US1610858A - Device for tensioning and binding bands on boxes, bales, and the like - Google Patents

Description

Dec. 14 1926. 1,610,858-

5. HOFFMANN v DEVICE FOR TENSIONING AND BINDING BANDS ON BOXES, BALES, AND THE LIKE Filed July 15,1925

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Patented Dec. 14, 1926.

UNITED STATES I 1,610,85t PATENT OFFICE.

EM IL HOFFMANN, 0F COLOGNE, GERMANY.

DEVICE FOR TENSIONING AND BINDING BANDS 0N BOXES, BALE S, AND THE LIKE.

Application filed July .18, 1925, Serial No. 43,359, and in Germany July 15, 1924.

This invention relates to devices for tensioning bands of hoop iron and the like around boxes or bales and then binding together the ends of the tensioned .band.

Devices of this general character are known for binding wires .on boxes and in such devices gripping jaws are carried by levers and moved by means of a screw cam for the purpose of applying the tension. The cams are mounted loosely on their shaft and are returned to their initial position by a spring after each operation of tensioning the wires is completed. Forthe purpose of applying the tension the levers carrying the gripping jaws are moved apart in opposite directions by the rotation of the cams.

This known form of tensioning device is not suited for stretching and binding flat bands, as the grippers, when applying the tension, move in the arc of a circle and it is thus impossible to guide the ends into a clip sleeve, which is used in the known manner for binding the ends of the hoop iron. The return of the tensio'ning cams by means of springs is also objectionable as I the grippers are thereby held up by the cam and failure of the machine to operate properly may result from the improper return i of the grippers. Finally the known device mentioned is not adapted for use with boxes or bales requiring widely different degrees of tension and the range of usefulness of any given machine was therefore strictly limited. f

According to this invention these defects are removed; In the first place the gripper jaws, according to this invention, are carried by slides mpvable in a straight line parallel to'the axis of the rotatable shaft or spindle on which the screw cams are rigidly mounted. In this way the ends of the bands duringtensioning are properly entered in-the bindingsleeve and are in exact register, so that reliable binding of the band can be effected. The screw cams terminate in a peak at their highest point, which is the point located nearest to the gripper slides, and from this peak the cam suddenly recedes. per slides thus rise on the screw part 0 the cam to apply the tension. until the rollers reach the peak, whereupon the gripper slides are quickly returned to their initial position The cam rollers carried by the grip-.

shaft. 0, the slides are first caused to apis .thus rendered unnecessary. The hand lever which effects the rotation of the spindle and that which effects the operation of the punch of the binding device are so located that they act mutually as steadying handles, and thereby render the entire machine more convenient and serviceable. The return movement of the gripper slides under the action of their springs may be adjusted by means of stop pins and the degree of tension applied on rotation of the tensioning cams thereby altered as required.

Referring to the accompanying drawings:

Figure 1 is :a front elevation of a band tensioning machine made with this invention.

Figure 2 is a plan of the same.

Figure 3 is a front elevation showing the position of' the gripper slides after the bands have been tensioned and the binding sleeve is in position to be operated on bythe punching device so as to clamp orbind the ends of the bands together.

. Figure 4 is a. cross section at right anglesto Fig. 3. i In carrying the invention into efi'ect, a

hollow shaft or spindle 0 is supported rotatablv in bearings 6 formed in upstanding brackets cast on the bed a or fixed thereto in any suitable manner. On the shaft 0, there are rigidly fixed two cams d, which, on the side facing the centre of themachine, have spiral or screw formed working faces. At the point nearestto the centre of the ma chine on these cam faces, the screw face terminates in a peak, d after which, in the direction of rotation of the shaft 0, there is a drop in the cam in the form of a substantially axial portion 05 The gripper slides f are suitably guided to slide along the shaft 0 parallel to the axis of the shaft and in a straight line. These slides carry arms on the screw shaped face of the tensioning cams (Z. Wedge shaped gripping jaws g,

operated by a hand lever h. are provided to grip the fastening band B in the known manner. There are two such slides and two cams, so arranged that on rotation of the proach to the centre of the machine, that is to move from the position shown in Figure 2 to that shown in Figure 3. In doing so, the band B, which has its ends clamped in the gripper. jaws g is tensioned.

The rotation of the shaft 0 is effected by bands, the binding operation being effected means of a ratchet lever It having a pawl Z pivoted to it and engaging in a ratchet vwheel i keyed to the hollowshaft 0. The

tensioned band B has its ends entered in a flattened sleeve H which has been inserted by indenting or suitably punching the sleeve so that it effectively holds and retains the band B in the tensioned state. Thestalnp- -ing device 0 is located about the centre of the machine and comprises a slidable punch n centrally mounted in a suitableupstanding bracket on the machine bed an and two side clamps m also slidable in the" said bracket 0 and adapted to clamp the sleeve H during the tensioning operation and also during the punching of the sleeve by the punch a. For this purpose, a pivoted lever 0. suitably mounted on the bracket 0 has on its boss three cam parts, two similar side parts 0 which operate the clamps m, and a central cam part 0 which operates the cen-. tral punch a. As can beseenin Figure 4, the lever 0 is turned counter clockwise-to theleftto clamp the sleeve, and in this position acts as asteady to hold the bed a during the operation of tensioning and the hand lever is in a similar way performs the same function during the operation of punching. I

Inside the hollow shaft 0 there is provided a spiral spring p which is fixed at its ends to cross bars 3, which pass radially through side slots '1" in the shaft 0 and have smallrollers s at their ends which contact with the gripper slides 7 so as to press these slides apart and thereby cause the rollers f to follow the contour of the' screw shaped faces of the cams (5. When the shaft 0 is rotated so that the top half is coming towards the observer in Figure 1, the spring 71 is compressed until the peak of the cams is reached. In this position the punching operation is performed on the sleeve H. Immediately the peak of the cams has been passed, the slides are free to be moved back into their initial positions by the direct action of the springs p, without requiring the cam to be given a rotation in the reverse direction.

The distance which the gripper slides spring back under the action of the spring mechanism described, may be regulated in 'anv'suitable manner, so as to vary as required the degree of tension imparted to the band B. In the form shown, this regula tion is effected by means of stops, which may be in the form of pins adapted to be inserted in one or other of the holes\t in 1,610,858 v c I times,.gripper slides mounted to slide on,

saidshaft and adapted to be moved axially by said tensioning cams, resilient means adapted to maintain said gripper slides in operative contact with said tensioning cams, and means located on said bed plate between saidgripper slides for binding the tensioned and.

2. A device for tensioning and binding bands of hoop iron or the like around boxes,

bales or the like having incombination, a

bed plate, a rotatable shaft mounted on-said bed plate, gripper slides for gripping the ends of and tensioning a band, said slides being,movable in straight lines parallel to F the axis of the shaft, screw shaped tension: ing cams mounted to rotate with said shaftand adapted to operate said slides, said cams having each a peak, which becomes operative when the slides have tensioned the band,

and a sudden drop portion'which immediately follows the peak, spring means operable on said gripper slides to cause the same to follow the contour of the screw cam and llg ealis for'binding the ends of the tensioned an I,

3. A device for tensioning and binding bands of hoop iron or the like around boxes, bales or the like having in combination a bed plate, a rotatable shaft mounted on said bed plate, said shaftbeing hollow and having radial .slots extending axially therein, gripper slides for gripping the ends of and tensioning a band, said slides being guided on said shaft, tensioning cams mounted to rotate with saidshaft andiadapted to operate said slides in thedirection to tension the band, a spiral spring within the said hollow shaft, vcross pins on the ends of said spring and projecting radially throughzthe' tion to that required for tensioning the band and means located on the. bed plate between x the gripper slides for binding the ends of the tensioned 'band.

4c; A device for tensioning and binding bands ofhoop iron or the like around boxes, bales or the like having in combinat1on, a bed plate, a rotatable shaft mounted on said bed' plate, [gripper slides for grlppingthe ends of and tensioning a band, said slides being guided on: said shaft toslide axlally on said shaft, tensioningeams mounted rigidly on said shaft to rotate therewith and adapted to move said gripper. slides towards one another to tension the band, aratchet lever for operating said shaft, means located on said bed plate between the grippers 'for binding the ends of the tensioned band and a hand lever for operating said means, said recited hand levers being arranged to act mutually as steadying levers during the operation of one or other of said levers.

5. A devicefor tensioning and binding bands of hoop iron or the like around boxes,

bales or the like having in combinaton, a bed plate, a rotatable shaft mounted on said bed plate, gripper slides for gripping the ends of and tensioning a band, said slides being movable in straight lines parallel to the axis of the shaittensioning cams mounted rigidly on said shaft to rotate therewith and adapted to move said gripper slides towards one another to tension the band, means for adjusting the sliding movement of said slides and means located on the bed plate between said gripper slides for binding the ends of the tensioned band.

' EMIL HOFFMANN.

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