken along line A-A in Figure 1. Figure 5 is an enlarged plan view of the guides and thin sheet material with the thin sheet material in the position shown in dashed lines in Figure 2. Fig. 6 is a plan view from the upstream side illustrating the essential parts when the thin sheet material is in the position shown in broken lines in Fig. 2.

10

In the drawings, reference numeral 1 denotes a plunger conveying a rectangular plywood P in a direction perpendicular to its fiber direction, comprising a pleat strap la located near each side edge of the plywood P and provided with a set of prongs lf, a plurality of straps Ib located 15 equipped with a set of spikes lf, wheels le, drive shafts Id, belt guides la to hold the belts la fixed when forces are applied to the belts, etc. The spike conveyor 1 is operated at high speed by an actuator (not shown) such as a motor or the like -20 corresponds to an impact position upstream of the stacking station, where the pins lf pierce the top of the plywood, to a predetermined position where the held plywood P is removed.

Reference numeral 2 denotes an impact release mechanism that strikes and releases the plywood P obliquely downwards, and comprises impact release levers 2a corresponding to impact straps la near each side edge of plywood P, impact release levers 2b corresponding to impact straps Ib located near the centerline of the plywood P , junction levers 2c, pivot levers 2d, drive shafts 2e, etc. Based on the trigger signal from the predetermined position of the plywood P obtained by the plunger P from the predetermined position of the plywood detector (not shown) or from the impact encoder (not shown). the mechanism 2 is intermittently operated by a drive source (not * 5111004), such as a servo motor, clutch and brake motor, or the like, and releases the sheet material P by force and drops it downwardly as the plywood P reaches a predetermined position.

As clearly shown in Figures 2 and 6, the lower point of the downward movement of the impact release levers 2a corresponding to the impact straps la corresponding to each side edge of the plywood P with the different lengths of the respective connecting levers 2c is set lower than the middle stroke of the ply P Ib the lowest point of the downward movement of the respective impact release levers 10 2b.

Reference numeral 3 is a damping guide having guide plates 3a, support plates 3b, slide bar 3c, slide guides 3d, and the like, and is slidably mounted on sliding surfaces 5a of slide bars 5 as described below. Normally, the damping guide 15 3 is in the standby position M downstream of the plate material P on its downward path. The standby station M is located upstream of the predetermined downstream stacking station N, as shown by the solid line. The damping guide 3 retracts backward downward, as shown by the colon, as the hit plywood P moves obliquely down-20 and is returned to the standby M by the reset mechanism described below, at least when the plywood P falls below the damping guide 3.

Reference numeral 4 denotes a fixed guide having adjusting plates 4a, a fixed beam 4b attached to the stacking apparatus body (not shown), and other members. The adjusting plates 4a are secured to the fixed beam 4b so that they are located on the downward path of the downstream end of the plywood P leaning against the guide plates 3a, so that the plate can always be placed in a predetermined stacking position N.

30

Reference numeral 5 denotes a slider which also acts as a slider 5a, a guide wall 5b, a sliding wall 5c, and other portions attached to the stacker body (not shown) or the like so that the slider surface 5a stays level, or stays essentially the same. Also, the slider which responds 5 supports the sliding damping guide 3 and adjusts its smooth return movement to the stand-by position M.

5

Reference numeral 6 denotes a reset mechanism comprising an air cylinder, etc. The reset mechanism returns the damping guide 3 to the standby position M on the basis of a delay signal or the like which produces a delay stroke release mechanism 2 on the start signal whenever plywood P10 falls below the damping guide 3.

Reference numeral 7 denotes a stackable stacking table that receives successively falling plywoods P, guided by a controller (not shown) or the like, always at a substantially stationary level on the basis of a trigger signal from the level detector (not shown) indicating the top surface level the top surface of the sheet) when stacking is initiated, and which indicates the level Pa of the top surface of the stack of plywood stacked on the stack base 7 when stacking has begun.

Reference numeral 8 denotes a fixed guide having baffles 8a, a fixed beam 8b, and the like. Exceptionally, when the fixed guide 4 is stuck obliquely to the forward plywood P and when the plywood is stacked in an adhesive space, I · the trailing stacked plywood P is plywood P instead of the fixed guide 4 and jumps upstream due to the flexibility of the previous plywood P. In such a case, the fixed guide 8 contacts the upstream edge of the trailing plywood P, preventing the plywood P from deviating to a large extent. The stationary guide 8 is secured to the stacking device frames (not shown) or the like so that it is on the opposite side of the stationary guide 4 at a sufficient distance from the length 30 of the plywood P in the transport direction.

7 111004

As clearly shown in Figure 5, the central portion of the damping guide 3 also extends somewhat toward the transport direction of the plywood P.

The stacker according to the present invention has, for example, the structure of 5 as described above, and the shock release mechanism 2 strikes and drops the plywood P. pierced by the peaks lf and transported by the prong conveyor a to the predetermined position. Since plywood P has kinetic energy (moment of inertia) 2 from the position shown by a solid line obliquely downwards, as indicated by a double dashed line at P '.

10 In this case, as shown in Figure 6 (the plywood P 'is shown by a solid line in Figure 6), viewed from above upstream of the base of the apparatus, when the sheet material is at F shown by the double dashed line in Figure 2, the plywood P' 2a and 2b, and the plywood drops upward in a convexly curved state because, in its lowest position, the impact release levers 2a are different in size from the impact release levers 2b, as mentioned above. As a result, the geometric moment of inertia of the plywood P increases and results in a state in which the strength is substantially increased both in the fiber direction and in the direction perpendicular thereto. Similarly, the downstream edge of the plywood P rests on the baffle plates 3a of the damping guide 3, which are in reserve position M. Consequently, this hit reduces phenomena such as damage to the edge portion of the plywood P or fracture of its central portion. Similarly, increasing the transport speed does not cause any problems resulting in a better benefit-to-stack ratio of the stacking process.

On the other hand, when the plywood P contacts the guide plate 3a, the damping guide 3 pulls

,. - stays backward as shown by the colon, as does plywood P

applies some of its kinetic energy to the damping guide 3> 30 and drops further obliquely in the deceleration state. The plywood P then stops as it hits the adjusting plate 4a of the fixed guide 4 and rests on the holding tray 7 or stack of thin boards Pa so that the edge holding position of the edge is adjusted. Whenever the plywood P falls below the damping guide 3, the resetting mechanism 6 also returns the damping guide 3 to the standby position M (at least when the next plywood P is struck and dropped).

5

Similar steps are repeated to stack the plywood on top of each other. In the design of the adjusting device of the present invention, the plywood applies a portion of its kinetic energy to the damping guide, which first hits the plate, then, when retarded, hits the fixed guide. Although the plywood 10 is slightly weak, this makes the damage less likely to occur than in the normal case where the plywood hits the fixed guide from the beginning. Thus, plywood can be fed at a relatively high speed from the outset, resulting in more efficient stacking.

As can be clearly seen in Figure 5, the center of the damping guide 3 is slightly outwardly upstream, facing the transport direction of the plywood P. Although the plywood P is slightly oblique to its conveying direction, as shown by the dashed line, this results in a reasonably wide portion extending from the right edge near the centerline to its leading edge (the portion corresponding to the two right guide plates 3a in this embodiment). As a result, the force exerted on the plywood P at the time of impact, as compared to the case where the baffles 3a are arranged on a straight line perpendicular to the transport direction of the plywood P, now results in no plywood P or equivalent damage problem. In addition, since the plywood P will eventually rest on the fixed guide, and as the plywood bevel is therefore corrected, the stack shape will not deteriorate. It is needless to mention that unless the plywood p is inclined with its conveying direction shown by a solid line, the substantially wide portion near its centerline rests substantially on the guide plates 3a so that the force exerted by the plywood P is distributed. Therefore, stacking can be done efficiently without any problems.

* 9 111004

Since, in the stacking apparatus according to the invention, the plywood P is also raised upwardly in a convex curved space by the impact release mechanism 2, the plywood is, if necessary, relatively clearly curved. However, too strong a curve could interfere with the rest of the plywood (stacking position) and should therefore be avoided. It is desirable that the preferred degree of curvature 4 be selected from experiments.

In the above embodiment, a damping guide 3 is used, which is a single row in the transport direction of the plywood P. However, a multi-row damping guide could be used, in which the damping guide is divided in the direction in which the damping guides are usually suitably damped, into a plurality of damping sub-guides that are located in the respective standby position. In addition to the above embodiment, where the kinetic energy exerted by the plywood P is certain to be damped by the frictional force acting on the sliding guides M through the sliding surfaces, it may be possible to use a form where the sliding guides M are easily slidably supported by directly acting bearings or the like. the slide guides M retract back substantially free of friction at least immediately after the thin sheet material has hit them. In other words, it is advantageous if the damping guide advantageously touches the edge of the thin sheet material and retracts to make room for the fixed guide. The structure may be suitably modified without disregarding the implementation of the above embodiment. In any case, soft coaching is not expected if the damping guide 3 is too heavy or too light. Therefore, it is desirable that the weight be selected on the basis of full-scale experiments. When the mass of the sheet material changes from periodic to desirable, it is desirable to use adjusting means, - to adjust by removing or leaning the weight-reducing guide 3.

30

With regard to the implementation of the fixed guide, it is sufficient that the fixed guide and the damping guide change position and touch the edge of the thin sheet material, thereby adjusting the stacking position of the edge of the thin sheet material. The structure may be suitably modified without adhering to the implementation of the above embodiment. However, it is also desirable that, based on the experiments, the distance from the stacking station where the fixed guide is located to the standby position where the attenuating guide is located is selected.

Further, the implementation of the stacking device body need not be limited to the implementation of the above embodiment. In other words, various known shapes may be applied if the thin sheet materials fed to a predetermined position by various conveyors 10 or the like are dropped and stacked.

In the aforementioned embodiment, a pivot-path is-imaging mechanism is used, and the length of the linkage levers is different at appropriate positions so that the downward movement of the impact-release levers is at the desired positions. However, even when all the linkage levers are of equal length and the same type of impact release mechanism is used, it is possible to distinguish the lowest positions of the downward movement of the impact release levers as in the above embodiment, for example by changing the mounting plane 2e. Similarly, it is possible to perform similar excitations using a shock release mechanism of a different type, such as a vertical path type. It is essential that the lowest point of the downward movement of the impact release levers of the tine belts near each side edge of the sheet material is tuned lower than the lowest point of the downward movement of the stroke release levers of the tine straps near the centerline of the sheet material. There are no particular restrictions on the type of actual shock release mechanism.

By the above arrangement, in which the thin sheet material exerts a portion of its energy-absorbing guide against which it strikes, so that when retarded hits the fixed guide, the above-mentioned damage problem can hardly occur even if the sheet is somewhat ja 111004 or sheet materials can be fed unimpeded at relatively high speeds, whereby they can be stacked efficiently.

Furthermore, even if the thin sheet material is slightly tilted with respect to its conveying direction 5, at least one portion of the thin sheet material extending from the leading edge to its central portion contacts the damping guide substantially uniformly and accordingly distributes load so as to reduce the likelihood of serious problems which occurs in conventional devices, and in addition, the skewed position of the thin sheet material 10 can be compensated so that there is no deterioration of the sheet material stack. It is needless to mention that for sheet material which is unevenly inclined with respect to the conveying direction, only the central portion of its centerpiece hits the damping guide substantially uniformly to distribute the load, and it is also possible for thin sheet material 15 to be stacked.

As clearly understood from the foregoing, using the adjusting device of the present invention, sheet materials which are somewhat weak can be effectively stacked and their leading edge stacking position can be adjusted substantially flat, allowing the leading edge stacked position to be adjusted reasonably and evenly slightly inclined with respect to the transport direction, and accordingly, the applicability of the existing process is excellent, and the technical effects and benefits of the sheet material stacking process can be significant.

»Λ t

Claims (4)

Device by which a stacking device for thin sheet material of high speed fed and stacked and stacked thin sheet material's leading edge is regulated, characterized in that it comprises: - a retractable damping guide (3), which normally is in a readiness position p on the upper web side of a pi predetermined pile position abutting against the leading edge of the thin sheet material (P) to receive the force from the feed direction of the thin sheet material (P) always fed di to the stacking device thin sheet material (P) is filled obliquely, after which it is withdrawn: - a fixed guide (4) arranged in a predetermined stacking position 15 for the leading edge abutting the front edge of the thin sheet material (P) in the position of the damping guide (3) retractable; and - an iteration mechanism (6) by which the damping guide (3) is iterated to the standby position always, i.e. the thin sheet material (P) falls down below said damping guide (3). 20 Apparatus according to claim 1, wherein the stacking position of the thin edges of the front material (P) is controlled, characterized in that the middle part of said damping guide (3) extends slightly towards the feeding direction of the thin sheet material (P). 25 Device according to claim 1, wherein the stacking position of the front edges of thin sheet material (P), characterized in that it comprises: - a stroke-release mechanism (2), the stroke-release levers (2a) cutting above it in the thin the sheet material (P) and release it; 30. wherein the impact release levers (2a) disposed adjacent the sides of the thin disk material (P) are adjusted lower than the stroke release levers (2a) near the center of the thin disk material (P), said thin disk material. (P) falls down and hits said retractable damping guide (3) in an upwardly bending bent state. 5 4. A device by which a stacking device for high-speed thin sheet material is fed and stacked and stacked thin sheet material facing the lower edge of the stacking web is controlled, characterized in that it comprises: 10. a retractable sliding guided damping control ( 3), which is normally in readiness of the drop path to the edge facing the lower side of the thin material (P), and which is adapted to hit said edge facing the lower path to receive a force from the thin sheet material (P) of said ) feed direction and thus to retract; 15. a fixed guide (4) arranged on the drop path during contact with said damping guide (3); and - a return mechanism (6) by which the damping guide (3) is always fed to the standby position, where the thin sheet material (P) is lowered below said damping guide (3). 20 c i 4 4