DE2725359A1 - Closing device for tubular packaging sheaths - has clamps advanced by multiple stage punch in clamp guide path - Google Patents

Abstract

The closing device is for tubular packaging sheaths. U-shaped closing clamps (6) are advanced by a punch in a straight line clamp guide path and are closed around the packaging sheath on a mould. The punch is multi-staged to accept a closing clamp on each stage (8, 12, etc). There is a return cut-off for these clamps which are fed onto the next stage after being deposited on the first stage. A sprung holder (11) for the clamp is fitted to each of the first stages (8) and the following stages.

Description

Device for locking up

tubular packaging casings The invention relates to a device for closing tubular packaging sleeves with a U-shaped closure -clamps, which are driven by a punch in a straight staple guide track and closed on a die around the package casing, which has been gathered up like a braid will. The invention relates in particular to a pliers-like design of this type Device for closing tubular packaging sleeves.

In machines for closing packaging sleeves that have been gathered together like a braid with U-shaped locking clips are generally the locking clips of a magazine individually guided into a staple guideway, there by one Detects stamp, which drives the staple on the die and there around the plait-like The gathered packaging sleeve closes. The stamp is usually pneumatic, electrically or manually driven.

The magazine from which the locking clips are inserted into the clip guide enter, is so far away from the locking point that no obstruction arises when inserting the tubular packaging sleeve for closing. That has the consequence, however, that a longer stroke is provided for the stamp than for Closing is required, whereby the closing device experiences a larger design, than is necessary for the closing process.

In the case of pliers-like closing devices, the closing process should be as close as possible can be carried out by a single pincer connection.

There are now pincer-like locking devices are known in which the locking clip by closing it several times, namely at least three times the pliers leg moved in sections towards the locking point and locked there (U.S. Patent 3,224,083). This has the disadvantage that it is not possible to braid the bag to gather and close with a single pincer. It is also a closing device known in which the gathering and closing by a single pincer connection is carried out. However, this device provides Tension a spring before each locking process, which is disengaged when the pliers are closed and the stamp with the locking clip drives forward to the pigtail of the packaging sleeve to gather. Then the locking clip on the Die closed (US Pat. No. 3,327,514).

This has the disadvantage that several Hand movements are required. There is also a pincer-like locking device known, in which the locking clip on the by a single pliers closure Die is closed. Here the stamp is circular around a pivot point pivotally mounted, creating an arcuate bracket guide path for which the locking clips must have arched legs (DT-PS 2 300 993).

The invention is based on the object of providing a locking device, in particular to create a pincer-like locking device in which on the one hand only a short stroke is required for the closing process, but on the other hand that Magazine is arranged at a sufficiently large distance from the locking point and at Pincer-like locking devices the locking process only with a single one Pliers closure carried out without further manipulation can be and in which the usual locking clips with straight legs can be used.

According to the invention, this object is achieved in that in the case of closure devices of the aforementioned type of stamp in multiple stages for receiving one at a time Locking clip is formed at each stage.

In the device according to the invention, the side of the stamp is on which the entry point of the locking clip into the clip guideway lies, that is, the side facing the magazine, set off in several stages. In operating condition there is a locking clip on each step and only the one on the last Stage is driven on a relatively short stroke on the die. During this process, the locking clip located on the previous stage promoted to the next level, there on the return stroke of the punch by one The backstop is held in the advanced position and after the end of the return stroke pressed to the next level by a hold-down device. This arrangement will the path of the locking clip from the magazine to the locking point with success divided into several sections that by the locking clips on each locking stroke only one of the sections and not the entire way from the magazine to the locking point must be covered.

Instead of the relevant side of the stamp is deposed in several stages it is also possible to arrange several stamps of the same length on top of one another.

The fact that the device according to the invention has a smaller one Closing stroke of the stamp enables further advantages. There can be smaller aggregates can be used to drive the punch. Because of the smaller way the number of locking operations in the unit of time can be increased.

The air requirement can be considerable, especially with pneumatic drives be reduced.

It is the first time in the case of locking devices designed in the manner of pliers have been possible with a straight clip guide path for locking clips with straight legs and using a corresponding toggle lever transmission to carry out the locking process with a single pincer connection.

The number of stages depends on the distance between the magazine and sealing point is desirable depending on the size of the packaging.

The invention is illustrated, for example, with reference to the accompanying drawings described: Figure 1 shows a plan view of a lock plate of a sealing machine with exposed clip guide channel.

Figure 2 shows a longitudinal section through the lock plate according to A-A of Figure 1 with the stamp in the starting position.

Figure 3 shows the same section with the stamp in the closed position.

FIG. 4 shows a top view of a closing tong in the open position Position.

FIG. 5 shows a longitudinal section through the closing tongs with magazine.

In FIGS. 1 - 3, a closing device with a two-stage trained stamp 3 in the lock plate 1 of the Verschperrvo rrichtung the exposed Klammerfüh approximately channel 2 worked in which the punch 3 is driven onto the die 4 will.

From a receptacle 5 for a clamp rod 6 is a locking clip 7 placed on the first stage 8 of the stamp 3.

During the first stroke of the plunger 3, the locking clip 7 is of the Clamp bar 6 separated by the edge of the first step 8 and into position 9 promoted to level 12. During the return stroke, the locking clip is activated by the backstop lo held in position 9 of stage 12 and after the return stroke has been completed by the The spring-loaded hold-down device 11 is now pressed into the step 12. The next stroke will the locking clip driven from the step edge 13 on the locking point and closed on the die 4 around the packaging sleeve 14, which is gathered together like a braid. The next locking clip is brought into position 9 of step 12. After the return stroke, a new locking clip from the clip rod 6 is the first Level 8 supplied.

The pincer-like locking device according to FIGS. 4 and 5 consists from the pliers leg 15, which the clip guide channel 16, the three-stage Includes punch 17 and die 18.

The second pliers leg 19 can be rotated on the pliers leg via the bolt 20 15 stored. This pliers leg 19 drives the punch via a toggle lever 21 17 at. The clamp guide track 16, the locking clamps 22 of a clamp rod 6 supplied.

Before the first pliers closure, the first locking clip 22 is open the first stage 23 of the stamp 17 is filed. With the first pincer connection, the Closure hammer promoted to the next position of level 24. When opening the Pliers and thus the return stroke of the punch 17, the locking clip is through the Backstop 25 held in the position of stage 24 and after completion of the Return stroke pressed by the resilient hold-down device 26 to step 24. At the next Stroke, this locking clip is transported to the next position of step 27, there also held by a backstop 25 during the return stroke of the ram and after its completion pressed onto the step 27 by a further hold-down device 26. During the next closing stroke, the closing bolt will move out of the position of the step 27 driven onto the die 18 and gathered around the not shown, plait-like Packaging envelope closed.

The crimper is now in all stages with a locking clip supplied, so that with each further locking stroke a locking clip on the Die 18 driven and each stage is re-loaded.

Blank page

Claims (3)

Device for closing tubular packaging sleeves ANS P RÜC H E Device for closing tubular packaging covers with U-shaped locking clamps, which are held by a punch in a straight line Clamp guideway advanced and closed on a die around the packaging sleeve are, characterized in that the stamp 3, 17 multi-stage for the recording one locking clip is formed on each step 8, 12, 23, 24, 27. 2. Apparatus according to claim 1, characterized in that one Backstop lo, 25 is provided for those locking clips after their dropping on the first level 8, 23 promoted to the next levels 12, 24, 27 are. 3. Apparatus according to claim 1 or 2, characterized in that each of the first stage 8, 23 subsequent stage 12, 24, 27 a resilient hold-down device 11, 26 is assigned for the locking clips.