US3734663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arming control for servo-adjusted tablet compressing machines
Assignee: Pharmacia and Upjohn Co
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Filing: 1971-11-16
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Granted: 1973-05-22
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Expires: 1991-11-16
Abstract
Abstract Compressing apparatus having die filling means adapted to fill a die with formable material, adjustable means for regulating the amount of formable material received in the die and force applying means for applying compressing force to the material within the die. Means are provided for measuring the force applied to the formable material within the die by the force applying means and producing a control signal which varies in proportion to said measured force which in turn indicates the degree to which the die was filled during a given compression operation. First switching means is provided which is responsive to the control signal and adapted to effect adjustment of the adjustable die filling means to control the weight and, therefore, the amount of formable material in each of the dies and thereby the force imparted to the formable material. A prearming circuit including second switching means is provided which is also responsive to the magnitude of said control signal to prevent the first switching means from being effective to effect adjustment of the adjustable die filling means during intervals of time when the magnitude of the signal is below the predefined threshold value.
Inventors
- 👤 J Holm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:03
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
163 words
In an apparatus having adjustable die filling means and a power supply therefor to effect an operation of said adjustable die filling means and means for measuring the force applied to formable material in said die by force applying means and for producing a control signal which varies in proportion to the magnitude of said measured force, a prearming circuit comprising: interpretive means responsive to the magnitude of said control signal and producing at least one output signal where the magnitude of said control signal is outside of a predefined range; first switching means responsive to said control signal and adapted to effect adjustment of said adjustable die filling means to thereby alter the force imparted to said formable material; and second switching means responsive to said output signal to prevent said first switching means from being effective to adjust said adjustable die filling means during intervals of time when said magnitude of said control signal is below a predefined activating threshold value.
Claim 2
Dependent Claim
163 words
In an apparatus having adjustable die filling means and a power supply therefor to effect an operation of said adjustable die filling means and means for measuring the force applied to formable material in said die by force applying means and for producing a control signal which varies in proportion to the magnitude of said measured force, a prearming circuit comprising: interpretive means responsive to the magnitude of said control signal and producing at least one output signal where the magnitude of said control signal is outside of a predefined range; first switching means responsive to said control signal and adapted to effect adjustment of said adjustable die filling means to thereby alter the force imparted to said formable material; and second switching means responsive to said output signal to prevent said first switching means from being effective to adjust said adjustable die filling means during intervals of time when said magnitude of said control signal is below a predefined activating threshold value.
Claim 3
Dependent Claim
103 words
A prearming circuit according to claim 1, wherein said first switching means comprises first and second switches adapted to become conductive or nonconductive in response to thE magnitude of said control signal, said first switch being conductive and said second switch being nonconductive when said magnitude of said control signal is not greater than a low predefined threshold value and said first switch being non-conductive and said second switch being conductive when said magnitude of said control signal is not less than a high predefined threshold value, said low predefined threshold value and said high predefined threshold value defining therebetween said predefined range.
Claim 4
Dependent Claim
82 words
A prearming circuit, according to claim 2, wherein said second switching means includes a silicon controlled rectifier wherein the gate electrode thereof is controlled as a function of the magnitude of said control signal and a relay switch having its winding connected in series with said silicon controlled rectifier is controlled by the conduction of said silicon controlled rectifier when the magnitude of said control signal applied to said gate electrode is in a predetermined relation to said predefined activating threshold value.
Claim 5
Dependent Claim
27 words
A prearming circuit according to claim 3, wherein the contact of said relay switch is in series with the conductive path controlled by said first switching means.
Claim 6
Dependent Claim
76 words
A prearming circuit according to claim 2 including further switching means in circuit with the power supply for said adjusting means to permit a manual control of the conductive state of said first and second switches and a normally closed switch in circuit with the power supply to the drive motor for said apparatus and time responsive means for opening said last named switch upon appearance of said output signal for a predetermined period of time.
Claim 7
Dependent Claim
48 words
A prearming circuit according to claim 1, wherein said output signal comprises a first output signal component when the magnitude of said control signal exceeds a predetermined minimum value and comprises a second output signal component when the magnitude of said control signal exceeds a predetermined maximum value.
Claim 8
Dependent Claim
21 words
A prearming circuit according to claim 2, wherein said predefined activating threshold value is less than said low predefined threshold value.
Claim 9
Dependent Claim
113 words
The prearming circuit according to claim 1, wherein said interpretative means produces two output signals, the first thereof being produced when the magnitude of said control signal is below said predetermined range and the second thereof being produced when the magnitude of said control signal is above said predetermined range and wherein further said first switching means is adapted to adjust said die filling means to increase the force imparted in response to said first output signal and to adjust said die filling means to decrease said force imparted in response to said second output signal and wherein said predefined activating threshold value is less than the lowest value in said predefined range.
Claim 10
Dependent Claim
48 words
A prearming circuit according to claim 1, wherein said apparatus is a tablet forming machine and wherein said formable material is a pharmaceutical compound and wherein said adjustable die filling means is adapted to control the volume of said pharmaceutical compound utilized to form same into a tablet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |