JPH0215644Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a safety device for a printing press.

Generally, in a printing press for sheet-fed printing, the rotation of a driving shaft rotationally driven by a motor is transmitted to a paper feeding mechanism section, a printing mechanism section, etc., and the end portion of the driving shaft is The attached handle wheel is manually rotated to adjust the timing of sheet delivery.

The handle wheel is usually located on the operator's side of the printing press, so when the handle wheel rotates together with the drive shaft during printing operations in which the drive shaft is rotated by a motor, there is a risk that clothing or the like may be caught. For this reason, a clutch is usually interposed between the drive shaft and a slidably provided handle wheel, but since the clutch is a dog clutch, when the drive shaft rotates, the handle wheel is pushed in the axial direction. , the clutch engages and the handle wheel rotates, creating a safety problem.

Therefore, this idea solves the above problems and
The purpose of this invention is to provide a safety device for a printing press that can reliably prevent the rotation of the driving shaft from being transmitted to the handle wheel attached to the end when the driving shaft is rotated by a motor. There is.

The configuration of this invention will be explained below based on the attached drawings.

As shown in the figure, a cylindrical portion 3 provided at the center of a handle wheel 2 is fitted on the outer side of the end of a driving shaft 1 which is rotationally driven by a motor, and this cylindrical portion 3 is fitted with a cylindrical portion 3 provided at the center of a handle wheel 2. It is supported by a bearing 4 and is rotatable and slidable in the axial direction.

Note that the handle wheel 2 is, for example, a driving shaft 1.
A snap spring is attached to the end of the handle wheel 2, or an engagement step is formed on the cylindrical portion of the handle wheel 2.
The engaging stepped portion is prevented from coming off by engaging with a stopper piece attached to the frame of the printing press.

A cylindrical clutch 5 is fitted onto the drive shaft 1 at a position inside the handle wheel 2, and is supported in an axially immovable and non-rotatable manner, and when the handle wheel 2 is pushed in the axial direction, , the engaging claws 6 formed on the end surface of the cylindrical portion 3 of the wheel 2 and the end surface of the clutch 5 engage with each other, so that the driving shaft 1 can be rotated by the rotation of the handle wheel 2. There is.

A bracket 8 is attached to the outer surface of the frame 7 of the printing press that supports the driving shaft 1, and two guide plates 9 supported by the bracket 8 actuate the brake plate 10.
is supported so that it can slide freely. Brake plate 10
can slide toward the outer periphery of the driving shaft 1, and by inserting a pin 12 standing up from the bracket 8 into a long hole 11 formed in the brake plate 10, the brake plate 1 can be slid.
When the brake plate 10 is moved toward the drive shaft 1 until it is restricted by the pin 12, the tip of the brake plate 10 touches the cylindrical portion 3 of the handle wheel 2 and the clutch 5. It is designed to enter between the corresponding end faces.

The brake plate 10 is pulled by a spring 13 and moves forward toward the outer periphery of the driving shaft 1.
When a plunger 16 of a solenoid 15 connected via a link 14 is energized, the solenoid moves backward.

The safety device according to this invention has the above structure, and when the drive shaft 1 is rotated in one direction by driving the motor, the tip of the brake plate 10 is connected to the cylindrical portion of the handle wheel 2. and clutch 5.

If the handle wheel 2 is accidentally pushed in the axial direction while the driving shaft 1 is rotating, the axial movement of the cylindrical portion 3 of the handle wheel 2 will be restricted by the tip of the brake plate 10. ,
The engaging pawl 6 is held in a disengaged state and can prevent the handle wheel 2 from rotating together with the drive shaft 1.

Also, when the rotation of the driving shaft 1 is stopped, the solenoid 1
5 to excite the plunger 16, the brake plate 10 retreats against the elasticity of the spring 13.
The brake plate 10 can be held at a position where the tip thereof is out of the area between the corresponding end surfaces of the cylindrical portion 3 and the clutch 5. Therefore, when the handle wheel 2 is pushed in the axial direction, the cylindrical portion 3 and the engaging pawl 6 of the clutch 5 engage with each other, and the drive shaft 1 can be rotated by operating the handle wheel 2.

As shown in FIG. 2, when the brake plate 10 is moved backward, the limit switch 17 supported by the bracket 8 is activated.
If the drive motor of the drive shaft 1 is stopped by a signal from the drive shaft 1, it is possible to prevent the drive shaft 1 from rotating while the engaging pawl 6 is engaged, thereby increasing safety. Can be done.

In the illustrated example, the plunger 16 of the solenoid 15 is energized to move the brake plate 10 backward, and the elastic force of the spring 13 moves the brake plate 10 forward.
The braking plate 10 may be moved forward by the excitation of the spring 13, and the braking plate 10 may be moved backward by the elasticity of the spring 13.

As described above, in this invention, the tip of the brake plate, which is slidably supported between the cylindrical part of the handle wheel and the clutch, is positioned, so that the handle wheel does not accidentally collide when the driving shaft rotates. Even if the handle wheel is pushed in the axial direction, the brake plate can restrict the axial movement of the handle wheel and hold the engaging pawl in a disengaged state, so that the rotation of the driving shaft is transmitted to the handle wheel. It is possible to reliably prevent this from occurring.

Furthermore, since the brake plate has a simple structure in which it is slid by the elasticity of a spring and the action of a solenoid, it is easy to assemble and can be easily incorporated into an existing printing machine.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the safety device according to this invention, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIG. 3 is a perspective view showing the main parts of the same as above. 1... Driving shaft, 2... Handle wheel, 3...
...Cylinder part, 5...Clutch, 6...Interlocking pawl, 1
0...Brake plate, 13...Spring, 15...Solenoid.

Claims (1)

[Scope of utility model registration request] A cylindrical part provided on the handle wheel is rotatably and slidably fitted to the outer periphery of the end of the driving shaft that is rotationally driven in one direction, and a non-contact member is fitted on the outside of the driving shaft at a position inside the cylindrical part. Engaging pawls are provided on the corresponding surfaces of the movable cylindrical clutch and the cylindrical portion, and the tip of the brake plate, which is slidably supported toward the outer periphery of the driving shaft, is moved in and out between the cylindrical portion and the corresponding end surfaces of the clutch. A safety device for a printing press that is equipped with a spring that moves the brake plate toward the outer periphery of the driving shaft, and a solenoid that moves the brake plate backward against the elasticity of the spring.