JPH0573660B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention provides a method for manufacturing a plurality of flat workpieces, preferably glued paper bags, in an overlapping relationship.
The device comprises a rotating drum for receiving a supplied workpiece, the rotating drum having a suction nozzle for holding the workpiece, and transferring the workpiece to a slower double belt Introduced in overlapping relation to the entrance nip of the conveyor.

[Conventional technology]

In a device of this kind, known from DE 31 39 290 A1, the rotating drum consists of a feed roller of a so-called rotary applicator, which roller is equipped with a suction device and is driven by a gear as in a planetary gear system. It's driven by. A suction device picks up individual workpieces from the stack and feeds the workpieces into the inlet nip of a downstream double belt conveyor at intervals corresponding to the desired overlap length. This known device is not only capable of separating stacked workpieces and transporting the workpieces in an overlapping state; Although not precisely aligned with respect to the conveyors and each other, they are relatively expensive. However, there are applications where overlapping workpieces must be fed to downstream equipment in precise locations and with equal length overlap; The conveying device includes equally spaced gripping devices or suction devices that engage at their non-overlapping leading edges.

[Problem that the invention seeks to solve]

It is therefore an object of the present invention to provide a simplified method of the kind described above, which is capable of converting workpieces fed one after the other into precisely aligned overlapping configurations with uniform overlapping lengths. The objective is to provide a device that

[Means and effects for solving problems]

According to the invention, the above object is achieved by a drum, consisting of only one cylinder, rotating at a circumferential speed corresponding to the feed speed of the conveyor, which feeds the workpieces one after the other independently, holding the article at its leading edge. A gripper is provided and a suction nozzle spaced from the gripper and covered by the article is provided in the area of the entrance nip of the double belt conveyor for receiving the article when the leading edge of the article is released. A guide plate or rod for lifting from the drum and a drive control wheel with at least one notch extending in the chordwise direction are provided, the rear end of the wheel comprising:
a generally radial edge forming an abutment, the abutment constituting a step for the leading edge of the article, and a circumferential portion of said wheel rotating at the same speed as said double belt conveyor; and pushing the articles towards the redirection drums of the double belt conveyor. In the device of the invention, after the gripper releases the workpiece, the leading edge abuts the abutment of the control wheel and the suction nozzle such that the leading edge abuts flush against the abutment. The work piece is thus fed by the drum which holds it relatively weakly. By means of the arcuate circumferential portion of the control wheel,
After the work piece is aligned with the abutting part,
It is pressed against a deflection drum in the inlet area of the double belt conveyor, whereby the workpieces are transferred to the double belt conveyor in a precise position. After the leading edge of each workpiece is introduced into the double belt conveyor, the double belt conveyor pulls along the trailing edge. The control is such that the abutment is placed in the path of each new workpiece as it arrives and rotates only after the workpiece has been aligned and simultaneously pressed against the deflection drum. The wheel drive drives the control wheel synchronously with the double belt conveyor. Therefore, after the individually fed workpieces have been aligned, they are placed in position by means of a control wheel that presses against the double belt conveyor, so that each workpiece is precisely aligned. at the inlet nip of the double belt conveyor.

The control wheel may have multiple abutments, preferably two abutments offset by 180 degrees.

The device according to the invention described above can be combined with particular advantage with a stacking device for flat workpieces, the stacking device having a stacking cylinder device with a suction nozzle, which stacking device After the tip of the piece is suctioned and the workpiece is captured around its periphery, the workpiece is deposited in a substantially upright position on a stacking platform attached to the stacking cylinder. Such a stacking device is known, for example, from German Patent No. 644007. If the newly glued workpieces are stacked immediately after gluing, the stacked workpieces may undesirably stick together. However, if the workpieces are converted to a partially overlapping configuration before stacking and the feeding to the stacking station is suitably slow, the material will harden and the problem of pecking in stacking will be avoided. On the other hand, it is unavoidable that overlapping articles may stick to each other. In order to release any sticking in the overlapping articles before stacking, the circumferential spacing of the suction nozzles is preferably made to correspond to the overlapping length of the workpieces. By means of the stacking cylinder, overlapping workpieces are suctioned by suction nozzles at their non-overlapping tips, fed one after another, and finally deposited on a stacking table.
Thus, in the unlikely event that any overlapping articles were adhered to each other, such adhesion would be such that during stacking, subsequent workpieces fed to the last workpiece placed on the stacking table It is released by being advanced by the overlap length, thereby releasing any pecking.

German Patent No. 1005819 describes a stacking cylinder partially surrounded by an endless strip, in which the overlapping workpieces conveyed on the stacking cylinder are likewise deposited on a stacking table to which the stacking cylinder is attached. . However, since the individual workpieces have already been separated above the stack by the surrounding pressure band, the workpieces fall onto the stacking table under the force of gravity;
The stuck condition is not relieved by the necessary displacement of the workpieces relative to each other by the stacking cylinder during stacking.

Further advantageous advantages and features of the invention are described in the claims.

〔Example〕

An embodiment of the present invention will be described in detail below based on the drawings.

As shown in FIG. 1, the workpieces are fed individually by a double belt conveyor 1 via guide plates 2 to a gripper drum 3. Gritspadrum 3 is
It is supported so as to be driven within the frame 4, and includes a plurality of parallel circumferential grooves 5. The glued paper bag is fed by a guide 2, the tip of the paper bag engages a mechanical gripper 6 and a control device (not shown)
A gripper 6 equipped with a gripper 6 captures the paper bag. The gripper 6 cooperates with the suction gripper 7. On the side opposite the supply belt, the gripper drum 3 adjoins a pressure zone 8 for stacked articles, into which the individual bags are transferred. For this purpose, a deflection plate 9 engages in the circumferential groove 5 of the gripper drum 3, the deflection plate 9 arriving after the corresponding mechanical gripper 6 has opened in a known manner by means of a cam. The tip of each bag is deflected between the inlets of the pressure zone 8. a suction device 7a associated with and downstream of the gripper 6a so that the bag can still be properly fed even if the mechanical gripper 6a opens;
A vacuum is applied to the bag 10, so that the bag 10 is
, i.e. first onto a guide segment 11 having two abutments 12 . The guide segment 11 is driven continuously in two revolutions for each revolution of the gripper drum 3 with four grippers 6. Bag 10 arrives,
First, it abuts against the abutting portion 12' of the guide segment 11,
Then, by continuous rotation of the guide segment 11, the overlapping article is introduced into the inlet nip 13 of the pressure zone 8. The pressure band 8 is driven at a lower speed than the gripper drum 3 so that the articles overlap. The circumferential speed of the arcuate portion of the guide segment 11 forming the control wheel corresponds to the speed of the pressure band 8 for overlapping articles. By using a guide segment 11 with two abutments 12, 12', a very precisely defined degree of overlap is therefore obtained.

Since this precisely defined degree of overlap is required, the flow leaving the pressure zone 8 may transfer the suction devices 15 onto a suction drum 14 provided on its outer periphery with a spacing that corresponds to the degree of overlap. These suction tools 15
engages the tip of each arriving bag and draws the bag into the package forming device 16. This device 16
has a depositing table attached to the suction drum 14, the depositing table being of a construction equipped with a holding and ejecting device as described in detail in DE-A-2928682, and further described in this specification. Further explanation will be omitted.

The guide segment 11 is mounted so as to be driven by an arm 17 which pivots about a pivot 18 . Therefore, the arm 17 is connected to the tension lever 1
It is connected to 9. This tensioning lever 19 has an adjusting screw 21 which rests against an abutment 22 by means of a tension coil spring 20 . By adjusting the screw 21, it is therefore possible to determine the degree of pressure of the guide segment 11 on the upper inlet roller 23 of the pressure band 8. This facilitates the introduction of each bag 10 into the pressure zone 8. This pressure band comprises two parallel and identically constructed side parts 24 interconnected by a cross member 25. Between the side parts 24 there are rollers for driving, deflecting and pressing the pressure band 8, which rollers are surrounded in a known manner by two endless belts. The piston-cylinder unit 26 allows the entire pressure zone 8 to rotate around the rear deflection roller 27 of the lower conveyor belt, and
The upper conveyor belt has a suction drum 14.
It extends to such a length that it partially wraps around the . The rear deflection roller of the upper conveyor belt on the discharge side is designated with the reference numeral 28.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of equipment for converting workpieces into an overlapping configuration. FIG. 2 is a side view of a stacking device connected to the device of FIG. 1 by a double belt conveyor. 1...Double belt conveyor, 2...Guidance board, 3
...Gripper drum, 4...Frame, 5...Peripheral groove, 6...Gripper, 7...Suction gripper, 8...
...Pressure band, 9... Deflection plate, 7a... Adsorption tool, 10
...Paper bag, 11 ...Guidance segment, 12,1
2'...Abutment part, 13...Inlet nip, 14...
Suction drum, 15...Adsorption device, 16...Package forming device, 17...Arm, 18...Pivot, 1
9... tension lever, 20... tension spring, 21...
Adjustment screw, 22... Contact portion, 23... Entrance roller, 27, 28... Direction changing roller.

Claims (1)

Claims: 1. Apparatus for converting flat workpieces, preferably glued paper bags, into overlapping relationship, comprising a suction nozzle for receiving a fed workpiece and holding the workpiece, the apparatus comprising: In an apparatus comprising rotating drums for introducing said workpieces in partially overlapping relation into the inlet nip of a double belt conveyor, the conveyor 1 having one cylinder and supplying the workpieces singly and sequentially; A drum 3 rotating at a circumferential speed corresponding to the feed speed is provided with a gripper 6 for holding an article at the tip of the article, and at a distance from the gripper is a suction nozzle covered by the article. 7a, in the region of the inlet nip of the double belt conveyor 8, a guide plate 9 or guide rod is provided which lifts the article from said drum 3 when the leading end of the article is released, and which extends in the chordal direction. A drive control wheel with at least one notch is provided, the wheel having a substantially radially extending edge forming an abutment 12, 12', the abutment being at the leading end of the article. forming a step for the section, characterized in that said wheel comprises a circumferential part that rotates at the same speed as the double belt conveyor 8 and pushes the articles onto the redirection drum 23 of the double belt conveyor 8. A device that converts flat workpieces into overlapping relationships.