JPH0215643Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mounting structure for a handle wheel in 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 drive shaft is rotated by manual operation of the attached handle wheel to adjust the timing of sheet delivery.

Since the handle wheel is normally placed on the operator's side, if the handle wheel is mounted in such a way that it rotates together with the driving shaft during printing operations, there is a risk that clothes or the like may be caught in the handle wheel. For this reason, a clutch is usually interposed between the drive shaft and the handle wheel, but since the conventional clutch is a dog clutch, if the clutch is operated incorrectly when the drive shaft is rotating, the timing may be affected. If the timing is not correct, the rotation will be transmitted to the handle wheel, creating a dangerous situation; if the timing is not correct, the clutch may be insufficiently engaged, causing abnormal noises, or impact force may be applied to the engagement pawls, causing damage. There is the inconvenience of doing so.

Therefore, this invention eliminates the above-mentioned drawbacks and provides a handle wheel that can reliably prevent the rotation of the drive shaft from being transmitted to the handle wheel attached to the end when the drive shaft rotates. The purpose is to provide a mounting structure.

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

As shown in the figure, a cylindrical portion 3 formed in a handle wheel 2 is fitted onto the outer end of a driving shaft 1 which is rotationally driven by a motor, and is rotatably and slidably supported.

Here, the cylindrical portion 3 is supported by fitting a bushing 4 to the end of the driving shaft 1 so as to be slidable, and a bearing 5 between the bushing 4 and the cylindrical portion 3 of the handle wheel 2 fitted on the outside thereof. The bushing 4 is prevented from coming off by a snap spring 6 provided on the outer periphery of the end of the driving shaft 1. A radial hole 7 is formed at the end of the bush 4, and the ball 8 inserted into the hole 7 is pressed inward by the elasticity of a separation ring 9 attached to the outer periphery of the end of the bush 4. There is.

A first circumferential groove 10 and a second circumferential groove 11 are formed on the outer circumference of the driving shaft 1, and by fitting a part of the outer circumference of the ball 8 into one of the circumferential grooves, the axial direction of the handle wheel 2 is adjusted. The handle wheel 2 can be prevented from moving.
By pushing in the axial direction and fitting a part of the outer circumference of the ball 8 into the first circumferential groove 10, the centrifugal clutch 20 provided between the driving shaft 1 and the cylindrical portion 3 can be engaged. There is.

The centrifugal clutch 20 has a pawl support cylinder 21 fitted and fixed to the outer periphery of the driving shaft 1, and a clutch pawl 23 attached to a pair of support pieces 22 provided on the outer periphery of the support cylinder 21.
is slidably supported by a pin 24, and an engaging piece 25 is provided at one end of the clutch pawl 24 corresponding to the cylindrical part 3, and this engaging piece 25 is formed on the end surface of the cylindrical part 3. It is adapted to be attached to and detached from the engagement recess 26 in the axial direction.

The other end of the clutch pawl 23 is pressed outward by a spring 27 supported by the pawl support cylinder 21, and the inner end of the engagement piece 25 formed at one end It is in contact with the outer periphery.

The handle wheel mounting structure according to this invention has the above-mentioned configuration, and the handle wheel 2 is held in such a state that a part of the outer periphery of the ball 8 fits into the second circumferential groove 11 during the printing operation of the printing machine.

Now, when the drive shaft 1 is rotated with the ball 8 fitted in the second circumferential groove 11, the clutch pawl 23 supported by the pawl support cylinder 21 swings due to centrifugal force, and the engagement piece 2
5 moves outward, the handle wheel 2
Even if it is mistakenly pushed in the axial direction, the engagement piece 25 will not fit into the engagement recess 26 and the rotation of the driving shaft 1 will not be transmitted to the handle wheel 2.

In addition, if the drive motor for the drive shaft 1 is stopped after printing is finished, and the handle wheel 2 is accidentally pushed in the axial direction while the drive shaft 1 is rotating due to inertia, the The cylindrical portion 3 of the handle wheel 2 is placed inside the engaging piece 25 that is moving in the direction.
The inner end of the engagement piece 25, which moves inward as the rotational speed of the driving shaft 1 decreases, comes into contact with the outer periphery of the front end of the cylindrical portion 3, as shown in FIG.

Here, if the width of the inner end of the engagement piece 25 is made larger than the width of the outer end and the shape of the engagement recess 26 is regulated accordingly, the engagement piece 25 and the engagement recess 26 Even if they coincide during the rotation of the driving shaft 1, the engagement piece 25 does not fit into the engagement recess 26, and therefore, the engagement piece 25 has its inner end aligned with the cylindrical part 3.
Since the handle wheel 2 is held in contact with the outer periphery of the handle wheel 2, it is possible to prevent the handle wheel 2 from rotating together with the driving shaft 1.

In addition, a limit switch 28 is disposed in the sliding range of the tip of the cylindrical portion 3 where the amount of axial movement is limited by the engagement of the first circumferential groove 10 and the second circumferential groove 11 with the ball 8. If the limit 28 is activated to stop the driving motor of the driving shaft 1 when the centrifugal clutch 20 is pushed in the axial direction, the driving shaft 1 can be prevented from being rotated while the centrifugal clutch 20 is engaged. In addition, it is safe because if the handle wheel 2 is pushed in while the driving shaft 1 is rotating, the driving shaft immediately stops.

As mentioned above, this invention is a centrifugal clutch that is installed between the driving shaft and the cylindrical part of the handle wheel. However, the centrifugal clutch is held in a disengaged state to reliably prevent rotation of the driving shaft from being transmitted to the handle wheel. In addition, if the width of the inner end of the engaging piece of the clutch pawl that forms the centrifugal clutch is made larger than the width of the outer end, the tip of the cylindrical portion of the handle wheel may enter the inner end of the clutch pawl. Even if the rotational speed of the driving shaft decreases and the engagement piece moves inward, the engagement piece does not fit into the engagement recess and rotates while contacting the outer periphery of the cylindrical part, thereby reducing the impact force. This prevents damage to the clutch pawl, cylindrical portion, and the like.

Furthermore, since it has a simple configuration in which the centrifugal clutch is attached and detached by moving the cylindrical part of the handle wheel fitted to the end of the drive shaft in the axial direction, assembly is easy, and the motor stop switch can be attached to and removed from the cylindrical part. Since it can also be activated by moving the part in the axial direction, safety can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing the handle wheel mounting structure according to the invention, Fig. 2 is a longitudinal side view showing the above centrifugal clutch in a disengaged state, and Fig. 3 is an exploded perspective view of the above centrifugal clutch. It is. 1... Driving shaft, 2... Handle wheel, 3...
... Cylinder part, 20 ... Centrifugal clutch, 23 ... Clutch pawl, 25 ... Engagement piece, 26 ... Engagement recess, 27
……spring.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical portion provided on a handle wheel outside the end of a driving shaft that is rotatably driven in one direction is rotatable,
A centrifugal clutch is provided between the cylindrical portion and the driving shaft, and the centrifugal clutch has a clutch pawl slidably supported on the outer periphery of the driving shaft at a position inside the cylindrical portion. An engaging piece is provided at the end of the clutch pawl corresponding to the cylindrical portion, and a spring is provided to deflect the clutch pawl so that the engaging piece moves toward the outer periphery of the driving shaft. A mounting structure for a handle wheel in a printing press that has an engaging recess into which a mating piece can be inserted. 2. The engaging piece has both sides tapered so that the width of the inner end is larger than the width of the outer end, and the engaging recess into which the engaging piece can be inserted has a shape that fits the engaging piece. A mounting structure for a handle wheel in a printing press according to claim 1 of the utility model registration claim.