JP3347466B2 - Printing press safety devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a printing press for safely performing maintenance work on the printing press.

[0002]

2. Description of the Related Art In a printing press, it is necessary to adjust various devices in accordance with the size and thickness of printing paper, the type of printing, and the like, and an adjustment mechanism is provided. However, during the printing operation, these adjustment mechanisms do not perform various adjustment operations, and a safety cover is attached for safety of the operation. FIG. 9 schematically shows a conventional register device provided with a safety cover.

In a sheet-fed offset printing press or the like, a register device positions printing paper sent from a paper feeding unit at a predetermined position before a gripper device provided on an impression cylinder grips the printing paper. That is, as shown in FIG. 9, the difference plate 102 on which the printing paper 101 moves on the upper surface is long in a direction orthogonal to the paper feeding direction, and both sides are supported by left and right frames (not shown). A sheet feed board 103 is connected without a step behind the difference plate 102 in the sheet feeding direction.
A feed tape 1 circulating behind the paper feed board 103
04 is provided.

[0004] Further, a plurality of front contacts 1 for regulating the front and rear positions of the printing paper 101 are provided forward of the difference plate 102 in the paper feeding direction.
05 is a rotating shaft 1 rotatably supported by left and right frames
06. A swing gripper 107 for feeding the printing paper 101 whose position is regulated to a holding claw device (not shown) is mounted on the rotating shaft 108 above the forehead 105. In addition, 109 is a water supply device.

[0005] Therefore, the printing paper 101 is
4, the sheet is fed onto the difference plate 102 via the sheet feeding board 103, and the front and rear positions are regulated by a plurality of front contacts 105. The swing gripper 107 moves to a predetermined position and holds the printing paper 101 whose front / rear position is regulated, while the forehead 105 retracts. And this swing gripper 1
Reference numeral 07 conveys the moved printing paper 101 to an impression cylinder (not shown).

[0006] In such a register device, a safety cover 110 is conventionally provided on the front side of the swing gripper 107. The safety cover 110 has an L-shaped cross section obtained by bending a flat plate at a right angle, and supports the support shaft 111 with respect to the frame.
And can be freely attached and detached. A cam (not shown) is integrally provided on the support shaft 111, and a detector for detecting the open / closed state of the safety cover 110 based on the rotational position of the cam is provided on the frame.

Therefore, when adjusting the claw pressure of the swing gripper 107, the operator opens the safety cover 110, which is located at the solid line in FIG. 9, upward and rotates it to the position shown by the two-dot chain line in FIG. Then, maintenance such as adjustment of the claw pressure of the swing gripper 107 is performed by inserting a hand from the formed space. At this time, in consideration of work safety, the detector detects the open / closed state of the safety cover 110 based on the rotational position of the cam, so that the printing press itself does not operate when the safety cover 110 is opened.

[0008]

By the way, in the above-described register device provided with the conventional safety cover, the safety cover 110 is turned upward and opened when the claw pressure of the swing gripper 107 is adjusted. To improve
When the safety cover 110 is rotated upward, the support shaft 1
11 can be removed.

As described above, in the conventional register device, the printing press itself is not operated when the safety cover 110 is opened in consideration of the safety of operation. However, since the detector detects the open / close state of the safety cover 110 based on the rotation position of the cam attached to the support shaft 111, the safety cover 110 is attached to the support shaft 1 during maintenance.
If the detector is removed together with the safety cover 11,
The open state of 0 cannot be detected, and the printing press operates. As a result, work safety during maintenance could not be sufficiently achieved.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a printing press safety device which improves the safety of work during maintenance of the printing press.

[0011]

A safety device for a printing press according to the present invention for achieving the above object is detachably mounted on a frame of the printing press, pivotally supported by a support shaft, and opened and closed freely. A safety cover, a connecting shaft rotatably supported on the frame side and movably in the axial direction, and a shaft end of the supporting shaft of the safety cover facing the connecting shaft engaged with the connecting shaft. Engagement means for transmitting the rotation of the support shaft to the connection shaft; biasing means for biasing the connection shaft in a direction in which the connection shaft comes into contact with the support shaft; and a rotation angle and a rotation angle of the connection shaft in the circumferential direction. Detecting means for detecting a movement position in the axial direction and enabling operation of the printing press only when the safety cover is closed.

A safety device for a printing press according to the present invention includes a safety cover pivotally attached to a pair of left and right frames of the printing press by a support shaft and supported in an openable and closable manner. A first hole having a through hole for detachably and rotatably supporting each end of the support shaft of the safety cover;
A holder and a second holder, a connecting shaft rotatably supported on the one frame side and movably in the axial direction, and a concave portion or a convex portion formed on one end side of the support shaft of the safety cover. A supporting shaft side engaging portion, a connecting shaft side engaging portion formed on one end side of the connecting shaft and formed of a convex portion or a concave portion engaging with the supporting shaft side engaging portion, and the connecting shaft. Urging means for urging the connecting shaft side engaging portion to engage with the support shaft side engaging portion; and a concave portion or a convex portion integrally mounted on the connecting shaft and corresponding to the closed position of the safety cover. And a limit switch that detects the cam portion of the cam and enables the printing machine to operate only when the safety cover is closed.

[0013]

The safety cover is rotatable by a support shaft with respect to the frame of the printing press.
The connecting shaft which engages with the support shaft of the safety cover by the engaging means rotates together with the support shaft of the safety cover, and when the safety cover is removed, the connecting shaft moves in the axial direction by the urging means. The detecting means detects the rotation angle of the connecting shaft in the circumferential direction and the moving position in the axial direction, and if the safety cover is opened, makes the printing machine inoperable.

The safety cover has a support shaft mounted on through holes of the first holder and the second holder with respect to a frame of the printing press, and is rotatable. When the safety cover is rotated, the support shaft side engaging portion is provided. By engaging with the connecting shaft side engaging portion, the connecting shaft rotates together with the support shaft of the safety cover, and when the safety cover is removed, the connecting shaft is moved in the axial direction by the urging means. The detecting means detects the rotation angle in the circumferential direction and the moving position in the axial direction of the cam portion of the cam integrated with the connecting shaft, and if the safety cover is opened, activates the limit switch to determine that the printing machine cannot be operated. I do.

[0015]

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

FIG. 1 is a plan view of a register equipped with a printing press safety device according to an embodiment of the present invention, FIG. 2 is a side view of the register, FIG. 3 is a cross section taken along the line III-III of FIG. FIG. 4 is a perspective view showing a first holder for connecting a connection shaft and a support shaft of a safety cover in the safety device for a printing press according to the present embodiment, and FIGS. FIG. 8 shows a front view of the printing press.

As shown in FIG. 8, the printing press of this embodiment
An offset four-color sheet-fed printing press, comprising a paper feeder 12 for supplying a printing paper 11 and four printing units 13, 14, 14.
15 and 16 and a paper discharging device 17. Each of the printing units 13, 14, 15, and 16 includes a plate cylinder 18 on which a printing plate is mounted, a blanket cylinder 19 in contact with the plate cylinder 18 and an image on the plate is transferred, and Torso 19
And an impression cylinder 20 for applying a printing pressure in contact with the printing unit 13, and a transfer cylinder 21 is provided between the printing units 13, 14, 15, and 16.

The register device converts the printing paper 11 sent from the paper feeding device 12 into the printing units 13, 14, 15, 1.
At 6, the impression cylinder 20 is positioned at a predetermined position before an unillustrated gripper device is gripped. That is, as shown in FIG. 1 to FIG. 3, between the left and right frames 31, 32, a difference plate 33 on the upper surface of which the printing paper 11 moves is long in the direction perpendicular to the paper feeding direction (left direction in FIG. 3). And both sides thereof are attached to the left and right frames 31, 32. A paper feed board 34 is connected to the rear of the difference plate 33 in the paper feed direction without any step.
A feed tape 36 that is circulated by a plurality of rollers 35 is provided behind the feed roller 36.

The rotary shaft 37 is located below and in front of the difference plate 33 in the sheet feeding direction, and
2, a plurality of front abutments 38 for regulating the front and rear positions of the printing paper 11 are mounted on the rotating shaft 37 at predetermined intervals. A rotary shaft 39 is rotatably mounted on the left and right frames 31 and 32 at a position above and in front of the difference plate 33 in the sheet feeding direction, and the front and rear positions of the rotary shaft 39 are regulated by the front abutment 38. Printing paper 11
A plurality of swing grippers 40 are provided at predetermined intervals to feed the gripper device (not shown) of the impression cylinder 20.

A number of paper guides 41, 42, 43, and 44 are provided along the sheet feeding direction of the difference plate 33, and the paper feed board 34 detects the transmittance of the printing paper 11 to print two sheets. A two-sheet stopping device 45 for preventing the paper 11 from being fed is provided. In addition, the swing gripper 40
Above is provided a water supply device 46.

In the printing press of the present embodiment, a safety cover 50 is provided at the front side of the swing gripper 40 so as to be freely opened and closed. The safety cover 50 has an L-shaped cross section obtained by bending a flat plate at a right angle, and a support shaft 53 integrally fixed by a plurality of bolts 52 via an L-shaped reinforcing plate 51.
have. On the other hand, a first holder 56 and a second holder 57 are fixed to left and right brackets 54 and 55 fixed to the left and right frames 31 and 32 by bolts 58 and 59, respectively. An end of the support shaft 53 of the safety cover 50 is detachably and rotatably supported by the holder 57.

That is, as shown in detail in FIG. 4, the first holder 56 has a rectangular block shape, and has a through hole 60 into which one end of the support shaft 53 of the safety cover 50 is fitted. The first holder 56 is provided with a notch 61 having an L-shape in plan view in one axial direction of the through hole 60.
It is formed so as to open upward from zero. Note that two holes 62 and 63 formed in the first holder 56 along a direction orthogonal to the through hole 60 are mounting holes for the bracket 54. On the other hand, at one end of the support shaft 53 of the safety cover 50, a first engaging portion 64 having a concave and convex shape to be engaged with the notch 61 of the first holder 56 is formed. Therefore, the support shaft 53 of the safety cover 50
One end of the first holder 56 is formed by the notch 61 of the first holder 56.
When the support shaft 53 is rotated while the first engagement portion 64 is inserted into the notch 61, the two are engaged. It becomes a state and does not come off.

The second holder 57 fixed to the bracket 55 has substantially the same structure as that of the above-mentioned first holder 56 symmetrically to the left and right, and the second holder 57 supports the safety cover 50. A fitting hole 65 into which the other end of the shaft 53 fits is formed, and a notch 67 is formed with the second engaging portion 66 formed in the other end of the support shaft 53 so as to engage. I have.

A connecting shaft 68 is provided on the left frame 31.
Are disposed in line with the support shaft 53 of the safety cover 50,
It is rotatably supported movably in the axial direction. One end of the connection shaft 68 is connected to the first holder 56 described above.
Of the safety cover 5
A third engaging portion 69 having an uneven shape is formed so as to be detachable from the first engaging portion 64 of the support shaft 53 of No. 0. A stopper 70 is fixed to the connecting shaft 68, and a compression spring 71 is interposed between the frame 31 and the stopper 70, and the support shaft 53 moves rightward in FIG. Direction, that is, the third engaging portion 69 is urged in a direction of engaging with the first engaging portion 64 of the support shaft 53.

On the other hand, a cam 72 is integrally fixed to the other end of the connecting shaft 68.
A cam portion 73 having a concave shape is formed at a position corresponding to the closing position of 0 (the position shown in FIG. 3). A limit switch 75 is mounted on the left frame 31 by a mounting bracket 74, and a detection unit 76 of the limit switch 75 is in contact with the outer peripheral surface of the cam 72 including the cam 73. The limit switch 75 is connected to a driving device (not shown) of the printing press.
3 and turns on when the detection unit 76 is in contact with the outer peripheral surface of the cam 72 other than the cam unit 73, and turns on when the detection unit 76 contacts the outer peripheral surface of the cam 72 other than the cam unit 73. The drive can be disabled.

Thus, as shown in FIG.
Is the feed plate 36 and the difference plate 3
3, a plurality of front contacts 3
The position of the front and back of the sheet is regulated by 8. Then, while the swing gripper 40 approaches the difference plate 33 and adds the printing paper 11 whose front and rear position is regulated, the front contact 38 is retracted. Then, the swing gripper 40 is attached to the printing paper 11.
The print paper 11 is conveyed to the impression cylinder 20 by rotating while holding the print paper 11.

In such a register device, for example, when adjusting the claw pressure of the swing gripper 40, the operator turns the closed safety cover 50 upward to open it, and further removes it upward. In this state, a hand is inserted from the formed space to perform the adjustment work. Hereinafter, the safety cover 5
The opening / closing operation of 0 will be described.

As shown in FIG. 5, when the safety cover 50 is closed, the safety cover 50 is located in front of the swing gripper 40. At this time, each end of the support shaft 53 is connected to the first and second holders. 56, 57 through-holes 60 and fitting holes 6
7, the engaging portions 64 and 66 are supported by being locked in the notches 61 and 67. On the other hand, the connecting shaft 68 is urged in the axial direction by the compression spring 71, and the third engaging portion 6 at one end is provided.
9 is engaged with the first engagement portion 64 of the support shaft 53. At this time, the detection unit 76 of the limit switch 75 contacts the cam unit 73 and is turned off, and the driving device of the printing press is operable.

When the safety cover 50 is rotated upward to adjust the claw pressure of the swing gripper 40 from this state, as shown in FIG. The ends are the first and second holders 56, 5
7, the first and second engaging portions 64, 66 are fitted into the through holes 60 and the fitting holes 67, and are supported by the first and second engaging portions 64, 66.
And the notches 61, 67 of the second holders 56, 57. On the other hand, since the third engagement portion 69 is engaged with the first engagement portion 64 of the support shaft 53 by the compression spring 71, the connection shaft 68 is integrated with the support shaft 53 (safety cover 50). Rotate. Then, the detection unit 7 of the limit switch 75
6 comes off the cam portion 73 and comes into contact with the outer peripheral surface of the cam 72, so that the limit switch 75 is turned ON and the driving device of the printing press becomes inoperable.

When the safety cover 50 that has been turned upward is moved upward, as shown in FIG. 7, the safety cover 50 is configured such that the first and second engagement portions 64 and 66 of the support shaft 53 are in the first position. And the notches 61, 67 of the second holders 56, 57 coincide with each other, so that the engagement between them is released and the two holders are removed upward. On the other hand, since the connecting shaft 68 is biased by the compression spring 71, the safety cover 50 is removed and the supporting shaft 5 is removed.
When 3 is removed from the first and second holders 56 and 57, the connecting shaft 68 moves slightly in the axial direction. But,
The detecting portion 76 of the limit switch 75 is kept in contact with the outer peripheral surface of the cam 72, and the driving device of the printing press is kept inoperable with the limit switch 75 in the ON state.

When the maintenance work is completed in a state where the safety cover 50 is removed, the safety cover 50 is mounted by the reverse device.

As described above, in the safety device for a printing press according to the present embodiment, the swing gripper 40 is provided with the safety cover 50, and maintenance of the machine such as adjusting the claw pressure of the swing gripper 40 is performed. At times, the operator can turn the closed safety cover 50 upward to open it, and remove it upward, so that the adjustment work can be performed efficiently. When the safety cover 50 is opened and removed, the printing press is made inoperable, so that the adjustment work can be performed safely.

Further, the safety cover 50 can easily attach and detach the safety cover 50 by making the engaging portions 64 and 66 of the support shaft 53 detachable from the notches 61 and 67. Further, when the safety cover 50 is removed, the detecting portion 76 of the limit switch 75 is in contact with the outer peripheral surface of the cam 72, and the driving device of the printing press is inoperable with the limit switch 75 being ON. In this state, that is, in order to turn off the limit switch 75 in the state where the safety cover 50 is removed, the cam 72 is rotated by a predetermined amount and moved in the axial direction to detect the cam portion 73 of the cam 72 and the limit switch 75. It is necessary to match the parts 76, and it is possible to prevent the printing press from being driven by erroneous operation,
Maintenance work after removal can be performed safely.

In the above-described embodiment, the safety cover 50 is provided on the register, but the installation position is not limited to this.
It may be installed at any position. Further, the first engagement portion 64 and the third engagement portion 69 for connecting the safety cover 50 and the connection shaft 68 so as to be integrally rotatable are formed in a concave shape or a convex shape. However, the present invention is not limited to this configuration. Serration engagement may be used. Further, the engagement / disengagement relationship between the support shaft 53 of the safety cover 50 and each of the holders 56 and 57 is determined by the concave and convex engagement portions 6.
4, 66 and the notches 61, 67, but the present invention is not limited to this configuration. For example, an electromagnetic lock mechanism may be used. Then, the support shaft 53 of the safety cover 50 is attached to each holder 5.
6, 57, but may be directly supported by the shaft end of the connecting shaft 68 or the frames 31, 32. Further, the detecting means for detecting the open / closed state of the safety cover 50 is constituted by the cam 72 fixed to the connecting shaft 68 and having the cam portion 73 and the limit switch 75 for detecting the cam portion 73, but is not limited thereto. It may be constituted by a reflector attached to the end of the connecting shaft 68 and a reflective photoelectric sensor fixed to the frame 31 and detecting the reflector.

[0035]

As described above in detail with reference to the embodiments, according to the safety device for a printing press of the present invention, a safety cover which is detachable from a frame of the printing press and which can be opened and closed by a support shaft. And a connecting shaft rotatable and movable in the axial direction on the frame side, and the opposite shaft ends of the supporting shaft of the safety cover and the connecting shaft are engaged by engaging means to connect the rotation of the supporting shaft. The safety cover can be transmitted to the shaft, and the connecting shaft is urged by the urging means in the direction in which the connecting shaft comes into contact with the support shaft. The printing press can be operated only when the printer is closed.Safety covers are provided on various mechanisms during printing press operation to prevent foreign matter from being inserted, and during maintenance of the machine, the open and removed states of the safety cover are detected. Printing press By disabling operation, you can adjust work safely, it is possible to improve the safety of the work.

According to the safety device for a printing press of the present invention, each end of the support shaft of the safety cover is detachably and rotatable by the first holder and the second holder mounted on the pair of frames. The support shaft is rotatably supported on one frame side and movably in the axial direction, and a support shaft side engaging portion comprising a concave portion or a convex portion is formed at one end of the support shaft of the safety cover. A connecting shaft side engaging portion comprising a convex portion or a concave portion engaging with the supporting shaft side engaging portion is formed on one end side of the connecting shaft, and the connecting shaft is connected to the supporting shaft by an urging means. A cam having a cam portion comprising a concave portion or a convex portion corresponding to the closed position of the safety cover is attached integrally to the connecting shaft by urging in a direction engaging with the side engaging portion, and the cam portion of the cam is mounted by a limit switch. Is detected and the printing press runs only when the safety cover is closed. During maintenance of the machine, the limit switch detects the open and removed states of the safety cover during machine maintenance, and disables the printing press. Can be done.

[Brief description of the drawings]

FIG. 1 is a plan view of a register device equipped with a safety device for a printing press according to an embodiment of the present invention.

FIG. 2 is a side view of the register device.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a perspective view illustrating a first holder that connects a connection shaft and a support shaft of a safety cover in the safety device for a printing press according to the present embodiment.

FIG. 5 is a diagram illustrating the operation of the safety device of the printing press according to the present embodiment, and is a state diagram illustrating a closed state of the safety cover.

FIG. 6 is a diagram illustrating the operation of the safety device of the printing press according to the present embodiment, and is a state diagram illustrating an opened state of the safety cover.

FIG. 7 is a diagram illustrating the operation of the safety device of the printing press according to the present embodiment, and is a state diagram illustrating a state in which a safety cover is removed.

FIG. 8 is a front view of the printing press.

FIG. 9 is a schematic view of a conventional register device provided with a safety cover.

[Explanation of symbols]

 Reference Signs List 11 printing paper 31, 32 frame 50 safety cover 53 support shaft (shaft) 56 first holder 57 second holder 60 through hole 61 notch 64 first engagement part (support shaft side engagement part, engagement means) 65 fit Mating hole 66 Second engaging part 67 Notch 68 Connecting shaft 69 Third engaging part (connecting shaft side engaging part, engaging means) 71 Compression spring (biasing means) 72 Cam 73 Cam part 75 Limit switch (Detecting means) )

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 13/00 B41F 13/42 B41F 33/00

Claims (2)

(57) [Claims] 1. A safety cover which is detachably attached to a frame of a printing press, is pivotally attached to a support shaft and is supported so as to be openable and closable, and is supported on the frame side so as to be rotatable and movable in an axial direction. A coupling shaft, engagement means for engaging a shaft end of the support shaft of the safety cover and the coupling shaft facing each other to transmit rotation of the support shaft to the coupling shaft, and the coupling shaft; Urging means for urging the printing press in the direction of contact with the support shaft, and detecting the rotational angle of the connecting shaft in the circumferential direction and the moving position in the axial direction to operate the printing press only when the safety cover is closed. A safety device for a printing press, comprising: 2. A safety cover pivotally attached to a pair of left and right frames of the printing press by a support shaft and supported to be openable and closable, and each end of the support shaft of the safety cover mounted on each of the pair of frames. A first holder and a second holder having through holes for detachably and rotatably supporting the shaft, a connecting shaft rotatably and axially movably supported on the one frame side, and the safety cover A support shaft side engaging portion formed of a concave portion or a convex portion formed on one end side of the support shaft; and a convex portion formed on one end side of the connection shaft and engaging with the support shaft side engaging portion. A connecting shaft side engaging portion formed of a concave portion; an urging means for urging the connecting shaft in a direction in which the connecting shaft side engaging portion engages with the support shaft side engaging portion; A concave or convex portion mounted and corresponding to the closed position of the safety cover A cam having a cam portion comprising
A limit switch for detecting a cam portion of the cam and enabling the printing machine to operate only when the safety cover is closed.