JPH0616062U - Press pressure adjusting device for printing equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the mechanical vibration and noise during operation by reducing the mass of the reciprocating drive system of the press roller without impairing the original function of the press pressure adjusting device. An adjust screw 33 is movably engaged with the first link member 23 in the axial direction for adjusting a press pressure and one end of a spring member 35 is locked to the first link member 23 so that a mounting length thereof can be changed. The nut member 49 having the outer teeth 50 is attached, and the drive gear 61 attached to the electric motor 57 arranged on the fixed member and the outer teeth 50 of the nut member 49 can be displaced in the reciprocating direction of the first link member 23. Let it mesh.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a press pressure adjusting device for a printing apparatus, and more particularly to a press pressure adjusting device used in a rotary stencil printing device.

[0002]

[Prior art]

 The rotary type stencil printing machine is configured to perform stencil printing by pressing the printing paper with a press roller onto a cylindrical plate cylinder with the stencil paper wrapped around the outer peripheral surface. In addition, the printing density is determined by the pressing pressure of the printing paper against the plate cylinder by the press roller, that is, the pressing pressure.

The press pressure of the press roller can be variably set to adjust the print density, and a press pressure adjusting device for this purpose is incorporated in the stencil printing machine.

In the press pressure adjusting device, a press roller is movably supported by a press roller supporting member from a fixed side member, the press roller supporting member is pivotally connected to a first link member, and the first link member is a spring. The second link member is connected to the second link member via a member, and the second link member reciprocates in the direction of bringing the press roller into and out of contact with the outer peripheral surface of the plate cylinder in synchronization with the rotation of the plate cylinder. And the press roller together with the press roller supporting member move between a retracted position separated from the outer peripheral surface of the plate cylinder and a press action position where the press roller is pressed against the outer peripheral surface of the plate cylinder by the spring force of the spring member. In the stencil printing machine configured as described above, the spring member is locked to the first link member by an adjusting screw. It is known that the mounting load of the spring member is changed by changing the mounting length of the spring member by adjusting the screwing position of the screw to the nut member.

The press pressure adjusting device as described above is arranged 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 plate cylinder. It is known that a nut member of a cast screw is configured to be driven by an electric motor mounted on the first link.

[0006]

[Problems to be solved by the device]

 The press pressure adjusting device as described above achieves the intended purpose.However, since the electric motor for rotationally driving the nut member of the adjusting screw is mounted on the first link, this first link is used. The mass of the reciprocating drive system, which is synchronized with the rotation of the plate cylinder of the press roller including, increases the inertial force of this reciprocating drive system, which causes mechanical vibration during operation of the stencil printing machine. It is a major cause of increased noise, and this is an obstacle to high-speed operation of stencil printing machines.

The present invention has been made by paying attention to the above-mentioned problems in the conventional press pressure adjusting device, and the plate cylinder rotation of the press roller can be performed without impairing the original function of the press pressure adjusting device. It is an object of the present invention to provide a press pressure adjusting device that can reduce the mechanical vibration and noise during operation by reducing the mass of the reciprocating drive system synchronized with the above, and can promote the high speed operation of the printing device.

[0008]

[Means for Solving the Problems]

 According to the present invention, the press roller is movably supported by the press roller supporting member by the fixed side member, and the press roller supporting member is pivotally connected to the first link member. Is connected to a second link member via a spring member, and the second link member reciprocates in a direction in which the press roller is brought into contact with and separated from the outer peripheral surface of the plate cylinder in synchronization with the rotation of the plate cylinder. Between the retracted position in which the press roller together with the press roller supporting member is separated from the outer peripheral surface of the plate cylinder and the press working position in which the press roller is pressed against 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 device configured to move, one end of the spring member is attached to the first link member by movably engaging with the first link member in an axial direction. An adjustable screw that locks variably, a gear-shaped nut member that is screwed to the adjustable screw and has external teeth, an electric motor that is arranged on a fixed member, and the nut that is attached to the output shaft of the electric motor. A driving gear that meshes with the outer teeth of the member to rotationally drive the nut member, and the outer teeth of the nut member and the driving gear mesh with each other so as to be displaceable in the reciprocating direction of the first link member. It is achieved by the press pressure adjusting device of the printing device.

[0009]

[Action]

 According to the above-mentioned structure, since the outer teeth of the nut member and the driving gear mesh with each other so as to be displaceable in the reciprocating direction of the first link member, the reciprocating motion synchronized with the rotation of the plate cylinder of the press roller is performed. Regardless of the condition, the rotating power of the electric motor is transmitted to the nut member to move the adjusting screw in the axial direction under any condition, and the electric motor is mounted on the fixed side member and mass-moved from the reciprocating drive system of the press roller. Since it is separated, the mass of the reciprocating drive system of the press roller is reduced.

[0010]

【Example】

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

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

In the drawings, reference numeral 1 indicates a cylindrical plate cylinder. The plate cylinder 1 is made of an ink-permeable material such as a perforated metal plate and a mesh structure, and is mounted by winding a stencil sheet (not shown) around the outer peripheral surface of the plate cylinder by a plate cylinder rotation driving means (not shown). Printing is performed by rotating the printing paper (not shown) around its own central axis in the clockwise direction in FIG. 1, and pressing the printing paper (not shown) against the stencil sheet on the outer peripheral surface of the plate cylinder by the press roller 3 to perform printing. It is designed to perform stencil printing on 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 about its own center axis. The bracket 5 is a frame 7 (FIG. 2, FIG. (See FIG. 3), it is fixedly connected to the press shaft 9 which is rotatably supported. As a result, the press roller 3 can be oscillated and displaced substantially vertically 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 is movable between the positions.

A press drive lever 11 is fixedly mounted on the press shaft 9, and the press shaft 9 rotatably supports a press drive plate 13.

A hook member 17 is rotatably attached to the press drive plate 13 by a pivot 15, and the hook member 17 is rotationally driven by a solenoid 19 mounted on the press drive plate 13 to drive the press drive. The press drive lever 11 and the press drive plate 13 are drivingly connected to each other by selectively engaging with the lever 11.

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

A bent flange piece 31 is provided at the lower end of the first link member 23, and an adjust screw 33 is movable on the bent flange piece 31 in the reciprocating direction of the first link member 23. Penetrates. The adjusting screw 33 has a spur gear-shaped nut member 49, which has external teeth 50 via a collar 34 and which receives a thrust, at a position below the bending flange portion 31 of the adjusting screw 33. One end of a tension coil spring 35 is locked to the upper end of the screw 33.

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

The tension coil spring 35 is locked to the pin 29 at the other end, and the first link member 23 is positioned above the second link member 27, in other words, the press drive plate 13 is moved around the press shaft 9. In FIG. 1, it is urged in the counterclockwise direction, in other words, in the direction of pressing the press roller 3 against the outer peripheral surface of the plate cylinder 1.

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

A motor mount bracket 51 is fixedly attached to the frame 7, and a motor mount plate 53 is rotatably attached to the motor mount bracket 51 by a pivot 55. A motor 57 for press pressure adjustment is attached to the motor mount plate 53, and a drive gear 61 is fixedly attached to an output shaft 59 of the motor 57 for press pressure adjustment. The drive gear 61 has the outer teeth 50 of the nut member 49 because the motor mount plate 53 is biased by the torsion spring 63 in the counterclockwise direction around the pivot 55 with respect to the motor mount bracket 51 in FIG. The external teeth of the nut member 49 are formed of spur gears that mesh with each other and have a shaft 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. It is meshed with 50 so as to be relatively displaceable in the axial direction of the adjusting screw 33, that is, in the reciprocating direction of the first link member 23.

A solenoid 65 is attached to the motor mount bracket 51, and a plunger 67 of the solenoid 65 is drivingly connected to a fixed pin 71 of the motor mount plate 53 by a link member 69. The solenoid 65 is energized and excited to attract the plunger 67 to the left in FIG. 3, thereby causing the motor mount plate 53 to rotate around the pivot 55 with respect to the motor mount bracket 51 and to generate the spring force of the torsion spring 63. In contrast, the drive gear 61 is forcibly disengaged by meshing with the outer teeth 50 of the nut member 49 by rotating the drive gear 61 clockwise in FIG.

A press pressure detecting volume device 73 is attached to the first link member 23. The press pressure detecting volume device 73 is configured such that the mover 75 is connected to the adjusting screw 33 and the effective mounting length of the tension coil spring 35 is detected from the screwing position of the adjusting screw 33.

According to the configuration as described above, the press cam 47 rotates clockwise in FIG. 1 when the plate cylinder 1 rotates clockwise in FIG. 1, and the second link member 27 is substantially rotated by this rotation. It reciprocates in the vertical direction, and this reciprocation is transmitted to the first link member 23 via the tension coil spring 35. The press drive plate 13 is reciprocally rotated about 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 engaged with the press drive lever 11. As a result, the reciprocal rotation of the press drive plate 13 is transmitted to the press shaft 9, and the reciprocating motion of the press shaft 9 causes the press roller 3 to swing about the press shaft 9 in a substantially vertical direction, thereby causing displacement of the plate cylinder. It moves between the retracted position separated from the outer peripheral surface of 1 and the pressing 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 action position is transmitted to the first link member 23 while pulling up the second link member 27 and applying a tensile force to the tension coil spring 35. The press drive plate 13 is rotated counterclockwise in FIG. 1 about the press shaft 9, and the press roller 3 is pressed against the outer peripheral surface of the plate cylinder 1 with the printing paper sandwiched therebetween. The rotation of the drive plate 13 in the counterclockwise direction in FIG. 1 around the press shaft 9 is restricted, and the second link member 27 is further pulled up from this state, so that the second link member 27 is moved to the first position. Displacement with respect to the link member 23 causes the tension coil spring 35 to expand. As a result, the press roller 3 is pressed against the outer peripheral surface of the plate cylinder 1 with the printing paper sandwiched by the spring force due to the expansion of the tension coil spring 35, and the press pressure is determined by this spring force.

When adjusting the print density, the press pressure adjusting electric motor 57 is driven to rotate the drive gear 61. 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, so that the adjusting screw 33 has an axial direction with respect to the first link member 23. The position changes. As a result, the engaging 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, and this displacement changes the attachment length of the tension coil spring 35, and the attachment load of this. Changes.

Due to the change in the mounting load of the tension coil spring 35, the pressure for pressing the press roller 3 against the outer peripheral surface of the plate cylinder 1 under the above-described action, that is, the press pressure is changed, and accordingly the printing is performed. The concentration will change.

The driving of the adjusting screw 33 in the axial direction by the press pressure adjusting electric motor 57 as described above is performed by the meshing between the driving gear 61 and the outer teeth 50 of the nut member 49. The first link member 23 is composed of a spur gear having an axial length that is about the sum of the reciprocating stroke of the link member 23 and the maximum axial length of the adjusting screw 33. , The adjusting screw rotary gear 49 is kept meshed with the drive gear 61 as the first link member 23 is reciprocated by the press cam 47. Even if the first link member 23 is in any reciprocating position, it is slidably displaced along the tooth trace in the tooth width direction. The meshed state with the teeth 50 is maintained.

As a result, under any condition during the printing operation, the rotational power of the press pressure adjusting electric motor 57 is transmitted to the nut member 49, and the adjusting screw 33 moves in the axial direction to adjust the printing density. I will get it.

When the first link member 23 reciprocates by the press cam 47, the first link member 23 slightly moves laterally in FIG. 1 in addition to the pure linear reciprocating motion due to the pivotal connection mode of the press cam 47. The nut member 49 also slightly laterally moves in the left-right direction in FIG. 1, but the driving gear 61 is driven by the spring force of the torsion spring 63 in the meshing direction with the outer teeth 50 of the nut member 49. The meshing state between the gear 61 and the outer teeth 50 of the nut member 49 is maintained.

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

Since the adjusting screw 33 is not driven in the axial direction except when the print density is adjusted, the drive gear 61 may be disengaged from the meshing with the outer teeth 509 of the nut member 49. At this time, the solenoid 65 is energized. The solenoid 65 causes the motor mount plate 53 to rotate in the clockwise direction in FIG. 2 against the spring force of the torsion spring 63 around the pivot 55 with respect to the motor mount bracket 51, so that the drive gear 61 rotates. The engaging member 49 is forcibly disengaged by engaging with the outer teeth 50. By the disengagement of the outer teeth 50 of the nut member 49 and the drive gear 61 from each other, the tooth surfaces of the outer teeth 50 of the nut member 49 and the drive gear 61 are rubbed with each other as the first link member 23 reciprocates. The gears are retracted, the durability of these gears is improved, the power required for the reciprocating movement of the first link member 23 is reduced, and the press roller drive load is further reduced.

Incidentally, the forcible disengagement of the drive gear 61 as described above by the solenoid 65 is not always necessary in the press pressure adjusting apparatus according to the present invention, and this is as shown in FIG. It may be omitted.

[0034]

[Effect of device]

 As can be understood from the above description, according to the press pressure adjusting device of the printing device of the present invention, the outer teeth of the nut member and the driving gear are meshed with each other so as to be displaceable in the reciprocating direction of the first link member. Therefore, regardless of the reciprocating motion synchronized with the rotation of the plate cylinder of the press roller, the rotating power of the electric motor is transmitted to the nut member and the adjusting screw moves in the axial direction under any condition, and the electric motor is mounted on the fixed member Since it is separated by mass from the reciprocating drive system of the press roller, the mass of the reciprocating drive system of the press roller is reduced, and it can be operated during operation without impairing the original function of the press pressure adjusting device. Mechanical vibration and noise can be reduced, and high-speed operation of the printing device can be promoted.

[Brief description of 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 type stencil printing machine.

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

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

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

[Explanation of symbols]

 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 adjust screw 35 tension coil spring 39 cam lever 47 press cam 49 nut member 50 external tooth 57 Electric motor for press pressure adjustment 61 Drive gear 65 Solenoid

Claims (1)

[Scope of utility model registration request] 1. A press roller is movably supported by a press roller support member by a fixed side member, the press roller support member is pivotally connected to a first link member, and the first link member is a second member via a spring member. Connected with the link member,
The second link member reciprocates in the direction of separating and contacting the press roller with respect to the outer peripheral surface of the plate cylinder in synchronization with the rotation of the plate cylinder, so that the press roller together with the press roller support member is A press pressure adjusting device for a printing device, which is configured to move between a retracted position separated from an outer peripheral surface and a press acting position which is pressed against the outer peripheral surface of the plate cylinder by a spring force of the spring member. An adjusting screw that engages with the first link member so as to be movable in the axial direction and locks one end of the spring member to the first link member so that the mounting length can be changed; A gear-shaped nut member having teeth,
An electric motor arranged on the fixed side member, and a drive gear that is attached to the output shaft of the electric motor and meshes with the external teeth of the nut member to drive the nut member to rotate, and the external teeth of the nut member and the drive A press pressure adjusting device for a printing apparatus, wherein the gear and the gear are meshed with each other so as to be displaceable in the reciprocating direction of the first link member.