JPH0337955Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-sided/double-sided printing machine, and more particularly to a reversing gripper switching device that completely separates the opening/closing means of the reversing gripper from the control cam when switching between single-sided printing and double-sided printing.

Single-sided/double-sided sheet-fed printing presses are very popular because of their wide range of applications. When performing single-sided printing with this dual-purpose machine, the leading edge gripper of the double-diameter transfer cylinder grasps the leading edge of the sheet, and the leading edge is gripped by the gripper of the reversing cylinder at a fixed transfer point. . The reversing gripper then rotates while gripping the leading edge of this sheet and sends it to the next printing unit.

On the other hand, in the case of double-sided printing, the reversing gripper receives the trailing edge of the sheet from the trailing edge gripper of the transfer cylinder, and as the reversing cylinder rotates, the sheet is reversed and sent to the next printing unit. Therefore, the reversing gripper that grips the leading edge or trailing edge of a sheet has different gripping methods (including posture, timing, etc.) depending on whether it is single-sided or double-sided printing.
It opens and closes with.

The reversing gripper is configured by a combination of a fixed pawl and a swinging pawl provided on a pawl shaft rotatably supported on the reversing cylinder. and,
Single-sided printing/biting motion of these inverted grippers
In order to control each case of double-sided printing, two types of control cams, one for single-sided printing and one for double-sided printing, are arranged in a pair, and one for the fixed claw of the gripper and one for the rocker are mounted on the left and right side walls of the machine, respectively. For use as a movable claw, it is fixed coaxially with the main shaft of the reversing cylinder.
Corresponding to these control cams, the reversing cylinder side has fixed claw and Two types of cam arms are provided for the swinging pawl. In addition, at one end of these cam arms, a support member for a cam roller that selectively abuts the control cam by the pressing force of a spring and rolls in response to the cam surface of the control cam is attached to the axis of the arm shaft. It is fastened with a screw so that it can move in the direction.

In this way, the cam roller of the cam arm that regulates the opening and closing operations of the reversing gripper is strongly pressed by the spring against either one of the control cams for single-sided printing or for double-sided printing, and is in contact with the cam surface. Therefore, when changing the setting for single-sided printing/duplex printing, move the position of the cam roller or its support member parallel to the arm axis so that the single-sided printing/duplex printing settings are parallel to each other. Therefore, the contact position of the cam roller must be switched to one of the cam surfaces of the pair of control cams.

As a cam roller switching device suitable for such uses, Japanese Patent Publication No. 55-27855 describes the following:
"When adjusting the switching movement of the control cam and traveling roller,
An apparatus is disclosed in which a control member supporting a running roller and an insertable tool projecting significantly beyond the reversing cylinder circumferential surface are configured to cooperate to lift the running roller from a control cam. .

However, in this prior art, since the cam roller mounting screw is loosened while being strongly pressed, the cam roller mounting portion is likely to be deformed or misaligned. In addition, since a special ``remarkably protruding'' tool is inserted, the stopping range of the reversing cylinder in which switching operations can be performed is extremely limited. Furthermore, the cam roller must be loosened and tightened many times, making the work complicated and time-consuming. In addition, it requires skillful use of specialized tools, which is also inefficient.

The present invention was made in order to fundamentally solve the above-mentioned problems, and provides an advanced reversing gripper switching device.The purpose of this invention is to prevent deformation or misalignment of the cam roller mounting area,
To do not require a special tool for switching work, to have a wide and flexible stopping range for a reversing cylinder, and to be able to complete the work simply and in a short time.

In order to achieve these objectives, the two types of cam arms in the proposed device basically have an extension on the side opposite to the roller support member with respect to the arm axis, and are rotatably attached to the side wall of the fuselage. is,
The intermediate lever has one end that can come into contact with the extension, but is normally biased away from the extension, and the intermediate lever is biased when switching between single-sided printing and double-sided printing. release means is provided for rotating the two cam arms against the force pressing the cam roller against the control cam and separating the cam roller from the control cam. .

Furthermore, in one embodiment of the present invention, the intermediate lever is modified to provide a sophisticated means for intervening between the side wall and the reversing cylinder.

Furthermore, in another embodiment, the release means comprises a release shaft parallel to the main axis of the reversing cylinder, a handle attached to the release shaft, and a release cam cooperating with the intermediate lever. has been done.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 shows an embodiment of a switching device for a reversing gripper according to the present invention, and Fig. 2 is a side view seen from the direction of the arrow in Fig. 4, and Fig. 2 is a side view similarly seen from the direction of the arrow in Fig. 4. 3 is a plan view of the switching device according to the present invention, and FIG. 4 is a cross-sectional explanatory view showing the gripper device of the reversing cylinder in plan view.

In FIG. 4, 1a and 1b indicate side walls of the printing press, and between these side walls 1a and 1b, the main shaft 2 of the reversing cylinder is rotatably installed horizontally via bearings 3a and 3b. On both sides of the main shaft 2, there are shoulder parts 4a of the reversible cylinder,
4b are attached in pairs, and serve as mounting bases for a claw shaft 5, an arm shaft 6, etc., which will be described later.
Further, the control cams 7a, 7b are fixed coaxially with the main shaft 2 to the bearings 3a, 3b of the side walls 1a, 1b. These control cams 7a and 7b are a pair of cams for single-sided printing and double-sided printing, and are arranged in parallel to a bearing 3a on the right side wall 1a in the drawing and a bearing 3b on the left side wall 1b in the drawing, respectively. In this case, it does not matter whether one of the two types of cams arranged side by side as a pair is for single-sided printing or double-sided printing. Further, as long as two types of cams are juxtaposed, the shape of the cam surface may be any shape. However, in the following explanation, we will refer to the control cam 7 on the right side of the drawing.
It is assumed that a controls the swinging claw of the gripper, and the left control cam 7b controls the fixed claw.

Gripper claw shafts 5 are rotatably attached to the shoulders 4a, 4b of the reversing barrel in parallel to the main shaft 2 by bearings 8a, 8b. This claw shaft 5
is a base shaft that supports a large number of grippers consisting of a combination of fixed claws 9 and swinging claws 10,
In the drawing, only one set is shown as a representative of these grippers. Incidentally, grippers consisting of a combination of fixed claws and swinging claws are already well known.
For example, the details can be found in JP-A-55-146760 and JP-A-50-130507. Of the grippers, the fixed claws 9 are fixed to the claw shaft 5, and the swinging claws 10 are supported so as to be swingable about the claw shaft 5. A bar 11 is provided so as to be able to swing around the pawl shaft 5 and parallel to the pawl shaft 5.
is pushed. As a result, the fixed claw 9 and the swinging claw 10 open and close their gripping claws to grip and release the front edge of the paper in the case of single-sided printing, and the rear edge of the paper in the case of double-sided printing. It is. For the purposes of this case, however, the details of the gripper are no longer in question. The same applies even if the gripper is provided with a spring for the purpose of impact or the like.

Next, to explain the means for opening and closing the gripper, the shoulders 4a and 4b have a
Further, the arm shaft 6 is rotatably assembled via bearings 12a and 12b. This arm shaft 6
On the right side of the drawing, cam arm 1 for the swinging claw is shown.
3a, and a cam arm 13b for a fixed claw is attached on the left side, and the fixed claw 9,
It serves as a pivot for the movement of opening and closing the swing claw 10. To explain the cam arm 13a for the swinging claw assembled to this arm shaft 6, this cam arm 13a is fixed to the end of the arm shaft 6, and via the sector gear 14 also fixed to the arm shaft 6, It acts on the bar 11 and acts on the swinging claw 10 of the gripper. a cam arm 13a on the opposite side of the claw shaft 5 with respect to the arm shaft 6;
A roller support member 15a is installed horizontally in the direction of the control cam 7a in parallel with the arm shaft 6 at the end thereof, and a cam roller 16a that contacts the control cam 7a is provided on the roller support member 15a. The end of the cam arm 13a has a so-called "slot" so that the roller support member 15a is clamped and fixed therebetween. Reference numeral 17a indicates the tightening screw, and the roller support member 15a to which the cam roller 16a is attached is moved parallel to the arm shaft 6 according to the setting change of single-sided printing/duplex printing, and one pair of two types of control is performed. After the cam roller 16a is brought into contact with one of the cams 7a, the roller support member 15a is tightened and fixed. As described above, the cam roller 16a is strongly pressed against the cam surface of the control cam 7a by a spring (not shown). Next, turning to the left side of the drawing, the cam arm 13b for the fixed claw will be explained.
This cam arm 13b is rotatably mounted around the arm shaft 6 by a bearing 18,
It acts on the pawl shaft 5 via the sector gear 19 and acts on the fixed pawl 9. Cam arm 1 for the swinging claw
3a, the claw shaft 5 with respect to the arm shaft 6
A support member 15b for a cam roller 16b is provided parallel to the arm shaft 6 at the end of the cam arm 13b on the opposite side. This roller support member 15
b, cam roller 16b, tightening screw 17b, etc. are exactly the same as those for the swing claw.

Now, the features of the embodiment of the reversing gripper switching device according to the present invention are as follows. That is,
In the present invention, the two cam arms 13a and 13b are simply sector gears 14 and 19, respectively.
In addition to acting on the swinging pawl 10 and the fixed pawl 9 via the roller supporting members 15a and 15b, extending portions 20a and 20b are respectively provided on the side opposite to the roller support members 15a and 15b with respect to the arm shaft 6 serving as a fulcrum. Of course, these extending portions 20a and 20b function integrally as cam arms 13a and 13b without any interference with the main shaft 2 of the reversing cylinder. In other words, when some rotational moment is applied to these extensions 20a and 20b, the roller support member 15 located on the opposite side with the arm shaft 6 as a fulcrum is rotated.
a, 15b and cam rollers 16a, 16b
It will be immediately understood that this can have an effect on

Extensions 20a, 2 of cam arms 13a, 13b
The intermediate lever for applying a moment to 0b is only slightly shown in Figure 4, but Figure 1 shows the mechanism that acts on the cam arm 13a for the swinging pawl, and the mechanism for the fixed pawl. This is clearly shown in FIG. 2, which shows the mechanism acting on the cam arm 13b, and FIG. 3, which shows these mechanisms integrally and in a plan view. In addition, in the following explanation, the mechanism that acts on the cam arm 13a for the swinging claw and the mechanism that acts on the cam arm 13b for the fixed claw are basically the same, and the actual actions are also simultaneous and parallel. Therefore, the suffix a is attached to the cam arm 13a for the swing claw, and the suffix b is attached to the cam arm 13b for the fixed claw to simplify the explanation.

The cam arm is interposed between the two types of cam arms 13a and 13b and a release means (this will be described later) that centrally releases these from the biasing spring (not shown, as described above). The intermediate lever that applies moment to 13a and 13b is constructed as follows. That is,
Support shafts 21a, 21b are fixed to the side walls 1a, 1b in parallel with the main shaft 2 of the reversing cylinder, respectively, and the lever bodies 22a, 22b are attached to the support shafts 21a, 21.
It is rotatable around b. The extending portion 20 is provided at one end of the lever main bodies 22a, 22b.
Rollers 23a, 23b that can come into contact with a, 20b
is provided. Here, these rollers 2
It should be noted that the areas in which the contact ends 24a, 24b of the extensions 20a, 20b of the cam arms 13a, 13b can come into contact with each other are quite wide. In other words, this rather wide abutment end 24
As long as the cam arm 13aq13b, that is, the reversing cylinder is stopped in the regions a and 24b, the switching device of the present invention can function satisfactorily. Also, roller 2
A cam roller 25 is installed at a location different from 3a and 23b.
a, 25b are provided, and are always in contact with release scams 26a, 26b of a release means, which will be described later. The lever bodies 22a and 22b have one end connected to the side wall 1.
It is biased by springs 28a, 28b whose other ends are pressed against the ends of the lever bodies 22a, 22b, and this biasing direction is ,22
b The rollers 23a and 23b at the other end are the cam arm 1
This is the direction away from the contact ends 24a, 24b of 3a, 13b. Therefore, these springs 28
The intermediate lever moves against the support shaft 21 against the forces of a and 28b.
Unless rotated around a, 21b, the rollers 23a, 23b are spaced apart from the contact ends 24a, 24b.

The release means applies torque to this intermediate lever, and acts on the two types of cam arms 13a and 13b simultaneously and simultaneously through this intermediate lever. The release shaft 29 of the release means runs parallel to the main axis 2 of the reversing cylinder on the side walls 1a, 1b.
It is rotatably installed horizontally between the two, and is rotated by one handle 30 during switching operations. Release cams 26a and 26b are fixed near both left and right ends of the release shaft 29 in correspondence with the cam rollers 25a and 25b of the intermediate lever. Cam rollers 25a, 25b of the intermediate lever are constantly pressed against the cam surfaces of these release cams 26a, 26b by the force of springs 28a, 28b. When the release shaft 29 is rotated by the handle 30 and placed in the ON position as shown in FIGS. 25b is pushed back against the force of springs 28a and 28b, and the intermediate lever is rotated about the support shafts 21a and 21b, so that the intermediate lever acts on the two types of cam arms 13a and 13b. Note that the handle 30 is always connected to the release shaft 29.
The release shaft 29 may be fixed anywhere on the release shaft 29 depending on layout requirements.

Next, the effects of the above embodiment will be explained.

Regardless of whether it is single-sided printing or double-sided printing, during normal operation and during periods of rest when printing is essentially not performed, the handle 30 of the release means is in the OFF position shown by the two-dot chain line in FIGS. 1 and 2. Yes, therefore,
The release cams 26a, 26b of the release shaft 29 integrated with the handle 30 have their valleys in contact with the cam rollers 25a, 25b of the intermediate lever.
Therefore, the intermediate lever has springs 28a and 28b.
remains rotated counterclockwise in the drawing by the force of . Therefore, at this time, the rollers 23a and 23b at the other end of the intermediate lever are respectively connected to the cam arm 13.
It is completely separated from the abutting ends 24a, 24b of a, 13b. Therefore, the cam arms 13a, 13b
Therefore, at this time, the cam rollers 1 of the cam arms 13a and 13b
6a, 16b are in contact with one of the cam surfaces of the control cams 7a, 7b under the pressure of a spring (not shown). And these control cams 7a,
Under the command of 7b, cam arms 13a, 13b
is operated integrally with the arm shaft 6 or at a timing centered thereon, and acts on the swing claw 10 and the fixed claw 9 to open and close the gripper.

When it finally becomes necessary to switch between single-sided printing and double-sided printing, the reversing cylinder must first be stopped in the relative positional relationship shown in FIGS. 1 and 2. That is, the contact ends 24a, 24b of the cam arms 13a, 13b are connected to the roller 2 of the intermediate lever.
3a and 23b in such a positional relationship that they can come into contact with each other. One of the features of the present device is that this contactable area is wide, and it is of course possible to add mechanical or electrical display means to this contactable area so that the angle of the reversing cylinder is determined.

When the cam arms 13a, 13b and the intermediate lever are ready for interlocking operation, turn the handle 30.
Turn from the OFF position to the ON position as shown.
The advantage of operating the handle 30 in this way is that not only does it require less force to be exerted, but it also allows the cam arms 13a and 13b, which are located on both sides of the printing press, to be actuated centrally and simultaneously on one side of the printing press. This is something that can be affected. That is, the rotation of the handle 30 rotates the release shaft 29 installed horizontally between the side walls 1a and 1b, causing the release cams 26a and 26b provided at both ends to come into contact with the cam rollers 25a and 25b from their valleys to their peaks. Change position.
As a result, the intermediate lever is moved by the springs 28a, 2
8b, the support shafts 21a, 21b, respectively.
The rollers 23a, 23b
acts on the cam arms 13a, 13b. At this time, the cam arms 13a and 13b rotate together with the arm shaft 6 or around the arm shaft 6, respectively. Then, the roller support members 15a, 15b on the opposite side of the abutment ends 24a, 24b with respect to the arm shaft 6, and the cam roller 16
a, 16b resist the force of a spring (not shown) and separate from the cam surface of either control cam 7a, 7b that they were in contact with, respectively, and the biasing force of the spring can be cut off at this point.

When the spring force urging the cam arms 13a, 13b is cut off, the cam rollers 16a, 16
It will be immediately obvious that the movement of item b can be carried out completely freely, so to speak, without the presence of demons. That is, the roller support members 15a, 1 are assembled using a completely ordinary tool 31 as shown by the two-dot chain line.
5b, loosen the clamping screws 17a, 17b, thereby loosening the slots that sandwich the roller support members 15a, 15b, and then move the roller support members 15a, 15b parallel to the arm shaft 6 as shown in FIG. Shift the control cams 7a and 7b to the left or right.
The cam rollers 16a and 16b can come into contact with another cam surface of the cam surface. After doing so, the tightening screws 17a and 17b are tightened again using the tool 31, and these series of loosening, moving, and re-tightening operations are extremely easy and are not affected by other forces. Moreover, I would like you to pay maximum attention to the fact that it can be done extremely easily and in a short time using ordinary tools.

To restore the cam arms 13a, 13b, which are the gripper opening/closing means, for actual printing work, it is sufficient to simply return the handle 30 to its original OFF position. Then, the valleys of the release cams 26a, 26b of the release shaft 29 come into contact with the cam rollers 25a, 25b of the intermediate lever. As a result, the intermediate lever rotates around the support shafts 21a, 21b by the springs 28a, 28b, and as a result, the rollers 23a, 23b move around the cam arm 13.
apart from the abutting ends 24a, 24b of a, 13b,
No release force acts on the cam arms 13a, 13b at all. If this happens, the cam arms 13a and 13b, which are the gripper opening/closing means,
Returning to the influence of the force of a spring (not shown), the cam rollers 16a, 16b are strongly pressed against the control cams 7a, 7b. With this, the cam roller switching work of the gripper for single-sided printing and double-sided printing is completed smoothly.

As can be understood from the above, according to the reversing gripper switching device according to the present invention, firstly, the gripper opening/closing means is released centrally by operating the handle, so the switching operation is extremely simplified. can be done. Second, since the cam roller is moved under no load after the gripper opening/closing means is completely released, there is no deformation or distortion of the cam roller, roller support means, or even the cam arm. . Third, the work can be easily carried out without requiring any special tools or high skill and attentiveness. Finally, the stop range of the reversing cylinder that enables switching operations is extremely wide, which makes the device very useful in single-sided/duplex printing presses.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a switching device for a reversing gripper according to the present invention, and FIG. 2 is a side view seen from the direction of the arrow in FIG. 4, and FIG. 3 is a plan view of the switching device according to the present invention, and FIG. 4 is a cross-sectional explanatory view showing the gripper device of the reversing cylinder in plan view. 1a, 1b...Side wall, 2...Main shaft, 3a, 3b
... Bearing, 4a, 4b ... Shoulder, 5 ... Claw shaft, 6
...Arm shaft, 7a, 7b...Control cam, 8a,
8b... Bearing, 9... Fixed claw, 10... Swinging claw,
11... Bar, 12a, 12b... Bearing, 13
a, 13b...cam arm, 15a, 15b...
Roller support member, 16a, 16b...Cam roller, 17a, 17b...Tightening screw, 18...Bearing, 20a, 20b...Extending portion, 21a, 21b
... Support shaft, 22a, 22b ... Lever body, 23
a, 23b...roller, 24a, 24b...contact end, 25a, 25b...cam roller, 26
a, 26b...Release scum, 28a, 28b...
...Spring, 29...Release shaft, 30...Handle.

Claims (1)

[Claims for Utility Model Registration] 1. Transferring the leading edge or trailing edge of a sheet from the leading edge gripper or trailing edge gripper of a double-diameter transfer cylinder to the reversing gripper of a reversing cylinder, and transferring the sheet as it is.
Or, in a single-sided/double-sided printing machine that reverses the image as the reversing cylinder rotates and sends it to the next printing unit, in combination with a fixed pawl and a swinging pawl provided on a pawl shaft rotatably supported on the reversing cylinder. Therefore, a reversing gripper is configured, and in order to control the gripping motion of these reversing grippers depending on whether it is single-sided printing or double-sided printing, two types of control cams, one for one-sided printing and one for double-sided printing, are arranged in a pair in parallel. and fixed to the left and right side walls of the fuselage as fixed claws and swinging claws, respectively, coaxially with the main shaft of the reversing barrel, and integrally with or centered on an arm shaft rotatably attached to the reversing barrel. Two types of cam arms are provided, one for a fixed claw and one for a swinging claw, which rotate to cause the reversing gripper to open and close, and selectively contact the control cam under a pressing force to respond to the cam surface. The cam roller support member is fastened to one end of these cam arms so as to be movable in the axial direction, and the two types of cam arms have an extending portion on the side opposite to the roller support member with respect to the arm axis, and It has an intermediate lever that is rotatably attached to the side wall and has one end that can come into contact with the extension but is normally biased away from the extension. At the time of switching, this intermediate lever is rotated against the biasing force, thereby rotating the two types of cam arms against the force that was pressing the cam roller against the control cam, thereby separating the cam roller from the control cam. A switching device for a reversing gripper, characterized in that it is provided with a release means for releasing the gripper. 2. In the switching device for a reversing gripper as described in claim 1 of the utility model registration claim, the intermediate lever has a lever main body rotatably supported on a side wall by a support shaft, and one end of which can come into contact with the extension of the cam arm. and a cam roller in contact with the release cam of the release means at another location, the roller being biased by a biasing spring in a direction away from the extending portion of the cam arm. something that is characterized by 3. In the switching device for a reversing gripper according to claim 1 or 2 of the utility model registration claim, the release means includes: a release shaft rotatably mounted between side walls parallel to the main axis of the reversing cylinder; and the release shaft. and a release cam that is fixed to a release shaft and contacts a cam roller of the intermediate lever to rotate the intermediate lever.