DE4006940A1 - Drive control for conveyor belt feed - with impulse generators on drive motor for accurate movement control - Google Patents

Abstract

The continuous drive belt system pulls the workpieces through the different process stages, while external elements move the workpieces to and from the belt, hold the items for processing etc. The accurate position control of the belt is derived from at least two impulse generators (DR1,DR2) coupled directly to the main drive motor. Only single position switches are required for each process stage. The main processor control operates using the impulse generator outputs as well as the position control signals to monitor the movement of the items. ADVANTAGE - Accurate position control, only requires half the usual position control switches i.e. only one from each conventional pair.

Description

The invention relates to a system controller according to the preamble of claim 1.

In such conveyor systems is known in Execution of the drag chain continuously revolving driven, with fixed driver pawls on this Chain in movable cams on the drives or Load slings intervene and thus the towing connect. In these known systems can now by stopper, runners and switches the load slings stopped, stacked, isolated  and brought to different destinations. The Control of these stoppers, switches and routes So far, this has always been done via limit switches or the like.

The disadvantage of this known type of control lies especially in the rather high construction costs, through which mostly abundance due to technical reasons switch u. Signalers as well as the compulsory commonly associated large amount of necessary Electrical installations.

Eliminate these disadvantages and control the system system in question easier, cheaper and above all with less The task is to make hardware costs more diverse of the present invention.

This task is solved in a surprisingly simple way Way by the specified in the claims Means and measures.

The accompanying drawing shows the control scheme in its new way.  

Basically, it can be seen first of all that the drive AN for the purpose of controlling individual movements such. B. travel between two stations, points, etc. at least one rotary encoder DR _{1 is} assigned. A particularly advantageous embodiment results from the arrangement shown of two mutually monitoring rotary encoders DR ₁ and DR ₂ with He incremental detection of the pulses directly on the drive AN and processing the same by the system control, with another innovation being the rotary encoders DR ₁ , DR ₂ can also serve as overload protection devices.

From the comparison of the full black filled triangular symbols with those on the drawing only dotted triangles can be seen that with a system control According to the invention, a good half of signal transmitters So limit switches, compared to the previously known Systems is saved. In addition, the control according to the registration also an exact ver following the individual load slings via an ent speaking screen.  

List of reference numbers

ON drive
SK drag chain
LL track
DR₁ rotary encoder
DR₂ rotary encoder
Limit switch
saved limit switches

Claims (3)

1. System control, primarily for a continuous and essentially horizontally circulating endless drag chain (SK) with a load hanger running rail (LL) underneath and corresponding load hanger consisting of two rail conveyor systems based on the Power + Free principle, characterized in that that the drive (AN) for the purpose of controlling individual movements such. B. travel between two stations, switch positions, etc. at least one rotary encoder (DR ₁ ) is assigned. 2. System control according to claim 1, characterized by the arrangement of two mutually monitoring rotary pulse generators (DR ₁ and DR ₂ ) with detection of the pulses incrementally directly on the drive (AN) and processing the same by the system control. 3. System control according to claims 1 and / or 2, characterized in that the rotary pulse encoder (DR ₁ , DR ₂ ) also serve as overload protection devices.