JPH07285215A - Safety apparatus for printer - Google Patents

Abstract

PURPOSE:To provide a safety apparatus for a printer wherein improvement of the safety of a work during maintenance of the printer is achieved. CONSTITUTION:The first and the second hooking parts 64 and 66 formed on each end part of a supporting shaft 53 for a safety cover 50 are removably and rotatably supported to each of cut parts 61 and 67 on the first and the second holders 56 and 57 and a connecting shaft 68 is freely rotatably supported on a frame 31 and freely movably supported in the shaft direction and the third hooking part 69 hooking to the first hooking part 64 is formed on one end part and it is energized in the hooking direction hooking to the first hooking part 64 by means of a compression spring 71. Therefore, a cam 72 with a cam part 73 corresponding to a closing position of the safety cover 50 is fixed on the connecting shaft 68 and the cam part 73 is detected by means of a limit switch 75 to make it possible to drive a printer only when the safety cover 50 is closed.

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 machine, it is necessary to adjust various devices according to the size and thickness of printing paper, the type of printing, and the like, and an adjusting mechanism is provided for that purpose. However, during the printing work, various adjusting works are not performed by these adjusting mechanisms, and a safety cover is attached for the safety of the work. FIG. 9 schematically shows a register device provided with a conventional safety cover.

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

In front of the difference plate 102 in the sheet feeding direction, a plurality of front rollers 1 for regulating the front and rear positions of the printing sheet 101 are provided.
Rotation shaft 1 in which 05 is rotatably supported by the left and right frames
It is lined up in 06. A swing gripper 107 that feeds the printing paper 101 whose position is regulated to a gripper device of an impression cylinder (not shown) is mounted on the rotary shaft 108 above the front support 105. In addition, 109 is a water supply apparatus.

Therefore, the printing paper 101 is the feed tape 10
The sheet 4 is fed to the difference plate 102 via the sheet feeding board 103, and the front and rear positions thereof are regulated by a plurality of front blocks 105. The swing gripper 107 moves to a predetermined position and holds the printing paper 101 whose front and rear positions are restricted, while the front support 105 retracts. And this swing gripper 1
07 moves and holds the gripped printing paper 101 and conveys it to an impression cylinder (not shown).

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 formed by bending a flat plate at a right angle, and has a support shaft 111 with respect to the frame.
It is freely rotatable and removable. 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 is provided on the frame based on the rotational position of the cam.

Therefore, when adjusting the claw pressure of the swing gripper 107, the operator opens the safety cover 110 at the position shown by the solid line in FIG. 9 upward and rotates it to the position shown by the chain double-dashed line in FIG. Then, a hand is inserted from the formed void to perform maintenance such as adjusting the claw pressure of the swing gripper 107. 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 machine itself does not operate when the safety cover 110 is open.

[0008]

By the way, in the register device provided with the above-mentioned conventional safety cover, the safety cover 110 is rotated upward to be opened when adjusting the pawl pressure of the swing gripper 107, but the workability is improved. To improve
The safety cover 110 is rotated upward and the support shaft 1
It can be removed together with 11.

As described above, in the conventional register device, the printing press itself does not operate when the safety cover 110 is opened in consideration of the safety of work. However, since the detector detects the open / closed state of the safety cover 110 based on the rotational position of the cam attached to the support shaft 111, the safety cover 110 is supported by the support shaft 1 during maintenance.
If it is removed together with 11, the detector will come with a safety cover 11
The open state of 0 cannot be detected, and the printing press operates. As a result, it was not possible to sufficiently secure the safety of work during maintenance.

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

[0011]

A safety device of a printing press according to the present invention for achieving the above object is detachably attached to a frame of the printing press and is pivotally supported by a support shaft so as to be openably and closably supported. The safety cover, the connecting shaft rotatably and axially movably supported on the frame side, and the shaft ends of the supporting shaft of the safety cover and the connecting shaft facing each other, are engaged with each other. Engaging means capable of transmitting the rotation of the support shaft to the connecting shaft, urging means for urging the connecting shaft in the direction of abutting the supporting shaft, a rotation angle of the connecting shaft in the circumferential direction, and It is characterized in that it further comprises a detecting means for detecting a moving position in the axial direction and enabling the printing press to operate only when the safety cover is closed.

The safety device for a printing press according to the present invention is provided with a safety cover pivotally attached to a pair of left and right frames of the printing press by a support shaft so as to be openable and closable, and attached to the pair of frames, respectively. A first through hole having a through hole for detachably and rotatably supporting each end of the support shaft of the safety cover.
From a holder and a second holder, a connecting shaft rotatably and axially movably supported on the one frame side, 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 of a convex portion or a concave portion formed on one end side of the connecting shaft and engaging with the supporting shaft side engaging portion, and the connecting shaft, Energizing means for urging the connecting shaft side engaging portion in a direction in which the connecting shaft side engaging portion engages with the supporting shaft side engaging portion, and a concave portion or a convex portion integrally mounted on the connecting shaft and corresponding to the closing position of the safety cover. And a limit switch which detects the cam portion of the cam and enables the printing press only when the safety cover is closed.

[0013]

The safety cover is rotatable by the support shaft with respect to the frame of the printing machine. When the safety cover is rotated,
With the support shaft of the safety cover, the connecting shaft that engages with the support shaft of the safety cover also rotates by the engaging means, and when the safety cover is removed, the connecting shaft moves in the axial direction by the biasing means. The detecting means detects the rotational angle of the connecting shaft in the circumferential direction and the moving position in the axial direction, and if the safety cover is opened, it disables the printing machine.

The safety cover is rotatable with the support shaft mounted in the through holes of the first holder and the second holder with respect to the frame of the printing machine. When the safety cover is rotated, the support shaft side engaging portion is rotated. Engages 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 moves in the axial direction by the urging means. The detection means detects the rotational angle in the circumferential direction and the axial movement position of the cam portion of the cam integral with the connecting shaft, and activates the limit switch if the safety cover is opened to disable the printing machine. To do.

[0015]

Embodiments of the present invention will now be described in detail with reference to 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, and FIG. 3 is a sectional view taken along line III--III of FIG. FIG. 4 is a perspective view showing the first holder that connects the connecting shaft of the safety device of the printing press of the present embodiment to the support shaft of the safety cover, and FIGS. 5 to 7 are explanatory views of the safety device operation of the printing press of the present embodiment. FIG. 8 shows a front view of the printing machine.

As shown in FIG. 8, the printing machine of the present embodiment is
An offset four-color sheet-fed printing machine comprising a sheet feeding device 12 for feeding a printing sheet 11 and four printing units 13, 14,
It is provided with 15, 16 and a paper discharge device 17. Each of the printing units 13, 14, 15 and 16 has a plate cylinder 18 on which a printing plate for printing is mounted, a blanket cylinder 19 which is in contact with the plate cylinder 18 and onto which an image on the printing plate is transferred, and this rubber. Torso 19
And an impression cylinder 20 that applies a printing pressure in contact with each other, and a transfer cylinder 21 is provided between the printing units 13, 14, 15, and 16.

The register device uses the printing paper 11 sent from the paper feeding device 12 for each printing unit 13, 14, 15, 1.
At 6, the gripper device (not shown) of the impression cylinder 20 is positioned at a predetermined position before being gripped. That is, as shown in FIGS. 1 to 3, between the left and right frames 31 and 32, the difference plate 33 on the upper surface of which the printing paper 11 moves is arranged long in the direction orthogonal to the paper feeding direction (left direction in FIG. 3). The left and right frames 31 and 32 are attached to both sides thereof. A paper feed board 34 is connected to the rear side of the difference plate 33 in the paper feed direction without any step.
A feed tape 36 that is circularly moved by a plurality of rollers 35 is provided behind the.

The rotary shaft 37 is located below and in front of the difference plate 33 in the sheet feeding direction, and the rotary shaft 37 is located on the left and right frames 31 and 3.
The rotary shaft 37 is rotatably mounted, and a plurality of front rollers 38 for regulating the front and rear positions of the printing paper 11 are mounted on the rotary shaft 37 at predetermined intervals. A rotary shaft 39 is rotatably attached to the left and right frames 31 and 32 in front of the difference plate 33 in the paper feeding direction, and is positioned above the rotary plate 39. Printing paper 11
A plurality of swing grippers 40 are attached at predetermined intervals to feed the gripper device to the gripper device (not shown) of the impression cylinder 20.

A large number of paper guides 41, 42, 43, 44 are provided along the paper feed direction of the differential plate 33, and the paper feed board 34 detects the transmittance of the printing paper 11 to print two papers. A two-sheet fixing device 45 is provided to prevent the paper 11 from being fed. In addition, the swing gripper 40
A water supply device 46 is provided above.

In the printing machine of this embodiment, a safety cover 50 is provided on the front side of the swing gripper 40 so as to be openable and closable. The safety cover 50 has an L-shaped cross section in which a flat plate is bent 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, the first holder 56 and the second holder 57 are fixed to the left and right brackets 54 and 55 fixed to the left and right frames 31 and 32 by bolts 58 and 59, respectively. The end portion 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 a through hole 60 into which one end of the support shaft 53 of the safety cover 50 is fitted is formed. The first holder 56 is provided with a notch 61 having an L-shape in plan view on one side in the axial direction of the through hole 60.
It is formed by opening upward from 0. The two holes 62 and 63 formed in the first holder 56 and extending in the direction orthogonal to the through hole 60 are mounting holes for the bracket 54. On the other hand, an uneven first engaging portion 64 that engages with the notch 61 of the first holder 56 is formed at one end of the support shaft 53 of the safety cover 50. Therefore, the support shaft 53 of the safety cover 50
The one end of the first engaging portion 64 has the notch 61 of the first holder 56.
When the support shaft 53 is rotated with the first engaging portion 64 inserted in the notch 61, the two are engaged with each other. It becomes a state and cannot come off.

The second holder 57 fixed to the bracket 55 has the same structure as the above-mentioned first holder 56 in a left-right symmetry, and the second holder 57 supports the safety cover 50. A fitting hole 65 into which the other end of the shaft 53 is fitted is formed, and a notch 67 is formed into which an uneven second engaging portion 66 formed in the other end of the support shaft 53 is engaged. There is.

A connecting shaft 68 is attached to the left frame 31.
Is arranged in line with the support shaft 53 of the safety cover 50,
It is rotatably supported and axially movable. The one end of the connecting shaft 68 has the above-described first holder 56.
The safety cover 5 is fitted in the through hole 60 and is rotatable.
The third engaging portion 69 having a concave and convex shape is formed so as to be engageable with and disengageable 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 is moved to the right in FIG. In the direction, that is, in the direction in which the third engagement portion 69 engages with the first engagement 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, and the safety cover 5 is attached to the cam 72.
A concave cam portion 73 is formed at a position corresponding to the closed position 0 (the position shown in FIG. 3). A limit switch 75 is attached to the left frame 31 by a mounting bracket 74, and a detection portion 76 of the limit switch 75 is in contact with the outer peripheral surface of the cam 72 including the cam portion 73. The limit switch 75 is connected to a drive unit (not shown) of the printing machine, and the detection unit 76 is connected to the cam unit 7.
When the contact portion 3 is in contact with the outer peripheral surface of the cam 72 other than the cam portion 73, it is turned off so that the driving device of the printer can be operated. The drive can be rendered inoperable.

Then, as shown in FIG.
Is fed by the feeding tape 36, then passes through the paper feed board 34, and then the difference plate 3
When it is sent to the upper part 3, the front plate 3
The positions of the front and rear of the sheet are regulated by 8. Then, the swing gripper 40 approaches the difference plate 33 and grips the printing paper 11 whose front and rear positions are regulated, while the front support 38 retracts. Then, the swing gripper 40 moves the printing paper 11
The printing paper 11 is conveyed to the impression cylinder 20 by rotating while holding.

In such a register device, for example, when adjusting the claw pressure of the swing gripper 40, an operator pivots the closed safety cover 50 upward to open it, and further removes it upward. In this state, insert your hand through the empty space to perform the adjustment work. Below, the safety cover 5
The opening / closing operation of 0 will be described.

As shown in FIG. 5, when the safety cover 50 is in the closed state, the safety cover 50 is located in front of the swing gripper 40, and at this time, each end of the support shaft 53 has the first and second holders. Through holes 60 and fitting holes 6 of 56 and 57
7, the engaging portions 64 and 66 are locked and supported by 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 the one end.
9 is engaged with the first engaging portion 64 of the support shaft 53. Further, at this time, the detection unit 76 of the limit switch 75 comes into contact with the cam unit 73 and is turned off, so that the driving device of the printing press can be operated.

When the safety cover 50 is rotated upward in order to adjust the claw pressure of the swing gripper 40 from this state, as shown in FIG. 6, each of the support shafts 53 at the predetermined open position of the safety cover 50. The ends are the first and second holders 56, 5
Although it is fitted and supported in the through hole 60 and the fitting hole 67 of No. 7, the first and second engaging portions 64, 66 have the first
And the notches 61 and 67 of the second holders 56 and 57. On the other hand, the connecting shaft 68 is integrated with the support shaft 53 (safety cover 50) because the third engagement portion 69 is engaged with the first engagement portion 64 of the support shaft 53 by the compression spring 71. Rotate. Then, the detection unit 7 of the limit switch 75
6 comes out of the cam portion 73 and comes into contact with the outer peripheral surface of the cam 72, the limit switch 75 is turned on, and the driving device of the printing machine becomes inoperable.

When the safety cover 50 rotated upward is moved upward, as shown in FIG. 7, in the safety cover 50, the first and second engaging portions 64 and 66 of the support shaft 53 are moved to the first position. Also, since they are aligned with the notches 61 and 67 of the second holders 56 and 57, the engagement state of both is released and the upper holder is removed. On the other hand, since the connecting shaft 68 is biased by the compression spring 71, the safety cover 50 is removed and the support 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 detection unit 76 of the limit switch 75 remains in contact with the outer peripheral surface of the cam 72, the limit switch 75 is in the ON state, and the driving device of the printing press is kept inoperable.

When the maintenance work is completed with the safety cover 50 removed, the safety cover 50 is attached by the device reverse to the above.

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. Occasionally, the worker can rotate the safety cover 50 closed to open it and remove it upward, so that the adjustment work can be performed efficiently. Then, by making the printing machine inoperable in the open state and the detached state of the safety cover 50, the adjustment work can be performed safely.

Further, the safety cover 50 can be easily attached and detached by making the engaging portions 64 and 66 of the support shaft 53 engageable with and disengageable 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, the limit switch 75 is in the ON state, and the driving device of the printing press cannot be operated. In order to turn off the limit switch 75 in this state, that is, when 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. Since the parts 76 must be aligned, it is possible to prevent driving of the printing press due to erroneous operation,
Maintenance work after removal can be safely performed.

Although the safety cover 50 is provided in the register device in the above-mentioned embodiment, the installation position is not limited to this.
It can be installed at any position. Further, although the first engaging portion 64 and the third engaging portion 69 that connect the safety cover 50 and the connecting shaft 68 to each other so as to be integrally rotatable are formed in a concave shape or a convex shape, the invention is not limited to this configuration, and for example, 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 adjusted by the concave-convex engaging portions 6
4, 66 and the notches 61, 67 have been described, but the structure is not limited to them, and for example, an electromagnetic lock mechanism or the like may be used. The support shaft 53 of the safety cover 50 is attached to each holder 5
Although they are supported by 6, 57, they may be directly supported by the shaft end portion of the connecting shaft 68 or the frames 31, 32. Further, the detection means for detecting the open / closed state of the safety cover 50 is composed of the cam 72 having the cam portion 73 fixed to the connecting shaft 68 and the limit switch 75 for detecting the cam portion 73, but the invention is not limited to this. It may be configured by a reflection plate attached to the end of the connecting shaft 68 and a reflection type photoelectric sensor fixed to the frame 31 to detect the reflection plate.

[0035]

As described above in detail with reference to the embodiments, according to the safety device of the printing press of the present invention, the safety cover is detachable from the frame of the printing press and can be opened and closed by the support shaft. And a connecting shaft that is rotatable in the frame side and movable in the axial direction is provided, and the engaging shaft engages the opposing shaft ends of the supporting shaft of the safety cover and the connecting shaft to connect the rotation of the supporting shaft. The safety cover is configured so that it can be transmitted to the shaft, and the biasing means biases the connecting shaft in the direction of abutting against the support shaft, and the detecting means detects the rotational angle of the connecting shaft in the circumferential direction and the moving position in the axial direction. Since the printing machine can be operated only when the machine is closed, various mechanisms are provided with a safety cover during operation of the printing machine to prevent foreign matter from being inserted.When the machine is maintained, it is possible to detect whether the safety cover is open or removed. Printing machine By disabling operation, you can adjust work safely, it is possible to improve the safety of the work.

Further, according to the safety device of the printing machine of the present invention, each end of the support shaft of the safety cover is detachable and rotatable by the first holder and the second holder attached to the pair of frames. And the connecting shaft is rotatably supported on one frame side and is movable in the axial direction, and a supporting shaft side engaging portion composed of a concave portion or a convex portion is formed on one end side of the supporting shaft of the safety cover. A connecting shaft side engaging portion formed of a convex portion or a concave portion that engages with the supporting shaft side engaging portion is formed on one end side of the connecting shaft, and the connecting shaft is supported by the urging means. A cam having a cam portion formed by a concave portion or a convex portion corresponding to the closing position of the safety cover is integrally attached to the connecting shaft by urging in the direction of engaging the side engaging portion, and the cam portion of the cam is operated by the limit switch. Is detected and the printing machine is operated only when the safety cover is closed. Since it is possible, during maintenance of the machine, the limit switch detects the open state and the removed state of the safety cover to make the printing machine inoperable. Can be done.

[Brief description of drawings]

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

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

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view showing a first holder that connects a connecting shaft and a supporting shaft of a safety cover in the safety device of the printing machine according to the present embodiment.

FIG. 5 is an explanatory view of the operation of the safety device of the printing machine of the present embodiment, which is a state diagram showing a closed state of the safety cover.

FIG. 6 is a diagram for explaining the operation of the safety device of the printing machine according to the present embodiment, and is a state diagram showing an opened state of the safety cover.

FIG. 7 is a diagram for explaining the operation of the safety device of the printing machine according to the present embodiment, which is a state diagram illustrating a state where the safety cover is removed.

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

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

[Explanation of symbols]

 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, Engaging Means) 65 Fitting Joint hole 66 Second engaging portion 67 Notch 68 Connecting shaft 69 Third engaging portion (connecting shaft side engaging portion, engaging means) 71 Compression spring (biasing means) 72 Cam 73 Cam portion 75 Limit switch (detecting means) )

Claims (2)

[Claims] 1. A safety cover that is detachably attached to a frame of a printing machine and pivotally mounted by a support shaft to be openably and closably supported, and is supported rotatably and axially movably on the frame side. Connecting shaft, engagement means for engaging the shaft ends of the supporting shaft of the safety cover and the connecting shaft, which are opposed to each other, and transmitting the rotation of the supporting shaft to the connecting shaft, and the connecting shaft. Urging means for urging the contact shaft against the support shaft, the rotational angle of the connecting shaft in the circumferential direction and the moving position in the axial direction are detected, and the printing machine can be operated 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 a printing press by a support shaft to be openably and closably supported, and end portions of support shafts of the safety cover that are respectively attached to the pair of frames. A first holder and a second holder having through holes that rotatably and rotatably support a connecting shaft that is rotatably and axially movably supported on the one frame side. Supporting shaft side engaging portion formed of a concave portion or a convex portion formed on one end side of the supporting shaft, and a convex portion formed on one end side of the connecting shaft for engaging the supporting shaft side engaging portion or A connecting shaft side engaging portion formed of a recess, an urging means for urging the connecting shaft in a direction in which the connecting shaft side engaging portion engages with the supporting shaft side engaging portion, and the connecting shaft integrally. A recess or protrusion that is mounted and corresponds to the closed position of the safety cover A cam having a cam portion consisting of
A safety device for a printing press, comprising: a limit switch that detects the cam portion of the cam and enables the printing press only when the safety cover is closed.