Control device for projector film stripping and threading mechanism
阅读：721发布：2022-12-18
专利汇可以提供Control device for projector film stripping and threading mechanism专利检索，专利查询，专利分析的服务。并且A self-threading motion picture projector includes a control device which latches a film stripping and threading mechanism of the projector in its active position wherein it is effective to feed film from a roll of film supported by the projector. When the leading end of the film has entered a film gate of the projector and has been engaged by a film-advancing member (which advances the film at a rate faster than the film stripping and threading mechanism), the control device is unlatched in response to the resulting tension of the film between the gate and the supply reel, thereby causing the stripping and threading mechanism to return to its inactive position so that the film can be projected. In the event the mechanism is moved to its active position when there is less than a minimum length of film on the supply reel (i.e., the film roll is of less than a minimum diameter), or if there is no supply reel on the projector, the control device will not latch the film stripping and threading mechanism in its active position.，下面是Control device for projector film stripping and threading mechanism专利的具体信息内容。
1. In a control device for apparatus having (1 ) means for supporting a supply roll of web material comprising an elongated strip of web material having a leading end, (2) a stripping and threading mechanism adjustable to an active condition for feeding the leading end of the web material from a supported supply roll of at least a predetermined diameter and to an inactive condition, (3) operating means movable to a first position and to a second position for adjusting the stripping and threading mechanism respectively to its inactive and active conditions, (4) resilient means for biasing said operating means toward said first position, and (5 ) means for releasably latching said operating means in said second position, the improvement comprising: detecting means for sensing the movement of said operating means beyond said second position towards said supporting means, thereby detecting the presence on said supporting means of a supply roll having less than said predetermined diameter or the absence on said supporting means of a supply roll; and means responsive to said detecting means for preventing said latching means from latching said operating means in said second position when said detecting means senses the movement of said operating means beyond said second position towards said support means.
2. The improvement defined in claim 1 further comprising means responsive to the feeding of the leading end of the web material from the supply roll for releasing said latching means.
3. The improvement as defined in claim 1 wherein: said latching means comprises a latching arm movable into engagement with said operating means in response to movement of said operating means from its first position toward said second position to block movement of said operating means to said first position; and said means responsive to said detecting means comprises means for preventing movement of said latching arm into engagement with said operating means when a supply roll of at least said predetermined diameter is not supported on said apparatus.
4. In a control device for a motion picture projector of the type having (1) means for supporting a film supply roll comprising an elongate strip of film having a leading end, (2) a stripping and threading mechanism adjustable to an active condition for feeding the leading end of the film from a supported supply roll of at least a predetermined diameter and to an inactive condition, (3) a rotating drive shaft, (4) a rotatable cam member, (5) clutch-operating means coupled to the shaft and to the cam member and movable between a first position and a second position for effecting rotation of said cam member by said drive shaft to predetermined initial and intermediate rotative locations corresponding respectively to said first and second positions of said clutch-operating means, (6) control means operated by said cam member for adjusting said strippIng and threading mechanism to said first condition in response to rotation of said cam member to said initial rotative location and to said second condition in response to rotation of said cam member to said intermediate rotative location, and (7) a latch member movable into operative latching engagement with said clutch-operating means at said second position thereof in response to rotation of said cam member from said initial rotative location toward said intermediate rotative location to releasably retain said clutch-operating means in said second position; the improvement comprising: detecting means for sensing the presence of a supply roll on said supporting means having less than said predetermined diameter and for sensing the absence on said supporting means of a film supply roll; and means responsive to said detecting means for preventing movement of said latch member into latching engagement with said clutch-operating means when said detecting means senses the presence of a supply roll having less than said predetermined diameter or when said detecting means senses the absence of a supply roll.
5. The improvement defined in claim 4 wherein said means for preventing movement of said latch member comprises means on said control means for blocking such movment of said latch member.
6. In a control device for apparatus having (1) means for supporting a supply roll of web material comprising an elongate strip of web material having a leading end, (2) a web stripping and threading mechanism movable between (a) first and second positions wherein the mechanism is ineffective to engage the supply roll to feed web material from the supply roll, and (b) each of a plurality of web feeding positions between its first and second positions wherein the mechanism is effective to engage the supply roll and feed the leading end of the web material from a web supply roll which may vary in size from a relatively small diameter roll to a relatively large diameter roll, (3) operating means movable between a first position and a second position for moving the mechanism between its first and second positions, and resilient means for urging said operating means toward its first position, the improvement comprising: latch means for releasably latching said operating means in at least one position between its first and second positions thereby to latch said stripping and threading mechanism in a web feeding position; and means coupled to said operating means and to said latch means and effective in response to movement of said operating means to its second position for preventing said latch means for latching.
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