DE8109324U1 - Backlash-free gear drive for printing machines - Google Patents

Description

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The invention relates to a device according to the
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Drives for printing machines are particularly important
the freedom to play particularly carefully, there
Too much backlash is disadvantageous in the printed image
can knock down. Also in the design
of a gear for the spinning machine drive to be observed
that speüieii the rubber and plate cylinder with opening

dfuckmachines in their axles to DfUckzyÜndef vef- |

can be changed * A change in the axis spacing brings |

but also an increase in the tooth play, which j |

then leads to the known disadvantagesϊ 1

In order to eliminate these disadvantages, there are already various |

known devices * |

From GB-PS 177 529, for example, a toothed wheel is known which is derived from 1

two identical toothed disks are assembled, g

which are spring tensioned against each other- Also |

US-PS I.

1,334,517 and U.S. Patent 1,449,905. By virtue of the fact that the second j

associated gear resiliently against the direction of rotation i

is rotatably mounted, the unloaded |

Tooth flanks of the driven gear in mesh and thus |

backlash free. f-

However, these devices are not suitable for drives
that work at "high speeds", as torsional vibrations of the spring-loaded gears can occur. In order to

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the "strived for effect" is not guaranteed, so that These drives for high-speed machines are not Wendöt Wenden k-önneri,

A device has become known from DE- ^ dM 6 609 120, at def das BeilaUfe ^ fad And comb that with him de wheel has a different number of teeth and opposite its axis is äbbremsbäf.

The braking effect of the idler wheel creates a Full contact of the tooth flanks between the bypass gear and the driven gear ^ which also applies to torque fluctuations The flow of forces is not interrupted at high frequencies

However, the disadvantage of this device is * that the structural effort is relatively high and thus the device is expensivei

The object of the invention is therefore to create a small backlash-free gear drive that can be manufactured cheaply in its structure and not to interrupt the power flow even with torque fluctuations leads. Furthermore, the gear drive should remain backlash-free even when the center distance changes. Is resolved this object by a device according to the characterizing part of claim 1. By the type of configuration of the device, these can be manufactured in a compact and inexpensive manner. will. · -. "- ■ '-... · --.-

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As one example of the invention, the following is the following explained in more detail-

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found on average ₄
Fig. 2 and
Fig. 3 shows representations of the device before and after

assembly in a cutout *

In its simplest form, Dörr Kahnradtrieb has a driving gear 1 and a driven gear 2 arranged on tirieiT WeÜe 1jO. In order to make this gear drive backlash-free, cLlu switching off the backlash, the driving gear 1 is assigned a bypass gear 3. The auxiliary wheel 3 is resiliently arranged with respect to the drive wheel, seen in the circumferential direction, and also has the same number of teeth as the driving gear 1. Conical depressions 5, into which spring-loaded balls 6, which are resiliently provided in bores 7 of the driving gear 1, are made in the end face 4 of the auxiliary wheel 3 facing the driving gear 1. These bores 7 are offset in the circumferential direction with respect to the conical depressions 5 of the driving gear 1 with respect to the toothing. In the assembled state, the auxiliary wheel 3 is then pressed against a support disk 8 attached to the driving gear 1. If there are '' ¹ 'driving gear "1 and ^ idler gear 3 in mesh

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with the driven gear 2 _? so will dute-h the length-sprung spring elements 6 Un den; Z-Uf toothing offset tapered single serrations 5 shift the auxiliary thread 3 in the circumferential direction in such a way that the "2ahns'piei" existing between the driven gear 2 and the driving gear 1 can be compensated which eliminates the disadvantages of only resiliently braced gears against each other.

Zero backlash and friction damping also remain with one Center distance change received *

The small building construction is achieved in that the Beiläüferrad 3 is arranged on a shoulder 9 of the driving gear 1 and the support disc 8 on the driving Gear 1 is attached at the front. Since the space requirement of this drive is only slightly larger than that of one .normal gear drive, it can be better used for drives with limited space without additional effort.

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summary

On a backlash-free gear drive, the driving gear 1 has a shoulder 9 on which a bypass gear 3 is rotatable is attached. The auxiliary wheel 3 and the driving gear 1 have conical depressions 5 and bores 7, respectively. which are arranged on a common pitch circle opposite one another on the end faces 4, 4.1. Depressions and holes 7 are offset from the toothing. Spring elements 6 arranged in the bores 7 press this Bailer wheel 3 against a support disc 8 attached to the end of the shoulder 9 and try that at the same time Bailer wheel 3 in the circumferential direction with respect to the driving To turn gear 1.

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Claims (2)

ι t t ί f! f s e Il ■ · Γ · η «nn M. A. N. - ROLAND Druckmaschinen Aktiengesellschaft Christian-Pleß-Str. 6-30, 6050 Offenbach am Main 1.) Backlash-free gear drives, especially for printing machines, in which the driving gear is a coiler is resiliently assigned that the Backlash between the driving and the driven gear can be switched off, characterized in that the driving gear (1) and the auxiliary wheel (3) have the same number of teeth that the driving gear (1) has a shoulder (9) on which the auxiliary wheel (3) is rotatably arranged, that the driving gear (1) and the auxiliary wheel (3) on their facing end faces (4, 4.1) on a common pitch circle in a position in which the tooth flanks of the wheels (1, 3) are aligned, mutually defined in the circumferential direction Bores (7) arranged offset amount on the one hand or conical depressions (5) on the other hand have that in the bores (7) spring elements (6) are provided through which the pilot wheel (3) against a on the face of the shoulder (9) • · · · · Jt Λ * ΐ · * · f · f Γ · frr · i ¹ · rtf screwed support washer (8) is pressed on and through the offset of the holes (7) and the conical countersinks C6) a twisting of the idler gear C3) is achieved in the circumferential direction to the extent of the existing gear play. 2.) Gear drive according to claim 1, characterized in that the idler wheel (3) against the support disc (8) is pressed. 4 1 1141 * «i i * t ι « i fit * β hm