JPH0223460B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for forming rolls of strips of flat flexible articles stacked in scales, such as bags stacked on a conveyor belt. ,
The apparatus includes at least one take-up hub rotatably mounted on a machine frame and one end of the take-up hub for holding a strip of stacked articles on a supply roll to be formed on the hub. a supply shaft located in a fixed position relative to the floor on which the machine frame is installed, supplying at least one retaining strip fixed to the machine frame with a pin passing through a pulley rotatably mounted at one end; A conveyor frame rotatably attached, an endless conveyor belt hooked around a set of pulleys rotatably attached to the conveyor frame,
a drive pulley operatively connected to a drive motor for driving the conveyor belt, and means for moving the conveyor frame to engage the conveyor belt with a take-up hub or supply roll to stack the articles in a scaled manner. The invention includes a belt conveyor for feeding the holding strip together with the holding strip to a winding hub, and a feeding device for feeding the strip of scaled articles to the belt conveyor.

BACKGROUND OF THE INVENTION In a device of this kind, known from DE 25 44 135 A1, a strip of flat articles stacked in scales is wound around a hub to form a roll of strip. In this roll, the articles are in the same form as they were delivered by the feeding device to the belt conveyor. The belt conveyor also drives a roll of strip of scaled articles as it forms the roll.

Problems to be Solved by the Invention However, when stacking articles in a scale-like manner, or during transport of a strip made of articles stacked in a scale-like manner, external disturbances or irregularities may cause the overlapping parts of the articles to shift. This makes it difficult to wind the rolls when the scales are wound to form rolls of strips of scales, or causes such rolls to be non-circular.

It is therefore an object of the present invention to provide a flat flexible strip of scaled articles, which is capable of reducing or eliminating misalignment between the overlapping parts of the scaled articles, before winding the strip. An object of the present invention is to provide an apparatus for forming rolls of strips of sexual articles.

Means for Solving the Problems According to the invention, the object is to provide a device for measuring the distance between successive leading edges or the distance between successive trailing edges of stacked articles in a feeding device; This is achieved by providing a control device for adjusting the rotational speed of the drive motor depending on the difference between the distance and the desired distance.

Because of its moment of inertia, a roll of strip consisting of scaled articles cannot be suddenly stopped or suddenly restarted. Nevertheless, the conveyor belt drive can be controlled in response to the offset of the overlaps to reduce or eliminate the offset between the overlaps and improve the quality of the wound roll.

The shaft of the pulley for driving the conveyor belt is suitably connected to a pulse generator which delivers pulses in response to the rotation of this shaft through predetermined angular increments, these pulses being controlled by a counter which can be preset to the desired number. The detection device for detecting the edge of the article resets the counter to zero according to the detection of the edge of each article, and this counter is activated for driving accordingly once it has counted a preset number. De-energizing the motor driving the pulley shaft, the detection device re-energizes the motor when the counter is reset.

In the device known from German Patent Application No. 25 44 135, it is possible to wind up stacked bags, which are delivered at high speed from a station of a bag-making machine, without an intermediate stacking step. For this purpose,
The conveyor of this device for conveying the stacked bags in the form of scales is provided with two deflectors, one of which is placed behind the other in the conveying direction, and the deflectors are arranged alternately to convey the bags stacked in the form of scales. The film is then sent to two winding stations. This known device is expensive because two complete winding stations have to be provided.

In the production of bags, instead of immediately sending the bags from the bag-making machine in a stacked state to a winding station, the bags are first stacked to allow the glue to harden and to facilitate final inspection. is desirable. However, in order to supply the bags to be filled in a stacked stack, it is desirable to stack the stacks of bags in a stack and roll the bags to form a roll of strip of stacked bags. For this reason, the present invention utilizes a rotary feeder to help convert stacks of flat items, such as bags, into scaly items. This device may be the well-known device disclosed in West German Patent Nos. 900815 and 1277655.

In order to use the machine at high speeds, even when forming strips of scaled articles from a stack of articles, according to another feature of the invention, a belt conveyor extending transversely to the length of the belt conveyor is used. An axle is provided and two lever arms pivotally mounted at one end on the axle are slidably movable along the axle, each said arm supporting a take-up hub. supports a pin at its free end. These lever arms, one in the winding position and the other off the belt conveyor, are used to remove a wound roll of a strip of scaly material and pin a new winding hub. It can be quickly and easily reciprocated so that it can be mounted on top.

Further preferred features of the invention are described in the embodiment section.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

EXAMPLE As shown in FIG. 1, articles stacked in scales are fed to a bag winder. Since the overlapping area of the stacked articles arriving at the bag winding machine may vary, a device is provided to provide a uniformly wound supply roll with equal overlap of the stacked articles. It will be done.

For this purpose, a stack of articles with a small overlap and moving at high speed is brought into engagement with the pressure roller 25 . A sensor 26 located below the stack of articles opposite the pressure roller 25 serves to detect the edges of the article and send pulses to an electronic processing circuit 27 .

When the sensor 26 detects the scaled articles, these articles fall onto the endless belt 28, which has individual belt sections and is in contact with the pulleys 29, 30, 31, 32, 33, 34. These pulleys are rotatably mounted to a rotating conveyor frame 35. A conveyor belt is looped around the drive pulley 36 and back to a rotatably mounted pulley 29 on the frame 35. The frame 35 is rotatable about the axis of the pulley 31 and is supported by a pneumatic cylinder located substantially directly below the wound supply roll 37. These pneumatic cylinders 38 are connected to the frame 35 in order to prevent the supply roll 37 from deviating from its circular shape during the winding operation.
is made to follow the supply roll 37. Also, a supply shaft 39 is placed in a fixed position relative to the floor, and a retaining strip 40 is pulled from the supply shaft 39 and wound in layers onto the supply roll 37.

A pulse generator 41 is provided on the shaft of the drive pulley 36, and this pulse generator sends pulses to a counter 42. A motor (not shown) for driving the counter 42 and the drive pulley 36 is electrically connected to the processing circuit 27. Counter 42 can be set to a preselected count and is adapted to stop the drive motor when this count is reached. The selected count number is somewhat greater than the count number corresponding to the desired spacing of the scaled articles. Upon passing the edge of the article, sensor 26 resets counter 42 to zero. If the article is not found, the counter 42 counts up to a preset count and stops the conveyor belt 28. The conveyor belt is not restarted until the next article has passed.
As a result, the scaled articles on conveyor belt 28 are substantially regularly spaced apart.

The hub 45 of the supply roll 37 is held by a pin 46 fixed to the free end of the lever 47. The other end of the lever 47 is rotatably attached to a bush 48 together with a second lever arm 49. Lever arm 49 supports a pin 50 at its free end.
This pin 50 is similar to pin 46 but extends in the opposite direction. Pressure fluid cylinders 51, 52 rotatably connected to lever arms 47, 49
The lever arms 47, 49 and the supply roll 37
can be operated to lower onto or lift from the conveyor belt 28.

The bush 48 is longitudinally slidably mounted on a shaft 53 fixed to stands 54 disposed on both sides of the conveyor belt 28. This bush 48 is connected by a web 56 to a carriage 55 on which a roller 57 is rotatably mounted. The rollers 57 move within a channel steel 58 that interconnects the two stands 54. The free ends of the pressure fluid cylinders 51, 52 are connected to the carriage 55.
It is rotatably connected to. Bush 48 can be selectively moved with levers 47, 49 to a position in which pin 46 is disposed on conveyor belt 28 and pin 50 is disposed out of the winding range. Place the new supply roll 37 on pin 4.
6, the wound supply roll can be removed from pin 50 to prepare a new hub. When winding of the supply roll 37 on the pin 46 is complete, the supply roll is lifted off the conveyor belt 28 by the pressure fluid cylinder 51 and placed on the bush 48.
to the other end position. Then, the supply roll 37 is lowered to the floor and pulled out from the pin 46.

Pressure fluid cylinders 51, 52 connecting the levers 47, 49 to the carriage 55 are connected to hydraulic pistons.
Consists of a cylinder unit. conveyor belt 35
A conveyor belt moving around a winding hub and is pressed against the roll by pneumatic cylinders during the formation of a roll of strip of scaly material. The pneumatic cylinder 38 is approximately
The hydraulic cylinder 51 has a stroke of 100 mm,
52 moves the levers 47 and 4 as the winding operation progresses.
9 is held in an intermediate position to lift it. This pneumatic cylinder includes hydraulic cylinders 51, 52.
It is preferable to provide a limit switch to control the operation. The pneumatic cylinder 38 is attached to the frame 3
5 to the supply roll 37, for example, it has elastic properties.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the winding device, and FIG. 2 is a plan view of the winding device of FIG. 26...Measuring device, 27...Electronic processing circuit, 2
8... Endless conveyor belt, 29, 30, 31,
32, 33, 34... Pulley, 35... Conveyor frame, 36... Drive pulley, 37... Supply roll, 38... Pneumatic cylinder, 39... Supply shaft, 40... Holding strip, 41... Pulse generation device, 42... Counter, 45... Winding hub, 46... Pin, 47, 49... Lever arm, 50... Pin, 51, 52... Hydraulic cylinder, 53... Shaft, 55... Carriage .

Claims (1)

Claims: 1. At least one take-up hub 45 rotatably mounted on the machine frame, for holding a strip of stacked articles on a supply roll 37 to be formed on said hub 45; a supply shaft 39 arranged in a fixed position relative to the floor on which the machine frame is installed, supplying at least one retaining strip 40 fixed at one end to the winding hub 45; A conveyor frame 35 is rotatably attached to the machine frame with a pin passing through a pulley 31 attached to the conveyor frame 35, and a pair of pulleys 29, 3 are rotatably attached to the conveyor frame 35.
0, 31, 32, 33, 34, a drive pulley 36 operatively connected to a drive motor for driving the conveyor belt 28, and a drive pulley 36 operatively connected to a drive motor to drive the conveyor frame 35 to drive the conveyor belt. means 38 for engaging the articles 28 with the take-up hub 45 or the supply roll 37, for feeding the articles together with the holding strip 40 in a stacked state to the take-up hub 45; a feeding device for feeding a strip of scaled articles to the belt conveyor;
In an apparatus for forming rolls of strips of stacked flat flexible articles, such as stacked bags, on a conveyor belt, between successive leading edges of the stacked articles in said feeding device; or a distance between successive trailing edges, and a control device 27, 41, 42 for adjusting the rotational speed of the drive motor depending on the difference between the measured distance and the desired distance. A device characterized by: 2. The shaft of the drive pulley 36 is connected to a pulse generator 41 which delivers pulses indicative of the rotation of this shaft through predetermined angular increments, said pulses being injected by a counter 42 which can be preset to a desired value. When the counting device 26 detects each edge of each article, the measuring device 26 resets the counter 42 to zero, and the counter 42 indicates that the number of pulses has reached a preset value. When the drive motor is deenergized, then
2. Apparatus according to claim 1, characterized in that the measuring device energizes the motor when the counter 42 is reset. 3. Two lever arms 47 and 49 rotatably attached at one end to a shaft 53 extending transversely to the length direction of the belt conveyor 28 are slidably moved along the shaft 53. and each of said arms 47, 49 supports at its other end a pin 46, 50 on which said winding hub 45 is removably mounted. The device according to item 1 or 2. 4. The winding hub 45 attached to one lever arm 47 and the winding hub 45 attached to the other lever arm 49 extend in opposite directions, respectively.
The device according to claim 3, characterized in that: 5. The lever arms 47, 49 are rotatably moved by hydraulic cylinders 51, 52, and one end of each of the hydraulic cylinders is rotatably connected to the arm, respectively. , the other end of each of the hydraulic cylinders is rotatably connected to a carriage 55 extending above and parallel to the shaft 53. The device according to item 4. 6. Claim 3, wherein the one end of each of the lever arms 47, 49 is connected to the shaft 53 via a bush that is slidably attached to the shaft 53. , 4, and 5. 7. said means 38 for moving said conveyor frame 35 into engagement with said winding hub 45 or with said supply roll 37 of a strip of scaled articles is a pneumatic cylinder unit;
Claims 1 to 6 are characterized in that:
Apparatus according to any one of the clauses.