Joints and connections – Member ends joined by inserted section – Externally bridged
Patent
1994-08-25
1996-06-11
Knight, Anthony
Joints and connections
Member ends joined by inserted section
Externally bridged
403292, 101111, 101DIG48, B41J 120
Patent
active
055250041
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for fastening one end-part of at least one toothed belt-element to a machine element which has at least one slot through which one end-part of the belt-element is intended to be inserted and secured and the distance between the walls of which slot correspond generally to the thickness of the belt-element.
When fastening toothed belt-elements to a machine part, for instance to a slide which is intended to movably support a read head in printing equipment, the end-part of the belt-element has previously been secured to the slide by passing said end through a slot and then securing said end with the aid of a screw which is inserted through the slot and through a hole in the belt-element and then screwed into a threaded hole in the slide. This belt-securing technique requires the provision of a hole in the end of the belt and also the provision of a screw-threaded hole in the slide, and also requires manual tightening of the fastener screw.
An object of the present invention is to provide a simpler and quicker method of securing a toothed belt-element to a machine element without requiring the provision of additional fastener elements.
This object is achieved with a belt attachment device of the aforedescribed kind which is characterized in that at least one of the opposing walls of the slot has at least one gripping bar which projects into the slot and the cross-sectional shape of which corresponds generally to the cross-sectional shape of a tooth-space formed recess in the end-part of the belt-element. A slot of this configuration will enable the end-part of the toothed belt-element to be readily inserted into the slot from either side thereof, i.e. transversely to the length direction of the belt-element, such that the gripping bar or bars will be placed in or inserted in tooth-space formed recesses between the projections on the end-part of the belt-element, said projections having the form of rack teeth, so as to obtain a clamping fit between the belt-end and the slot walls. In this regard, at least one wall of the slot is conveniently formed by one side wall of a tongue-like leg which is configured to exert on the end-part of the belt-element inserted in the slot a clamping force directed which acts in a direction towards the other side of the slot. Furthermore, it is preferred that several gripping bars are disposed on the slot wall at a mutual distance apart which corresponds to the division or pitch of the toothed slots on the belt-element, so as to ensure that a strong and stable belt-element attachment will be ensured.
Each slot may be provided with abutment means for restricting lateral movement of the belt-element in the attachment device.
The invention will now be described in more detail with reference to the accompanying drawing, which is a side view illustrating a machine element having an inventive toothed belt attachment at each end of the machine element, prior to fitting the respective toothed belts together.
The illustrated machine element is a reciprocatingly movable slide 10 which is intended to carry a read head (not shown) in a printer unit. The slide 10 is driven by a toothed belt 12 which is connected at a location (not shown) with a broader belt-element 14 which has generally the form of a toothed belt and which, at the same time, forms a jalousie-like belt which is intended to cover a read gap for the read head in an inoperative, parking position of the slide 10. The belt 14 and the belt 12 thus form a closed loop with the slide 10.
In order to enable the belt 14 to be attached to the belt 12 quickly and simply without requiring additional fastener elements, the slide 10 is provided with a slot 16, 18 at each end of the slide. The slide 16 has a wall which is defined by a tongue-like leg 20, and an opposing wall which includes two gripping bars 22 which project into the slot 16. The spacing of the gripping bars 22 and their cross-sectional shapes correspond to the cross-sectional shapes and the pitch of the tooth interspaces 24 located bet
REFERENCES:
patent: 3638565 (1972-02-01), Drejza
patent: 3824654 (1974-07-01), Takabayashi
ICL System AB
Knight Anthony
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