JPH06191721A - Buckle folding machine - Google Patents

Abstract

PURPOSE: To guarantee the carriage of a section traveling through the entire folding machine without troubles and excellent folding quality by adopting the clearance of the entrance gap of a fold pocket to the thickness of the advancing section every time even in the case of executing folding work to the sections of remarkably different thickness. CONSTITUTION: At least one of upper and lower limiting elements 13 and 15 in a tongue-like shape and/or a line piece shape for forming the entrance gap 14 of the fold pocket is moved by the operation members 31 and 32 of a pair of turning levers 22 and 23 so as to enlarge the entrance gap 14. Then, the pair of the turning levers 22 and 23 supports the fold rollers W2 and W3 capable of turning motion of a roller set for forming a pull-in nip part E or a folding nip part F1 positioned immediately before the fold pocket 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of feed rollers and / or fold rollers which can be adjusted to different folding nip gaps and / or can be swung relative to each other by a spring action, and at least one fold pocket. Each of the feed rollers and / or the fold rollers is rotatably supported by a pair of two-arm swivel levers, and cooperates with another roller to form a drawing nip portion or a folding nip portion. The invention relates to a buckle folding machine of the type described, in which the inlet gap of the fold pocket has a minimum clearance and is elastically variable depending on the signature thickness.

[0002]

2. Description of the Prior Art Buckle folding machines of the type described above require that the fold pockets be guided as closely as possible in the region of the inlet gap of each fold pocket in order to form the correct folding edge on the fold pocket. It is necessary not to obstruct the signature entry into the interior. In the case of folding individual sheets that pass through the individual folding nips and the fold pockets in sequence, the inlet gap of the individual fold pockets is approximately 4 to 6 times that of a single signature sheet. By adjusting the minimum gap corresponding to double the thickness, it is possible to meet the requirements relatively easily. However, when using a buckle folding machine to simultaneously fold multiple overlapping sheets, that is, a laminated sheet, with a total thickness above the normal gap of the inlet gap, the inlet gap It is necessary to variably configure the gap. One of the upper and lower limiting elements forming the inlet gap is elastically movably supported,
It has already been proposed that a signature having a thickness exceeding the minimum gap of the entrance gap can be retracted when entering the signature. However, what has been found in practice is that this known solution cannot be used for all types of paper and for markedly different signature thicknesses. This is because the known means cannot avoid the occurrence of troubles, especially when the signature thickness is very large and in the case of relatively thin papers that are stacked in multiple layers.

Buckle folding machines of the type mentioned at the outset are known per se, which have fold rollers whose inlet gap can be adjusted variably (Swiss patent 390287 and German utility model no. 9203930.8). However, in the fold pocket of the known buckle folding machine, no movable restricting element is provided on the inlet side of the fold pocket, which entry gap can already be changed.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to improve a buckle folding machine of the type mentioned at the outset so that even when folding signatures of significantly different thickness, folding pockets are introduced. The gap of the gap,
By adjusting the thickness of the signature to be entered each time, it is necessary to ensure the transportation of the signature that can pass through the entire folding machine without trouble and good fold quality.

[0005]

SUMMARY OF THE INVENTION In order to achieve the object, the inventive means comprises at least upper and lower tongue-shaped and / or strip-shaped restriction elements forming an inlet gap of a fold pocket. One of the roller sets is movable by an actuating member of a swivel lever pair to widen the inlet gap, the swivel lever pair forming a pull-in or folding nip located immediately in front of the fold pocket. The point is that it supports a fold roller capable of turning.

[0006]

When a relatively thick signature is folded on the basis of the above-mentioned constitution means of the present invention, about 4 times as much as a normal sheet is processed.
Starting from the always existing minimum gap corresponding to double to six times the thickness, the gap in the inlet gap of each fold pocket is enlarged in each case and folded into the fold pocket until the stopper of the fold pocket is reached. Is ensured without trouble, and at the same time, in the area of the inlet gap of the fold pocket, the guide of the signature necessary for precisely forming the desired folding edge or fold is guaranteed. ing. It is particularly advantageous in that case that the gap value of the inlet gap is automatically increased in relation to the respective signature thickness to be machined.

On the basis of the construction means according to the invention as defined in claim 2, the expansion of the pull-in or folding nip, which is located in front of the fold pocket in each case, increases the entrance gap of the fold pocket. It is possible to obtain a proportional increase. This functional system is extremely important in terms of functioning in order to correctly enter the signature into the fold pocket without trouble, especially when the signature bundle is extremely thick, and is combined with the constituent means described in claim 4. Is advantageous. That is, according to the structure described in claim 4, when the signature thickness is small, the minimum entrance gap is maintained and is not expanded.

According to the third aspect of the present invention, the collision angle of the signature with respect to the guide strip is more preferable in the case of a relatively large signature thickness, so that the signature is folded when the signature enters the fold pocket. Bending is also reduced.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

The illustrated first fold pocket 1 comprises a number of grid members 2 and 3 which are vertically offset from one another and which are connected to each other by cross members 4 and 5, respectively. One upper grid 6 and one lower grid 7 are formed, and an entrance slit 8 is formed between the upper and lower grids. The upper grid 6 composed of a plurality of grid members 2 as a whole is cross member 4
Although it is possible to swing upward in the opening direction about the axis line of the above, it normally remains in the functional position shown in FIGS. 1 and 3 to 5 due to its own weight or by the lock mechanism. The lower grid 7 composed of a plurality of grid members 3 can be turned downward within a certain limit range about the axis of the cross member 5.

An angle strip 10 is attached to a laterally extending chevron 9 which is fixedly welded and rests on the end section of the grid 2 which forms the upper grid 6 near the entrance. Fixed, the angle strip has a strip bending section 11 bent at a right angle to the plane of the entrance slit 8, in which the strip bending section extends obliquely upwards with respect to the plane of the entrance slit 8. A plurality of guide tongue-shaped pieces 12 that are bent and extend in a hook shape are integrally formed, and the arcuate connecting section 13 of the guide tongue-shaped pieces is inserted into the strip bending section 11 into the first fold pocket 1. It forms the upper limiting element for the gap 14. The lower limiting element of the entry gap 14 consists of a flat leg 15 of an angled strip 16 extending parallel to the plane of the entry slit 8, said angled strip 16 being a grid of the lower grid 7 of the first fold pocket 1. It is connected to the material 3 and is arranged so that the grid material 3 accurately positions the upper surface of the associated flat leg piece 15 in a plane that limits the lower limit of the entry slit 8. On both side ends of the flat leg piece 15 of the chevron strip 16, the circular spacer block 1 is provided outside the entrance width.
7 is arranged on the circular spacer block,
Strip bending section 11 of upper angle strip 10
The entry gap 14 always has a minimum clearance b corresponding to the height of the circular spacer block 17, which is approximately 1 mm, since the arcuate coupling section 13 of FIG.

The chevron strip 16 is limited in its upward movement by two setscrews 18, one on each side end section, and is supported by a compression coil spring 20. In this case, the set screw 18 is screwed into the stationary bottom strip 19 and passes through the corresponding hole of the flat leg piece 15, and the compression coil spring 20 concentrically surrounds the set screw 18, Since the lower end of the compression coil spring is supported on the upper surface of the bottom strip member 19 and the upper end thereof is supported on the lower surface of the flat leg piece 15, the flat leg piece 15 is constantly supported by the screw head 18 'located thereabove. It is crimped.

As can be seen from the drawings, the flat leg pieces 15 of the chevron strip 16 are also the guide tongue pieces 12 of the angle strip 10.
Both feed roller W1 and second fold roller W
It has penetrated into the space between 3 and. The second fold roller W3 cooperates with the first fold roller W2 to make the first fold roller W3.
While the folding nip portion F1 is formed, the feed roller W1 forms the pull-in nip portion E together with the first fold roller W2. In FIG. 4, a second fold roller W3 is provided with a third fold roller W4, which cooperates with the second fold roller to form a second folding nip F2. is doing. A second fold pocket (not shown) into which a signature passing through the first fold nip F1 can enter the second fold nip F2 is similar to the first fold pocket 1. In front of.

The feed roller W1 is supported on a stationary shaft 21. On the other hand, the first and second fold rollers W2, W3 are rotatably supported by two-arm swivel lever pairs 22, 23, respectively, and the swivel lever pair itself has a swivel axis 24, 25 as its center. And is actuated by tension springs 26, 27, which make the first fold roller W2 a stationary feed roller W1 and the second fold roller W3 a first fold roller W3.
Is crimped to the fold roller W2. Swing lever pair 2
2 and 23, first and second fold rollers W2, W
Each lever arm 22 ', 23' carrying 3 has a finger-like extension 28, 29 respectively, each finger-like extension being omitted from the inlet gap 14 of the first fold pocket 1 shown or not shown. Which is oriented towards the inlet gap of the second folded pocket, which is acted on by the pin-shaped actuating members 30, 31 against the end of the flat leg 15 of the chevron strip 16, which action results in FIG. The end of the flat leg piece is separated from the guide tongue piece 12 or the arcuate connecting section 13 which is stationary by the weight of the upper grid 6 or locally secured by the locking mechanism as shown in FIG. The opening of the inlet gap 14 will be enlarged.

The opening of the inlet gap 14 is not enlarged each time the signature passes through the pull-in nip E, but the signature passing through the pull-in nip E is the smallest in the inlet gap 14. The pin-shaped actuating member 30 of the swivel lever pair 22, in the inactive position of the swivel lever pair 22, allows the flat bar of the chevron strip 16 to be carried out only if it has a thickness greater than the gap b. It is arranged so as to have a distance a from the upper surface of the leg piece 15 that corresponds to approximately the minimum gap b of the inlet gap 14 (see FIG. 5). Equivalent items are the flat leg pieces 1 of the chevron strips 16 of the second fold pockets (not shown) placed behind the first folding nip F1.
The same applies to the arrangement of the pin-shaped actuating member 31 with respect to 5.

The pin-shaped actuating members 30, 31 have a larger distance from the swivel axes 24, 25 of the swiveling lever pairs 22, 23 than the bearing axes 32, 33 of the two fold rollers W2, W3. Members 30, 31
Makes a larger turning stroke at the same turning angle when the turning lever pair 22, 23 swings, so that the inlet gap 1
4 is opened proportionally after overcoming the empty stroke corresponding to the distance a. This has not been fixed and the entrance gap 1
It means that the opening 4 is always somewhat larger than the value corresponding to the thickness of the signature passing through the pull-in nip E or the folding nip F1.

Although it is possible in principle to move the upper limiting element instead of the lower limiting element of the inlet gap 14, ie the flat leg piece 15, the advantages achieved by the embodiment described above are firstly Yamagata strip 1
6 movement is obtained directly and without the need for any other transmission member to change the direction of movement, and secondly it provides a more favorable impact or entry angle into the fold pocket, As a result, the signature is less likely to bend when entering the fold pocket.

This impact angle is illustrated by the arrow 34 in FIGS.

In FIGS. 1 and 3, the flat leg 1 of the bar 16 forming the lower limiting element of the inlet gap 14 is shown.
5 still occupies the dead position, and the inlet gap 1
4 has its minimum gap b. On the other hand, FIG. 4 illustrates a state in which a relatively thick portion of the signature bundle or the stratified signature shown by the arrow 35 just passes through the pull-in nip portion E. In this case, the signature bundle or the stratified signature is shown. The first fold roller W2 is pivoted downward by the tab so that both pin-shaped actuating members 30 of the finger-shaped extension portion 28 are rotated.
Pushes the flat legs 15 together with the two spacer blocks 17 away from the guide tongue 12 or the arcuate connecting section 13, so that the inlet gap 14 has a larger clearance.

When a plurality of fold pockets are provided, as is the case in most cases, the inlet gap 14 of the fold pockets is of the same type as described above, and comprises a folding roller capable of pivoting the folding nip. It can be enlarged by a pair of turning levers, each of which is supported forward. In that case, the inlet gap is necessarily enlarged in proportion to the signature thickness, which gradually increases from one folding nip to the next.

The functional principle on which the present invention is based is that the signature thickness is measured each time, and the required gap gaps are respectively provided in the pull-in nip E and the subsequent folding nips F1, F2 ... In accordance with the measured value. Can also be used in the case of a buckle folding machine having an automatic adjusting device for adjusting the pair of swiveling levers of the fold roller.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first fold pocket shown with a pair of fold rollers and a feed roller.

FIG. 2 is a partial plan view of an upper surface of a first fold pocket.

FIG. 3 shows the first fold roller and the lower limiting element of the fold pocket inlet gap shown in FIG.
FIG. 6 is a partially enlarged cross-sectional view showing two functional positions.

4 is a partial enlarged cross-sectional view of the first fold roller shown in FIG. 1 and the lower limiting element of the inlet gap of the fold pocket in a functional position different from that of FIG.

FIG. 5 is a partial detailed view of FIG.

[Explanation of symbols]

1 1st fold pocket, 2,3 grid material, 4,5 horizontal material, 6 upper grid, 7
Lower grid, 8 entry slits, 9 chevron strips, 10 angle strips, 11 strip bending sections, 12 guide tongues, 13 arcuate coupling sections, 14 inlet gaps, 15 flat legs, 16 chevron strips, 17 circular spacers Blocks, 18 set screws, 18 'screw heads, 19 stationary bottom strips, 20 compression coil springs, 21 stationary shafts, 22,23 two-arm swivel lever pairs, 22', 23 'leverage arms, 24,
25 pivot axis, 26, 27 tension spring, 2
8, 29 Finger-like extension, 30, 31 Pin-like actuating member, 32, 33 Bearing axis, 34 Arrow indicating collision angle, 35 Arrow indicating relatively thick signature stack or stacked signature, a distance, b Minimum Gap, W1 feed roller, W2 first fold roller, W3 second fold roller,
W4 Third fold roller, E Pull-in nip portion, F1 First folding nip portion, F2 Second
Folding nip part

Claims (4)

[Claims] 1. A two-arm type fold roller having a plurality of fold rollers which can be adjusted to different folding nip gaps and can be pivoted relative to each other by a spring action, and at least one fold pocket. Each of which is rotatably supported by the pair of swiveling levers, forms a pull-in nip portion or a folding nip portion together with another roller, and has an inlet gap of the fold pocket having a minimum gap. In a buckle folding machine of the type that is elastically variable depending on the folded signature, the inlet gap (14) of the fold pocket (1)
At least one of the upper and lower tongue-shaped and / or strip-shaped limiting elements (13, 15) forming the swivel lever pair (22,
23) movable by the operating members (31, 32) of
The pair of swiveling levers (22, 23) can swivel the roller set forming the pull-in nip (E) or the folding nip (F1, F2) located immediately before the fold pocket (1). A buckle folding machine characterized by supporting fold rollers (W2, W3). 2. A fold roller (W capable of rotating)
2, W3) supporting swivel lever pair (22, 23)
The lever arms (22 ', 23') of the inlet gap (14)
2. Buckle folding machine according to claim 1, characterized in that it has finger-like extensions (28, 29) which act directly on the movable restriction element (15). 3. Finger-like extensions (28, 29) of the lever arms (22 ', 23') act on a lower limiting element (15) configured as a flat guide strip, The distance from the upper limit element (13) is such that the drawing nip (E) or the folding nip (F1, F
The buckle folding machine according to claim 1 or 2, wherein the buckle folding machine expands each time when the nip gap of 2) is expanded. 4. A specific distance from the limiting element (15) in its inactive position, in which the actuating member (30) acting on the limiting element (15) of the inlet gap (14) is overcome by the idle stroke of the initial adjustment. The buckle folding machine according to claim 1, further comprising (a), wherein the specific distance corresponds to a predetermined signature thickness.