JP2571597Y2 - Press pressure adjusting device for printing equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press pressure adjusting device for a printing device, and more particularly to a press pressure adjusting device used for a rotary stencil printing device.

[0002]

2. Description of the Related Art A rotary stencil printing apparatus is configured to perform stencil printing by pressing a printing sheet by a press roller against a cylindrical plate cylinder having a stencil sheet wound around an outer peripheral surface thereof. In a stencil printing apparatus, the printing density is determined by the pressing pressure of the printing paper against the plate cylinder by a press roller, that is, the pressing pressure.

[0003] The press pressure of the press roller can be variably set in order to adjust the printing density, and a press pressure adjusting device for this purpose is incorporated in a stencil printing apparatus.

In a press pressure adjusting device, a press roller is movably supported by a fixed member by a press roller support member, the press roller support member is pivotally connected to a first link member, and the first link member is a spring member. The second link member is reciprocated in a direction in which the press roller separates and comes into contact with the outer peripheral surface of the plate cylinder in synchronization with the rotation of the plate cylinder. The press roller together with the roller support member is configured to move between a retracted position separated from the outer peripheral surface of the plate cylinder and a press operation position pressed by the spring force of the spring member against the outer peripheral surface of the plate cylinder. In the stencil printing machine, the adjustment of the spring member to the first link member is performed by an adjusting screw. That it is configured to change the mounting load of the spring member is known by attachment length of the spring member by screwing position adjustment for Interview nut member is changed.

The above-mentioned adjusting screw is provided with the adjusting screw so that the printing density can be adjusted during the normal operation of the stencil printing machine, in other words, during the rotation of the printing cylinder. Is configured to be driven by an electric motor mounted on the first link.

[0006]

The above-mentioned press pressure adjusting device achieves the intended purpose, but an electric motor for rotating the nut member of the adjusting screw is mounted on the first link. Therefore, the mass of the reciprocating drive system synchronized with the plate cylinder rotation of the press roller including the first link increases, and accordingly, the inertial force of the reciprocal drive system increases, which is caused during the operation of the stencil printing apparatus. This is a major cause of increasing mechanical vibration and noise in the stencil printing machine, and this is an obstacle to high-speed operation of the stencil printing machine.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional press pressure adjusting device. The present invention is applicable to the rotation of the press roller plate cylinder without impairing the original function of the press pressure adjusting device. An object of the present invention is to provide a press pressure adjusting device capable of reducing the mechanical vibration and noise during operation by reducing the mass of a synchronized reciprocating drive system and promoting the high-speed operation of a printing apparatus.

[0008]

According to the present invention, a press roller is movably supported by a fixed member by a press roller support member, and the press roller support member pivots with a first link member. Connected, the first link member is connected to a second link member via a spring member, and the second link member separates the press roller from the outer peripheral surface of the plate cylinder in synchronization with rotation of the plate cylinder. The reciprocating movement of the press roller together with the press roller support member causes the press roller to be pressed against the retracted position separated from the outer peripheral surface of the plate cylinder and the outer peripheral surface of the plate cylinder by the spring force of the spring member. In a press pressure adjusting device of a printing apparatus configured to move between an operation position and an operating position, one end of the spring member is movably engaged with the first link member in an axial direction. An adjusting screw that is attached to one link member so that the mounting length can be changed, a gear-shaped nut member that is screwed to the adjusting screw and has external teeth, an electric motor disposed on a fixed member, and an output shaft of the electric motor And a drive gear that meshes with the external teeth of the nut member to rotate the nut member, and the external teeth of the nut member and the drive gear are displaced from each other in the reciprocating direction of the first link member. This is achieved by a press pressure adjusting device of the printing device, characterized in that it is meshed as much as possible.

[0009]

According to the above construction, since the external teeth of the nut member and the drive gear mesh with each other so as to be displaceable in the reciprocating direction of the first link member, they are synchronized with the plate cylinder rotation of the press roller. Regardless of the reciprocating motion, the rotational power of the electric motor is transmitted to the nut member in any state regardless of the reciprocating motion, and the adjusting screw moves in the axial direction. , The mass of the reciprocating drive system of the press roller is reduced.

[0010]

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

FIGS. 1 to 3 show an embodiment in which the press pressure adjusting apparatus according to the present invention is applied to a rotary stencil printing apparatus.

In these figures, reference numeral 1 denotes a cylindrical plate cylinder. The plate cylinder 1 is made of an ink-permeable material such as a perforated metal plate, a mesh structure, or the like. A stencil sheet (not shown) is wrapped around the outer peripheral surface of the plate cylinder 1, and the plate cylinder 1 is driven by plate cylinder rotation driving means (not shown). 1 is rotated clockwise in FIG. 1 around the central axis of the printing paper, and the printing paper (not shown) is pressed against the stencil sheet on the outer peripheral surface of the plate cylinder by the press roller 3 in the rotating state.
Stencil printing is performed on the printing paper.

The press roller 3 extends in the axial direction of the plate cylinder 1 and is supported by a bracket 5 so as to be rotatable around its own central axis. The bracket 5 is a frame 7 (FIG. 2 and FIG. 3) is fixedly connected to a press shaft 9 rotatably supported. Thereby, the press roller 3 can be swingably displaced in a substantially vertical direction about the press shaft 9, and is pressed against the retracted position separated from the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the plate cylinder 1. It can move between the position.

A press drive lever 11 is fixedly mounted on the press shaft 9, and the press shaft 9 is
Is rotatably supported.

A hook member 17 is rotatably attached to the press drive plate 13 by a pivot 15. The hook member 17 is connected to the solenoid 1 mounted on the press drive plate 13.
The press drive lever 11 and the press drive lever 13 are selectively engaged with the press drive lever 11 to drive-connect the press drive lever 11 and the press drive plate 13 to each other.

One end of a first link member 23 is pivotally connected to an end of the press driving plate 13 by a pivot 21. The first link member 23 has two long holes 25 formed in the same direction at two places, and the pins 29 of the second link member 27 are engaged with the long holes 25. Thereby, the first link member 23
The second link member 27 and the second link member 27 are connected to each other so as to be displaceable in the link direction within the range of the elongated hole 25, that is, substantially in the vertical direction in FIG.

At the lower end of the first link member 23, a bent flange piece 31 is provided.
The adjusting screw 33 penetrates the first link member 23 so as to be movable in the reciprocating direction. A spur gear-shaped nut member 49 having external teeth 50 and receiving a thrust through a collar 34 is screwed into the adjusting screw 33 via a collar 34 at a position below the bent flange piece 31. One end of a tension coil spring 35 is locked to the upper end of the coil 33.

The adjusting screw 33 is prevented from rotating by locking one end of a tension coil spring 35 to the adjusting screw 33, and the first link member 23 is rotated by rotation of the nut member 49.
Move in the axial direction with respect to.

The tension coil spring 35 has a pin 29 at the other end.
And the first link member 23 is connected to the second link member 27.
1, in other words, the press drive plate 13 is urged around the press shaft 9 in a counterclockwise direction in FIG. 1, in other words, in a direction in which the press roller 3 is pressed against the outer peripheral surface of the plate cylinder 1. doing.

The second link member 27 has a pivot 37 at its upper end.
Thus, it is pivotally connected to the tip of the cam lever 39.
The cam lever 39 is rotatably supported by the support shaft 41 from the frame 7, and rotatably supports the cam follower roller 43 at the distal end by the pivot shaft 37. The cam follower roller 43 includes a press cam 47 attached to a main shaft 45.
Is engaged. The press cam 47 rotates clockwise in FIG. 1 in synchronization with the rotation of the plate cylinder 1, and a stencil clamp (not shown) provided on the outer peripheral portion of the plate cylinder 1 corresponds to the press roller 3. When located in the rotation position,
In order to avoid interference between the press roller 3 and the stencil sheet clamp portion, a cam profile for positioning the press roller 3 at the retracted position is provided.

A motor mount bracket 51 is fixedly mounted on the frame 7, and a motor mount plate 53 is mounted on the motor mount bracket 51 so as to be rotatable about a pivot 55. A motor 57 for adjusting press pressure is attached to the motor mount plate 53, and a drive gear 61 is fixedly mounted on an output shaft 59 of the motor 57 for adjusting press pressure. The drive gear 61 is configured such that the motor mount plate 53 is urged counterclockwise in FIG. 2 around the pivot 55 with respect to the motor mount bracket 51 by the torsion spring 63 so that the external teeth 50 of the nut member 49 are formed.
And a spur gear having an axial length approximately equal to the sum of the reciprocating stroke of the first link member 23 by the press cam 47 and the maximum axial movement length of the adjusting screw 33. In the axial direction of the adjusting screw 33, that is, the first link member 2
3 so as to be relatively displaceable in the reciprocating direction.

A solenoid 65 is attached to the motor mount bracket 51, and a plunger 67 of the solenoid 65 is connected to the motor mount plate 5 by a link member 69.
3 is drivingly connected to the fixing pin 71. Solenoid 6
5 attracts the plunger 67 to the left in FIG. 3 by being energized and energized, whereby the motor mounting plate 5
2 is rotated clockwise in FIG. 2 against the motor mount bracket 51 around the pivot 55 against the spring force of the torsion spring 63, and the driving gear 61 is engaged with the external teeth 50 of the nut member 49. They are forced to leave.

The first link member 23 is provided with a press pressure detecting volume device 73. The press pressure detecting volume device 73 connects the mover 75 to the adjusting screw 33, and detects the effective mounting length of the tension coil spring 35 from the screwing position of the adjusting screw 33.

According to the above-described configuration, the press cam 47 rotates clockwise in FIG. 1 by the clockwise rotation of the plate cylinder 1 in FIG. 1, and the second link member 27 is moved up and down substantially by this rotation. The reciprocating motion is transmitted to the first link member 23 via the extension coil spring 35. The press drive plate 13 reciprocates around the press shaft 9 by the reciprocating motion of the first link member 23, and at this time, the hook member 17 is moved to the engagement position by the solenoid 19 and engages with the press drive lever 11. As a result, the reciprocating rotation of the press drive plate 13 is transmitted to the press shaft 9, and the reciprocating rotation of the press shaft 9 causes the press roller 3 to oscillate and displace substantially vertically about the press shaft 9, thereby causing the plate cylinder to move. 1 is moved between a retracted position separated from the outer peripheral surface of the plate cylinder 1 and a pressing operation position pressed against the outer peripheral surface of the plate cylinder 1.

At this time, the movement of the press roller 3 to the pressing operation position is performed by raising the second link member 27 and transmitting this movement to the first link member 23 while applying a tensile force to the tension coil spring 35, Drive plate 13 is press shaft 9
1 is rotated counterclockwise in FIG. 1 so that the press roller 3
1 around the press shaft 9 of the press drive plate 13 by being pressed against the outer peripheral surface of the press drive plate 13, the rotation in the counterclockwise direction is restricted, and the second link member 27 is still pulled up from this state. Thereby, the second link member 27 is displaced with respect to the first link member 23, and the extension coil spring 35 is extended. As a result, the press roller 3 is pressed against the outer peripheral surface of the plate cylinder 1 across the printing paper by the spring force due to the extension of the extension coil spring 35, and the press pressure is determined by the spring force.

In adjusting the print density, the driving gear 61 is rotated by driving the motor 57 for adjusting the press pressure. The rotation of the drive gear 61 is transmitted to the nut member 49, and the rotation of the nut member 49 causes the adjusting screw 33 to move in the axial direction with respect to the first link member 23, and the axial position of the adjusting screw 33 with respect to the first link member 23. Changes. As a result, the locking portion between the tension coil spring 35 and the adjusting screw 33 is displaced in the axial direction with respect to the first link member 23.
The mounting length of No. 5 changes, and the mounting load changes.

Due to the change in the mounting load of the tension coil spring 35, the press roller 3 is moved under the action as described
The pressure applied to the outer peripheral surface, ie, the press pressure changes, and the print density changes accordingly.

The driving of the adjusting screw 33 in the axial direction by the press pressure adjusting motor 57 is performed by the engagement of the driving gear 61 with the external teeth 50 of the nut member 49, and the driving gear 61 is connected to the first link by the press cam 47. The first link member 23 is reciprocated with respect to the external teeth 50 of the nut member 49 by a spur gear having an axial length of about the sum of the reciprocating stroke of the member 23 and the maximum axial movement length of the adjusting screw 33. Since the first link member 23 is reciprocated by the press cam 47, the adjusting screw rotary gear 49 maintains the meshing state with the drive gear 61 in the tooth width direction as the press cam 47 reciprocates. When the first link member 23 is in any reciprocating position, the driving teeth 61 and the external teeth 50 of the nut member 49 are displaced along the tooth trace. Meshed state is maintained for.

Thus, in any state during the printing operation, the rotational power of the press pressure adjusting motor 57 is transmitted to the nut member 49, and the adjusting screw 33 moves in the axial direction to adjust the printing density. You will get.

Note that the first link member 23 is
In addition to the purely linear reciprocating motion, when the reciprocating motion is performed by the lever 7, the nut member 49 slightly moves laterally in the left-right direction in FIG. The driving gear 61 is urged in the direction of meshing with the external teeth 50 of the nut member 49 by the spring force of the torsion spring 63, so that the driving gear 61 meshes with the external teeth 50 of the nut member 49. Is maintained.

The press pressure adjusting motor 57 is mounted on the frame 7 which is a fixed member, and is separated from the first link member 23, that is, the reciprocating drive system of the press roller 3. The mass of the drive system is reduced, and the pre-roller drive load is reduced.

Since the adjusting screw 33 is not driven in the axial direction except when adjusting the print density, the driving gear 61 may be disengaged from the engagement with the external teeth 509 of the nut member 49, and at this time, the solenoid 65 is energized. The motor mount plate 53 is rotated by the solenoid 65 in the clockwise direction in FIG. 2 against the motor mount bracket 51 around the pivot 55 against the spring force of the torsion spring 63, and the drive gear 61 is rotated by the nut. The member 49 is forcibly released from the engagement with the external teeth 50. When the engagement between the external teeth 50 of the nut member 49 and the driving gear 61 is released, the external teeth 50 of the nut member 49 associated with the reciprocating motion of the first link member 23.
Rubbing of the tooth surfaces of the gears and the drive gear 61 is avoided, the durability of these gears is improved, the power required for the reciprocating motion of the first link member 23 is reduced, and the driving load of the press roller is further reduced. Is done.

Incidentally, the forced release of the drive gear 61 by the solenoid 65 as described above is not always necessary in the press pressure adjusting device according to the present invention, and is omitted as shown in FIG. You may.

[0034]

As can be understood from the above description, according to the press pressure adjusting device of the printing apparatus according to the present invention, the external teeth of the nut member and the drive gear can be displaced in the reciprocating direction of the first link member with respect to each other. In any state, regardless of the reciprocating motion synchronized with the plate cylinder rotation of the press roller, the rotational power of the electric motor is transmitted to the nut member, and the adjusting screw moves in the axial direction. Since it is mounted on the fixed side member and is mass separated from the reciprocating drive system of the press roller, the mass of the reciprocating drive system of the press roller is reduced, without impairing the original function of the press pressure adjusting device. The effect of reducing mechanical vibration and noise during operation can be obtained, and the high-speed operation of the printing apparatus can be promoted.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment in which a press pressure adjusting device according to the present invention is applied to a rotary stencil printing machine.

FIG. 2 is a plan view of an adjusting screw part in the press pressure adjusting device according to the present invention.

FIG. 3 is a side view of an adjusting screw portion in the press pressure adjusting device according to the present invention.

FIG. 4 is a plan view of an adjusting screw driving part in another embodiment of the press pressure adjusting device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 plate cylinder 3 press roller 5 bracket 9 press shaft 13 press drive plate 11 press drive lever 17 hook member 23 first link member 27 second link member 33 adjusting screw 35 tension coil spring 39 cam lever 47 press cam 49 nut member 50 external teeth 57 Press pressure adjusting motor 61 Drive gear 65 Solenoid

Claims (1)

(57) [Scope of request for utility model registration] A press roller is movably supported by a fixed-side member by a press roller support member, the press roller support member is pivotally connected to a first link member, and the first link member is connected to a second link member via a spring member. Linked with the link member,
The second link member reciprocates in a direction in which the press roller is separated from and brought into contact with the outer peripheral surface of the plate cylinder in synchronization with the rotation of the plate cylinder. A press pressure adjusting device for a printing apparatus configured to move between a retracted position separated from an outer peripheral surface and a press operation position pressed against the outer peripheral surface of the plate cylinder by the spring force of the spring member. An adjusting screw that movably engages with the first link member in the axial direction and locks one end of the spring member with the first link member so that the mounting length can be changed; A gear-shaped nut member having teeth,
A motor disposed on the stationary member, and a drive gear attached to an output shaft of the motor and meshing with external teeth of the nut member to rotationally drive the nut member; The press pressure adjusting device for a printing apparatus, wherein the gear is meshed with the gear so as to be displaceable in the reciprocating direction of the first link member.