CN1039690C - Strapping machine with a guide frame - Google Patents

Abstract

The invention relates to a strapping machine with a belt frame which forms a channel (22) of rectangular cross section which is twisted over a certain length, the frame consisting of a fixed part (18, 24, 27) and a movable part (19, 25, 28), the channel being closable and openable by means of a relative movement caused by the frame in order to eject the belt and to tension it in the longitudinal direction. In order to simplify the production and increase the operational reliability, a linearly movable frame part (19, 25, 28) is provided, which forms a torsional channel section in cooperation with the stationary frame part (18, 24, 27).

Description

Strapping machine with a guide frame

The invention relates to a strapping machine with a guide frame, which frame constitutes a channel of rectangular cross-section twisted over a certain length area, and the frame is composed of fixed and movable frame parts, driven and caused by the frame With relative movement, the channel can be closed and opened to eject the tape and tension the tape lengthwise. Such a machine is used, for example, for bundling stacks of newspapers or parcels. The straps are preferably made of metal or tough plastic and come in a variety of widths and thicknesses.

This machine is characterized in that the belt guide frame and the channels contained therein for forming the belt loop through the belt have spatial, ie three-dimensional, curves. After the strapping process of the bundled objects is completed, the straps form a tight bundle, forming the known flat strap loop. The plane thus defined is called the strap plane. In the machine under consideration, after the belt has been tensioned and left the belt guide channel, the belt loop is turned or deformed into the strap plane. The strap loop is transformed from a spatial shape into a final planar shape. The entire fixed belt guide frame composed of multiple parts will be configured in such a way that the bundled objects can be conveyed without turning on a straight line, and the strap plane is also located in the conveying direction.

The inextensible belt used here cannot be conveyed through a curve whose crank axis is perpendicular to the plane of the belt. If the belt is forced to travel on such a curved track, it needs to be twisted, ie around its longitudinal axis. For this reason, the non-planar conduction frame has a complicated configuration. The actual track curve includes the necessary torsion channel sections. However, this requires considerable technical effort for the cover and another movable frame part in order to open and close the channel.

The strapping machine type referred to in the above introduction is known from DE-OS4100276. Wherein relates to a kind of cross strapping machine, when considering removing wherein transverse frame, also can occur above-mentioned shortcoming. The belt guide frame itself, which acts as the longitudinal strapping, has several moving frame parts, each of which has its own drive magnet.

Another machine of this type is proposed by German patent application P4139571.9. In this case, the upper part of the belt frame forms a planar frame, so that at least this section is opened in a conventional manner.

The conventional technique for a simple transverse strapping machine consists in that the entire guide frame parallel to the strapping plane is divided into two parts, one of the two parts has a groove, and the moving parts move in a direction perpendicular to the frame plane The upper rest is placed on the fixed part. The above-mentioned groove and its cover thus form the tape-conducting channel.

The object of the present invention is to create a simple and reliable longitudinal strapping machine.

Starting from a strapping machine of the type described in the introduction above, this task is solved according to the invention in that a strapping machine with a guide belt frame is provided, the frame of which constitutes a rectangular cross-section twisted over a certain length region. The channel, and the frame is composed of fixed and movable frame parts, driven by the frame and caused by relative motion, the channel can be closed and opened to inject the belt and tension the belt in the length direction, wherein a linear motion A frame part that cooperates with a fixed frame part to form a torsion channel section. In principle, the cross-sections of the two parts of the strip frame are configured such that the mutual abutment surface forming the channel separating gap is a twisted plane. However, the greater the curvature of the channel curve and the greater the angle of torsion, the more difficult it is to manufacture such a frame part. In summary, an advantageous solution of the stated task consists in that the largest possible section of the belt guide channel is composed of only two parts which move linearly back and forth relative to each other in order to save installation space and individual drives. The fewer individual parts are arranged, the greater the reliability of preventing the strap from slipping out of the guide channel by mistake.

In the case of twisted channel sections that are simply bent into a three-dimensional curve, considerable costs are required for the production of the guide strip frame parts. Therefore, in order to simplify the production and improve the accuracy of the mutual fit, it is proposed that a part, especially the movable frame part, has a circular arc-shaped complete cross section, in which there is a channel cross section with a radially extending long central axis, And the other frame member has a circular arc-shaped concave section of the same or larger diameter. A frame part configured in this way is particularly simple to produce. They can rest against each other without displacement and the grooves are closed cleanly by the concavely arched frame parts, which is also routinely possible for the position of the angle of rotation. This basic shape also applies to the guide strip frame section in which the channels are bent into an arc, in the initial area of the arc the channels are twisted in one direction of twist and in the area of the end of the arc in the other direction of twisting twist back. Wherein the channel can pass through an arc of 90° or greater, and the area of the twist angle can be 90° or greater, as long as doing so facilitates the jumping of the strap into the strap plane. The concavely arched cross-section of the frame parts may vary along the channel. As long as the edge portion is not needed for covering the groove or forming a channel, this portion can be cut off, thereby enabling the movement of the belt to be unhindered when tensioned. The arc-shaped cross-section is a complete circular cross-section in the simplest case. In this case, the grooved part can be produced from a circular cross-section material which is bent into the desired shape before or after milling the groove. This circular section material can then be joined by welding or screwing with suitable reinforcement members. On the other hand, lath or flat material with correspondingly rounded edges is also suitable. Metal and plastic are conceivable as raw materials, the plastic profiles being held together by metal strips and used for mechanical reinforcement.

The most favorable solution for realizing the object of the present invention from all aspects is: the whole guide belt frame with the curved three-dimensional direction of the longitudinal strapping machine is made up of a single fixed part and a single movable part, wherein the movable part can move It is conveyed horizontally and approximately in the direction of the angle bisector of the horizontal curve of the lower frame section. The fixed and movable parts can thus be combined from frame sections of different cross-sections, wherein the simplest cross-sectional shape is always chosen, but with which the technical requirements of the work can be met. In particular, the strap channel must be "sealed", that is, when the strap is injected, the strap cannot fall out of the channel through any small holes. In addition, it should be neither clamped nor bumped, and it should not be blocked when the belt is taken off after the channel is opened. From this point of view, it is proposed that the guide strip frame with the above-mentioned spatial curve is formed at least in the horizontal curve section with frame parts which are twisted back and forth and have a circular cross section. It is also possible to use other curved or rectilinear frame sections with twisted or extended belt channels. Preferably the entire conduction channel is simply formed from such a one-piece part.

Finally, the invention is not limited to cross-sections of the conduction frame with rectilinear or circular contact lines. The contact line, ie the separation line, can also be arranged in such a way that the channel cross-sections are separated diagonally, wherein the separation line is substantially perpendicular to the longitudinal center axis.

An exemplary embodiment of the invention with different strip frame cross sections will be described below with the aid of the drawing. Attached are:

Figure 1: Top view of the essential components of the longitudinal strapping machine in the closed state of the guide frame;

Figure 2: Cross-sectional views of the conduction band frame viewed from the direction of the jet;

Figure 3: View of the strapping machine facing the conveying direction;

Figure 4: The cross-sectional view continued in Figure 3;

Figure 5: Side view of the machine shown in Figure 1;

Fig. 6: Top view similar to Fig. 1 in the state where the guide frame is separated;

Figure 7: Some cross-sectional views given in Figure 6; and

Figure 8: Another example of a guide strip frame cross-section.

Figures 1, 3 and 5 schematically depict a conduction frame. Briefly, the frame consists of an S-shaped, approximately horizontal lower section, two vertical sections and a horizontal upper section, The upper section diagonally intersects the lower section. In addition, in Fig. 1, the transmission device in the form of two conveyor belts 1 and 2 is shown here with a dotted line, which can also be a push rod or other transmission mechanism, the transmission direction of which is indicated by the arrow 3. Of course, the conveyor belt can also run in the opposite direction. The conveyors are arranged adjacent to each other in the conveying direction, offset and extend along the belt guide frame shown in FIG. 1 . Figure 1 shows that the S-shaped lower frame part is uncovered by the conveyors, so that the straps can protrude upwards through slots located in the conveyor table, not shown, between the conveyors along the lower frame shape. Finally, a rectangular object 4 to be bundled is placed on the strap, and the object is represented by a dotted line in the figure.

Observe carefully, the lower section of this conduction belt frame is made up of two arc sections 5 and 6, and these two arc sections bend 90 ° to the left and right respectively, and space 7 is vacated in the middle thereof. In the place of the recess 7 there is a tape head, for which only the plate-like upper part 8 which can be moved laterally is depicted. In the top view, the tape guide frame is slightly bent (dropped) downwards on the straight section between the tape head and the beginning of the arc section 6, which is best seen in FIG. 5 . On the horizontal arc section 6, a vertically upward guiding arc section 9 is connected, followed by a vertical section 10 twisted to the left, an arc section 11, a straight line section 12 above, an arc section 13 leading downwards, again to The vertical section 14 twisted to the left ends with an arc 15 which merges into the horizontal arc 5 in the lower section. A short upwardly bent branch follows the arc 5, which again meets the tape head.

The strapping 16 , shown only in FIG. 5 , runs in the conveying direction along the aforementioned sequence of guide frame sections and wraps around in a belt plane parallel to the conveying plane. Its front end 17 finally passes through the arc section 5, and then the sealing head tightens the belt loops, cuts off the tied belt, and seals the two ends to each other.

Especially seen in Fig. 1, 2, 6 and 7, the arc section 6 and the section connected to the front are formed by a plate-shaped but also lath-shaped or other suitable fixing part 18 with a fixed cross-section, The movable part 19 is formed of a rod of circular section and has a radial slot 20 . The narrow side of this groove is covered by the inner cylindrical surface 21 of the part 18 and thus forms a conduction channel 22 of rectangular cross-section shown in dashed lines in the top view in FIG. 1 .

The groove 20 is twisted through an angle in the bottom region by twisting along the length of the rod of circular section around the central axis and (in the direction of tape exit) first by 90° to the right, as shown in cross-section a in FIG. 2 , b and c, and re-twisted 90° to the left near the end of the curve. The inner cylindrical surface 21 of the part 18 has a radius of curvature slightly greater than that of the bar of circular section, the shape of the former following the bar of circular section over its entire length, but with corner areas not required to cover the groove 20 cut away. This is shown in the comparison and top view of sections a and c in FIG. 2 . Therefore, the upper edge 23 of the part 18 obliquely covers the round section bar 19 in a top view, and then tilts back again, where the fixing part 18 seems to partially cover the round section bar with a curved tongue. The rod of circular cross-section thus forms a kind of belt guide in combination with the part 18 and forms a very good fit.

Then the arc section 9 of 90° and the guide belt frame section up to the section 15 are composed of a fixed part 24 of a flat iron plate configuration and a movable part 25 of a square cross-section rod configuration. The square section rod is preferably machined from a suitable smooth plastic, for example a polyethylene. On the side adjacent to the flat iron plate 24, there is a longitudinal groove labeled 26, which has the same size as the groove 20, and it cooperates with the flat iron plate 24 to extend the conduction channel 22 seamlessly. , the subsequent twisting and bending of the strip frame section is jointly formed by these two parts 24 and 25 . The upper sections 11 , 12 and 13 of the belt guide frame form an angle of, for example, 35° to the conveying direction. Correspondingly, the twist angle of the two segments 10 and 14 is approximately 55°. The arc section 15 finally leads the channel back into the lower plane.

The entire tape guide frame then travels along the channel 22 with the following sections: the horizontal channel width side at the exit of the taping head; the downward bend; the curve 6 twisted back and forth in the horizontal direction; the 90° upward bend in the vertical direction The curve 9 of the curve 9; the section 10 that twists to the left about 35°; the curve 11 that bends over 90° to the horizontal direction; the straight line section 12 that intersects with the banding head; the curve 13 that bends 90° downward to the vertical direction; Segment 14 twisted to the left about 35°; curve 15 bent 90° to the horizontal; curve 5 twisted back and forth in the horizontal direction towards the tape head; an upwardly bent portion; and, at the meeting point of the terminal end and the tape head. Such an entire tape guide frame is made up of stationary parts 18, 24, 27 and moving parts 19, 25, 28, which are guided horizontally and approximately in the direction of the angle bisector of the horizontal curves 5,6.

The arc section 5 and the arc section 6 are similar in structure except that they are curved curves in opposite directions. Here, however, the fastening part 27 is curved inwardly, while the groove of the corresponding rod 28 of circular cross-section is curved outwardly. Here too the part 27 is covered with a rod of circular cross-section and ensures a guiding effect during the joining of the parts and a reliable covering of the groove.

For ease of understanding of the illustration, all connecting parts, reinforcements and guides have been omitted, although they are essential to the actual construction of the invention. The round section rods are welded or screwed to a rail or to a corresponding frame side in order to be connected to each other and fixed in their spatial position. It is better to utilize corner profile parts instead of the flat iron plate 24 because of its higher rigidity. It is however important to point out that all the above-mentioned segments of the fixed and movable frame parts are connected to each other in a suitable manner and represent themselves a rigid structure. The movable part combined in this way is movably supported in the sliding guide, so that it can move back and forth in the direction of the angle bisector of the arc segments 5 and 6, as indicated by arrows 29 (opening direction) and 30 (closing direction) of. Figure 6 shows the open position and closed orientation. The movable and fixed frame parts move back and forth obliquely to their direction of extension, and as a further consequence the two integral parts have a different distance from each other everywhere in the open position, but this is not critical for their function. It is important that the strap has enough room under tension to be pulled out of the channel after the guide channel has opened. This is guaranteed as shown in FIG. 6 . Its opening movement is driven, for example, by four pneumatic pistons and takes place in bursts. Thus, by means of the embodiment of the tape guide frame described above, it is achieved that the tape jumps into the predetermined strapping surface passing through the tape wrapping head, without the need for a guide member and a tape pusher member.

Figure 8 shows a variant of the cross-sectional configuration of the two guide frame parts. Two cooperating slide parts 31 and 32 are provided here, forming a belt-conducting channel 33 next to their contact surfaces. In this case, a broad side and a narrow side of the section of the belt channel 33 are formed on each of the two slides. The other area of the contact surface forms a separation gap 34 which is perpendicular to the plane of the belt and which is important for friction-free feeding of the belt. In the four sectional views l to o, the conduction channel is shown twisted by 90°. Through the partially wedge-shaped configuration of the contact surfaces, here too, good guidance of the combined sliding parts relative to one another and precise positioning of the tape guide channel in the closed state are achieved in order to ensure friction-free feeding of the tape.

Claims (11)

1. There is a strapping machine with a belt guide frame, which frame constitutes a channel (22, 33) twisted on a certain length area of rectangular cross-section, and the frame is composed of fixed frame parts (18, 24, 27; 31) and movable frame parts (19, 25, 28; 32), driven by the frame and caused by relative movement, the channel (22, 23) can be closed and opened so as to inject the belt (16) and tension the belt in the length direction (16), characterized in that a rectilinearly movable frame part (19, 25, 28; 32) is provided, which cooperates with a fixed frame part (18, 24, 27; 31) to form a twisted channel section (5, 6). 2. The strapping machine according to claim 1, characterized in that: the moving frame part (25) has a groove (26) extending along a contact surface in a twisted plane configuration and a twisted axis, the depth of which is equivalent to the channel The maximum width of the cross-section; and the corresponding fixed frame part (24) has a resting surface corresponding to the contact surface of the moving frame part. 3. The strapping machine according to claim 1, characterized in that the course of the channel section (6) is curved. 4. The strapping machine according to claim 1, characterized in that the course of the channel section is three-dimensional. 5. The strapping machine according to claim 1, characterized in that a special moving frame part (19, 28) has a circular arc-shaped complete cross-section in which a passage with a radially extending long central axis is emptied The cross section (20); and correspondingly another frame member (18, 27) has a circular arc-shaped concave section with the same or larger radius. 6. Strapping machine according to claim 5, characterized in that the two frame parts (18, 19; 27, 28) form a channel section which forms an arc (6; 5) in which The area where segment (6; 5) begins twists the channel in one direction of rotation, and the area where segment (6; 5) ends twists back into the channel in the other direction of rotation. 7. Strapping machine according to claim 6, characterized in that the arc segment (5, 6) is a 90° arc and the twist angle area is 90°. 8. Strapping machine according to claim 1, characterized in that the entire guide frame runs along the channel (22) with the following sections: - the width of the horizontal channel at the exit of the tape head; - downward bending part; - curve (6) twisted back and forth in the horizontal direction; - a curve (9) bent upwards by 90° in the vertical direction; - section (10) twisted to the left by about 35°; - a curve (11) that bends 90° to the horizontal; - Straight line section (12) intersecting with the head spanning; - a curve (13) bent 90° downward to the vertical; - section (14) twisted about 35° to the left; - a curve (15) bent 90° to the horizontal; - a curve (5) that twists back and forth in the horizontal direction towards the head of the tape; — an upwardly bent portion; and - at the meeting point of the terminal and the head of the tape, Such a whole guide frame is made up of fixed parts (18, 24, 27) and moving parts (19, 25, 28), the latter is in the horizontal direction and approximately at the angle bisector of the horizontal curve (5, 6) direction is guided. 9. The strapping machine according to claim 5, characterized in that a curved course of the belt guide frame is designed to be twisted back and forth. 10. Strapping machine according to claim 9, characterized in that the entire guide frame is formed by frame parts of circular cross-section. 11. The strapping machine according to claim 1, characterized in that the fixed and movable frame parts (31, 32) are separated on diagonal corners of the section of the guide belt channel (33) in the contact area, wherein the separation gap (34) is substantially perpendicular to the belt plane.

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