ES2296491B1 - HEAD FOR STRIPERS. - Google Patents

Abstract

Head for strapping machines. The head (1) for sanders object of the invention has the feeding and tensioning means of the strip arranged in a plate (2) and are constituted by two pairs of guide rollers (4 and 5) provided with an encoder (9), a pair of feed rollers (10 and 11), a straightener (14) and a guide channel (17), with the jaw (3) also arranged on the plate (2). The head (1) is applicable in strapping machines that use 32 mm steel strap. for strapping packages.

Description

Head for strapping machines.

Object of the invention

The present invention relates to a head for strapping machines, which has been considerably perfected in its constitutive elements with respect to similar means known and used in the current state of the art.

In general, the invention has developed some improvements in strapping heads with steel strap, which give it greater performance in precision, safety and efficiency.

More specifically the invention relates to a strapping head with its corresponding jaw, which uses steel strap for strapping packages with 32 mm strap.

Background of the invention

The strapping machines that are constituted are known based on a lane table supporting the packages, by independent racks that support vertical sliding cars and horizontally on said lane table.

The cars contain the guides for the strapping and a head that has the function of feeding, collecting, tensioning, gag and cut the strap on the packages to strap.

This type of strapping machines also have roll holder for each 32 mm strap coil. and of a strap entry device in each head, being governed through control desks with the corresponding facilities Electrical and electronic.

This type of known strapping machines, present the heads of each car regardless of having a block of valves and an electrical connection box, mainly they have means of feeding and tension of the strip and of a jaw

Description of the invention

In general, the strapping head object of the present invention, it has a series of improvements in certain parts of the jaw and the means of feeding and of strap tension, to provide greater accuracy, efficiency and security

Specifically one of the objectives of the The present invention is to provide the means of feeding and Strap tension of a simple structure and easy travel for strapping, in combination with tension and precise steering of the same.

Another object of the present invention is to provide the feeding means with a type encoder Encoder to control the length of the strap.

Another object of the present invention It consists of the arrangement of two hydraulic motors in parallel to drive the feed rollers that They drag the strap.

Another object of the present invention is to provide a connection by means of flanges to the hydraulic pistons of the jaw on its brass support plates and the union of the same also through flanges.

All this will be explained in greater detail to what throughout the description that follows.

Brief description of the drawings

The description of the object of the invention is will be based on the accompanying drawings, in which title of example and without any limiting character therefore has represented a preferred embodiment. In such Drawings have represented the following:

The first figure shows an elevation view front of the head assembly for strapping machines object of the present invention

The second figure shows a view in rear perspective of the strapping head assembly object of the present invention.

The third figure shows a view in side perspective of the head assembly for object strapping machines of the present invention.

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The fourth figure is a perspective view front of the jaw coupled to the head for object strapping machines of the present invention.

The fifth figure is a perspective view side of the jaw coupled to the head for object strapping machines of the present invention.

Finally, the sixth figure corresponds to a bottom plan view of the head jaw for strapping machines object of the invention.

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Detailed description of the preferred embodiment of the invention

The detailed description that follows from the preferred embodiment of the invention will be carried out taking as base the attached drawings, on which the corresponding parts or similar ones have been marked with the same numerical references to what along the various figures, which are the following:

one.-

Head, chief, engine head.

2.-

License plate.

3.-

Jaw.

4.-

Top guide rollers.

5.-

Lower guide rollers.

6.-

Entrance wheels

7.-

Adjustable spring

8.-

Adjustable spring support (7).

9.-

Encoder.

10.-

Fixed feed roller.

eleven.-

Mobile feed roller.

12.-

Pivoting arm

12 '.-

Adjustable Pivot Arm Spring (12).

13.-

Feed Roller Motors (10 and eleven).

13'-

Pivot arm hydraulic piston (12)

14.-

Straightener.

fifteen.-

Eccentric rollers

16.-

Fixed rollers

17.-

Guide Channel

18.-

Fixed wheels of the guide channel (17).

19.-

Guide channel part (17).

twenty.-

Bottom plate.

twenty.-

Mooring plate

twenty-one.-

Die or die.

22.-

Main jaws

22'-

Centering plates of the main jaws (22).

2. 3.-

Simple jaws

2. 3'.-

Centering plate of simple jaws (2. 3).

24.-

Main hydraulic piston

25.-

Simple hydraulic piston

26.-

Movable knife

27.-

Clamps.

28.-

Fixed blade.

29.-

Hydraulic clamping pistons.

30.-

Tempered plates

31.-

Flanges or ties of the pistons.

32.-

Separators for clamping blades

H.-

Hydraulic connections

V.-

Valve block.

AND.-

Electrical junction box.

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As can be seen according to the plans and numbering commented the head (1) for strapping machines object of the The present invention features a valve block (V) and a box of electrical connection, in addition to the power supply and tensioning of the strip is constituted by a plate (2) on the that the different elements of the head (1) and the jaw (3).

The aforementioned plate (2) has on its face front two pairs of guide rollers, one upper (4) and another bottom (5), among which a pair of input wheels are arranged (6).

One of the input wheels (6) is constantly required by a spring (7) adjustable and fixed to the plate (2) by a support (8), while the other wheel of input (6) is coupled to an encoder (9).

Under the pair of lower guide rollers (5), a pair of feed rollers (10 and 11) are arranged, the feed roller (10) being fixed and the roller supply (11) mounted on a pivoting arm (12), being both driven by two hydraulically connected motors.

The pivoting arm (12) is actuated by a piston (13 ') constantly required by an adjustable spring (12') and fixed to the front plate (2).

Under the feed rollers (10 and 11) is arranged a straightener (14) formed by four pairs of rollers (15) and (16), two of them (15) mounted eccentrically on their corresponding axes, while the rollers (16) are on fixed shafts

Between the straightener (14) and the jaw (3) a guide channel (17) of curved and base configuration is arranged of pairs of wheels (18) on fixed axles arranged in one piece (19).

The entire head assembly (1) is supported by the plate (20), to which the jaw is also tied (3) with the collaboration of a mooring plate (20 ') in the form of "C".

The jaw (3) has a die or die (21), on whose major sides six jaws are grouped main (22) separated by two centering plates (22 ') and two simple jaws (23) separated from one of the main jaws (22) by a centering plate (23 '). The main jaws (22) they are driven by a main hydraulic piston (24) and the simple (23) actuated by a second single hydraulic piston (25).

The die or die (21) also has one of its ends, of a movable blade (26), two clamps (27) and a fixed blade (28), counting in addition to two pistons clamping hydraulics (29) that drive the two clamps clamping (27), while the movable blade (26) is driven by the main hydraulic piston (24).

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All the elements of the jaw (2) are grouped between bronze plates (30) duly joined by corresponding flanges (31) and spacers (32), which also join the hydraulic pistons (24, 25 and 29) with the plates themselves bronze.

Based on this described structure, the head for strapping machines object of the present invention presents the next operation in your feeding means and tensioned:

The strap is guided by the guide rollers (4 and 5) and the input wheels (6) that are tensioned by the spring (7) turn when the strap passes between them, the encoder (9) being one of the wheels (6) which controls the length of the strap.

The strap is fed and tensioned by both rollers, fixed (10) and pivoting (11), driven by their corresponding motors (13) hydraulically connected (H). When a force is applied to the pivoting arm (12) by the piston Hydraulic (13 ') adjustable force, pivoting roller (11) press against the fixed roller (10) by feeding and strap tension. When the pressure on the pivoting arm (12) is released, the roller stops pressing which can enter A new strap.

The strap then passes to the straightener (14), whose eccentric (15) and fixed (16) axes adjust the curvature of the strapping or straighten if you have curvatures derived from your own supply roll.

The strap is driven by the guide channel (17) to the jaw (3) and once it has passed the strap wraps around the package going around, until it comes back in again in the jaw (3).

Before entering the jaw (3) there is a detector that counts the distance traveled by the strap by the encoder (9).

The strap after traveling the distance signaled by the encoder (9). the two clamps (27) driven by hydraulic clamping pistons (29) grab the strap, then by means of the pressure switches of the two motors (13), pull the strap to a certain pressure and when in strap reaches that pressure, is when the two engines (13) stop pulling of the strip and by means of the main hydraulic piston (24) they activate the six main jaws (22), performing six stapled in the strap and at the same time using the hydraulic piston main (24), the mobile blade (26) lowers and cuts the strap.

The jaws are subsequently removed main (22) and the mobile blade (26), so that through the single hydraulic piston (25), the two simple jaws are actuated (23) and make two staples on the strap and in the opposite direction to the staples of the main jaws (22) so that it does not come loose the strap.

Finally, the two simple jaws are removed (23) using the simple hydraulic piston (25), so that you can see the two clamps (27) can be removed using the hydraulic clamping piston (29).

Based on the structure and operation described, the head for strapping machines object of the present Invention, it presents the following improvements and benefits:

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He tied by flanges (31) of the hydraulic pistons (24, 25 and 29 to the plates (30), considering that as the place where it goes placed the jaw (3) is a reduced site, it is easier tighten and release the fittings by means of the flanged and stripped, that by threading and unscrewing you must currently be performed on known strappers of this type. Specifically by unscrewing all the fittings must be released, while with the de-grounding you don't have to release any fitting.

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The encoder arrangement (9) to perform the length control of the strap, it is more reliable than the hydraulic piston and spring used so far, also allowing to be regulated and modified from the corresponding control desk.

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The arrangement of two drive motors (13) in parallel for the strap feeding and tensioning, instead of a single motor hydraulic, allows a more uniform forward and reverse, a easier maintenance, lower consumption and less wear.

It is not considered necessary to make the content of the present description so that an expert in the matter can understand its scope and carry out the realization practice of the described object.

However and since in the foregoing only one preferred embodiment of the object of the invention, it is evident that within its essentiality multiple variations may be introduced, without implying any alteration of the invention. Such modifications may especially affect the size and materials of manufacturing, its essential points being the ones that are reflected in the following claims.

Claims (3)

1. Head for strapping machines, which being of special application in strapping machines of the type that are constituted by a lane table made of free-spin rollers and for which the packages to strap, which are strapped by means of frames are susceptible to slide which support vertically and horizontally movable cars on the rail table and of which the head (1) has a valve block (V), an electrical connection box (E), a jaw (3) and the corresponding feeding means and tensioning of the strap, essentially characterized in that the feeding and tensioning means of the strap are arranged on a plate (2) on which the different elements are mounted:

-

Two pairs of guide rollers on its front face, an upper one (4) and a lower one (5), among which a pair of wheels of entry (6), one of which is constantly required by a spring (7) adjustable and fixed to the plate (2) by a support (8), while the other input wheel (6) is located coupled to an encoder (9) arranged on the rear face of the plate (2).

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A pair of feed rollers (10 and 11) arranged under the torque of lower guide rollers (5), the feed roller (10) being fixed and the feed roller (11) mounted on one arm pivot (12), both being driven by two motors (13) connected in parallel hydraulically and arranged in the part rear of the plate (2), the pivoting arm (12) being driven by a hydraulic piston (13 ') constantly required by a spring (12 ') adjustable and fixed to the plate (3).

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A straightener (14) formed by four pairs of rollers (15) and (16), arranged under the feed rollers (10 and 11), two being the rollers (15) mounted eccentrically on their corresponding axes, while the rollers (16) are on fixed shafts

-

A guide channel (17) arranged between the straightener (14) and the jaw (3), with curved configuration and based on pairs of wheels (18) on fixed shafts arranged in one piece (19).

being the whole set of head (1) supported by the plate (20), which is also tied the jaw (3) with the collaboration of a plate mooring (20 ') in the form of "C". 2. Head for strapping machine, according to the first claim, characterized in that the jaw (3) has a die or die (21), on whose major sides six main jaws (22) are grouped separated by two centering plates (22 ') and two simple jaws (23) separated from one of the main jaws (22) by a centering plate (23 '), the main jaws (22) being driven by a main hydraulic piston (24) and the simple jaws (23) driven by a second single hydraulic piston (25), while the die or die (21) also has at one of its ends, a movable blade (26), two clamps (27) and a fixed blade (28) , in addition to two hydraulic clamping pistons (29) that drive the clamps (27), while the mobile blade (26) is driven by the main hydraulic piston (24). 3. Head for strapping machine, according to the first and second claim, characterized in that all the elements of the jaw (3) are grouped between bronze plates (30) duly joined by corresponding flanges (31), which also join the hydraulic pistons (24 , 25 and 29) with the bronze plates themselves.