JPS5842336Y2 - Paper feed safety device in printing presses - Google Patents

Description

[Detailed description of the invention] The present invention is a paper feed safety device for a printing press that removes foreign objects from the printing paper from the paper feeder to the printing unit, and stops the paper feed by detecting this. It is related to.

A sheet-fed printing machine consists of a paper feeding device that feeds printing paper (hereinafter referred to as paper) loaded on a paper stack one by one, a printing unit that prints on the fed paper, and a printing unit that prints on the paper that has been fed and loaded. and a paper ejection device that ejects the paper onto a paper stacking table.

The sucker device in the paper feeder that separates and feeds out the paper one by one is equipped with blowers and suction ports, and these move vigorously each time the paper is fed out, so maintenance is required. If there is a problem with inspection, there is a risk that small parts such as snap rings may come off due to vibration.

When it comes off, it falls onto the paper traveling below, and is carried to the printing unit on the paper, where it gets caught between the blanket cylinder and the impression cylinder where printing pressure is being applied, so the blanket cylinder Not only does the scale leave scratches on the blanket, but there is also the risk of small objects getting stuck in the impression cylinder, which could lead to a major accident, making printing work impossible.

This idea was created in consideration of the above points.

A magnetic material supported by a swinging body and extending in the width direction of the paper, and an electric contact that closes in conjunction with the swinging of the swinging body are provided in the paper feed path between the sucker device and the swing device, and small objects are By attracting and removing foreign objects using a magnetic material, and by closing the electrical contact and stopping the paper feeding operation when larger foreign objects pass through, damage to the printing cylinder caused by foreign objects being sent to the printing section can be prevented. The present invention provides a paper feed safety device for a printing press configured to prevent such problems.

Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

This embodiment shows an example in which the present invention is applied to a single-color sheet-fed printing press.
The figure is a side view of the paper feed path, FIG. 3 is a side view of the paper feed safety device, and FIG. 4 is a front view.

In these figures, a printing press 1 includes a paper feeding device 2, a printing unit 3, and a paper discharging device 4.

The paper feeding device 2 is provided with a paper stacking table 6 for stacking papers 5, a sucker device 1 for suctioning and feeding out the papers 5 one by one from the upper layer, and a sucker device 7. is equipped with a first suction port 8 that sucks the paper 5, a blower foot 9 that blows air under the suctioned paper 5 to improve separation, and a second suction port 10 that sucks the paper and sends it forward. ing.

In addition, the printing unit 3 includes a printing cylinder group consisting of a plate cylinder 11, a blanket cylinder 12, and an impression cylinder 13, an inking device 14 that supplies ink to the plate on the plate cylinder 11, and a water supply device that also supplies water. 15 are provided.

Additionally, a swing device 16 is attached diagonally above the impression cylinder 13 to deliver the paper 5 sent from the paper feeder 2 to the impression cylinder 13.

Further, a paper ejection chain 17 having a plurality of paper ejection claws is stretched over the paper ejection device 4, and the paper 5 released from the paper ejection claws is stacked below the terminal end of the paper ejection chain 17. A paper stacking stand 18 is provided.

A paper feed path 1 shown in FIG.
9 is formed.

That is, at the starting end of the paper feed path 19, a paper feed roller 20 and a tape roller 21, which catch the leading edge of the paper 5 sucked and carried by the second suction port 10 of the sucker device 1 and send it out, are arranged above and below. In addition, in front of the tape roller 21 and in front of the swing device 16, there is a front tape roller 22.
is provided.

A plurality of paper feed tapes 2 are provided between both tape rollers 21 and 22 and tension rollers 23 and 24.
5 is stretched in an inverted triangular shape, slanting downward toward the front.

Furthermore, support arms 26 extend from both sides of the tape roller 21 to the front of the tape roller 22, and on the support arms 26 on both sides, feeder boards 2γ extending over the entire width of the rollers 21 and 22 are installed. It is installed with its upper surface attached to the back surface of the paper feed tape 25.

In addition, in front of the tape roller 21, a difference plate 28 having the same width as the feeder board 27 is supported by a bracket 29 attached to the support arm 26, and the feeder board 21 is supported by a bracket 29 attached to the support arm 26.
It is constructed so that it extends to

Further, a front abutment shaft 30 is rotatably supported and buttoned below the front end of the difference plate 28, and the front abutment shaft 30 has a plurality of front abutments 31 formed in an L-shape. , are arranged in parallel with their upper ends inserted into the notches of the difference plate 28.

On the support arms 26 on both sides, a pair of left and right brackets 32 are erected at the tip of the feeder board 27, and at the same position on the lower part of each bracket 32 is a lever shaft. 33 connects both ends to the bracket 32
It is rotatably supported by a shaft that protrudes from the base.

An arm 34 as a swinging body is fixed to the inner protruding part of the lever shaft 33 by a pin 35 with its front end inclined so that it faces above the difference plate 28. A flat magnet material 3T extending over the entire width of the difference plate 28 is screwed to a light metal angle material 36 supported by the section.

Furthermore, one of the lever shafts 33 on both sides
3 is regulated from moving in the axial direction by a collar (not shown) that is pivotally attached to the outer protrusion. Also, on the outer protrusion of the other lever shaft 33, an adjustment lever 38 is regulated by a pin 39. It is fixed and extends approximately vertically along the bracket 32.

At the upper end of this adjustment lever 38, there is a bracket.
A threaded end portion of an adjustment housing 40, which is rotatable and held in a sliding die, is screwed into the receiving member 32a fixed to the receiving member 32a, and by rotating the adjustment housing 40, the adjustment lever 38i - and the magnet material 37 and the difference plate 2 via the arm 34.
The structure is such that the gap with 8 can be adjusted.

In addition, the weight of the adjustment knob 40, magnet material 31, and other components always pushes it toward the front.

On the other hand, a magnetic switch 43 equipped with electric contacts 41 and 42 that protrudes upward is attached to the bracket 32 and is pressed, and when the electric contacts 41 and 42 are closed, a connection is made with a lead wire 44. The paper feeding device 2 is configured such that the paper feeding operation stops when the paper feeding device 2 is stopped.

The head of a synthetic resin pin 44 as an insulating material screwed into the tip of the adjustment knob 40 is rotatably inserted into the tip of one of the electrical contacts.
4 is slidably penetrated by the other electrical contact 42.

Therefore, the electrical contacts 41 and 42 are always open.
The adjustment lever 38 is then closed by rotating clockwise in FIG.

These conditions are shown in Figures 3 and 3C.

When the printing machine 1 configured as described above is turned on, the paper 5 stacked on the paper stacking table 6 is carried one by one by the sucker device γ, and its leading end is moved between the paper feed roller 20 and the tape roller 2.
Captured by 1.

As shown in FIG. 2, the captured paper 5 is fed out onto the paper feed tape 25 with its leading end and tail partially overlapping, and then the paper 5 is fed onto the paper feed tape 25 and the paper feed rollers (not shown). The feeder board 27 is held by the feeder board 27 and transferred.

The transferred paper 5 is ejected onto the difference plate 28 and the front plate 31
When the sheet comes into contact with and stops, the gripper of the swing device 16 swings to grip the end of the paper and transfers it to the gripper of the impression cylinder 13, thereby printing is performed.

In such printing operations, small parts of the sucker device may come off and fall onto the paper 5 due to the intense paper feeding movement as described above, and the operator may place mechanical operating tools etc. on the paper feeding frame. If the paper 5 is left on the feeder board 27, it may fall onto the paper 5 on the feeder board 27 due to vibration or the like.

These foreign objects of various sizes are transported on the paper 5 and reach the top of the difference plate 28.

However, since a magnet material 37 is supported by the arm 34 above the starting end of the difference plate 28, small objects such as snap rings among large and small foreign objects are removed from the magnet material 37.
The work on the box continues.

Furthermore, when a foreign object larger than the gap between the magnet material 31 and the paper 5 attempts to pass through, the arm 34 is provided with a slight inclination, so the wedge effect between the arm 34 and the difference plate 28 prevents the magnet from passing through. The material 37 is lifted and the arm 34
sways.

Therefore, the adjusting lever 38 integrated therewith swings clockwise in FIG. 3, the electric contacts 41 and 42 are closed, and the paper feeding device 2 is stopped.

After this, if the foreign object is removed, the magnet material 37 etc. will return to its old state due to its own weight, so the electrical contacts 41 and 42 will be opened.
Work can be resumed immediately.

When it is necessary to adjust the gap between the magnet material 37 and the paper 5 depending on the thickness of the paper 5, the adjustment lever 38 is swung by rotating the adjustment knob 40, and the magnet integrated therewith is rotated. The gap is adjusted by moving the material 37 up and down.

In this case, the pin 44 at the tip of the adjustment housing 40 is idling in the through hole of the electrical contacts 41, 42 and does not move in the axial direction, so it affects the gap between the electrical contacts 41, 42. do not.

In this embodiment, the magnet material 37 is formed into a flat plate shape, but a rod-shaped general-purpose permanent magnet known as rarenet, for example, may be used.

Further, the magnet material 37 may be fixed to the angle material 36 with an adhesive.

As is clear from the above description, according to the present invention, there is provided a magnetic material supported by a swinging body and extending in the width direction of the paper in a paper feed path between a sucker device and a swing device of a printing press, and a swinging body. It is equipped with an electric contact that closes or stops the paper feeding operation in conjunction with the rocking of the paper, and removes small foreign objects that fall and are transferred on the paper due to paper feeding movements or machine vibrations. By using a magnetic material to attract the foreign material, and by configuring the structure so that when a foreign material larger than the gap between the magnetic material and the paper passes, the electric contact is closed and the paper feeding operation is stopped, the size of the foreign material can be reduced.
However, since the sheet is not sent to the printing section, it is possible to prevent damage to the covering material of the blanket cylinder and the impression cylinder, and also to prevent damage to the machine by stopping the sheet feeding operation.

Furthermore, by looking at the parts attached to the magnetic material, it is possible to know if a sucker part or the like has fallen off, making it possible to prevent a major accident and to collect the parts without scattering them.

Furthermore, by providing a mechanism for adjusting the gap between the magnetic material and the paper, changes in paper thickness can be easily accommodated.

[Brief explanation of the drawing]

Figures 1 to 4 show the paper feed safety device in a printing press according to the present invention, Figure 1 is a general gIIJ plane view of a printing machine in which this is implemented, Figure 2 is a gIU plane view of the paper feed path, FIG. 3 is a side view of the paper feed safety device and a sectional view showing the operating state, and FIG. 4 is a front view. 1...Printing machine, 5...Paper, 7...
...Sucker device, 13...Impression cylinder, 16...
...Swing device, 19...Paper feed path, 34.
... Arm, 37 ... Magnet material, 40 -
...Adjustment knob, 41.42...Electric contact.

Claims (1)

[Scope of utility model registration request] A magnet material that is close to the surface of the paper and extends in the width direction of the paper is installed at the tip of the oscillator in the paper feed path between the suction device that sucks and feeds the paper and the swing device that transfers the paper to the printing cylinder. and an electric contact that closes and stops the paper feeding operation in conjunction with the swinging of the swinging body due to the passage of a foreign object, and a gap adjustment mechanism between the magnetic material and the paper. A paper feed safety device for printing presses featuring: