Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Reexamination Certificate
1999-10-13
2001-12-18
Kim, Eugene (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
C493S426000, C493S476000
Reexamination Certificate
active
06331154
ABSTRACT:
SUMMARY OF THE INVENTION
Field of the Invention
This invention relates to a pin action timing adjustment device of a folding device. More specifically, it relates to a device which adjusts the timing of pins and blades that hold and release paper folded on the circumferential surface of a folding cylinder, in a folding cylinder comprising plural pin mechanisms and an identical number of folding blade mechanisms.
In particular, it relates to a pin action timing adjustment device of a folding device wherein the operating mode can be changed over between straight run and collect run.
BACKGROUND OF THE INVENTION
Folding devices of rotary presses which print, cut and fold printing web, for example, can fold paper in two folding modes, i.e., straight run or collect run.
The printing web, which is transported between a folding cylinder and cutting cylinder that rotate via a pair of nipping rollers, is cut to a desired length, and is thereby made into cut printed product.
The non-printing area of the paper slightly upstream from the cutting position is pierced by and held by pins which extend from the folding cylinder surface, and is progressively wound onto the fixed circumferential surface part of the folding cylinder due to the rotation of the folding cylinder. The folding cylinder undergoes an angular displacement by a predetermined angle, and whenever the approximate middle part of the wound, cut printed product reaches the nearest position to the downstream adjacent cylinder (jaw cylinder), folding blades project from the folding cylinder circumferential surface, push up the approximate middle part (the fold) of the cut printed product, and transfer it to a jaw mechanism provided on the circumferential surface of an adjacent cylinder (jaw cylinder) situated facing the folding blades (straight run).
Alternatively, the folding blades project from the folding cylinder circumferential surface, push up the approximate midpart (the fold) of the cut printed product, and transfer it to the jaw mechanism provided on the circumferential surface of the downstream adjacent cylinder (jaw cylinder) facing the folding blades on every other occasion when the approximate middle part of the cut printed product reaches the aforesaid nearest position (collect run). At the time of this transfer, the pins which held the leading edge of this cut printed product fall away from the circumferential surface of the folding cylinder circumferential surface, releasing the cut printed product.
However, in either of the above folding modes, if the timing with which the pins released the cut printed product was too early, the cut printed product was not fully advanced, and it creased or crumpled when it was transferred. Moreover, the position of the fold in the cut printed product could not be maintained constant.
Conversely, if the timing with which the pins released the cut printed product was too late, as the cut printed product was restrained by the pins, the pin holes in the cut printed product were enlarged and the paper tore.
The grip on the cut printed product by the jaw mechanism of the adjacent cylinder (jaw cylinder) was then inadequate, causing the paper to slip so that it was not transferred properly.
In order to prevent such problems, a device is needed to adjust the timing of the pins falling from the folding cylinder circumferential surface relative to the rising of the folding blades from the circumferential surface of the folding cylinder. Such a device is disclosed for example in Japanese Patent Publication No.46-10123 (Koho) and Japanese Patent Publication No.7-29726 (Koho).
In the timing adjustment of the projection of the folding blades and falling of the pins shown in Japanese Patent Publication No.46-10123 (Koho), engaging parts of helical gears are provided in the drive path of a pin action cam. One of these engaged helical gears is free to displace parallel to a rotating shaft, and the adjustment is performed by displacing this gear.
The pin action cam has the same rotation center as the rotation center of the folding cylinder, and has the same drive source as that of the folding cylinder. The pin action may be changed over between straight run and collect run by selectively changing over so that rotation is performed at either one of two predetermined rotation speed ratios relative to the rotation of the folding cylinder.
A cam follower is provided free to rotate via a cam follower shaft at the free end of an arm installed at the end of a pin action shaft parallel to the axis of the folding cylinder in the folding cylinder, and is made to come into contact with a cam surface of the aforesaid pin action cam.
The pin action cam rotates together with the rotation of the folding cylinder with a selected rotational speed ratio, and due to the displacement of the cam follower depending on this pin action cam, the pin action shaft displaces back and forth so that the pins attached to the cam action shaft rise and set on the circumferential surface of the folding cylinder.
As the folding cylinder rotates, the folding blades then either project from the circumferential surface of the folding cylinder on each occasion (straight run) or project from the circumferential surface of the folding cylinder on every other occasion (collect run) that the folding cylinder reaches a predetermined rotation phase.
However, the change-over of this projection operation is performed independently of the change-over of rotation speed ratio of the pin action cam (change-over between straight run and collect run of the pin action).
Specifically, this folding device comprises a mechanism which enables it to change the rotation phase of the driven side relative to the rotation of the drive side using the torsion angle of the teeth of the helical gear in the drive path for driving the rotation of the pin action cam. By controlling this mechanism, the rotation phase of the pin action cam is changed relative to the rotation of the folding cylinder having the same drive source, and the timing with which the pins fall from the circumferential surface of the folding cylinder relative to the projection of the folding blades, which project from the circumferential surface of the folding cylinder with a desired timing relative to the rotation of the folding cylinder, is adjusted.
Next, the timing adjustment with which the pins fall relative to the projection of the folding blades disclosed in Japanese Patent Laid-Open Hei 7-29726 (Koho), is made by providing a change-over mechanism in the drive path of the pin action cam. This mechanism, which changes over between stop and rotation of the pin action cam by connecting or disconnecting the drive path, comprises a helical gear which transmits the rotation of the drive source downstream when the drive path is connected and stops in a fixed state when the drive path is disconnected. A helical gear which engages with this helical gear is provided downstream in the drive path of the pin action cam such that it is free to displace parallel to its rotation axis. By displacing this gear, the pin action cam which is in the stop state can be made to undergo an angular displacement to change its phase, or the rotation phase of the driven side relative to the rotation of the drive side can be changed using the torsion angle of the teeth of the helical gear.
A pin action cam, which has the same rotation center as the rotation center of the folding cylinder and has the same drive source as the folding cylinder, can change over between straight run and collect run by selectively changing over between stop with a predetermined rotation phase, and rotation under a predetermined rotation speed ratio relative to the rotation of the folding cylinder.
A pin cam follower is installed free to rotate via a cam follower shaft at the free end of an arm provided on the end of the pin cam shaft parallel to the axis of the folding cylinder in the folding cylinder, and is brought into contact with the cam surface of the aforesaid pin action cam. Due to the displacement of the pin cam follower due to the
Nakajima Tomonari
Shibuya Kazuaki
Suzuki Seiji
Greenblum & Bernstein P.L.C.
Kim Eugene
Tokyo Kikai Seisakusho Ltd.
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