JPS625345Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a seat body locking structure for removably locking a seat body to a sheet body supporting object,
In particular, the present invention relates to a stencil sheet locking device that locks a stencil sheet to a rotary press drum of a rotary mimeograph machine.

For example, when removably locking one end of a stencil sheet to the drum of a rotary press, a locking device for locking the sheet body is provided on one object, and an engaging opening is provided on the side of the sheet body, and these It is conventional practice to engage the locking device and the engagement opening with each other. Various types of locking structures including such locking devices and engagement openings have already been proposed and used.

One of these known locking structures includes a columnar body that projects above the object to which the seat body is attached;
a hole formed in the sheet body to have a contour corresponding to the cross-sectional shape of the columnar body, and by engaging the sheet body with the columnar body at the hole portion, the sheet body carrying object and the sheet body are separated. The connection between the two is now being made. Such a sheet body locking structure does not cause any deformation around the hole in the sheet body by simply seating the sheet body on the sheet body supporting object by inserting the columnar body into the hole formed in the sheet body. The sheet body is attached to the sheet body carrying object so as not to cause any relative displacement in the direction along the surface of the sheet body between the sheet body carrying object and the sheet body after the sheet body is attached. However, in this case, the hole in the sheet body can move freely in the direction along the axis of the columnar body, so the hole in the sheet body can be inadvertently dislodged from the columnar body. However, there is a drawback that the sheet body is more likely to fall off than the sheet body supporting object.

In view of the above-mentioned drawbacks of the seat body locking structure based on the simple engagement between a columnar body and a hole,
The columnar body protruding from the sheet-carrying object is provided with a head larger than the diameter of the columnar part, and the hole provided in the sheet body is a hole with a size approximately equal to the diameter of the columnar part, and the hole is filled with the above-mentioned head. When passing through the headed column, the head causes a semi-elastic and semi-plastic deformation around the hole in the sheet body, and once the head passes through the hole in the sheet body, the sheet deforms. A locking structure that makes it more difficult for the hole in the body to fall off than the headed columnar body has been proposed and used as another sheet body locking structure. Such a second sheet body locking structure has the advantage that once the sheet body is locked as described above, the risk of the sheet body inadvertently falling off from the sheet body supporting object is greatly reduced. In this case, since the sheet body is three-dimensionally elastically and plastically deformed at the peripheral edge of the hole, the deformation resistance is quite large, and the operation of locking the sheet body to the sheet body supporting object is quite troublesome. Furthermore, since the sheet body is three-dimensionally plastically deformed around the hole, there is a risk that the sheet body will become weakened at the peripheral edge of the hole and breakage of the sheet body will occur from that area.

Furthermore, as a third known locking structure, a columnar body with a head is used as the locking device provided on the sheet supporting object side as in the second locking structure,
On the other hand, a portion of the hole provided in the sheet body is large enough to allow the head of the headed columnar body to pass through easily, and a columnar portion of the headed columnar body is connected to one side of the hole. The large diameter part of the keyhole-shaped hole is configured as a keyhole-shaped hole including a notch groove with a width that exactly engages with the sheet body, and when the sheet body is locked to the sheet body supporting object, the large diameter part of the keyhole-shaped hole The small diameter portion of the keyhole-like hole is engaged with the columnar portion of the headed columnar body by slightly displacing the sheet body along its surface relative to the sheet-carrying object, and this Accordingly, there is a device in which the small diameter portion of the hole is engaged with the jaw portion of the head of the headed columnar body to prevent the sheet body from accidentally falling off from the sheet body supporting object. Such a locking structure has the advantage of being able to more reliably lock the sheet body to the object supporting the sheet body without causing any deformation of the sheet body during the locking operation. In operation, it is necessary to displace the sheet body relative to the sheet-carrying object in a direction along its surface, and in some cases, such an operation makes the work of attaching the sheet body to the sheet-carrying object quite complicated. This causes a problem.

In view of the above-mentioned problems in the various known sheet body locking structures, the present invention has been developed to simply bring the sheet body close to the sheet body supporting object without causing three-dimensional deformation of the sheet body. Alternatively, by performing a simple operation of pulling the sheet body away from the object, it is possible to lock the sheet body to or detach it from the sheet body supporting object, and by such a simple operation, the sheet body Once the sheet body is locked to an object, it strongly prevents the sheet body from accidentally falling off from the sheet-carrying object, and when the sheet body is locked, the sheet body follows the surface of the sheet-carrying object. The object of the present invention is to provide an improved sheet locking structure, which can completely eliminate play such as directional displacement, especially as a stencil sheet locking device for a rotary mimeograph printing machine.

This purpose, according to the present invention, includes two columnar portions that are juxtaposed and substantially parallel to each other and protrude from the stencil sheet mounting portion of the rotary press drum, and a bridge portion that connects the protruding ends of the columnar portions to each other. the stencil sheet by engaging an engagement opening formed in the reinforcing portion of the stencil sheet and including two holes that engage the two columnar portions and a slit extending between these holes. A stencil sheet locking device for holding the stencil sheet, and the engagement of the stencil sheet engaging device with the engagement opening is such that the bridge portion is aligned with the slit and a portion of the reinforcing portion along the slit is aligned with the central axis of the slit. This is achieved by a stencil sheet locking device for a rotary copying machine characterized in that the stencil sheet locking device passes through the engagement opening while bending the sheet in parallel.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

The attached FIG. 1 is a plan view showing the locking part of the stencil sheet with respect to the drum in a rotary press incorporating one embodiment of the sheet body locking structure based on the present invention, and FIG. FIG. In these figures, 1 is a drum of a rotary press, and 2 is a stencil sheet attached to the drum. Drum 1 is seat mounting part 3
In this embodiment, two types of seat locking devices 4 and 5 are provided as seat locking devices in the seat mounting portion. Of these seat locking devices, 4 in particular is relevant to the present invention; the other type of seat locking device 5 is simply a cylindrical portion protruding substantially perpendicularly to the surface of the seat mounting portion 3. It is. The seat 2 has along one edge thereof a reinforcement 6 which is provided with engagement openings 7 and 8 which correspond to and engage the seat locking devices 4 and 5. In this case too, the engagement opening 8 that engages the seat locking device 5 is simply a circular hole with a diameter that just engages the cylindrical surface of the seat locking device 5.

3 is a side view showing one basic embodiment of the seat locking device 4, FIG. 4 is a plan view thereof as seen in the direction of the arrow in FIG. 3, and FIG. FIG. As is clear from these figures, the seat locking device 4 is a U-shaped element having two columnar portions 9 projecting from the seat attachment portion 3 and a bridge portion 10 connecting one end of the columnar portions to each other. be. In the embodiment shown in FIGS. 3 to 5, the columnar portion 9 and the bridge portion 10 are both configured to have a circular cross section.

FIG. 6 shows one basic embodiment of an engagement opening 7 formed in the reinforcement 6 of the stencil sheet 2 for engaging the sheet locking device shown in FIGS. 3-5. This engagement opening includes a hole 11 that engages with the two pillars 9 of the sheet locking device 4 and a slit 12 that extends between these holes. In the embodiment shown in FIG. 6, the hole 11 is formed in accordance with the fact that the columnar portion 9 of the sheet locking device 4 shown in FIGS. 3 to 5 is configured to have a circular cross section. Preferably, it is configured as a circular hole, the diameter of which is equal to or slightly larger than the diameter of the columnar portion 9.

To attach the stencil sheet 2 having the engagement opening 7 shown in FIG. 6 to the drum 1 of a rotary press having the sheet locking device 4 shown in FIGS. 3 to 5,
The reinforcing part 6 of the stencil sheet 2 is attached to the sheet mounting part 3.
The sheets may be stacked on top of each other, and the sheets may be pressed toward the sheet mounting portion around the sheet locking device 4 so that the sheet locking device 4 fits into the engagement opening 7. Due to this sheet pressing action, the sheet locking device 4
The bridge portion 10 has sheet pieces 13 formed on both sides of the slit 12 of the engagement opening 7.
It pushes open and enters the pushed-open part. In this case, the sheet pieces 13 are straight lines 14, 15, 1, respectively.
It curves two-dimensionally along a straight line of magnitude 6. When the flat sheet piece 13 is curved two-dimensionally along a straight line in this way, no three-dimensional plastic deformation occurs in the sheet piece, and the sheet piece is simply two-dimensionally and almost Deforms elastically. Therefore, under the temporary deformation of the sheet piece 13, the sheet locking device 4
When the bridge portion 10 of the sheet passes between them, the sheet piece 13 is able to return to its original position again due to its elasticity, and thus after the engaging opening 7 has engaged with the sheet locking device 4. In this case, the seat is simply engaged with the columnar part 9 of the seat locking device at the hole 11 thereof. In this state, the sheet piece 13 resists the force that tries to pull the sheet 2 away from the locking device 4 due to its own elasticity, and the sheet is supported by a sheet carrier such as a drum 1. Prevents careless removal from the device. Furthermore, the peripheral edge of the hole 11 engages with the columnar part 9 to resist tensile forces in all directions along the sheet surface, and the sheet is stably held regardless of the tensile force.

FIG. 7 is a view corresponding to FIG. 5 showing one modification of the seat locking device shown in FIGS. 3 to 5. FIG. In this modified example, the cross-sectional shape of the bridge portion 10 is modified from the circular shape shown in FIG. 5 to the shape shown in FIG. 7. Bridge part 10
By modifying the shape of the bridge portion 10 as shown in FIG. 7, when a seat having an engagement opening as shown in FIG. sheet piece 1
3 is pushed open smoothly, the sheet can be easily attached, and when the seat once locked is about to be removed from the locking device, the lower surface 10b of the bridge portion 10, which is formed relatively flat, Since an attempt is made to push open the sheet piece 13, the push-opening resistance increases, and therefore, the sheet once locked becomes difficult to come off from the locking device. Normally, once the stencil sheet is attached to the drum of a rotary press, it is not removed until the printing job is completed and the stencil sheet is removed and discarded. The fact that the stencil sheet is easily installed and its removal is more difficult than the installation process means that the sheet is easy to install and there is less risk of the sheet being inadvertently dropped from the sheet carrier during use. This is an advantage.

FIG. 8 is a view similar to FIG. 6 showing one modification of the engagement opening 7 of the seat shown in FIG. 6. In this modified example, the width of the slit 12 is increased. By increasing the width of the slit 12 in this manner, the seat can be more easily attached to the seat locking device. However, in this case, the seat will also become more easily detached from the seat locking device, but if the degree of detachment is such that it does not pose a problem when the seat is actually used, the seat should not be attached. It is generally advantageous to increase the width of the slit 12 in this way for the purpose of making it easier.

FIG. 9 is a view similar to FIG. 6 or 8 showing yet another modification of the engagement opening of the seat.
In this modified example, the width of the slit 12 changes along its length, being narrowest at the center of its length and gradually increasing in width as it goes further away from the center, forming a circular hole. It is configured to smoothly connect to 11. In this case, the slit 12
As in the embodiment shown in FIG. 6 or 8, the sheet pieces 13 formed on both sides of the locking device gradually curve along a straight line from the center as the bridge portion 10 of the locking device enters. It curves two-dimensionally more smoothly while expanding its width, and at this time, no three-dimensional plastic deformation occurs.

10, 11, and 12 are views similar to FIG. 6 showing other embodiments of the engagement opening provided in the seat. In the embodiment shown in FIG. 10, the holes that engage with the two columnar parts of the locking device are elliptical in shape, so in this case, the holes that engage with the two columnar parts of the locking device are is a columnar portion having an elliptical cross section. In the embodiment of FIG. 11, the hole which engages the columnar portion of the locking device is square shaped with two sides parallel to the slit extending therebetween as shown. A locking device to be used with a sheet having such an engagement aperture will naturally have a column with a corresponding square cross-section. In the embodiment shown in FIG.
The two holes which engage the two posts of the locking device are square shaped with four sides inclined at 45 DEG to the slit extending between them. A locking device used with a sheet having such an engagement opening has two columnar sections each having a square cross section, and each of the two columnar sections is arranged in such a manner that one ridge side faces each other. It is.

FIG. 13 is a perspective view showing yet another embodiment of the sheet locking device and the engagement opening of the sheet that engages with the sheet locking device. In this embodiment, one column 18 of the locking device 17 is configured as a column with a square cross section, and the other column 18 is configured as a column with a square cross section.
9 is configured as a columnar part having a circular cross section,
The bridge portion 20 connecting these upper ends to each other is configured to have a substantially triangular cross section. Corresponding to such a configuration of the locking device, the seat 2
The engaging opening 21 formed in the opening 21 is configured to include a square hole 22, a circular hole 23, and a slit 24 extending therebetween. When the cross-sectional shapes of the two columnar parts in the locking device are configured to be different from each other or asymmetrical to each other in this way, it is possible to accidentally turn the sheet upside down and attach it to the sheet carrier. This has the advantage that such erroneous operations can be reliably prevented from occurring.

[Brief explanation of the drawing]

FIG. 1 is an illustrative plan view showing the locking portion of a stencil sheet to the drum of a rotary press incorporating one embodiment of the sheet body locking structure based on the present invention;
The figure is a sectional view taken along the line - in Fig. 1, Fig. 3 is a side view of the seat locking device incorporated in Figs. 1 and 2, and Fig. 4 is the locking device taken along the arrow - in Fig. 3. 5 is a sectional view taken along the line - in FIG. 3, FIG. 6 is a plan view showing the engagement opening of the seat that engages with the locking device shown in FIGS. This figure is a view similar to FIG. 5 showing a modification of the embodiment shown in FIGS. 3 to 5, and FIGS. 8 and 9 are views showing a modification of the seat engagement opening shown in FIG. 6. FIGS. 10, 11, and 12 are views similar to FIG. 6 showing other embodiments of the engagement opening of the seat, and FIG. 13 is a view showing a locking device and the same. FIG. 7 is a perspective view showing yet another embodiment of the engagement opening of the sheet that engages with the seat. 1 ~ rotary press drum, 2 ~ stencil sheet, 3
~ Seat mounting part, 4, 5 ~ Seat locking device, 6 ~
sheet reinforcing part, 7, 8 - sheet opening, 9 - columnar part, 10 - bridge part, 11 - hole, 12 - slit, 13 - sheet piece, 14, 15, 16 - line, 1
7 - Seat locking device, 18, 19 - Columnar part, 20
~ Bridge portion, 21 ~ Seat engagement opening, 22,
23~hole, 24~slit.

Claims (1)

[Scope of utility model registration request] A reinforcing portion of the stencil sheet, comprising two columnar portions protruding from a stencil sheet attachment portion of a rotary press drum in substantially parallel to each other and a bridge portion connecting the protruding ends of the columnar portions to each other. a stencil sheet locking device that holds the stencil sheet by engaging with an engagement opening that is formed in the stencil sheet and includes two holes that engage the two columnar parts and a slit extending between these holes; The engagement of the stencil sheet engagement device with the engagement opening is performed by aligning the bridge portion with the slit and bending the portion of the reinforcing portion along the slit parallel to the central axis of the slit while opening the engagement opening. A stencil sheet locking device for a rotary mimeograph printing machine, characterized in that the locking device is operated in a passing manner.