DE102008060071A1 - Gluing device for e.g. dispersion glue of adhesive binder, has gluing roller for gluing during stopping product, where roller is moved under block back through forward stroke and return stroke - Google Patents

Abstract

The device (2) has a gluing roller (4) for gluing during stopping a product, where the roller is moved under a block back through a forward stroke and a return stroke. The roller runs below the roller back with a small distance during the forward stroke and with a larger distance during the return stroke such that distance change is produced by mechanical units e.g. gear wheel (10), intermediate gear (11), gear rod (12) and pneumatic cylinder (13), or pneumatic unit. The mechanical units lift and lower a housing (3) on adjustable mass.

Description

In An adhesive binder becomes stacks of signatures or single sheets or also thread-stitched blocks after any back machining glued on the back. The glued back surface is then in a Fälzelstation with a Fälzelstreifen provided or in a pressure station with an envelope, as the case may be whether a block for hard-bound books or brochures should arise.

Furthermore is done close to the back partially side gluing, why the block by a certain amount from the transport element hang out. For the transport system are the various solutions have become known. The blocks be z. B. by one-piece brackets or by belt or Chains transported with transport elements.

block clamps can be in circumferential circular or oval shaped Be guided systems or linearly reciprocated become. Clamping belts or chain transports transport linearly and can be either continuous or intermittent become.

Scrolling Systems are usually higher for perfect binders Performance used. All machining operations take place in the pass. Gluing machines are used for gluing. The Transport speed of the blocks in the transport system corresponds while the peripheral speed of the glue rollers. It is the on the circumference of the glue rollers located, in its thickness Squeegee certain glue film transferred in part to the block spine. In general, two rollers are directly in the transport direction of the Blocks in a row lying with the block back in effect brought. The first roller is set so that they have a has little distance to the block back while set the second roller at a greater distance and over the squeegee control a thicker glue film wearing. When processing hotmelt closes the applicator rolls an opposing roller smaller Diameter, the so-called spinner roll, the glue application smoothes and retains glue thread. at Processing of dispersion glue is used instead of the spinner roll used a squeegee.

Often exists in booklet making when the amount of Envelopes smaller than the block height is the necessity on the protruding foot of the block gluing to prevent. In gluing plants with spinner roll arises while the Problem is that the spinner roll the glue on the block back blurred to the rear, even if the film on the roller scraped has been. It can only be a setting of the glue on the block back with exact limitation. An exact settling of the glue film can not. If at the bottom of the block Part should be without glue, the transport foot must progress respectively. The glue is then applied to the head until the end.

Of the Use of these glues in smaller perfect binders, which and originating or intermittent transport system leads to the fact that the available space is not used becomes. The processing stations lying behind each other in the processing sequence Milling cutters and gluing units must be at a distance in the transport system to be ordered. They are due to space directly behind each other arranged, the transport stroke must be correspondingly large, which either leads to a high overflow speed or leads to power reduction.

It The problem often arises with these conventional gluing units that incorporation of the outer leaves on the front and the back is not optimal. The intrusion of the glue in the structure of the dorsal surface is achieved by the dynamic pressure between roller and block. On the edge of Block back can build but no back pressure. He flows laterally, causing intensive wetting of the outer Leaves is not guaranteed.

you trying to minimize the problem by using wire-like guides side of the block back directly on the glue roller the glue prevent lateral deflection and the leaf edges outside be wetted. These guides make it very difficult Handling of gluing unit and are used in the future reluctantly.

For gluing at standstill of the product Glue plants have become known in which an across the format reaching glue roller is moved transversely to the back. This type of gluing is known as fan gluing. The blocks are transported with a large free notice in a retaining clip. The bill of the block is bent one after the other to the left and to the right, so that the back of the block fanning, and the glue roller is moved back and forth with contact to the block back under this once. The bend of the Blockaushangs is in each case in the direction of the roll movement. The gluing is usually done with dispersion glue of low viscosity. Due to the fan, the leaf edges receive a minimal lateral gluing, which increases the pull-out strength of the leaves, but naturally leads to a thickening of the block spine through all the side glue layers. This back pitch is only beneficial in manual book making. In industrial production, the back pitch of the following machines leads to Verar beitungsproblemen.

The patents EP 1 178 890 B1 and EP 1 329 334 B1 show suggestions for the design of a gluing unit for Fächerklebebindung.

The Object of this invention is to provide a gluing unit, the Use in perfect binders with reciprocating or intermittent Transport system for optimal utilization of the available Length contributes and that without generating a strong Back pitch also when using hot melt adhesives good glue penetration and thus good tear resistance of the Leaves reached.

The The object is achieved by a Gluework that on the stationary block one across the back the block performs gluing movement. there there is a forward stroke for pre-gluing and a return stroke for the finished gluing. The glue roller passes through the block spine at different distances. She is just below the start Block or even in direct contact, on the return stroke has a thicker, the larger the distance ultimately the glue layer should be on the block back.

The Peripheral speed of the glue roller is in the first approximation equal to the lateral movement speed of the gluing unit, so that the roller rolls off on the block back to a certain extent. The Rotary movement of the glue roller is directly over the side Leimwerkshub preferably generated by mechanical means. At the Changing from the previous stroke to the return stroke is done automatically a reversal of the direction of the glue roller. But it can also be a servo drive be used advantageously.

The Glue layer thickness on the glue roller is used for forward stroke and Return stroke controlled separately by separated at the roller Opposite attached glue scraper. The Anstellmaß the Glue scraper determines the layer thickness. For the forward stroke is the layer thickness lower, larger for the return stroke. The layer thickness on the glue roller must be more than twice as thick like the desired glue application on the block back be.

At least one of the two scraper glue scraper is aired when he is not active, so that generated by the active scraper Glue film on the glue roller can happen if not through contact is removed with the block back. That has at the same time the advantage that local blockages between scraper and roll are rinsed free. Switching the glue scraper is done by reversing the Leimwerkshubs preferably by pneumatic means.

At the Forward stroke is the roller directly under the block back or even slightly presses against him. This is the glue pressed into the structure of the block spine and the back of the back wetted with glue. At the Return stroke of the glue rollers have these a larger one adjustable distance to the block back. It can do that be assumed that the glue remaining on the back About half the distance between the block back and roll top is. The return stroke thus ensures a certain glue layer thickness, which in the processing of hotmelt is important. To the different distance of the glue roller to have the block back, the gluing unit is at stroke direction reversal in height by mechanical or pneumatic means adjusted.

Around at the block back edges a glue application slightly around the Back edges can reach around the normal synchronous Rolling movement of the glue rollers an additional rotary motion superimposed be, each at the point of contact of the roller with the Block back a relative circumferential movement of the roller against generates the lateral lifting movement, causing the glue on the edge of the block spine is paddled against this and wetting around the edge he follows. It avoids that when opening the finished blocks between the outer leaves and the block a narrow gap is formed, the glue film on the block back Seen from the inside.

If the glue roller leaves the block back during the return stroke, may be at the block edge edge of a glue nose or drooping drops form. This additional glue could be added later Squeeze out pressing and possibly result in contamination.

By a scraper whose cutting edge is parallel to the glue roller in the return stroke direction located behind the glue roller and arranged in height so is that they are slightly below the return stroke the desired glue film passes your back, drooling drops or glue noses are cut off.

The Basin of Glue Plant is always at an optimal level with glue filled. Appropriately, the Refill automatically in a known manner. This will be done in also known manner, the current glue level queried and If necessary, a refill signal given.

Around to receive unprimed areas at the head and foot of the block Can on the roll scrapers slidably narrow additional Scrapers are attached for the forward stroke and return stroke completely scrape off the glue on the roller.

The present invention also provides the Possibility to apply the glue in strips by exchanging the continuous, normally used roller scrapers with those which have recesses in the desired places along their length.

1 Glue plant on average

2 Glue plant in the top view

3 Gluing function in the forward stroke

4 Gluing function in the return stroke

5 Gluing without additional rotation of the glue roller

6 Gluing with additional rotation of the glue roller

A exemplary embodiment of the invention is below described.

As 1 shows a block B in an intermittently running transport system with the brackets 1 transported with the notice a of the block spine from the bracket and above the gluing unit 2 brought to a standstill.

The glue plant 2 is now moved by not shown known mechanical-electrical or pneumatic means to the stroke h1 under the block.

The glue plant 2 consists essentially of the housing 3 in that it contains a glue supply and that, when hotmelt is used, the glue roller is heatable 4 and the scrapers 5 . 6 and 7 , The housing is above the pneumatic cylinder 7 that make the vertical stroke h2 on the guide 8th stored. The guide glides on the guide rods 9 around the horizontal stroke h1 back and forth. The guides are attached to the frame G.

The roller 4 gets over the gear 10 whose pitch corresponds to the roll diameter, via the intermediate 11 that against a rack 12 runs offset by the lifting movement itself in a rotational movement, so that the roller rolls on the block back. The rack 12 is about a pneumatic cylinder 13 attached to the frame.

A movement of the pneumatic cylinder 13 generates an additional rotational movement of the glue roller, in size and direction over the stroke direction and stroke speed of the cylinder 13 can be determined and generates a relative movement of the roll circumference to the block back.

As in 3 The scraper is shown generated 5 a glue film of thickness d1 on the glue roller during the forward stroke. The distance of the roller to the block back is small g1. The cylinders 7 have the case 3 raised. During the pre-stroke, the glue is pressed into the structure of the block back surface. Unused glue can pass through the gap d2 between scraper 6 and glue roller pass. The distance scraper 5 to glue roller is by stop screw 14 limited. Against them becomes the lever 15 who the scraper 5 around the axis 5a pans, through the cylinder 16 pressed.

As in 4 The scraper is shown generated 6 with the distance d2 to the glue roller the glue film for the return stroke. The distance g2 of the glue roller to the block back is large. The cylinders 7 have the case 3 lowered. It is a desired thick glue film applied to the block back. The scraper 5 has swung up during the return stroke to let through unequipped glue. The distance to the glue roller d3 is greater than the distance d2.

The scraper 5 has another function. It does not serve to produce glue film thickness on the roller, but it moves with the cutting edge by the amount d4 deeper than the block back during the return stroke h1 and cuts off drooping glue beads. The dimension d4 is adjustable via the stop screw 17 , which at the same time the opening dimension d3 of the scraper 5 certainly.

Switching of cylinders 7 and the cylinder 16 always takes place when changing the stroke direction.

5 and 6 show the difference between the pure rolling motion and a relative movement. In the pure rolling movement according to 5 A flat glue film is created without the certainty that glue is around the block edges. 6 shows that with a slight relative increase in the peripheral speed of the roller in the forward stroke by operating the cylinder 13 a Leimwulst around the Blockrückenkante arises around.

When using the gluing unit for hotmelt, the housing becomes 3 through a heating cartridge 3a heated. For good thermal conductivity, the housing is made of aluminum. As in 3 shown is the heated area of the housing radiused around the glue roller 4 formed around a shortest possible way of heat transfer through the poorly conductive glue and thus the fastest possible heating of the not directly heated roller 4 to obtain.

The Level control of gluing unit is done in a known manner.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1178890 B1 [0010]
• - EP 1329334 B1 [0010]

Claims (9)

Leimwerk for an adhesive binder with reciprocating or intermittent running transport, characterized in that the gluing is done at standstill the product by a transversely moving to the block back and lying parallel to the block back glue roller and that the glue roller to under the block back through a forward stroke and a return stroke is moved. Gluing unit according to claim 1, characterized in that the roller 4 during the pre-stroke with a small distance g1 and g2 on the return stroke with a greater distance passes under the back and that this change in distance is generated by mechanical or pneumatic means that raise the housing to adjustable dimensions and lower, the switching of the height automatically at the stroke direction reversal lateral stroke h1 takes place Gluing unit according to claims 1 and 2, characterized in that the rotational movement of the glue roller 4 by the lifting movement h1 by mechanical means 10 . 11 . 12 . 13 takes place, and is tuned so that the peripheral speed of the glue roller is equal to the lateral lifting speed and thereby results in a rolling motion. Gluing unit according to claims 1 to 3, characterized in that via pneumatic means 13 . 12 the rolling movement an additional relative movement of the peripheral surface of the glue roller 4 is superimposed. Gluing unit according to claims 1 and 2, characterized in that the glue layer thicknesses on the glue roller for the preliminary stroke by the adjustable scraper 5 and for the return stroke through the adjustable scraper 6 be generated, the scraper 5 for the return stroke. Gluing unit according to claims 1 and 2, characterized in that on the return stroke an additional adjustable distance to the block back scraper 7 drooping glue drops off the block spine Gluing unit according to claims 1 and 2 characterized characterized in that the rotational movement of the glue roller by a Servo drive takes place, with the adjustment of the peripheral speed the roller to the lateral movement speed of the gluing unit according to the circumstances and desired Effects programmable can be tuned Gluing unit according to claims 1 and 2, characterized in that in the region of the head and foot of the block can be scraped by scraper glue strips on the glue roller, so that unelimited areas at the ends of the block arise, and that these scrapers along the scraper 5 and 6 are adjustable to the desired position and are arranged displaceably on this. Gluing unit according to claims 1 and 2, characterized in that the scrapers 5 and 6 have recesses of defined depth along the length where glue lines are desired on the block spine and that these profiled scrapers are interchangeable with the straight scrapers.