DE1811793A1 - Locking mechanism for binding machines - Google Patents

Description

The invention "relates to binding tools, with the help of which a loop of metal tape, which was made to enclose an object, stretched and then bending a fastener around the overlapping portions of the loop. In particular concerns the invention a novel locking mechanism for such binding tools, with which a pair of jaws be caused to close on a prearranged shutter that is operated in this manner for the purpose of Unbending of the closure is held.

The exemplified tool depicting the improved locking mechanism includes a Lower part, a frame on the lower part, a gripper for holding the free end of the tape, a tensioning device to move the overlapped portion of the

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Belt relative to the free end, a motor for the ■ Clamping device, a magazine for holding a stack of metal closures, opposing cooperating ones Sacks for applying and bending a sponge around the edges of the overlapped sections of the tape, an ejector finger for feeding the closures the jaws, a piston operated ram for operating the jaws, a cutter for cutting off the upper overlapped band section and a valve mechanism for actuating the tensioning motor and the plunger. Since the invention only relates to the locking mechanism, this has been explained and described in detail, while the remainder of the tool was shown only as far as it was necessary to explain the general mode of operation is required.

In order to facilitate a clear understanding of the improvements made, it appears necessary in the individual to explain the conventional locking mechanisms, as for example in the German patent application S 76 998 VIIb 81c of December 5, 1961 while similar mechanisms are used in a wide variety of binding tools and machines will. Such conventional locking mechanisms use a toggle linkage, which consists of a Paa_r upper spreading levers, the upper ends of which are hinged to a vertically movable piston-operated plunger and the lower ends of which are hinged to the upper ends of the respective jaw members. The jaw elements are hinged for pivoting movement in opposite directions, with the lower ends being the actual

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Form jaws that "move against each other when the ram moves down". As the jaws move inward, there is an initial flip of the buckle around the band. Continued inward movement of the jaws results in the final application of high pressure to the edges of the band which is compressed between the closure flanges and the crown of the closure. Multiple jaws are used on wide belts and notch blocks are inserted between adjacent jaw sections and abut against the crown of the buckle so that the intermediate jaw sections press the steel belts up between adjacent notch blocks to displace a series of offset lobes that inevitably align with the engage overlapping sections of the tape so that no slippage can occur. Such notching of the closure requires a great deal of pressure to be applied to the closure by the bending jaws on the end.

Closing mechanisms of this type have certain Restrictions. Because the toggle linkage has fixed articulation points any increase in jaw closing movement accompanied by a corresponding increase in the shock movement. Thus the ram is forced to to hike down a considerable distance during each working hood3 to bend over the breech to cause the tape to move and move a further distance to eventually complete the locking scoring operations to effect, with full force being applied to the piston during its entire stroke and large amounts of air are consumed. Also closes

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such an arrangement requires the use of long levers in the system and requires massive "tooling" construction. ~

The invention overcomes these limitations by providing a novel locking mechanism which uses a wedge element instead of the usual toggle joint between the plunger and the jaw elements is} which is carried by the ram and acts directly on the jaw elements to turn them into opposite ones Pivot directions. Such an arrangement results in a shorter slide stroke as a result of the disconnection the usual spreading lever allows. Thus, in the case of a pneumatic binding tool, the shorter piston displacement results a decrease in the height of the piston chamber and an associated decrease in height and the weight of the tool.

A feature of the invention resides in the shape of the Wedge element and in the manner in which it spreads the jaw elements, the shape being such that a rapid jaw closing movement is achieved during the initial downstroke of the ram resulting in a Folding the sealing flanges around the tape is followed by a brief, final jaw movement during which the folded Fastening flanges compress the tape, and this compression is indicated by a notch in the fastening edges accompanied as described above. Since the initial rapid jaw movement takes place, when low pressure is required, and the final slow one. Jaw movement occurs when high pressure

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is necessary, is the application of thrust to the The ram is largely balanced during its downward movement and the ram performance curve becomes smoother.

The invention is explained below with reference to the drawing described. Show in it:

Pig. 1 is a side view of a pneumatic binding tool with the locking mechanism according to FIG the invention}

ig. Figure 2 is a bottom plan view of the mechanism;

Pig. 3 is a section along line 3-3 in Pig. 1, showing the jaws bending the breech completely retracted}

Pig. 4 is a section showing the bending over of the closure Shows baking just prior to notching;

Pig. 5 a section showing the jaws in their final showing closed position;

Pig. 6 is a partially exploded view of a ram release mechanism and

Pig. 7 is a section along line 7-7 in FIG Pig. 2.

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BATH ORIGINAL

In Fig. 1 and 2 a binding tool 10 is shown, which has the improved locking mechanism and is of the general type _f as shown in the above-mentioned German patent application S 16 998, and only the parts of the tool that relate to the Ter -3 closing meohanisnus according to the invention have been shown. The tool 10 has a lower part 12 with a suspension handle 14 which ends in a suspension hook 16 which lies above the center of gravity of the tool. The lower part 12 has a flat bottom 18 (Pig. 2) which can be placed on the object to be bound. A generally spaced-apart support surfaces 20 and 22 protrude laterally from one side of the lower part and form a gap 24 which is long enough to allow the entry of the jaws of the locking mechanism to bend a metal fastener S (Fig. 1) around the lap Sections of a lie tall band to make it possible.

The verse clianisnius is b. denoted by 30, and the stacked closures S are grounded from a rack 32 by means of an ejector arm 34 (see also Pig. 7) that touches the bottom shutter and him between the cheeks of the closing mechanism and -nism 30 pushes. The Ausv / erferarra 34 and the Llagazin 3-become carried on a main frame 36, various of the Share in Pig. 1 and 2 appear. The frame is fastened to the lower part 12 by means of screws 38 and carries a combined valve and cylinder housing 40, which has a cylinder section 42 and a valve section 44. The valve mechanism is un-

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operated under the control of a pair of levers 46 and 48, to initiate the tape tensioning, locking and cutting process.

At the front end of the lower part 12 is a support 50 projects upwardly and supports a pivot shaft 52 for a pivotable frame 53 'on which a pneumatic tensioning motor arranged 54 is _H t. A feed wheel 56 on shaft 58 operates with a serrated backing pad 60 on ™

the lower part 12 together, which overlap the lower Section of the tape grips while the feed wheel advances the upper section in the tape tensioning direction. The shaft 58 is supported by the frame 53 under the pivot shaft 52 worn so that when pivoting movements on the frame are applied, the feed wheel 56 except and raised and lowered into engagement with the support pad 60. Are releasable locking means provided to hold the frame 53 against the action of a spring. Controls at the rear of the tool a depressible lever 62 for raising and lowering a rear gripper 64 (Fig. 7), which the free end ^ f of the tape at the time of loading the tool.

After the Vez closing mechanism 30 has been actuated, around the fastener S around the overlapping portions Bending the tensioned loop around contacts a cutting blade 66 resting on a movable sealing unit 70 is carried to cut a solid cutting block 72, • on the free end of the tape.

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The arrangement thus far described is entirely conventional, and the simplicity is in accordance with the present one Invention lies in the construction and operation of the locking mechanism 30, which is described in detail below is described.

According to Fig. 3 »4 and 5 is the locking mechanism 30 operable under the control of a vertically movable plunger 100, which is connected to the cylinder section 42 of the housing and connected to a shaft 102 and an enlarged head 104 is equipped. The shaft. is attached to a piston 106 which is arranged in a cylinder 108. The shaft 102 protrudes through a bottom wall 110 of the cylinder 108 through it, and the head 104 is positioned outside the cylinder and in a vertical position Bore 112 in a jaw carrier 114 ″ is displaceable. The head of the plunger 100 is provided with shoulders 116 on opposite sides, and the lower end the head is beveled in four directions so that the lower portion of the plunger is down and down has inwardly inclined sides 117, which are curved with a large radius and in a small radius on the Point 118 merge into the bottom of the ram. These sides form curved surfaces in the manner of a «wedge cooperate with a pair of latch bending jaw members 120 to impart the latch bending motions To give. The lower portion of the plunger is also provided with inwardly sloping flat sides 122 which do not impair the spanking function of the jaws. This lower inverted pyramid section of the plunger 100 is hereinafter referred to as wedge 124.

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The jaw carrier 114 is provided with a downwardly protruding Side plate 123 (Fig. 1 and 7) provided, which in connection with the cutting blade 66 has a cage-like

gen space 174 for the two jaw elements 120 forms. The cutting blade 66 is attached to the jaw carrier 114 by means of a firmly molded square extension 125 (FIG. 7) attached, which protrudes into a square opening 126 in the cutting blade and serves to the cutting blade and hold the jaw support 114 upright and guide it vertically. A spring wedge 128 between the cutting blade and the wall of the breech magazine 32 still supports the guide.

As shown in Figures 6 and 7, the head 104 of the plunger 100 has a notch 130 in its outer surface, those with a cam latch 132 in the form of one in the jaw carrier 114 arranged pivot shaft cooperates. The latch 132 is provided with a recess 134 to form an edge 136 that coincides with the notch 130 below the influence of a spring 138 (Fig. 1) can be brought into contact to the carrier 114 with the plunger 100 to common Lock movement. One end 140 of the latch 132 protrudes outward and has a flat surface 142 for engagement with a lug 144 on the main housing, When the cutting blade and jaw carrier 114 follow suit move down. If the cam bar contacts the shoulder, further downward movement of the carrier 114 is prevented, but the angular rotation of the latch 132 pushes the edge 13C of the latch out of the notch 130, whereby the ram is released for further downward movement. During the initial downward movement of the jaw

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gers 114 before the cam latch 132 and the lug together come into contact, the wearer move and cutting blade 66 together and none occurs relative jaw movement so that the two jaws only serve to hold a lock in place, after the engagement between the latch and the neck has taken place to release the plunger is used an initial downward displacement of the plunger relative to the jaw carrier 114 to produce a rapid jaw closing movement to effect, but only until the locking flanges have been bent around the edges of the tape. Thereafter continued downward movement of the ram serves to effect the final scoring process in which da3 tape firmly between the sealing flanges and the The crown of the clasp is compressed and various pieces of lead are notched in the manner shown in the above-mentioned German patent application 8 76 998 is described.

As shown in Figures 3, 4 'and 5, each jaw member is composed a plurality of sections 14S arranged in parallel at a distance from one another and lying therebetween Notched bars 150. Further notched bars 154 are outside of the jaw members as shown in ^ ig * 7. Each jaw member 120 is pivotable about a horizontal axis by means of a fixed pivot pin 156 the ends of which are fixed in the cutting blade 66 and in the side plate 123. The. Notch bars 150 are the same, and the outer ends of each rod are on hinged to the jaw elements by flying pins 15 ^, through the bath section with a loose frame,

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protrude. Langlöoher 160 in the rods 150 receive the pins 156. The lower ends of the baoken elements form the actual jaws 162, which can be moved towards and away from one another when the jaws are in place Pivot in opposite directions. Sons Grooves 164 in the jaws hold the closures S in place as they are sequentially fed from the LIagasin 32

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The wedge 124 operates with a pair of cam follower rollers 170 at the upper ends of the jaw elements 120 together, and these rollers are rotatable on pins 172 stored. A downward movement of the ram 100 relative to the jaw carrier 114 causes the wedge 124 of the ram penetrate between the two rollers 170 and push them apart, causing a pivoting of the Bakkenelenente 120 in opposite directions and thereby an inward movement of the jaws 162 for the purpose of Compression of the closure is effected. To the jaws again during the upward movement of the ram withdrawing are the top ends of a pair of ™

Levers 176 pivotably mounted on a pin 178 which protrudes through the head 104. The lower ends of the Levers have slots 180 sun receiving the tenons 172.

When operating the locking mechanism when the Piston 106 is raised, the plunger is in the Pig. 3 and the jaw carrier 114 is raised. The pull levers 176 hold the jaws 162 in their position of maximum opening and far enough apart so that uu a closure S under the action of the ejector

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poor 34 take up. At this point the two rollers 170 touch each other. When the ram moves downwards, the carrier 114 with the entire sealing unit is lowered and carries the fastener S down into a saddle-like position on the overlapping sections of the tape. During this downward movement, the cutting blade 66 cooperates with the cutting block 72 to cut the top portion of the tape. Downward movement of the jaw carrier continues until the cam latch 132 contacts the boss 144, preventing further downward movement of the carrier while it releases the plunger for further downward movement. As the ram moves further down, the sharply curved points 118 of the wedge 124 contact the rollers 170 to initiate the soleplate molding and locking operation.

It should be noted that the wedge initially contacts rollers 170 at locations that are on vertical planes lie, which dioht run on the axes of the rollers, so that the mechanical action that tends to 'affect the rollers moving apart is small, while the resulting movement of the rollers is rapid.

After the rollers 170. on the flat curved sides 117 are reached, a steep cornering angle comes into action and exerts a strong pushing force apart Roll out 170 necessary to perform the notching process. ■

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From the above description it will be understood that the opposing force exerted on the plunger during its downward movement is exercised is balanced over its entire stroke. This is achieved by using a small curve angle to increase the counterforce and to generate a fast jaw closing movement during the bending portion of the stroke where the locking resistance is low and by using a large curve angle to generate a slow jaw closing movement with a high Pressure when the locking resistance during the notching process is great.

The repatriation; the locking jaws in their ■ The starting point for releasing the bent-over fastener S and receiving a new fastener is carried out by the lifting action of the pull lever 176? If the plunger is moved upwards. An upward movement of these levers pivots the two jaw elements 120 in opposite directions until the two rollers 170 touch. At this point, the lock latch 132 is in contact again the notch 1JO in the ram head 104, and the jaw carrier 114 is raised to its uppermost position so that the parts assume the positions shown in FIG.

In connection with the return of the ram 100 is driven by rollers 170 on surfaces 117 and 118 no cornering effect exerted, so that these roles Do not turn during the jaw opening movements. By this arrangement and by the fact that the roles are not forced to change their direction of rotation, 'the service life of the tool is significantly increased, since no The need to replace the bearings occurs.

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Claims (10)

-H- claims: 1. Binding tool with a locking bending unit of the type with opposite jaws, a jaw carrier, a jaw actuating element which can be moved vertically on the carrier, a pair of jaw members interposed at spaced locations on the jaw support their ends are hinged, and opposite jaws touching the spanking at the lower ends of the jaw elements, which can be moved towards each other and away from each other between closed and open positions are characterized by a wedge (124) carried by the jaw actuator (100) and for pushing apart Penetrating between the upper ends of the jaw members (120) and for withdrawal from the upper ends thereof is arranged to cause a corresponding closing and opening movement of the jaws (162), and means (106, 108) for moving the jaw actuator (100). 2. binding tool according to Anspruoh 1, characterized by an anti-friction roller (170) at the upper end of each Jaw element (120), these rollers being able to be brought into contact with the wedge (124) and serving to the to transmit the pushing apart action of the same on the jaw elements (120). 3. binding tool according to claim 2, characterized in that that the lobes (170) in the open position of the jaws (162) touch each other tangentially and thereby limit the amount of jaw opening movement. 909827/1067 -15- BAD ORIGINAL> ^v 4 · binding tool according to claim 2, characterized by a release lever connection (172, 176, 173, 180) between the jaw actuator (100) and the upper End of each jaw element (120) that is effective, including the jaws (162) during the upward movement of the Jaw actuator (100) in its open position traced back. 5 »binding tool according to claim 2, characterized marked ^w characterized in that the rollers (170) are initially brought in positions in contact with the wedge (124) lying on the vertical sectional planes that pass close to the axes of the respective rollers. 6. Tying tool having a latch bender of the type with opposing baoken for bend a closure with a crown section with downwardly protruding side flanges around the overlapping section a Bandscliloif e, with this unit a Jaw carrier, a plunger which can be reciprocated vertically in this carrier, a pair of jaw elements which are attached to ^ j ir. Distance from one another are hinged to the jaw carrier between their ends, and to the includes opposing jaws disposed at lower ends of the jaw members in contact with the shutter, those against each other and away from each other between closed and open positions are movable and in contact with the closure flanges during their closing movement can be brought, ura initially a progressive bending of the same to cause the overlapping sections and then these sections between the flanges 9 0982 7/1067 -16- BAD ORIGINAL;. ; · ^> * \ - - 16 - - ■ see and compress the crown section, characterized by a wedge (124), which is from the ram (100) is worn and effective during its downward movement is to penetrate between the upper ends of the bake elements (120) and exert a cam-like and urging action on them, thereby the jaw elements (120) to pivot in opposite directions in order to bring about a closing movement of the jaws (162), this wedge (124) being provided with curved surfaces (118) with a wide curve angle and little gain in work, an initial rapid pushing apart action and consequently rapid jaw closing movement exercise during the bending portion of the closure bending process, and with curve surfaces (117) with pointed Angle and relatively high labor gain to have a final and relatively low "pushing apart" effect and consequently a relative Baoke closing movement during the band pressing portion of the bending operation, and means (106, 108) for reciprocating the Jaw members (120). 7. binding tool according to claim 6, characterized by one-at the upper end of each Baokenelementes (120) arranged anti-friction roller (170), these 'roles with the curve surfaces (117, 118) of the wedge (124) in contact can be brought and serve to reduce the pushing apart effect of the same on the jaw elements (120) transferred to. 8. binding tool according to claim 7, characterized in that the rollers (170) in the open position of the 909827/106 7 -17- Jaws (162) touch each other tangentially and thereby limit the amount of jaw opening movement. 9. binding tool according to claim 7, characterized by a release lever connection (172, 176, 178, 180) between the jaw actuator (100) and the top of each baoke element (120) for retraction the jaws (162) in their open position during the upward movement of the plunger (100). 10. binding tool according to claim 8, characterized in that the curved surfaces (117) with a pointed Curve angle can initially be brought into contact with the rollers (170) at locations that are on vertical cutting planes lie in close proximity to the vertical axial planes of the rollers. 909827/1067 , Ti. Blank page